VE Tuning Difficulties

[cendres]

As you're about to see, I'm just getting started with HPT and am having trouble with one of the most basic calibrations: VE. I've run this thing a dozen times (literally) and it is just not getting any better. AFR stays at ~.95 Lambda throughout the rpm range. It idles slightly rough but seems to run okay once underway, besides the obvious rich condition. It also wants to stall after a neutral rev.

Specifics:
2004 Silverado 5.3 on E85 (prob E70 currently so stoich set at 10.7)
220/220 .581/.581 114 LSA
Long tubes w/ ORY
CAI

I started by using the VE - Wideband O2 histogram but quickly realized it was taking me the wrong direction. So in frustration, I changed to the VE - STFT histogram but seem to have hit a wall. Copy - Paste Special Multiply ad nauseam.

I've been chasing this for the past 2 days and after countless gallons of fuel and no real progress have finally resigned myself to asking for help. I'm certain I must be overlooking some fundamental element here but obviously don't know what.

[1965 ssvert]

I feel your pain, I can't seem to get the "basic" MAF and VE tuning dialed in either. People are starting to wonder about the black Camaro driving slowly in rural neighborhoods or parked on the side of the road with me buried into the laptop. Strange thing is, no matter how far off all the numbers seem the car still runs great. Uber frustrating!

[SultanHassanMasTuning]

change a couple of things

under dynamic HIGH RPM DISABLE change to 12800

Fuel POWER ENRICH
EQ ratio to 1.2 to target a 12.23 AFR
Ramp in change to 1.2
PE Throttle Pedal change to 50% HOT AND COLD
PE enable
MAP TO 70 kpa

That should solve a big part of your fueling

[RonSSnova]

Haha! I was out on a logging run and noticed an old lady staring at me with her fingers in her ears!
Ron

[RonSSnova]

Agree that the PE section is messed up, there is no PE. Maybe on purpose? If so, don't go WOT.
Also noted from the logs, in closed loop cruising, the trims are not that bad. But you show rich.
I'm wondering if your stoich value is correct?
Have you actually measured the ethanol percentage?

Ron


Ron

[cendres]

Thanks guys, especially you Peter Burger. LOL.

The PE is temporarily set to 1.0 as this was specified in the VE tutorial I have been following. Definitely no WOT. I also wondered about stoich value, but I expected the copy and paste routine would reel in the AFR.

SHMT: Thank you. I'm going to try these changes but am a bit confused. Is this going to affect idle and cruise fueling? If I understand, these changes will only modify PE fueling?