I heard one computer is optimized more for performance than the other for 88 350s. Can anyone verify this ? How can I tell the difference? ECU identification numbers?

 

As far as I know the 86-89 ECM are all the same. There is probably minor changes to the PROMs each year but they use the same ECM. Ive never heard of a "performance" ECM though.

You might try posting this in the PROM forum. Those guys will know for sure but Im fairly certain that there is no different one.

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-86 IROC
Vortech Supercharged 406
-=ICON Motorsports=-
"Well, you're equipped to be a prostitute, but you're not one, are you?"

 

The ECM that comes with the 86-89 F-bodies (TPI) and Vettes is part #1227165, and that's the only ECM used. That same ECM was used in MANY GM vehicles, as I posted before, for my ECM swap I pulled my 165 ECM from an Astro Van. Like Guido said, it's the PROMs that are different through the years/models.

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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/

[This message has been edited by Kevin Irving (edited March 08, 2001).]