blwest187

I just bought My 02 trans am m6 car. Well the car came tuned to 3.90 gear but have not been installed yet, so it's still running on the 3.42. Will this cause any issues with Acceleration or anywhere else for that matter. Just seems to not pull as hard as one would think for the mods.


Next question: it has a 226/236 duration 600 lift at 110 lsa cam in it. Idles around 800-900 with AC on it seems to be a little higher with it off. But when coming to a stop is almost dies because rpms drop to low. Do yall think it needs Retuned or could the be a issue somewhere im missing.

showdog75

iTrader: (8)

How can your car be tuned for a 3.90 gear when it doesn't have a 3.90 gear?

blwest187

Well my guess would be to tell the tuner im going to put 3.90 gears in so can you tune it for that?
The speedo is Definitely set as if it was 3.90 gears. ik this by my speedo being at 70 an the car going closer to 80. I found a Online calculator that would till the speed difference between the gear ratio.

blwest187

To be clear I was told it was tuned for 3.90 I didn't actually do.

G Atsma

You tune an existing setup. You can't tune what ain't there yet.

SLP IROC-Z

iTrader: (14)

Therr really isn't any tuning involved for a gear change on an m6 car, it just corrects the speedo. But if you dont actually have the gears in and the ecm was programmed for the 3.90s it will affect some speed related parameters but i doubt it would make the idle worse. Sounds like it just needs a retune in general.

blwest187

Yup its going to the shop later this week to get the 3.90 gears new axle seals, engine check over sn Retuned!