VE tables

[Ken Kelly]

When this thread started I was going to reply exactly as
stated below. This is certainly the theoretical answer. Last
night I even spent 2 hours adding the 4 VE vs load vs RPM
tables  to my LT1 editor.

	During my two hours of thought on implementing the tables I
began to question the logic of this answer. VE is certainly
the % Volumetric efficiency, and we would need to change it
for items like Cam changes or porting that would effect the
VE. The problem I have is that we also have a MAF on these
engines. We therefore have two independent measures of Air
Flow. Which one does What?? In a Speed Density or MAP based
system VE would be the only answer, but in a MAF system how
are these two independent figures used?

		Ken

Mike Pitts wrote:
> 
> An increase in VE requires an increase in fuel as a higher VE
> indicates more air flow (or a better ability to flow air).
> 
> A 100% VE means you are pumping 3800cc's of air every 720 degrees.
> 
> -Mike
> 
> -----Original Message-----
> From: owner-gmecm at esl.eng.ohio-state.edu
> [mailto:owner-gmecm at esl.eng.ohio-state.edu]On Behalf Of David A. Cooley
> Sent: Tuesday, May 18, 1999 9:16 AM
> To: DIY_EFI
> Cc: gmecm at efi332.eng.ohio-state.edu
> Subject: VE tables
> 
> I have a question...
> My 95 buick LeSabre basically uses the same code, but with different option
> bits set and different table values, as the Supercharged 3800V6.  The engine
> is using MAF and no MAP for air flow.  It has tons of MAF tables, but also
> has VE tables. (Engine efficiency VS RPM).  What effect do the values in the
> VE tables have if you change say 80% at some RPM to 95%?
> increase fuel delivered at that point or decrease it?
> Thanks,
> Dave