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Discussion Starter #1 (Edited)
I am waiting to see if a "Cat-Back" Exhaust will become available. If one does not, I plan to have a custom 'Cat-Back' built with 2.5" mandrel-bent SS piping, a MagnaFlow Camaro-style SS muffler and 4" polished tips. I would also replace the resonator with a 'glasspack' muffler. ;)
 

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spoolinturbo said:
custom full 3" mandrel bend SS exhaust, apex'i muffler no cats, or resonator. And probably an RSM intake...and depends what else comes out.
jeff
Neither the 3.5 nor the 3.9 push enough air to justify a 3" exhaust.

Anything over 2.5" and you're going to kill the torque, which is one of the few things these engines have going for them.
 

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otcpharm said:
Neither the 3.5 nor the 3.9 push enough air to justify a 3" exhaust.

Anything over 2.5" and you're going to kill the torque, which is one of the few things these engines have going for them.
on most engines 3" exhaust is the standard after exceeding 300HP. And due to the ratio, if you have about 300HP you should be clost to 400TQ given the ratio on these motors and what exactly you mod, so losing 15 TQ is fine by me for a tone and better flow.
jeff
 

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Bob G said:
I was thinking maybe SCGA1's avatar :D To me that would be the best upgrade of all...
I wish I could have her in my passenger seat, everywhere I go! :)
 

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spoolinturbo said:
on most engines 3" exhaust is the standard after exceeding 300HP. And due to the ratio, if you have about 300HP you should be clost to 400TQ given the ratio on these motors and what exactly you mod, so losing 15 TQ is fine by me for a tone and better flow.
jeff
Hey, if you can get to 300HP in a G6 GT with just a new muffler and an RSM intake, then you've broken the laws of physics so pipe diameter will no longer matter. Heck, even RSM's SC kit will only get you to 280.

Ratio? You mean the HP/TQ ratio? It isn't going to be linear for very long when you start playing with things that are going to push a G6 over 300HP (which, by the way, will require the installation of a 4T65 'cuz the 4T45 ain't gonna take much more than about 250 without turning in its notice).

Hey, that reminds me...we should all send GM a big group THANKS for hamstringing modding efforts with this pitiful tranny.
 

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otcpharm said:
Hey, that reminds me...we should all send GM a big group THANKS for hamstringing modding efforts with this pitiful tranny.
I don't get how it's GM's fault they put in a tranny rated to handle only what the stock engine puts out? I mean, the exhaust isn't loud enough, so we change it. The intake isn't good enough, so we change it. Why should the tranny be any different?
Has anyone even tested what this tranny can actually handle? There's a guy here in town that has an 04 Impala that ran 12's on the stock tranny.
 

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otcpharm said:
Hey, if you can get to 300HP in a G6 GT with just a new muffler and an RSM intake, then you've broken the laws of physics so pipe diameter will no longer matter. Heck, even RSM's SC kit will only get you to 280.

Ratio? You mean the HP/TQ ratio? It isn't going to be linear for very long when you start playing with things that are going to push a G6 over 300HP (which, by the way, will require the installation of a 4T65 'cuz the 4T45 ain't gonna take much more than about 250 without turning in its notice).

Hey, that reminds me...we should all send GM a big group THANKS for hamstringing modding efforts with this pitiful tranny.
im not saying those mods alone will bring me to that level at all, because like you said its breaking the laws of physics, but getting it accomplished before I bring it to that point would be a +
and what does the 4T65 come out of?
jeff
 

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well i would be more happy removing the tranny and having it strengthened by professionals. Than wasting all my time in seeing if this tranny would bolt up to our motor, custom housings and such, blah screw that. And I dont see why this tranny necessarily would go out at 250 when according to the fact sheets its at roughly 200HP now, makes no sense.
jeff

EDIT. I see the 4T45-E is

Type: four speed front-wheel-drive, electronically
controlled, automatic overdrive transaxle
with electronically controlled torque converter
clutch
Engine range: 3.0L - 3.4L
Maximum engine torque: 205 lb-ft (278 Nm)
Maximum gearbox torque: 325 lb-ft (440 Nm)
Gear ratios:
First: 2.95
Second: 1.62
Third: 1.00
Fourth: 0.68
Reverse: 2.14
Maximum shift speed: 5800 rpm
Maximum validated gross vehicle weight: 1990 kg (4347 lb)
7-position quadrant: P, R, N, OD, 3, 2, 1
5-position quadrant: P, R, N, D, D3 (Malibu)
Case material: die cast aluminum
Shift pattern: (2) two-way on/off solenoids
Shift quality: variable bleed solenoid
Torque converter clutch: pulse width modulated solenoid control
Converter size: 245mm (reference) (diameter of torque
converter turbine)
Fluid type: DEXRON VI
dry: 74.7 kg (164 lb)
wet: 85.1 kg (187.6 lb)
Fluid capacity (approximate): bottom pan removal: 7L (7.4 qt)
Complete overhaul: 10L (10.6 qt)
dry: 12.5L (13.2 qt)
Pressure taps available: line pressure
Transfer design: two-axis design, link chain assembly
Assembly sites: Windsor, Ontario
Chevrolet Cobalt
Pontiac Pursuit
Chevrolet Malibu & Malibu Maxx
Pontiac Grand Am
Pontiac G6
Saturn Ion
Saturn Vue
Chevrolet HHR


