Quote:
Originally Posted by GOLDCYLON
According to DOM a 95 ECM will work on a 90 91 92 93 94 and of course a 95. A 90 ECM will not work on a 91 92 93 94 or a 95.
He said the issue was they are backwards compatable if its at least a year newer than your car however not compatable forward.
This surprised me as I thought the difference was only at the PROM level between the years as the ECM for the LT5 platform was the same.
I trust DOMs opinion as he is the tuner master, but I will admit I was surprised by this. GC
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GC,
At one point I may have followed the "urban legend" on LT-5 ECM compatibility, but last year I gave Marc my 92 ECM to test forwards and backwards. He also did the same w 90 and 95 ECMs. That thread can be found here.
http://www.zr1.net/forum/showpost.ph...70&postcount=1
ECMs are fully interchangeable. The issue, and this may be where confusion comes from, has to do w the prom. The 91-95 proms have on board KS circuits, while the 90 prom does not. If you cut the KS circuit board from a 91-95 prom, it can be re-programmed for use in a 90Z. However, a 90 prom, without the KS circuit, won't work for a 91-95Z.
Also, you cannot swap the
calibrations year to year. With the exception of the 93-95 MY, each year ZR has a unique calibration mask. And there is an "A" version of each mask. Hope that clarifies things.