Hello, i've search on the forum and i didn't find what I was looking for... I have a almost stock 1995 Z28 M6 and i bought a 3.90 gear set, and I bought a aldl USB 16 pins connector. What I want to know if there's a free tool to set the new speed ratio in PCM. Because I don't want a performance tune for now, only change that... Maybe not... Cause if not, i'll go for madz PCM4less or Lt1edit

thanks!!

 

you can get the free trial for tuner CATS and buy the $20 definition file for your car.

I would send you a stock file with the correct calibration for the speedo but I haven't figured out how to do that yet.

Maybe someone else could help you out.