Quote:
Originally Posted by KingLT1
Turn the timing back to 12 degrees, get the fueling sorted, then creep the timing back in.
I know on my buddies P1x car it will only tolerate 12-13degrees on 93. It has full LT4 fuel system and making 7psi average and 9.5psi peak at 6500rpm.
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Ah, you are right. I did set the timing back by 5 degrees to do the MAF, and then once got the MAF correct, set it back to prior.
Then I tackled the PE issue.
It's been said so much that the canned tune is a safe tune! IT IS NOT! I was thinking that surely the canned settings for timing had to already be conservative, but in hindsight, they look rather aggressive. What a weird mix of settings for a supposedly safe tune.
Looking at when the KR comes on, it's right around 15 degrees. So I neglected one of the basics of tuning, which you have reminded me!
I am also getting around 7.2 psi of boost registering on the gauge now. I'm sure the cooler weather helps that, or maybe just engine getting healthier? Not sure boost scales with engine performance like that, or just RPM and temp.
So recap of changes to fix the canned tune so far:
- fixed the MAF scaling
- fixed the PE not applying correctly
Todo:
- Reduce the timing from 16-17 advance at WOT, and will probably end up around 14-15 from what I'm seeing. Manifold Air Temps def play a role in how likely the KR is. I think there is a scaling factor or table for that I can play with. Much worse KR when it was 88 ambient w/ 130-150 MAT. With 70 ambient and 110-120 MAT, much less KR.
- Try to get PE lambda down to .825 or even .800 without exceeding 6 ms inj pulse width.