# PCM Diagnostics & Tuning - Any programs to calculate base VE

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Phil99vette
09-04-2007, 02:07 PM
Anyone know of a program or tried http://www.megamanual.com/v22manual/vetable.htm to calculate your base VE table?
Phil

ALLBOTTLE
09-04-2007, 02:33 PM
Phil,

You can Only Assume a value for VE. There are to many variable to come up with an actual formula, it has to do with chamber design, bore, valve placement, flame propagation.

I would make all my calculations based on a 100% VE value. That will give you a bassis to tune. If you come up that mathematically your IPW will be 4.2ms at 3000rpm & 100kpa to acheive a 12.5 afr, you run the car and findout that in reality your AFR is 12.2 that means that your actual VE at that rpm and load is ~97.

Am i making sense?

If not let me know i have a great Tunning Manual from a seminar i can Scan and PDF to you.

Phil99vette
09-04-2007, 02:53 PM
Phil,

You can Only Assume a value for VE. There are to many variable to come up with an actual formula, it has to do with chamber design, bore, valve placement, flame propagation.

I would make all my calculations based on a 100% VE value. That will give you a bassis to tune. If you come up that mathematically your IPW will be 4.2ms at 3000rpm & 100kpa to acheive a 12.5 afr, you run the car and findout that in reality your AFR is 12.2 that means that your actual VE at that rpm and load is ~97.

Am i making sense?

If not let me know i have a great Tunning Manual from a seminar i can Scan and PDF to you.

The PDF file would be great. I am trying to figure out how to build a base VE to use to start my new engine. If you could send the file my email is phillip_eclipse@hotmail.com

edcmat-l1
09-04-2007, 03:05 PM
Hey, Phil
Does the BS3 not have a system configuration in it? The others do. You enter CID, valve size, intake runner length (ACCEL DFI) and some other shtuff, and it sets up a basic table for you.

Phil99vette
09-04-2007, 04:40 PM
AFAIK The BS3 does not have that but I could be wrong. You do setup CID, Valve, and the other stuff but I don't know if it autopopulates a ve table.
Phil

edcmat-l1
09-04-2007, 05:21 PM
AFAIK The BS3 does not have that but I could be wrong. You do setup CID, Valve, and the other stuff but I don't know if it autopopulates a ve table.
Phil
Pretty sure thats what its for. Sets your baseline to work from. Not familiar with BS3, but all the other aftermarket systems I've done have some sort of cofig table/page to get your VE table baseline, so it'll start.