Bad KR on WOT.. sometimes

[pghalcrow]

I'm seeing some gnarly KR at WOT no matter how much timing I pull back. It looks like I'm going lean, but this doesn't always happen. I noticed if I ease into it, I can keep the A/F proper and don't go lean, but here's an example of when it didn't work out for me. I'm running a 6.0 with an LSA using a boost referenced regulator on a return style fuel system. I feel like I'm going to destroy this motor (again..) if I keep trying to figure this out. Asking the community if there are any issues on the tune that sticks out. I have no problem adding any info to this if requested. I'm attaching the tune, log and channel config files.

[edcmat-l1]

Any adapter plates?

What injectors?

[pghalcrow]

Any adapter plates?

What injectors?

No adapter plates, I'm running stock LS3 heads. The injectors are Fuel Injector Clinic 850cc on a 535 lph in-tank pump.

[Alvin]

This is going very lean in boost just about every time.

You verified fuel pressure?

[pghalcrow]

This is going very lean in boost just about every time.

You verified fuel pressure?

Fuel pressure does seem like the culprit here. I wanted to reach out to folks who know better about tuning than I do to verify I'm not doing anything dumb with it before chasing down mechanical issues.

Reason I ask is because the only change from when this wasn't happening to it is happening is the tune, which I sometimes make small adjustments - mostly the high octane table when I get pinging.

The vehicle does have a VaproWorx controller that I suspect may not be ramping up the fuel pump like it should when the manifold pressure hits a threshold. I'm going to bypass this to see if it resolves the issue.

[blindsquirrel]

Or just do it the way an actual technician does when investigating something similar, put a fuel pressure gauge on it that you can see from the seat and go drive it.

[pghalcrow]

Update: turns out it was going into KR due to going lean. It was not the tune, but fuel pressure. Turns out my Summit in-line filter screen had crap in it (new build, crap got in tank I'm sure) causing a restriction resulting in a pressure drop under demand. I now have a fuel pressure sender hooked up to my Dakota Digital RTX display so I can keep an eye on it in real time.

Remember kids: check your fuel filter