Ive put an SR20de into my s12. Its got a annoying issue which i think is possibly an issue with having no speedo wire connected (gazelle uses speedo cable so no electronic module to give ecu a speed signal)
When in 1st and 2nd, i can accelerate completely to 7000RPM+ (havent touched limiter) however, as soon as i get to third at around 6000rpm it completely cuts off fuel every time. if i shift into fourth it remains cut until i let off throttle for a few seconds or slow down. Havent tried to see if it does this in fourth however im going to asssume it will at probably a lower RPM than third if its load orientated.
now i have read from PL on here
If i order a type 3 nistune board (which i was planing on doing in the future but not at current time) can i disable the speed sensor DTC flag so this cut no longer happens? Im unable to get a speed input due to the speedo cable in the gazelle and wanting to retain factory cluster. Otherwise is there a way i can trick ECU into sensing speed until i purchase a type 3 board?" Some Nissan ECU's will get very upset if the speed signal isn't present. I don't think it affects the tuning so much as the actual running of the engine. They will simply injector cut at a certain point. S13 SR20DE is a classic for this. I do wiring looms for engine conversions, so I've now seen this a few times.
The S13 DE will run fine until it's held wide open (6000rpm+) at high load (3rd gear+) continuously. So most road cars won't even see the problem. But race cars can and do. Once they've run for about 5 seconds under these conditions they will injector cut. Hard.
Others I've seen do this during bench testing are GTiR SR's and I recently tested a Z32 ECU and they do it too. S14 SR20DE's will do the same, but take longer - about 10 seconds. Most will recover once RPM drops below a certain point.
Most SR20DET's don't seem to care.
PL "