PE and VE table with the tunercats
10-17-2007, 06:06 PM
#1
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PE and VE table with the tunercats Hi, I need to know guys , If my PE table on my tunercats are directly in relationship with my VE. Cause my problem are this: PE multiplier are :
2000---1.125 AFR 12.3
2400---1.145 AFR 13.1
2800---1.205 AFR 13.9
3200---1.165 AFR 13.3
3600---1.105 AFR 13.0
4000---1.115 AFR 13.0
4400---1.125 AFR 13.1
4800---1.130 AFR 13.0
5200---1.075 AFR 13.1
5600---1.085 AFR 13.2
6000---1.095 AFR 13.3
I have read my AFR on my lm1 wideband of course. Does it possible that the VE table are off ,and that is for why my PE need to spike at some place here and there ? Can anyone help me. And pardon my english , I'm a french canadian !!!
2000---1.125 AFR 12.3
2400---1.145 AFR 13.1
2800---1.205 AFR 13.9
3200---1.165 AFR 13.3
3600---1.105 AFR 13.0
4000---1.115 AFR 13.0
4400---1.125 AFR 13.1
4800---1.130 AFR 13.0
5200---1.075 AFR 13.1
5600---1.085 AFR 13.2
6000---1.095 AFR 13.3
I have read my AFR on my lm1 wideband of course. Does it possible that the VE table are off ,and that is for why my PE need to spike at some place here and there ? Can anyone help me. And pardon my english , I'm a french canadian !!!
10-17-2007, 06:58 PM
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Do you have any idea why I should put 1.205 @ 2800 RPM and the AFR stay away lean instead of other RPM are near of my 13.1:1 commanded in my PE table (around 1.120)excepted for 5200, 5600 and 6000 too.
THX
Sébast
THX
Sébast
10-17-2007, 07:25 PM
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I have tuned just the PE table and the VE table to idle right cause for a V-6 , I have a some nice cam custom grind (224 -236) 112 LSA 112 ICL.
I have never scale the MAF and I don't know how to do this sorry.
Later,
Sébast
I have never scale the MAF and I don't know how to do this sorry.
Later,
Sébast
10-17-2007, 07:31 PM
#6
Are you tuning the VE table by disabling the maf? It can be done with tunercat software, though it is difficult. If you are trying to tune the VE table with the maf active, you are kinda fighting yourself. It is a tedious process with tunercat if you are not familiar with speed density tuning, and it sounds like you are not. Forgive me for sounding like an *******.
10-17-2007, 07:41 PM
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Oh yeah , for sure, I have disconect it an follow all the procedure on the tuning 101 and I put this tuning on the truck tomorrow . I'm not full hot on the tuning in SD but I understand !! lolll
I think with the tunercats, and my autotap, I can take some data to adjust the VE table right on at WOT (95-105KPA ) pretty easy. But at part of throttle that's an another fighting round !!!
Thx , later,
Sébast
I think with the tunercats, and my autotap, I can take some data to adjust the VE table right on at WOT (95-105KPA ) pretty easy. But at part of throttle that's an another fighting round !!!
Thx , later,
Sébast
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10-17-2007, 08:01 PM
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the answer to your question is 2 fold. One that camshaft is chaning air consumption and BSFC " brake specific Fuel consumption" between the overlap and the change in BSFC your wideband may be telling you anomolous things.
The right answer ?
There is no right or correct answer. The camshaft affect the BSFC curve of the engine. This will of course change the behavoir of the Pe enrichment. The best remedy in all honesty is to flatten the PE table and work the VE table leaving the MAF alone to deal with low throttle transient/wot behavoirs. Then you can use PE for WOT tunning which is what its intended to do.
I hope this helps if not I really can;t help any further.
The right answer ?
There is no right or correct answer. The camshaft affect the BSFC curve of the engine. This will of course change the behavoir of the Pe enrichment. The best remedy in all honesty is to flatten the PE table and work the VE table leaving the MAF alone to deal with low throttle transient/wot behavoirs. Then you can use PE for WOT tunning which is what its intended to do.
I hope this helps if not I really can;t help any further.
10-20-2007, 03:43 PM
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i just finised tuning my VE tables for my LT1 using tunercats. what exactly are you having trouble with. take a log of you caar and export it to excel. then look at the fuel trim percentages. you have to average these out and then adjust you VE table. let me know what your trying to do and i might be able to walk you through it.
10-20-2007, 07:15 PM
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Ok heres the update. I have unpluged the MAF, Tune the VE table between 95-105KPA @ 13.0 AFR from 1600-6500 RPM. Now I have decided to remove completly the MAF and O2 sensor and run in SD OL mode. I cruise at around 15,0 AFR, I have also tuned 15kpa-95kpa by take some data point here and there . The truck run fine and strong, better than with the sluggish MAF. Possibly, If i had rescaled it that would be resolve the problem, but I don't have the time. And so with the O2 removed, I could run leaded gas with the Nitrous, probably VP C-16 should be in the gas tank at the track.
Later, and thx guys forthe help, that would be very appreciate.
Sébast
Later, and thx guys forthe help, that would be very appreciate.
Sébast
