your advice please

[ChevyHighPerformance]

We tested at Pgh Raceway last night and the times were pretty bad (not worth the bandwith to post). Today we AutoTap'd and saw the timing advance at WOT to be about 10-11 degrees with about 1 degree of knock retard. (The programming is the Superchips that came with the Radix.) The O2's were 920 mV. No codes or misfires stored. The IAT was reading 155 F which was way to high. Could this high of a IAT reading alone be enough to drop the timing from 18-19 degrees to 10-11 degrees?

[deezel]

The stock radix tune I am looking at has a max of 9* timing reduction close to the IAT range you are seeing. So yes, the tune can pull that much timing based on that IAT. O2s around 920 isn't too bad... neither is 1* of KR. But, you'd prefer to see no KR with a blower.

Have you checked the intercooler system for any problems? I recall one or two members here who had some intercooler problems in the past. Getting those IATs down will definitely help.

[ChevyHighPerformance]

Thanks for the reply! The IAT sensor has to be bad. We are going to replace it tomorrow. I didn't know if that high of a IAT reading could cause that much timing to be pulled back.

 

The intercooler pump seems to be working fine and the coolant is full.

[ChevyHighPerformance]

The IAT was good. Intercooler working fine. Still low timing. Anyone stuck on the "low octane" timing table? Any suggestions?

[Farmtruc]

Try and reload your Superchips tune, maybe that will reset the PCM, if you're seeing timing that low, your truck will loose lots of power.

 

 

allen

[BigTex]

Follow the superchips reloading suggestion. When your truck sees knock events, it learns what conditions caused those results, then will pull out timing before it happens again under similar conditions. This is the transition from low octane to high octane. Resetting the PCM by loading the superchips program will clear all learned parameters.

 

Also, yes, high IAT temps will absolutely kill performance.