My 05 (standard) shuts off, or maxes out, at 110. I know the car's capable of more than that, but how do I change it? Is this something the dealer can/would do with a little arm twisting?

My uncle has a 2002 Passat and we've been known to open them up once in a while on some rural roads around home. His shuts off around 110 as well, and I wanna be able to eak him out with this car. He got me so many times in my old Ranger (shut off at 95) and I seek revenge :D

... I highly doubt the dealer will accommodate the change due to possible 'legal issues' that could result should something happen as a result of the alteration ... I also doubt it will be an easy change because I suspect the G6 is somewhat like the Grand Am being the speed limiter is a function of the computer and unless you have a Tech3 you will not be able to access the relevant parameter ... for interest sake, changing the speed limiter in the Grand Am has only been accessible in the past couple years after a couple companies have now been able to reprogram the computer completely ... having said this, I would imagine someone will do this for the G6 eventually but not sure when :)

Mine stops at 110 as well. Has anyone with a GT or GTP tested the top end or know what it is? I'm guessing it is decently higher since both cars come with V-rated tires.

Mine stops at 110 as well. Has anyone with a GT or GTP tested the top end or know what it is? I'm guessing it is decently higher since both cars come with V-rated tires.

My GT tops out at about 135. That's nowhere near a V speed rating, but the engine stops there anyway. (It feels like a fuel cutoff that restarts when the speed drops back to 130.)

Your speed is computer limited, and is indeed based on the speed rating of the OEM tires.

To change your top end on the standard model, you'll need to have it changed in the computer. I doubt you're going to find a dealer that will mess with that because of the liability issues presented by our excessively litigious society.

If you wait long enough, hopefully someone will develop a chip or some type of device to reprogram the computer.

Mike

My GT tops out at about 135. That's nowhere near a V speed rating, but the engine stops there anyway. (It feels like a fuel cutoff that restarts when the speed drops back to 130.)

Your speed is computer limited, and is indeed based on the speed rating of the OEM tires.

To change your top end on the standard model, you'll need to have it changed in the computer. I doubt you're going to find a dealer that will mess with that because of the liability issues presented by our excessively litigious society.

WHAT! 135MPH????? ARE YOU GUYS 'INTERCOURSING' NUTS? of course, back in the 'good old days' i used to take my bosses '70 plymouth superbird out on I-75 in south florida and run 150mph with a bad u-joint and think nothing of it......all i was concerned with was beating the tar out of the vette next to me. in case you wanted to know, the mission was a success!!!

second thought, nevermind.....carry on!!!! just make sure you beat that jetta, wrx or whatever.....

Do these cars have a replaceable chip? My old Firebird was speed limited by the factory because of the tire rating. Replacing the chip from a bird with z tires would increase the speed. Not that I really want or need to go that quick, but as G6Action said, it used to be so much fun, 150 in my '70 GTO, taking 2 lanes because it felt like it weighed 50 lbs. Ahhhh, to be young and dumb again....

gezzz when do you ever need to go faster than 110MPH!!!! :rolleyes:

gezzz when do you ever need to go faster than 110MPH!!!! :rolleyes:

I cut my "speed teeth" in a '70 Charger RT (440, six-pack), followed by a Chevelle SS, so 135 in the G6 is pretty tame.

Western Kansas has a lot of really long, straight, smooth highways - if you can stay awake long enough to enjoy them.

There is a company called digital horsepower that reprograms the computers for Grand Prix's and I will see them next weekend. I will ask them if they are going to develop the same thing for the G6.

gezzz when do you ever need to go faster than 110MPH!!!! :rolleyes:

on the track of course!

Mike

I cut my "speed teeth" in a '70 Charger RT (440, six-pack), followed by a Chevelle SS, so 135 in the G6 is pretty tame.

Western Kansas has a lot of really long, straight, smooth highways - if you can stay awake long enough to enjoy them.

don't i long for those really long, straight, smooth highways (without cops!)........always great for 'feelin her out'. (70 Charger RT 440 six-pack? thats what the Superbird was, with a 4sp pistol-grip shifter..AWESOME) my first NEW car was a Mazda RX-2 w/rotary engine. i drove one NIGHT to the bowling alley (i was running a little late) on U.S. 31 and had it up to 110....IN THE RAIN!! now THAT was just being young and stupid....and probably BEFORE speed-rated tires!!!!!

holy cow, batman!!!!

(70 Charger RT 440 six-pack? thats what the Superbird was, with a 4sp pistol-grip shifter..AWESOME) my first NEW car was a Mazda RX-2 w/rotary engine. ....and probably BEFORE speed-rated tires!!!!!



Speed rated tires? Only in our young, impetuous dreams.

Man, the Chargers, Challengers, Daytonas, and Suberbirds were rolling on bias-ply 'glass tires!

I guess, looking back, that we WERE nuts.

on the track of course!

Mike

Yeah, we've got a really nice track out here.

It's called I-70!

