After a WAMS tune, will you damage the car if you fill up 87 octane instead of the 93 once in awhile? i also must ask what is invistune and why is whiteautoandmedia charging an extra $15 for it? also, it says delivery method: "ship in your ECM/TCM" or "spair ECM outright" the latter adding $135 to the order? what is the ECM and do i already have one in the car i can ship in or what? is it like a handheld computer to program the car? what is a dash hawk btw lol
You won't damage the car if you fill up with lower octane. You just may get more knocking and the PCM will likely retard the timing to stop knocking, so you'll lose performance. Best to stick with the higher octane the tune was written for. If you continue to run a lower octane all the time with the tune then you may start to cause some damage, but really you'll just lose all the extra performance you paid for.
Invisitune makes the tune more undetectable, say you bring your car in for warranty work, the dealer could hook up a scan tool and wont be able to tell you have a performance tune.
Every newer car has a PCM (powertrain control module) and a TCM (transmission control module) some have both built into one.
the PCM is that little metal box with small fins on it that sits towards the front of the car right in front of the battery box under the hood. You can remove it and send it to WAMS to get tuned, or you can pay a little extra for a spare PCM/TCM. That's what I did. So once I received it, it was just a matter of swapping the new tuned modules with my OEM module. If you choose to ship yours in then you obviously can't drive the car until you get them back and install em.
A dashhawk is an OBDII scan tool that allows you to monitor your vehicles sensors as you drive. It can also put the car in CASE relearn mode to learn the crankshaft position sensor angle. This may or may not be required after installing your tuned PCM. Usually only a dealer or someone with a GM TECH II tool can do the relearn. Its really hard to find a dashhawk these days