Ok trucks running a tad off, logged in and notice only 6 degree of timing @ 60% throttle, and lower at WOT. So I figure I would up the base "10 degree" numbers to 12 degrees. The orginal numbers on the table were at 0.

So go for another test drive same problem 6 degrees and less. So the question. Where in the world do you adjust the timing on this thing, **** I miss the distributor days. lol.

Truck has 7lbs of boost right before all the timing crap happens making that bounce around, and even stumble. Stumble only happens at wot. Air fuel is 11.4 to one. IAT is 152 Max so far. Base IAT is 108-118. KR 1.1

Any help would be much appreciated.

Ricky

 

There's a lot of places where it could be pulling timing. What I would do is go through and log as many of the timing PIDS as possible, then you can see what is pulling timing. KR, IAT's, ECT's, etc etc. There are a bunch of timing pids, I want to say something like 14 or 15.

 

One of the first places I'd look would be in the IAT timing tables. At 150+ IAT I'm sure it's pulling timing from your base table. Don't confuse that with knock retard, these other tables are adjustments to your base table. Air temp is a big one. Thing is, if you're running that much air temp I hesitate to disable the IAT timing tables; I'd much prefer to reduce the air temps.

Bottom line, some other table is subtracting from your base table.

Jody

 

Thanks for the end put, I will check and see. The air temp is at the max, the timing retard happens before max temp.

Ricky

 

Factory tables can start pulling timing as low as the mid 80's IAT. By the time you hit 100-120 they can really be pulling 5-7 degrees or more, and from there it just gets worse.

I have not seen the IAT tables on the trucks other than my Lightning, but that is how it was on my GTO.

Jody

 

What FI system is your truck running?

 

Front Mount Turbocharger. will that effect the tune between blower or turbo?
Ricky

 

I agree. Log the "EST" PIDS as well as KR and the High/Low Adaptive Spark Scaler(ASPARK) to try and determine which table is pulling timing. Many with blowers have disabled Burst KR. Might not be an issue with turbos. When you say you upped the "base" numbers, did you increase the "Base Spark" table(only applies to closed throttle situations) or the "Spark High-Octane" table. Not sure why any of those tables would have been filled with "0" values. Octane scaling between the High/Low tables can be disabled by copying the High Octane table to the Low Octane table or setting A0000 to "Enable" and A0001 and A0002 to 100% if are running a custom OS.