1stL98

has anyone ever changed there ecm to a newer one?ive heard 86 and newer are faster in processing engine info,and it eliminates the maf burn off module.any info on procedure wud be great.

85MikeTPI

I wrote this page up a while ago for my '85 Z28, most of the info will carry over to the vette.

http://www.eecis.udel.edu/~davis/z28/ecm_swap/

Bypassing the MAF years and jumping right to a speed density '90-'91 would be a better choice. Vette's have to deal with the dash computer though so keeping the stock ECM to run it in parallel is an option.

ggrassmid

rodj

You still around?
Have been using your excellent info for 10 years

85MikeTPI

Thanks.. Still around.. Only on here for the past few years, but still over on TGO and LS1TECH.. Into T56's now.. Still doing TPI ecms whenever possible too..

coupeguy2001

are u the guy that went to a map and a maf to show efficiency for a grade?? I have your handiwork in my desk at home, and in the car, and in a notebook at work.
Thanks man.

85MikeTPI

Yup, thanks.. I built an interface harness to let me swap between MAF and MAP at the track for back-to-back comparison.

http://www.eecis.udel.edu/~davis/z28/ecm_swap_730

I stuck with Speed Density and have to try real hard to remember how to tune MAF systems...