I'll post some information I have on S15 ECU codes because the internet is massively failing me at the moment.
So far I've encountered 2 coded ECU's for S15's. Both from the Japanese Market.
Some information from Pete at PLMS developments:
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Traditionally Nissan start off with "00" at the start of the model run and just increment each time there's an update. These are nearly all incremental. So you can swap anything in the series. We've got 91F 00, 01, 05, 06, & 07. These are all JDM images. Autos are 10 and 11. Aussie S15's are 93F00, 01 etc.
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The ECU codes that I both have and tested on my JDM S15 motor are "QT" and "NQ"
QT part number is 23710 91f05
NQ part number is 23710 91f08
So from the above paragraph you can see why Pete's conclusion makes sense.
Also just some good information to have:
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Usually the best images are actually the early ones! What seems to happen is that they release the model and then tunes are updated based on feedback from dealers. From what I can work out this must often be complaints about detonation - due to inferior fuels and/or local conditions (like here in Oz we have lesser fuel than Japan and hotter weather). So they richen mixtures and lessen IGN timing figures = less power.
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