Look at the injector duty cycle and the O2 mv. These runs are under WOT. Been battling this problem for months now. Any thoughts? Goes lean and no other sensors mess up. Have not been able to tune it out or figure out whats up with it...





3400 SWAP DONE. 187WHP 212TQ (14.2 @100MPH NA) 240WHP 310TQ (N2O)

Just sent you a PM. I might be able to help ya out.

Do you have a wideband on the car? I do not see it reading in HPT.



FU Tuning

No I do not have a wideband wired in yet. I have a narrowband, which reads completly lean when this is acting up. Its only when I really take off hard that it does this. If I just roll into the throttle its absolutely fine.


3400 SWAP DONE. 187WHP 212TQ (14.2 @100MPH NA) 240WHP 310TQ (N2O)

Nitrous Nate wrote:No I do not have a wideband wired in yet. I have a narrowband, which reads completly lean when this is acting up. Its only when I really take off hard that it does this. If I just roll into the throttle its absolutely fine.

Without a wideband we are shooting in the wind. I have had my narrowband read rich when I was lean on my wideband and the other way around.



FU Tuning

Sounds like your MAF is off..... Are you running it MAF only, or MAF/VE ?





P&P Tuning
420.5whp / 359.8wtq

Screaming for Mercy!! wrote:

Nitrous Nate wrote:No I do not have a wideband wired in yet. I have a narrowband, which reads completly lean when this is acting up. Its only when I really take off hard that it does this. If I just roll into the throttle its absolutely fine.

Without a wideband we are shooting in the wind. I have had my narrowband read rich when I was lean on my wideband and the other way around.

x2 Get a wideband in there and tune the car properly. My best guess is that it goes lean in open loop (PE) because the fueling is untuned.

If you still have a situation AFTER you commanded PE afrs equal the afrs shown on the wideband, at least we know it's not a fuel tuning issue, but i bet it responds 100% better when its tuned properly.

I see, thanks for the advice guys.


3400 SWAP DONE. 187WHP 212TQ (14.2 @100MPH NA) 240WHP 310TQ (N2O)