When you get out of the city heading west, every few miles you'll hit a straight stretch that's about two miles long - straight as an arrow with a clean line of sight. (if you look hard enough on a clear day, sometimes you can see Colorado)

Ah, Kansas - flatter than a pancake. And fewer state troopers per mile of highway than most other states in the union.

gezzz when do you ever need to go faster than 110MPH!!!! :rolleyes:
Since its been a long time since Ive been to 170+mph.. I get the itch frequently. There is never really A NEED. :D

Strange that the GT or GTP would have a fuel cut when the V6 just sits against the 110 mark (Throttle by wire was supposed to elimanate the fuel cut I thought). Im sure they are very close to getting rid of those limitations. I will talk to my friend at HPtuners and see if they have worked on anything.


If you guys want to experience something insane...go find an LT1 Camaro or firebird equiped with 2:73 gears or without the QFZ/QTZ tire package and try to top it out. At 120mph you will suddenly get JERKED from your seat as the throttle is cut and brakes applied instantaneously. I dropped 10mph in a split second while running a 03 mustang GT into the tripples (so he was a ways back..I just wanted to rub it in :p ).

[QUOTE=otcpharm]My GT tops out at about 135. That's nowhere near a V speed rating, but the engine stops there anyway. (It feels like a fuel cutoff that restarts when the speed drops back to 130.)
QUOTE]

I'm a little curious now. Did it feel like there was still room to go or was it pretty much topped out by then? H's are around 130 I think? So the V's make sense.

I could tell you right now will only 200hp and the aeros we have... your going to top around 135~140mph... The "invisible wall" will definately be stopping you from getting much further.

At 110 my G just feels like that's all it has....doesn't shut off and sound like it's dying for air, the way my Ranger used to do. That thing would shut down similar to the way the Camaro was referenced doing, without the braking. Then about 85, it'd find new life.

110 is fun, but I really want 115 or 120. Just once, maybe twice a year. Is that too much to ask :D

The reason it sits at 110 is the computer has direct throttle control (since the pedal is simply an electric switch). On older cars (and the camaro) a physical connection from the pedal to the throttle body prevents the computer from limiting your speed like that.

I'm a little curious now. Did it feel like there was still room to go or was it pretty much topped out by then? H's are around 130 I think? So the V's make sense.

No, it didn't feel like it had much left. From 130 to 135 seemed to take forever - it just creeped slowly up.

And S8ER99 is correct in that our relatively limited HP doesn't allow us to go much past 135 anyway.

yeah...I was thinking back to the mustang and its 215hp... it was topped out just shy of 140..with NOTHING left.....

Yeah, we've got a really nice track out here.

It's called I-70!

When you get out of the city heading west, every few miles you'll hit a straight stretch that's about two miles long - straight as an arrow with a clean line of sight. (if you look hard enough on a clear day, sometimes you can see Colorado)

Ah, Kansas - flatter than a pancake. And fewer state troopers per mile of highway than most other states in the union.

we've got an "I-70" Raceway here in indy too. down side is that you tend to get 'red flagged' alot by the 'officials' and they tend to fine you and ADD points....not good. but hey, we sometimes just have to 'go with the flow'...

we've got an "I-70" Raceway here in indy too. down side is that you tend to get 'red flagged' alot by the 'officials' and they tend to fine you and ADD points....not good. but hey, we sometimes just have to 'go with the flow'...

I like 465 better :) ITs even shaped like a race track.

We have a bridge we call the I-100... Its actually I-80 but every morning we would leave the Iowa ramp WOT until we hit 120~130mph and were slowing down for the other ramp just acrossed the river. :D

Speed limiters are simple. Depending on the vehicle. Some cars you can snip a wire, others you need an FCD (Fuel Cut Defenser) which is more commonly used on forced induction vehicles. But simply by eliminating the signal of excessive speed to the ECU can we eliminate speed restrictions. Not necessarily removing your speed sensor because of course you need that. I am in the process sometime this week in locating a wire diagram, and an ECU layout to see where exactly I can make this "snip" So you will all be informed when I find out, because im not about to be doing 135+ and have my car shut off.
jeff

It takes a while to get there... so its not a big issue once you get to it. Chances are your acceleration will be slow enough you might not even notice it for a few moments.

Speed limiters are simple. Depending on the vehicle. Some cars you can snip a wire, others you need an FCD (Fuel Cut Defenser) which is more commonly used on forced induction vehicles. But simply by eliminating the signal of excessive speed to the ECU can we eliminate speed restrictions. Not necessarily removing your speed sensor because of course you need that. I am in the process sometime this week in locating a wire diagram, and an ECU layout to see where exactly I can make this "snip" So you will all be informed when I find out, because im not about to be doing 135+ and have my car shut off.
jeff
Good luck. I'm not to optimistic on this solution. There is no input into the PCM that tells it when to activate the governor, it uses inputs and decides when to activate it. There is no wire you can simply snip without affecting a great many things.

why not just get a programmer and change it? might be expensive but sure beats trying to explain to ur dealer how a wire got snipped when u need the job warrentied lol

all depends on the PCM, inputs and outputs. Ill know for sure when I look into it,
jeff

why not just get a programmer and change it? might be expensive but sure beats trying to explain to ur dealer how a wire got snipped when u need the job warrentied lol
Because there is currently no programers avalable for the G6



all depends on the PCM, inputs and outputs. Ill know for sure when I look into it,
jeff
I can tell you right now that there is no input into the PCM strictly for the governor. Its part of the PCM program, it takes inputs from the speed sensor, tac sig, trans gear, ect. and determines when its reaching injector cutoff. the govenor is just an extention of torque abuse.

