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Disable LTFT.

If your fuel trims are way off, you can use the wbo2 error to get them close. Then use fuel trims to dial it in that uses the narrowbands. IMO the best way is just disable LTFT's and use only...

Depends on if the cats are still installed also. IMO on a dyno you should tune closed loop, idle, cruise with narrowbands and then when it comes time to do WOT tuning you remove a narrowband and pop...

The goal is to log via HPtuners so you can setup logging MAF vs AFR error. This way you can just copy past into the MAF table to get the PE dialed in to whatever you set it too. Running the wires...

When you add modifications that adds airflow you need to adjust your VVE and MAF tables. If you change the intake size the MAF needs tuned. I highly recommend learning the basics of how fuel...

Being a novice tuner like yourself I would work off the current tune since most of the drivability stuff is probably pretty good.

Living in high altitude I have seen stock cars swing 10-15% going from 5k altitude to 12k+. Dont chase your tail on the trims. Within 5% is perfectly fine.

Oh, that's not good. Didn't know you could hear the ping. Definingly need to look into fuel delivery. If pump, fuel pressure is good I would think about trying to swap some other injectors over...

Make sure you install GM original sensors. Not aftermarket.

I see your fuel pressure falling off but its still above 50psi which should be okay. Might need more tuning with the AUX pump, I would think that you have enough pump to keep pressure up. I believe...

Thats what they call false or phantom knock like everyone is saying. Do you get knock at WOT? Make sure the exhaust is not hitting anything like frame rails, should be completely suspended by the...

So I noticed this same issue when I adjusted the OL tables when I was having a super rich startup when cold on e85. When I leaned up the OL table I got the lean tip in issue. I richened it backup and...

Why dont you post your exact vehicle, year, mods, log, tune. You literally just posted this with just a download file, no info of what its from and what your issue is.

Race Proven Motorsports posted a new 5th gen ZL1 video. Same issue. So it looks like this is pretty much happening to all these motors. I reached out to Fran the tuner/owner and he said he doesnt...

This is pretty much how mine came out. And yes if I interpolated between the humps I would be rich in-between the lean spikes at those two rpm points. Even with these humps and little humps in the...

I also tried that with no change. RaceprovenMotorsports posted another slightly modded V2, pretty much identical to my setup and made close to the same power as me. And just like clockwork.

Probably because yes its under boost, but its low rpm, lower load and onset of PE hitting. Not as dangerous to be slightly lean for a small period of time at low RPM. But the CTS-V was dang lean...

I also watched another v2 video and then an LSA ZL1. The ZL1 was commanding mid 11 AFR before the spike to high 12's. The CTS was commanding 14'ish under boost at WOT before spiking to 16's. Not...

You might want to start a new thread. Post your tune and log file.

Actually, now that I think about it, you're right. When I was testing the PE table, I probably had that table zeroed at the time.

Yeah, that's how I do it also. I think I might have tested the PE adder and didn't notice any added spark advance. But I don't remember now. I didn't even notice in the tune till you said this...

It looks like an unfinished tune to be honest. What's funny about the VE table is it has the same peaks at 1600, 2400-2600 and 3200. Just like all us CTS guys that are having the lean spike issue.

How much time did you drive after reflash? I'll show lean after reflash. Takes about 10-20min driving before I get clean data. I barely drive on gas so I've done all my tuning on e85. When I go to...

His 1st post has a log. Its spiking to like 18afr on tip in when he goes WOT. Then quickly recovers to commanded.

Seems like this must be either GM designed or a bug in the software. Its more noticeable when we start to mod and untuned because I used to really feel it till I tuned it out as much as possible. I...