Lean tip in/low advance, makes the car stumble and backfire [LS3 Stroker 24x]

Hi,

I been tuning this thing for weeks now, it runs and drives really nice! All is good, except for when you really punch the throttle from a stand, still or very low speed speed.
Then its hesitates, stumbles, maybe backfires a bit, then breaks traction - and off you go in smoke! :cool:

I have provided my a log where you can see that I provoke this, I get a lean spike just before the PE comes in. My spark advance also drop really low?
I?ve deleted almost all burst knock, so Im not sure where its coming from? If I log all advance modifiers PIDs they are all 0. (Not in this log but tried it the other day).

Is it the lean tip in on 16-18:1 AFR, that causes the stumble, or the drop in advance? Both?
Im also under the impression that my injector data is correct? Could that cause this?

VE and MAF is dialed.It will do this in SD, MAF open and closed lopp. No change.

LS3, 92mm TB, LS3 intake, LS3 injectors, 233/240 cam. 24x 411 LS1 PCM.

Please let me hear what you think?

Following. Mine does exactly the same u described although its a ford coyote.

was this solved? having the same issue.

I cannot look at the logs at the moment without my laptop and i will not guarantee that this is your solution, but from my personal experience with 0411 24x swaps and a few other people that ive seen the exact same symptoms, i would look into injection timing.
I could throw somthing together for you

https://forum.hptuners.com/showthrea...se-step-inside



Reference

what specs are your cam and what are your idle pulsewidths?


Also what map sensor are you running?