Because there is currently no programers avalable for the G6




I can tell you right now that there is no input into the PCM strictly for the governor. Its part of the PCM program, it takes inputs from the speed sensor, tac sig, trans gear, ect. and determines when its reaching injector cutoff. the govenor is just an extention of torque abuse.

regaurdless a signal is sent from the PCM the PCM alone does not make the cars governor kick in, even if its internally within the PCM that compononent has some sort of length of travel to make to another component to the tell the vehicle to give fuel-cut.
jeff

regaurdless a signal is sent from the PCM the PCM alone does not make the cars governor kick in, even if its internally within the PCM that compononent has some sort of length of travel to make to another component to the tell the vehicle to give fuel-cut.
jeff

I think you're going to be disappointed when you start to tear into this.

The G6 doesn't follow any of the rules that we've come to expect from any other GM product out there.

regaurdless a signal is sent from the PCM the PCM alone does not make the cars governor kick in, even if its internally within the PCM that compononent has some sort of length of travel to make to another component to the tell the vehicle to give fuel-cut.
jeff
Actualy it does. I've explained it the best I can, I think you're going to find this out soon enough.

Yeah, I don't think there is going to be some "snip" to remove any governer. I think Blackrider is correct, the vehicle simply uses existing sensors and the computer is programmed to not allow the car to exceed a certain speed. Pretty sure most modern cars are like this.This might be incorrect, but I would be VERY, VERY surprised if there was dedicated wiring for some sort of speed limiting feature.

im not saying its going to be necessarily a snip. But it is going to be accomplished, I have found two companies so far who build PCM upgrades for GM vehicles and I have emailed both of them regaurding our vehicle for higher perameters on all levels, and to include...no fuel cut. so I am just waiting for a response, and if they dont want to build one or whatever, im just going to buy one cause they only cost $400 from sites I have seen I will send it in for a custom job. Depending of course if they need to operate on the same level as the BCM and ingnition system like the 01+ grandams, so I would have to take mine out and send it to them.
jeff

im not saying its going to be necessarily a snip. But it is going to be accomplished, I have found two companies so far who build PCM upgrades for GM vehicles and I have emailed both of them regaurding our vehicle for higher perameters on all levels, and to include...no fuel cut. so I am just waiting for a response, and if they dont want to build one or whatever, im just going to buy one cause they only cost $400 from sites I have seen I will send it in for a custom job. Depending of course if they need to operate on the same level as the BCM and ingnition system like the 01+ grandams, so I would have to take mine out and send it to them.
jeff
I never said it was impossible, I just said there was no physical way you can do it. DHP removes the Governors in all their entry level PCM's

Its all programing!

As I said DHP is working on PCM's for the G6.

Technically we do not even have a 'fuel cut'... the car just sits against the set parameters from the PCM tables... Just a programming issue...chances are its just using the vehicles speed sensor (same feed as the speedo).

Double check on this but some of GM's vehicles the VSS or vehicle speed sense wire is Green/White located at several points in the vehicle. It should be at the instrument panel for the speedo, behind the radio for speed controlled volume, and apparently at the PCM or Powertrain control module. You maybe able just to cut it and put a hidden overide switch near the PCM to remove the speed signal from the PCM and still retain your speedometer. If this car is equipped with the class II data bus system which it should be (you can tell if the door chime comes from the left front speaker) the speed pulse maybe carried down the Purple/White or data wire at the OBD II connector. If that is the case you may be SOL.

Double check on this but some of GM's vehicles the VSS or vehicle speed sense wire is Green/White located at several points in the vehicle. It should be at the instrument panel for the speedo, behind the radio for speed controlled volume, and apparently at the PCM or Powertrain control module. You maybe able just to cut it and put a hidden overide switch near the PCM to remove the speed signal from the PCM and still retain your speedometer. If this car is equipped with the class II data bus system which it should be (you can tell if the door chime comes from the left front speaker) the speed pulse maybe carried down the Purple/White or data wire at the OBD II connector. If that is the case you may be SOL.
But thats what i'm saying the PCM NEEDS to know the speed of the car such things as the tranny use that input.

If this car is equipped with the class II data bus system which it should be (you can tell if the door chime comes from the left front speaker) the speed pulse maybe carried down the Purple/White or data wire at the OBD II connector. If that is the case you may be SOL.

Actually, you can tell if this car is OBDII by checking the year it was built. If it was built after 1996, then it's OBDII.

However, they jumped in early and implemented the newer CAN bus protocol (to be mandatory by 2008). New hardware and software required to do diagnostics on CAN, so I wouldn't be too quick to try to apply things that worked on older models.

