ryanvv355

iTrader: (17)

Hey guys, I have a magnacharged 6.0 and have an issue with a lean surge right after transition into WOT. The ECM is commanding my PE AFR of 11.8, however according to the wideband it leans out extremely quickly when entering boost. It is very noticeable to me as well so I know its not a wideband output issue. The car drives like a charm at part throttle, no matter what throttle % as long as its not in boost. Once 101 KPA is reached, it commands my PE ratio and falls on its face, leaning out, sometimes as high as 19.9:1. This has got me stumped. Here is a log and my tune, if anyone can help me that would be awesome.

the lean spike in question is in frame 605

hellbents10

iTrader: (10)

Turn your high rpm dynamic airflow disable down to 2800 or so and give it a try.

ryanvv355

iTrader: (17)

Hey TJ, Thanks for the input. I adjusted it down to 2500 and it did not help, still pegging out the WB.

98turbls1

iTrader: (17)

When's the last time that you calibrated you 02 sensor??

ryanvv355

iTrader: (17)

Never, didnt know you could/needed to. Widebands or narrowbands?

hellbents10

iTrader: (10)

Well I looked at your log and it seems as though you have enough fuel being commanded. What is your fuel pressure when this happens.

ryanvv355

iTrader: (17)

You know I thought about fuel pressure yesterday, figured there was to many variables in the tune to warrant an FP test, I was wrong.

Hooked the FP tester up and it read 35psi at idle, a quick rap of the throttle in idle showed 25ish psi. So I guess that explains the problem. The tank is a Spectre performance EFI tank for A-bodies, it has a Delco EP381 pump internal which is stock in Vortec 454 trucks. There where some guys on here that did the calculations and figured it was good to about 450bhp, guess that was wrong. I guess a Bosch 044 is going inline this week.

Thanks for the help TJ.