Adding to MAF curve LEANS out vehicle

[bobert]

This is a weird one; hopefully I'm just missing something small. The main mods are 2010 Camaro with a whipple running Injector dynamics 850

I get into finally doing passes on the dyno, and the car is too lean at WOT. Add to the MAF curve make it go LEANER at WOT . It does this consistently. I have included 2 maps and the scans on the dyno associated with each. The car behaves as you'd expect everywhere until going WOT. In the log, you can see the MAF lb/min increase drastically between these 2 passes (I was getting frustrated and thew a ton at the MAF curve here, as you case by comparing the 2 calibrations). In this case, you can even see the O2 volts swing due to it going lean (after ADDING to the curve)

It pulls cleanly, (i.e. its not reading lean from a misfire, definitely no misses).

I eventually ended up getting the car running, for now, by disabling the MAF and running it off of the calibrated VVE table. However, this is obviously a problem and I don't want to leave the car that way without at least knowing what's going on.

Any thoughts would be great

[mowton]

Are you tuning this setup without a wideband? The tune is in closed loop? How are you tuning? You have way too many PID's (Stay below 24)

Ed M

[bobert]

I am using our in house dyno dynamics dyno with a solid autronic wideband. I added pids during diagnosing this issue, these are the logs that I had to share with a clear indication of the symptom. I tuned the MAF and vve tables for cruise as well, closed loop is on in cruise, its going into PE mode at WOT.

[SultanHassanMasTuning]

Thats very strange the o2 would report that. convert to OL and disable DFCO, how is your fuel pressure?