But thats what i'm saying the PCM NEEDS to know the speed of the car such things as the tranny use that input.
Very good point. I know on my Z shift points were all controlled by MPH and not RPM or any other variable. If that was the case you may also risk sending the PCM 0 MPH and having it dump into first gear. (doubtful..but possible in theory)

Very good point. I know on my Z shift points were all controlled by MPH and not RPM or any other variable. If that was the case you may also risk sending the PCM 0 MPH and having it dump into first gear. (doubtful..but possible in theory)
I'm pretty sure it needs both, I know on GM's it does anyways. Nissan might have a different system.

I did my own tuning ;) I won't claim all GMs do..but I know my car calculated by MPH only.

Note: I noticed you said Nissan.. .blah..I wouldn't own a nissan product... Z = Z28 (Must be an Fbody owner thing... thats what is used everywhere Ive been fwiw)

i wouldn't be worried about speed limiters anyways. if you can't hit it in the quarter mile, you don't need to worry.

once you hit the limit running the 1320, THEN worry about speed limiters...

(no direct offense implied, but what's the point?)

I did my own tuning ;) I won't claim all GMs do..but I know my car calculated by MPH only.

Note: I noticed you said Nissan.. .blah..I wouldn't own a nissan product... Z = Z28 (Must be an Fbody owner thing... thats what is used everywhere Ive been fwiw)
Ahhh Gotch ya, Yeah I did all my own tuning on the Grand Am Via the PowrTuner and it used both MPH and RPM, witch made it a pain in the ass to set shiftpoints.
What year was you're "Z"?

1995 (OBDI Thank god).

:)

i wouldn't be worried about speed limiters anyways. if you can't hit it in the quarter mile, you don't need to worry.

once you hit the limit running the 1320, THEN worry about speed limiters...

(no direct offense implied, but what's the point?)

auto X track applications

auto X track applications
Where do you autoX and hit above 130mph? Just about every track I've seen has a top speed of 45.

Unless you are modding heavily I dont see that being a problem. A Z06 can hit those speeds on a few straightaways (roadcourse) otherwise..not gonna be a problem.

Where do you autoX and hit above 130mph? Just about every track I've seen has a top speed of 45.
45mph? on the track?! im used to watkins glen in NY. And theres some tracks down here in florida and alabama others get up to 110 on with less HP. And I would like to do some SCCA club races eventually whenever I get time. Military does not permit time that often.
jeff

and as stated above I do alot of interstate travel from panhandle to tampa, or to tallahassee, or NC or NY. So my speed travels are way above this cars governor. I used to set my BMW cruise at 138MPH (please dont lecture me, im not a kid. My actions are just that, mine.)
jeff

45mph? on the track?! im used to watkins glen in NY. And theres some tracks down here in florida and alabama others get up to 110 on with less HP. And I would like to do some SCCA club races eventually whenever I get time. Military does not permit time that often.
I've never had the luxury of a speedway before. Most autoXs around here are short courses in parking lots and such. Lots of turns and short straights. I still don't think the G6 would make a good autoX car. I'm not at all impressed with the suspension or handling. There aren't many parts available yet, and when they do become available, they'll cost a grip. I'd think you'd have better luck and more fun with your BMW.
Good luck to you though.

As far as the highway arguments... don't worry I completely understand...as someone who almost daily visited 150+mph... I get rather frustrated running the 10 mile stretch home stuck against my 110mph limiter. :(

i see now. most people just want to so they can go faster, but if you'll actually get to those speeds on the track, then more power to you.

i think the G6 will be a great track car once proper suspension components are available.

i've regularly hit some pretty fast speeds in the Red Line, but i'd be wary of speeds that high in this car without the proper rubber...

i've regularly hit some pretty fast speeds in the Red Line, but i'd be wary of speeds that high in this car without the proper rubber...

No problems with the rubber on the GT, other than the quality. The GT can't even hope to reach the rated max for the OEM tires (W rated). Without mods, it'll run out of steam before it even reaches the limit of V-rated tires. When I hit the limiter, it was still accelerating, but v e r y slowly.

No problems with the rubber on the GT, other than the quality. The GT can't even hope to reach the rated max for the OEM tires (W rated). Without mods, it'll run out of steam before it even reaches the limit of V-rated tires. When I hit the limiter, it was still accelerating, but v e r y slowly.

if it's that slow to reach the limiter, is it really necessary to want a raised limiter for a road track?

i doubt it...

edit: i think the G6 (GT w/3500) is the wrong car for this guy, and a track oriented vehicle would have been better for him.

Oh its definately the wrong car. it would be nice to see once setup with nice suspension, brakes, etc...Gm could have made a BMWish handling car here if they tried.

Oh its definately the wrong car. it would be nice to see once setup with nice suspension, brakes, etc...Gm could have made a BMWish handling car here if they tried.

all they need to do is take the time to tune the suspension like they did the Cobalt SS/Ion Redline, and they'd have a serious road car (plus LOTS more power). you would hope the GTP solves that though.

it's just a shame to see someone try and turn an auto G6 into a track car, when there are sooo many more viable options for the money...

