PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

How slow does the ve table move

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Old Jul 7, 2004 | 01:02 PM
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Default How slow does the ve table move

How much of an adjustemnt do i have to make to it to get my Trims to move. I am on my fifth pass and they seem to be getting a LITTLE better but not where i want them.
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Old Jul 7, 2004 | 07:36 PM
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I started by adjusting the entire amount of the LTRIMs based on histograms. It started getting me REAL close to 0, but not quite dead-on. First though, I did not give it enough time to relearn, which the computer will need to do. Second, the next time I tune using this (after my LTRIMs are relearned) I am going to subtract the LTRIM and 1 (so if the LTRIM is 10, subtract 11) for positives, and the LTRIM minus one for negatives (if LTRIM is -10, add 9), that way I can shoot slightly rich. The VE table won't move, but you are going to move the VE table with the LTRIMs. I have done this to fix low-end drivability so far without using the 60/80/90 method on the VE table. It is much more accurate. What I have been seeing is that a lot of the table after the cam is near 85% of the original value at low vacuum/RPM (based on 90% of my IFR table...so now it is going to change, more than likely towards 75%).

I actually saw mine move in one drive about 1/2 to 2/3 the distance I changed. I don't know exactly how far it would have gone. One thing I have also been pondering is that adjacent cells will affect any surrounding, so it will take awhile. If you overshoot, just go back and add a little back in.
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Old Jul 7, 2004 | 09:10 PM
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Originally Posted by HumpinSS
How much of an adjustemnt do i have to make to it to get my Trims to move. I am on my fifth pass and they seem to be getting a LITTLE better but not where i want them.
HumpinSS - each time you flash the PCM the LTFTs should reset to zero. BUT the AIRMASS/AIRFLOW calculations seem to be stored in the PCM and don't reset with a flash. So pull the PCM fuses for about 2 minutes to clear this info. Pulling and replugging the fuses after 30 secs wasn't long enough with my car. When I did testing, of the VE calcs, with NoGo the stored values effected the AFR -> NoGo had me pull the fuses ( he is THE MAN! ) and the results were immediately different. FWIW.

joel
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Old Jul 7, 2004 | 09:35 PM
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To much with this tunning I will keep trying until i get it RIGHT and the car runs like a raped ape.
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