SESTP VE table ?
Outstanding HDF Member
Joined: Apr 2006
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Volumetric Efficiency (VE) Front and Rear Cylinders – The VE Tables tell the ECM the air
flow efficiency of each cylinder in percent. This table charts VE percent vs. throttle position
(TPS) and engine RPM.
o Increases raise the VE, implying there is more air entering the cylinder.
o Decreases lower the VE, implying there is less air entering the cylinder.
More AIR, more FUEL.....
Less AIR, less FUEL....
This information can be located in the SERT/SEST Users Manual....
flow efficiency of each cylinder in percent. This table charts VE percent vs. throttle position
(TPS) and engine RPM.
o Increases raise the VE, implying there is more air entering the cylinder.
o Decreases lower the VE, implying there is less air entering the cylinder.
More AIR, more FUEL.....
Less AIR, less FUEL....
This information can be located in the SERT/SEST Users Manual....
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Road Master
Joined: Jul 2007
Posts: 786
Likes: 4
From: Beech Island, SC
Thanks for the response. I was not sure if there was additional fuel from the VE telling the ecm it is getting more air. I did not get a manual only the help section that was on cd an does not give a clear to me explanation on the VE table.
Road Master
Joined: Nov 2007
Posts: 1,223
Likes: 3
From: Peoria, AZ
VE Tables
Unless you're having it dyno tuned with AFR sniffer, I would not mess with it and stick with the base map. You're guessing as to what AFR you are setting vice "tuning it" and will probably end up with something all over the board in HP, torque, and esp. AFR. Setting a number does not automatically mean you will GET that number; it can either be too rich or too lean in actual operation. To use the VE tables (listed in percent), you have to know the actual dyno AFR (or your "have") then figure what you actually need (or your "want"). If your "have" is less than your "want", you "increment" that number in the 2 units selection at right top and vice versa. For example, if you are running 14.5 (lean) on the AFR and you want 13.2, the difference is +13 clicks on the increment button. If you have 12.8 (rich) on the AFR and you want 13.2, the difference is -4 clicks on the decrement button. I use 13.2-13.5 as my baseline operating "want" which gives great numbers & driveability. After doing both cylinders, you can compare by going to "edits to reference" to check for same numbers since it sometimes doesn't "click" as much as you do on the mouse. The colors on the graph will give you the status: green=cannot increment, red=cannot decrement, and blue=indicates a value change. Then dyno again to verify results. Hope this makes sense but it's how I learned it at school.
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sanaga
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Oct 30, 2007 09:51 PM