I see soo many people try to do the same thing with a 100hp import so seeing someone do it with a domestic car is actually refreshing. *scary thought isn't it?*

I see soo many people try to do the same thing with a 100hp import so seeing someone do it with a domestic car is actually refreshing. *scary thought isn't it?*

i hear ya, but it's one thing to do it with a car you just spent a grand or two on, and quite another to do so with a 20k+ car given the available alternatives...


Spoolin' - nothing against your decision, as it's a nice car, just not quite the direction i'd personally go with it. please keep us updated on your progress!

i hear ya, but it's one thing to do it with a car you just spent a grand or two on, and quite another to do so with a 20k+ car given the available alternatives...


Spoolin' - nothing against your decision, as it's a nice car, just not quite the direction i'd personally go with it. please keep us updated on your progress!

most understandable. I just like to see what the car can do. beleive me its not the best decision haha. the BMW was built for it and held pretty good and i am getting rid of it on saturday i think, depending on buyer.

As for the engine slowing down. I beleive it co-insides with the PCM determining torque overload as stated before. So the computer may be noticing we are close and giving us bits and peices because ive experimented and power does not drop as fast as mine did. no steady loss in power. So im going to throw down that it can obtain better speeds with stock power, but not as quick as wanted.

most understandable. I just like to see what the car can do. beleive me its not the best decision haha. the BMW was built for it and held pretty good and i am getting rid of it on saturday i think, depending on buyer.

As for the engine slowing down. I beleive it co-insides with the PCM determining torque overload as stated before. So the computer may be noticing we are close and giving us bits and peices because ive experimented and power does not drop as fast as mine did. no steady loss in power. So im going to throw down that it can obtain better speeds with stock power, but not as quick as wanted.

you need to get that supercharger kit...

hey old guys im 19 young and dumb and my dad has a hyabusa... for those of yall who dont know what that is it is a 1300cc rocket with wheels stock with 150hp or so he has some extras bout 180 now dyno tested and it weighs bout 500lbs with me on it so 185mph in 5th gear 10k rpm 12k rev limiter and 6 spd trans... but just got me an 05 g6 gt (love my slapstick get a few more rpm) and it felt like it stopped at 125mph

ill probably be taking my gxp out to homestead to race around in the road course and sometimes the oval. Im sure i can hit the limiter on the oval for sure....so far ive hit 130 and it road pretty smooth

Highest I've had my 08' GT sedan is 116 mph, won't go any higher. Kind of dissapointing since my GA GT would get up to around 130. Hell, I had a 99 Grand Am SE 4 cyl. that I got over 120 all stock.

Jet performance already has a chip with 2 levels. I am under the impression that it vuts off the speed limiter along with other sweet upgrades. But the only thing is that for the level 2 you need a catback and a 180 degree thermostat

Mines topped of at 130mph going against an infiniti g35 try turning of your traction control.

My 05 (standard) shuts off, or maxes out, at 110. I know the car's capable of more than that, but how do I change it? Is this something the dealer can/would do with a little arm twisting?

My uncle has a 2002 Passat and we've been known to open them up once in a while on some rural roads around home. His shuts off around 110 as well, and I wanna be able to eak him out with this car. He got me so many times in my old Ranger (shut off at 95) and I seek revenge :D

The best bet would wait and research to see if superchips or diablo someone like that will make a prgrammer for the g6. I have a superchips for the gto and it raises the limiter to 250mph. Ill never reach that will all the mods in the world. Good luck.

Does any one make a programmer for the 07 Convertible with the 3.9L??

I don't mean to dig up old posts, but I hit the limiter in my 2008 G6 GXP, it's 116mph, I thought I bought a sports car not a pos, my mazda3 could hit 125mph, although it was out of breath at that speed, at 116mph my G6 goes into some sort of weird setting that feels like it's shut off some of the cylinders on the engine or something, and it's in 5th up until that point and then it hits 6th and does that, It should do 150mph at least.

Jet performance already has a chip with 2 levels. I am under the impression that it vuts off the speed limiter along with other sweet upgrades. But the only thing is that for the level 2 you need a catback and a 180 degree thermostat

just saw this post as well, does anyone make a chip for the GXP?

1

Another thought just popped into my head, what about a programmer rather than a chip, or is the ECM un-reprogrammable?

You have a tune though, right? Most any tuner get's rid of the limiter...155, that's hot!

You have a tune though, right? Most any tuner get's rid of the limiter...155, that's hot!

huh?

$100 for a hp tuner license I can remove the speed limit no problem. All my vehicles have been reset to max speed 255

i have a stock g6 gt 07 4door in i did 135mph in it on interstate driving semi u dont need the 4th gear u can get to it in 3rd

[QUOTE=macmacG6;21301]i have a stock g6 gt 07 4door in i did 135mph in it on interstate driving semi u dont need the 4th gear u can get to it in 3rd[/QUOTE

Mine stops at 110 as well. Has anyone with a GT or GTP tested the top end or know what it is? I'm guessing it is decently higher since both cars come with V-rated tires.

