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Re: Differences between ECU's? (yearly) Posted by RS [Email] ![]() ![]() ![]() In Reply to: Re: Differences between ECU's? (yearly), Mike Kornely, Wed, 27 Nov 2002 20:43:51 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Glad to hear that you didn't cook it. If you did cook the '88, I believe that you could put the EPROM from the '88 into the ECU from the '86 and keep the same fuel mapping. The processors are the same, so they would read the code in either of the EPROMs and operate.
I think that the part number differences between the years of like LH types mostly represent the different code on the EPROMS. On the '89s, it represents the presence of the kiss-of-death fuel pump output solid-state relays :-(
You're right about the cosmetic nature of the '86 SPG (not that it's a bad thing, of course. I'd love to have an '86 SPG), and the only tuning difference between the '88 SPG and the garden-variety '88 900T is in the APC box.
As a side note, I've been experimenting with LH 2.4 ECUs in my '89 SPG after the ECU died a couple of months ago. I've now run LH 2.4 ECUs from an '88 900S, '89 900S, '90 900S, and '89 9kT in the thing. The fuel mapping seems to be a little funny in the 900S models but the car runs much better with those than it did with the original '89 900T ECU. Using the roughly-calibrated gluteal dyno, the 9kT seems to have a bit more punch in the low end. But that could just be the coffee :-)
posted by 172.162.34...
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