Please help with various fuel compensations

TopMountGSR · Post by **TopMountGSR** » Tue May 13, 2008 12:25 am

I started this thread in hopes of helping others with the same problem. With that being said I am a very novice tuner but I enjoy tuning with such great software. -- We tuned one of our shop cars last night and had 14.2-15 AFR idle/partial throttle, 13.3-13.8 AFR medium load, and 11.4-11.8 AFR WOT under boost When my business partner that owns that shop car was driving it during the day he said he was seeing low 9 AFRs @ WOT under boost I'm pretty sure this has something to do with ECT and IAT fuel compensation, I'm just not real sure were to start. We retuned it tonight and he is going to data log during the day in hopes of helping us figure out whats going on. Any tips on the ECT and IAT comps? Am I on the right track? I'm guessing it was around 60 degrees at night and around 75 during the day if that helps. Also he is running a air to water intercooler on a 57trim vatara d16 setup Thanks for your time DK edit: I'm not real sure I understand the values that you set in the ECT and IAT comps and how much effect they have

Post by **calvin** » Tue May 13, 2008 12:50 am

they multiply fuel. e.g. 10% is fuel x 1.1

TopMountGSR · Post by **TopMountGSR** » Tue May 13, 2008 2:02 am

Thanks that should help me a lil, I'll keep messing with the settings and comparing logs Any other suggestions more than welcome. This sure seems like a 24 hr job for Calvin, I kinda feel bad when he has to reply to such a novice question.

sohcd16y8 · Post by **sohcd16y8** » Tue May 13, 2008 6:50 pm

If you still have the IAT sensor in the intake manifold I would set the values to zero and work from there. When I park my car on a hotter day and then come drive it again, the sensor is saying 120+ degrees even after I drive for a bit. I put another sensor in my charge pipe and it says its down to ambient (70 ish). Once I drive for a while the manifold reading comes down (all of this due to heatsoak of course). This has always worked for me. Or just move the sensor, that helps a lot and is much more accurate.