Just put in a Throttle Body Spacer and you will see the difference that is all I'm going to say.

GM tells me that the speed limiter is in place for the the tires that come with my G6, but will not change the speed limit for me if I go buy a higher speed rated tire. They threaten to void my warranty if I change anything. Is this fair? Oh, and can someone tell me where the speed limiter is mentioned in GM's sales/specs/owners manuals?

GM tells me that the speed limiter is in place for the the tires that come with my G6, but will not change the speed limit for me if I go buy a higher speed rated tire. They threaten to void my warranty if I change anything. Is this fair? Oh, and can someone tell me where the speed limiter is mentioned in GM's sales/specs/owners manuals?

Just to let you know the no company will put a limiter limit on their website or sticker. The fastest you can go in the states is 75 plus it is a federal regulation that all engines have a percentange of the top rated speed of that engine.

Just to let you know the no company will put a limiter limit on their website or sticker. The fastest you can go in the states is 75 plus it is a federal regulation that all engines have a 75% top rated speed of that engine.


So is that fair to the consumer? Doesn't the consumer have the right to know 'everything' about their many thousand dollar purchase? I cannot find this regulation that you mention anywhere in either the U.S. or Canadian government materials. Closest thing I can find relates to heavy trucks and fleet vehicles. Can you provide it for us?
Oh, I have a Nissan Altima that does every bit of 136 and a Jeep Cherokee that does every bit of 130...that's 100% of their speeds showing on the dials....go figure.

So is that fair to the consumer? Doesn't the consumer have the right to know 'everything' about their many thousand dollar purchase? I cannot find this regulation that you mention anywhere in either the U.S. or Canadian government materials. Closest thing I can find relates to heavy trucks and fleet vehicles. Can you provide it for us?
Oh, I have a Nissan Altima that does every bit of 136 and a Jeep Cherokee that does every bit of 130...that's 100% of their speeds showing on the dials....go figure.

I will when I get back. Of course. I had a 2000 Explorer that read 120 and I buried the needle. So It is really up to the maker on what they want to put. Do you want to buy a Ferrari that says 80 or 185 on the speedometer. So it doesn't mean it is 100% of that engine.
Governor (device)
Automobiles are a common application, and modern automobiles are equipped with such a mechanism for various reasons. There are two types of automobile governors, one limiting the rotational speed of the engine, the other limiting the speed of the vehicle. In small, low power applications, governors are used to protect the engine from damage due to excessive rotational speed, or pushing the engine past its peak abilities. In larger, higher performance engines governors are used to limit the vehicle speed. Many performance cars are limited to a speed of 250 km/h (155 mph)[2] to limit insurance costs of the vehicle and reduce the risk of tires (tyres) failing.

http://www.itsdocs.fhwa.dot.gov/JPODOCS/REPTS_TE/8183.pdf This talks about commercial and Privately Own Vehicles. You will have to read it. I gave you site

I will when I get back. Of course. I had a 2000 Explorer that read 120 and I buried the needle. So It is really up to the maker on what they want to put. Do you want to buy a Ferrari that says 80 or 185 on the speedometer. So it doesn't mean it is 100% of that engine.
Governor (device)

If it is up to the maker, the maker should place the speed they limit the engine to and only that speed as the maximum number on the speedometer or at least place this info in the owner manuals or specs materials so that the buyer can make a 'fully informed' choice.

Imagine if you were in a life or death situation and you find out later that you could have gotten to a hospital faster by taking another vehicle. I think that anyone in such a situation would choose the vehicle that goes faster. I've been in that situation and I was pretty upset about it. Not everyone has a choice of cars to rush to the hosptial in....but I would have chose my Jeep instead of my G6 that day...if I had known.



Automobiles are a common application, and modern automobiles are equipped with such a mechanism for various reasons. There are two types of automobile governors, one limiting the rotational speed of the engine, the other limiting the speed of the vehicle. In small, low power applications, governors are used to protect the engine from damage due to excessive rotational speed, or pushing the engine past its peak abilities. In larger, higher performance engines governors are used to limit the vehicle speed. Many performance cars are limited to a speed of 250 km/h (155 mph)[2] to limit insurance costs of the vehicle and reduce the risk of tires (tyres) failing.

http://www.itsdocs.fhwa.dot.gov/JPODOCS/REPTS_TE/8183.pdf This talks about commercial and Privately Own Vehicles. You will have to read it. I gave you site

I already found this report and that is all it is...just a report.
Page three in this report states, "The report describes devices available to control truck speed, and ways that they are applied in commercial fleet settings. The report is supportive of fleet applications of speedmonitoring
and speed-limiting devices, but concludes that there is not sufficient justification to consider requiring all heavy trucks to be so equipped. Problem size statistics suggest that the number of target crashes is low, e.g., approximately 30 fatal crash involvements per year for combination-unit trucks. This small crash problem size, together with uncertainties regarding the potential for crash reduction, suggest that the benefits of mandatory speed limitation are questionable."

