[will_drift_4_food]

I know that this is an old(-ish) thread, but NOWHERE have I found a definitive list of ECUs and what o2 sensor they are running. Maybe folks can contribute what they know to be the ABSOLUTE correct ECU+o2 sensor combinations. I purchased my blacktop S13 motor from a reputable dealer, straight from Japan. It came with a chipped E5 ECU, which is now stock due to presumably being tuned for a Z32 MAF. After I unloaded the motor at home, I noticed that it had a shimmed actuator, and the turbo coolant lines had been removed. Later yet I found that it had a skinny (Titania) sensor screwed into the elbow with no wires coming out of it, and one t25 flange stud was broken in the manifold. I didn't think much of any of these things, and others have reported similar experiences, so I just added them to my to-do list. I do believe that since someone has modified the motor in the past, it is not unlikely that they didn't run an o2 sensor at all, and just put the S13 redtop elbow on as a replacement. The only motors that the importer was getting at that time were S13 blacktops, so I never really questioned whether the ECU I had was correct for my motor.

I bought the fat sensor and plugged it in. I run rich off-throttle, but it I can tell that the ECU is making corrections by the UEGO going from 11.2-13.7, but sometimes lower than 10.0 (which means I have no idea the real AFR, thanks AEM. I kid). Honestly, I believe that to be a combination of IACV adjustment, incorrect timing, fouled plugs, and possibly a faulty CTS sensor. All of this hinges on getting my tach working (or Consult wired) so that I can set the timing properly.

My motor is in an AE86 chassis also, so various other things have changed that may contribute to an overly rich condition.