Back when I first started researching the RXL EFI I read about them a lot.. Everything I could, including several other forums besides this one.
In many threads replacing the ECU was brought up, and almost every recommendation was, that if they had a choice of years to replace their ECU with, to replace it with a 91 because the 91's had the best performance. And no threads had people coming back screaming that they'd fried their engines.
Having looked at both the 91 and 95 maps, there are some minor differences.. I believe there were 3 (out of 256) locations with minor enrichment changes (at idle speeds) on the main fuel map, and 2 other maps. And the associated code that read those maps was changed, but I never finished disassembling the 95.
As far as the ECU's themselves, the only difference I've seen is that the later models have the big a$$ cap inside the ECU instead of connected to the diagnostic plug. I'm assuming that is because people kept losing them, and CPU's like smooth power so the ECU's were puking.
Having both rom's to play with on FrankenStorm, I've personally found the '91 to start, run, tune, and sound, considerably better. (making the exact same changes)
But you've been working on them since the dark ages. Haven't you ever thrown the wrong chip/ECU in one when you were in a hurry?
95 - Storm 800 - Modded - AKA: FrankenStorm - Totalled near 100mph at Tug Hill!
96 - XLT/SP with Storm 800 trip/trip and now EFI - FrankenStorm II lives...
95 - RXL -- Sale Pending --
05 - Edge 800 long track - Stayin' stock for now..
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It made me more compassionate, more empathetic, more nurturing...
I FEEL LIKE I'M TRAPPED IN MY OWN WORST NIGHTMARE!!!