GM can't even provide me with the so-called 'regulation'...or at least they're still looking for it...over two weeks for me now...still no word from them...

It's just my opinion, but I think with the technology that they have today the car makers would be better off building in controls that let the owners themselves set the limit of their vehicles, especially the parent who allows their kids to drive their vehicle.
If someone wants to go fast, let them do so at their own risk. The limiters are set at excessively high amounts already.
If they're so concerned about safety and the speeds at which people 'might' drive, why not set all vehicles to do the maximum of any road in the country - 75. I'm kdding there of course, but it still makes a point. hehe.

Thank you BigBooDaddy for taking the time on this.

My 2005 G6 GT Model was able to go up to 200 km/h, i know it can go more but the engines computer (ECM) is controlling it to not go anymore due to your tires speed rating, so if you do get your G6 to go faster its possible jsut make sure you have the proper tires to handle speeds higher than 200. if you want you can still use your same tires jsut be carefull when pushing your G6 at higher speeds, but its still best to look into it. Here is a couple of links to companys who sell a new ECU that takes of the top speed limiter and rev limiter, you can either send in your ecu or you can buy one brand new, you just need to send you V.I.N. number in and fill the rest of the info and options.
>>>>> http://www.zzperformance.com/g6/products.php?id=148 <<<<< >>>>> http://www.whiteautoandmedia.com/index.php?page=shop.product_details&flypage=flypage.tpl&product_id=38&category_id=17&option=com_virtuemart&Itemid=54&vmcchk=1&Itemid=54 <<<<<try this site first. if it doesnt work then just go to the main page www.whiteautoandmedia.com

I purchased a 2009 G6 GT and found that it will only top out at 110. I have not read all the other posts but it looks like there is no way for it to go faster. Any thoughts or recomendations?

Besides the speed issue it handles great!

I purchased a 2009 G6 GT and found that it will only top out at 110. I have not read all the other posts but it looks like there is no way for it to go faster. Any thoughts or recomendations?

Besides the speed issue it handles great!

Yes our tune can handle that for you in addition to more power and increased fuel economy :)

Is it a chip? I dont know a whole lot about tuning but thanks for the tip. What kinda performance can I expect from the tuning and will it allow me to go beyond the 110 mph threshold?

I have the WAMS BAM THANK YOU MAM tune (http://www.whiteautoandmedia.com/)that Chris does.
I felt a nice difference but dont expect an increase in gas milage.

It makes you have a lead foot which is counterproductive to that goal. lol

I have an o7 v6 g6 that has a max of like 105 if i buy one of these chips is it going to allow me to go faster? and is it better to buy a new ecm outright and pay the extra to keep the original or not?

Hello people...been a while since I was here.

Since then GM got back to me about speed limiters and all they wanted to do was give me technical reasons for why they had them in place. They admitted there was no 'real' legislation, but they do it for 'ours and the automobiles protection'. They took my suggestion to include the speed limiters in either their specs/sales material. I'm sure they'll sleep on it, but what the heck.

I started asking around and a some local mechanics suggested that the speed limiters on ALL Pontiacs can be in a way 'turned off' without modification by both turning off the traction control AND by pulling up one notch on the hand brake. They said one notch will not engage the brakes, that it will just trip the alarm at that level and in turn disable the speed limiter controls. They told me that you will be annoyed by the ringing door chime sound and the clock interface flashing and the lights will/may turn off, but the car should reach its maximum if you want it to like this. I haven't tried this yet because it is winter here right now, but I will when it warms. Has anyone tried this or know if there is any truth to any of it?

I have an o7 v6 g6 that has a max of like 105 if i buy one of these chips is it going to allow me to go faster? and is it better to buy a new ecm outright and pay the extra to keep the original or not?

Go here:
http://www.whiteautoandmedia.com/index.php?option=com_virtuemart&page=shop.browse&category_id=17&Itemid=54

It says it removes the top speed limiter completely, so theoretically it will allow you to go faster than 105. Another tread says it goes up to maybe a maximum of 135 before it runs out of power, but that was a stock '05 GT so maybe with a tune that gives you 10-15 additional HP might get you to what...140? I have only gotten up to about 115 before pulling up for my exit, plus I don't want to have a state trooper catch me at that speed

I can't answer you ecm question but I'm sure someone can answer you question at the site above...or go PM Lampoon, he just got one of these tunes and I'm sure he won't mind answering a question or two.


I started asking around and a some local mechanics suggested that the speed limiters on ALL Pontiacs can be in a way 'turned off' without modification by both turning off the traction control AND by pulling up one notch on the hand brake. They said one notch will not engage the brakes, that it will just trip the alarm at that level and in turn disable the speed limiter controls. They told me that you will be annoyed by the ringing door chime sound and the clock interface flashing and the lights will/may turn off, but the car should reach its maximum if you want it to like this. I haven't tried this yet because it is winter here right now, but I will when it warms. Has anyone tried this or know if there is any truth to any of it?

I call bs on this. Other than it being retarded there are better ways to get to the true top speed.

