PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Leave it alone or keep tuning?

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Old Jan 10, 2007 | 01:25 PM
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marthastewart's Avatar
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Default Leave it alone or keep tuning?

My LTFT has been holding most of the time from .8 to 1.1. Think I should leave it alone or make some more adjustments to get it in the negitive?

Anything spifically to adjust to make this move the slighest bit?

Thanks
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Old Jan 10, 2007 | 01:29 PM
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Move them nevative.

Gather a full log of LTFT data in the histogram in VCM Scanner with a min cell count of 100.. then multiply your VE table by % - half, then do some hand smoothing (very gentle)..

That should put you right there.
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Old Jan 10, 2007 | 03:04 PM
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If you're still in SD, then adjust the VE as Magnus mentioned.

If the MAF has been re-enabled, tweak it there. Just watch your STFT's/LTFT's averages vs. MAF Hz. You can usually see where the trouble spots are then. Make minor adjustments (1/2 corrections or less) based on the LTFT+STFT averages.

Example...
MAF Hz = 4,125
LTFT average = 1.1
STFT average = -0.2
N = 189 (make sure you have enough data)
STFT+LTFT = 0.9
Correction = multiply 4,125Hz cell by 0.9955 for 1/2 correction
(0.9% divided by 2 = 0.45% or .0045 >>> 1-.0045=.9955)
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