Anyone tried to patch in a different ecm into the exsisting harness? I want to upgrade my 85 ecm with a 7730 speed density unit. Just wondering if it can be done or do I have to buy a painless kit for 300$?

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ZZ4 crate motor,Stock tuned port,afpr,700R4 art carr shift kit,3.42 posi drums,Eibach pro kit,poly bushings throughout,yadayadayada

 

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ZZ4 crate motor,Stock tuned port,afpr,700R4 art carr shift kit,3.42 posi drums,Eibach pro kit,poly bushings throughout,yadayadayada

 

First of all, the plugs going to the ECM are different in the 127730 unit. Second, the speed density uses a MAP sensor instead of the MAF that your 85 has. Your best bet is to find or buy the 127730 computer, then get your wiring harness upgraded. I sent mine feul injection specialties in Texas, www.fuelinjection.com. It cost $375.

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'88 IROC TPI 355, fully balanced, 9.75:1 compression, fully ported '70 truck heads(for now), Harland Sharp Roller Rockers, Comp Cams TPI cam, fully ported '90 speed density TPI with '86 base so it fits older style heads, Crane AFPR, Flowmaster 3in. exhaust, Edelbrock TES headers, all emissions equipment is still intact, plan on burning my own chips, many more mods and parts on the way as time and money permits =(
Best E.T. with TBI 305: 16.11 @ 82mph
Haven't been to track with new motor
Won bracket races at Numidia Raceway with my '70 Nova
In memory of Dale Earnhardt, I'll miss cheering for that black #3 on raceday!!!

 

Or you can do this: http://www.ece.udel.edu/~davis/z28/

Mike did an outstanding job, we converted my 85 to the 86-89 "165" ECM, check it out.

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Kevin Irving
85 Trans Am WS-6, 305 TPI, custom burned '86 PROM with '87 "165"ECM, Accel Supercoil & 8.8 Wires, MSD 6AL, Aluminum Driveshaft, TB Coolant Bypass, Ported Plenum, Modified MAF, Syclone Fuel Pump, JET Airfoil

15.556 @ 86.65mph, Nov 10, 2000.... I know it sucks.. but it will get better!

http://www.geocities.com/transam85tpi/