and the 4T65-E which is in the 3.9 G6

2006 Hydra-Matic 4T65-E Transaxle
(M15/MD7/MN7/M76)
Type: four speed front-wheel-drive, electronically
controlled, automatic overdrive transaxle
with electronically controlled torque
converter clutch.
Engine range: 2.5L - 5.3L
Maximum engine torque: 280 lb-ft (380 Nm)
Maximum gearbox torque: 400 lb-ft (542 Nm)
Gear ratios:
First: 2.92
Second: 1.56
Third: 1
Fourth: 0.7
Reverse: 2.38
1-2 7000 rpm
2-3 6500 rpm
3-4 6000 rpm
Maximum validated gross vehicle weight: 2903 kg (6400 lb)
7-position quadrant: P, R, N, OD, 3, 2, 1
5-position quadrant: P, R, N, D & DSC +/-
Case material: die cast aluminum
Shift pattern: (2) two-way on/off solenoids
Shift quality: variable bleed solenoid
Torque converter clutch: pulse width modulated solenoid control
Converter size: 245mm and 258mm (reference) (diameter of
torque converter turbine)
DEXRON IV
BOT190M1 - all wheel drive fluid for power
take off unit
93 kg (205 lb) (M15) (wet)
96.6 kg (212 lb) (MN3) (wet)
97.2 kg (214 lb) (MN7) (wet)
112.5 kg (248 lb) (M76 with power take off
(PTO) Unit) (wet)
Fluid capacity (approximate): bottom pan removal: 7L (7.4 qt)
9.5L (10 qt)
12.7L (13.4 qt) (dry)
13.1L (13.8 qt) (M76) (dry)
Pressure taps available: line pressure
Transfer design: two-axis design, link chain assembly
M15: 245/258mm torque converter
MD7 - 245mm China Applications
MN7: 258mm torque converter and heavyduty
gearbox
M76: 245/258mm torque converter & (AWD)
Assembly sites: Warren, Mich. (M15, MN7, M76)
Shanghai, China (MD7)
Chevrolet Malibu (M15)
Chevrolet Malibu Maxx (M15)
Chevrolet Impala (M15)
Chevrolet Monte Carlo (M15)
Chevrolet Uplander (M15, M76)
Buick LaCrosse (M15)
Buick Lucerne (M15)
Buick Terraza (M15, M76)
Buick Rendezvous (M15, M76)
Pontiac Grand Prix (M15, MN7)
Pontiac Montana (M15, M76)
Saturn Relay (M15, M76)

and heres your standard 6speed numbers too

2006 F40 (MT2)
Type: transverse front wheel drive, six
speed manual transaxle
Engine range: 3.9L
Maximum engine torque: 245 lb-ft ( 333 Nm )
Maximum gearbox torque: 295 lb-ft ( 400 Nm )
Gear ratios: MT2
First: 3.77
Second: 2.04
Third: 1.32
Fourth: 0.95
Fifth: 0.76
Sixth: 0.62
Reverse: 3.54
Final Drive 3.55
Maximum validated gross vehicle weight: 3527 lb ( 1600 kg )
Case material: aluminum
Center distance: 197 mm
Fluid type: Castrol BOT 0063
Transmission weight: 56 kg ( 123.5 lb )
Fluid capacity (approximate): 3.1L / 3.27 qt ( dry )
Power take off: no
Applications: Pontiac G6

now you tell me if there is something wrong with these rated numbers.
jeff
 

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Blackrider said:
GM Rates all their trannys low for liability reasons. I dipped into mid 14's with my GA and never had any issues with the tranny. At the time that those specs where drafted 205f/lbs was probably the most being pumped into a 4T45 by any GM vehicle.
hmm well i dont want to do too much to my car, I just want intake, exhaust, PCM upgrade (when available) some springs and SC(and of course all incorporated performance parts to allow such a mod). The supercharger is going to bring the most power out of all these projected mods of course. I just hope it does not bring my cars tranny to a halt. I dont drive this car hard rarely, due to my payments haha.
 

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spoolinturbo said:
hmm well i dont want to do too much to my car, I just want intake, exhaust, PCM upgrade (when available) some springs and SC(and of course all incorporated performance parts to allow such a mod). The supercharger is going to bring the most power out of all these projected mods of course. I just hope it does not bring my cars tranny to a halt. I dont drive this car hard rarely, due to my payments haha.
Supercharged GA start running into problems around 22oWHP, but switching to a full synthetic and installing a larger cooler will prolong is life, and its all how you drive it to.
 
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