I have the WAMS BAM THANK YOU MAM tune (http://www.whiteautoandmedia.com/)that Chris does.
I felt a nice difference but dont expect an increase in gas milage.

It makes you have a lead foot which is counterproductive to that goal. lol

this looks like a very nice investment...there's only one other modified G6 in town and he acutally works right across from where i work...it's like a fun little unspoken competition

my 06 GTP shuts off at 115. seems like it has a lot more power to go and doesn't take long to get to 115.

Hey everyone,

I have a 06 GT, and as everyone else has said before, it only tops out at 135, what a bitch. Anyways, since the car is technically in my parents name, and I cant do any modifications without their approval. Can anyone help me spin this into something that would convince them to let me purchase one.

Help would be appreciated.

Why do u need to go faster than that? You wanna meet your maker so soon?

Why do u need to go faster than that? You wanna meet your maker so soon?

http://www.midwood.net/brent/wp-content/uploads/2008/04/ricky-bobby-if-you-aint-first.jpg

Hey I"m new to this cite... but to answer the question about the speed cut off. You can fix it. Here is the web cite

http://www.whiteautoandmedia.com/index.php?page=shop.product_details&flypage=flypage.tpl&product_id=38&category_id=17&option=com_virtuemart&Itemid=54&vmcchk=1&Itemid=54

yeah...check 10 posts up. ;)

gezzz when do you ever need to go faster than 110MPH!!!! :rolleyes:

Running from the cops of course!!!!

Here I come to deliver the BUZZ KILL!
Look in the background; the woman that hit this pole lived, maybe she can buy the one in the back.

http://assets.mediaspanonline.com/prod/2671349/wreck-westinnesstjon02_w300.jpg

is that a Convertable now? I have never seen the rearview outside the car either almost looks like the windshield got completely turned around.

I dont recommend going any faster than you need to "UNLESS" your on a track or road course that is meant for that specific need for speed.

I've had mine up to 135 now. Speedometer said 135 anyway when I started backing off but my GPS says top speed was 134 but I'm saying 135. lol Couple minutes later I saw a good ole Oklahoma state trooper. Never drive that fast again....ummmm maybe. :)

I know this thread hasnt been active for a while but i was wondering if there is anything that has changed. my 2008 G6 tops out at 105 and i want to race it on a track but theres no point if i cant get it any higher. So is there anything that can remove the speed limiter?

nothing changed gotta tune it

I have a stock 08' GT it maxes downhill @ 110

http://i744.photobucket.com/albums/xx84/dg1239/IMG00007.jpg

Thanks WAMS.

:eek:

Careful!!!

Haha, it was a one time thing. Had to see if he really deleted the top speed limiter.

:eek:

Careful!!!

What Pooner's said! Is that '120'? I don't remember how the G6 gauge went beyond 100MPH.

Yeaa, it was 120. :/

Sweet!

on a flat level deserted highway the other night my 2008 G6 GT topped out at 115MPH

I have a friend who's father is a GM mechanic. He will be adding the option code for me soon to add my steering wheel audio controls. I also asked him about removing the speed limiter for me, and he said he didn't think it was possible. Can someone provide instructions on how this is done with the GM tech computer or whatever? Thanks

It can't be.

So u can't remove it??? Tht suxz

not with the Tech II

Well I had to let her breath a little 132MPH, one day I'll see if she can actually do the 140MPH it says on the speedometer. Maybe after I get some green stuff pads so I can get her back down faster.

Kind of off topic, but anybody in the macomb michigan area with a dashawk or scan tool of somesort i could use to do a crank relearn quickly??

I'm local to you so when I tune your car you wont need a crank relearn, we've been over this you just have to actually show up for the appointment LOL

I'm local to you so when I tune your car you wont need a crank relearn, we've been over this you just have to actually show up for the appointment LOL

LOL !
simple enough.


fastest i can go is 105 mph :(
& thats passing on the straightest road
i could find the yellowhead.

No i already got the tune because i needed someone who could work around my work scheduel, i cant do it on the weekends at the time ur open because i work all weekend, all i need now is the crank relearn... Ugh theres always something. And after i got my tune mine dose not have a limiter, i just got up to 135 on 94...

and sorry about not showing up dude lol ik that was really shitty on my part.

I've had her up to 110... But I have yet to punch it after installing the WAMS tune. but trust me.... I'll tell you what it got to!

I hit 120 in my GT, but ran out of road before she was topped out. (before intake and exhaust)

This thread = lol

Dealer did crank relearn for 35.00$ not bad =D=D

What is a crank relearn?

What is a crank relearn?

It's a procedure in which the computer re-learns the normal pulse patterns of the crank shaft during normal operation. It aides in detecting misfires.

It is usually needed when you are putting a whole new pcm in your car in order for the engine to run properly. If you put the pcm in and you notice your check engine light is on and it is code p0315 that is calling for a crank relearn. Theres another code also but i cant think of it off the top of my head.

There is a company called digital horsepower that reprograms the computers for Grand Prix's and I will see them next weekend. I will ask them if they are going to develop the same thing for the G6.



Any news? Anxious to get this thing moving!!!