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[joey]

Steve

I performed a calibration of the MAF but it still gives a 30% STFT at high voltages. Is it normal or STFT should be on the + -5% across the voltage range?

(The LTFT is 6% )

thanks

My STFT also spikes to 50% at wot. Although my LTFT stays put at 0.0%... I must say i did not follow VT's guide on MAF cal, but Abilor's. I will redo my MAF cal combining the STFT&LTFT. Maybe that will solve my issue.

[javigti]

Steve

I performed a calibration of the MAF but it still gives a 30% STFT at high voltages. Is it normal or STFT should be on the + -5% across the voltage range?

(The LTFT is 6% )

thanks

My STFT also spikes to 50% at wot. Although my LTFT stays put at 0.0%... I must say i did not follow VT's guide on MAF cal, but Abilor's. I will redo my MAF cal combining the STFT&LTFT. Maybe that will solve my issue.

Have you increased the diameter of the maf housing?

[joey]

Steve

I performed a calibration of the MAF but it still gives a 30% STFT at high voltages. Is it normal or STFT should be on the + -5% across the voltage range?

(The LTFT is 6% )

thanks

My STFT also spikes to 50% at wot. Although my LTFT stays put at 0.0%... I must say i did not follow VT's guide on MAF cal, but Abilor's. I will redo my MAF cal combining the STFT&LTFT. Maybe that will solve my issue.

Have you increased the diameter of the maf housing?

You mean the intake? I have an 3" SRI and TIP...

[laxplayermjd]

if i understand correctly fuel trims may be able to be ignored at WOT, ltft should always show about 0% when WOT since you are in Open loop. WOT calibration is done logging and comparing desired vs actual lambda/AFR

[joey]

if i understand correctly fuel trims may be able to be ignored at WOT, ltft should always show about 0% when WOT since you are in Open loop. WOT calibration is done logging and comparing desired vs actual lambda/AFR

You are spot on correct!

[skiptownmcat]

I used abilors maf cal method and ltft is always 0 at cruise, it does go to around -6 at idle though. I think I may have a vac leak.

[Steve @ VersaTune]

Both trims go to zero during OL on the 6. I need to look at the OEM 3 code some more to see if there is a bug where STFT is displayed, but not applied.

[skiptownmcat]

Even when I had the hypertech, the stft's would go sky high at WOT so I thought it was normal.

[Steve @ VersaTune]

It may just be cosmetic.

[skiptownmcat]

OMG!! I've been such a tool, my wot maf cal was a mile off. That was causing the throttle closure, I have re-done it and all seems well.