E38 - How to smooth out Idle/Low RPM - MAF only?

[tunedportcj5]

Forgive me if I have missed this in another post or tutorial, i have been researching for the past few hours with no luck! ;-)

MAF tuning has been a dream with the E38 but smoothing out idle - and low rpm accell has been a bit more challenging. If I fail the MAF to SD, my idle/accell issues go away. MAF BEN's are +/- 2%.

Motor is a stock 4.8, LS3 MAF, LS2 intake, with LS6 cam. 80lb injectors could cause an issue I guess.

Can I run SD until a certain RPM or MAF frequency? I set my MAF fail LOW to 3000hz, it failed but would not re-enable above those frequency's and stuck with the VE values. I thought it is supposed to re-enable?

12425

Thanks,
David

[swingtan]

A log of the issue would help. With the mods you have, I would expect the car to run like a stocker, especially with the auto. In most cases I've seen, low speed roughness is usually due to fueling, so I'd start there. The logs will tell the story though.

Simon

[tunedportcj5]

Thanks Simon, what PIDs would you recommend me logging for idle fuel, spark, etc...?

[swingtan]

RPM,
ETCTP,
MAP,
VSS,
SPARKADV,
IVLVTMP,
IAT,
AFRATIO_DMA,
APCYL_DMA,
MAFFREQ2
MAF,
WO2AFR1
HO2S11,
HO2S21,
SHRTFT1,
SHRTFT2.

That should do it for starters....