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I have recently finished my S14 SR20DE+T into my '93 240SX swap. I am using a JWT tuned 1991 Infinti G20 ECU with the engine. It is tuned for my setup (370cc plus turbo, 240SX MAF). Anyway, it starts and idles good, but bogs down and sputters when you open the throttle. I have tested all sensors, wiring, timing, TPS, everything is as it should be. No check engine light either. I tried the original 240 ECU, just to see what would happen, and the bogging is gone, seems to run better! Anyone have any ideas? Is there a difference in sensors between a '91 G20 and '96 S14 that I am missing?
Stumped for now,
Ryan-o

If I'm right, the G20 is OBDI and the S14 is OBDII

Also - is the SR20 an S14 engine or an S13 engine? If it's the S14 engine, it has variable cam timing on the intake side, and neither the G20 or the stock KA ECU has the ability to deal with that.

You'd be better off either getting the KA ECU modded to run the fuel/air setup you're using, or get an SAFC to piggyback on the KA ECU; you should be able to do that with just 370s and stock MAF.

Good luck.

Thanks for the reply. My setup is kind of a Frankenstein. car: '93 240SX hatch, engine: '96 SR20DE with S13 DET parts bolted on. ECU : '91 Infiniti G20. just to name the main things! It's OBD 1. Wired using the original KA harness. The ECU has been programmed by JWT to run my setup minus the VTC. I will have to get an RPM switch eventually to run it. Right now, I have a switched 12v source that turns on with the ignition. The stock computer has the VTC on most of the time anyway according to the FSM. The main wiring between the G20 and 240sx to the ECU is so identical that I can plug either ECU in and it run with no problems! It's rather amazing to me. Anyway, i have ruled out almost everything but the ECU being coded incorrectly, but I have no way of seeing what the ECU is doing. Just wondered if someone had any insight.