A question on EFI theory

Fri Jul 4 14:24:44 GMT 1997

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Mark,
	I am not familiar with the Whipple supercharger, but I would guess its =
performance characteristics to be the same as any positive displacement =
type supercharger (correct me if I am wrong).  If you look in John =
Heywood's book "Internal Combustion Engine Fundamentals" on page 258 you =
will find a performance map of a roots blower as well as the equation =
relating volumetric efficiency to several other parameters.  The figure =
in the book indicates that, knowing the mass flow rate (i.e. throttle =
position), the rpm, and the upstream pressure for the supercharger, you =
have a known output pressure from the supercharger.  Thus it should be =
no problem to calibrate for the system you mentioned.  This is simple =
theory, and you may find with some experience that things are not quite =
so simple, but if you designed your own system any other problems should =
not be hard to overcome.

Good Luck,

Jim Boughton
boughton at bignet.net

----------
From: 	Mark Eidson[SMTP:Mark_Eidson at ccm.ch.intel.com]
Sent: 	Wednesday, July 02, 1997 8:52 AM
To: 	DIY_EFI at coulomb.eng.ohio-state.edu
Subject: 	A question on EFI theory

Text item:=20

If one were to design a system from scratch and have complete control =
over fuel=20
maps, etc., could a system be made that measured the MAP between the =
throttle=20
body and supercharger rather than at the intake manifold?  Could the =
fuel map be
designed to compensate for the increased volumetric efficency of the=20
supercharger at a given RPM and MAP? =20

Putting it another way could I use my Holley 4di throttle body on a =
Whipple=20
supercharger on a small block chevy with the MAP and vacuum taken off =
the=20
throttle body port rather than the intake manifold?

Thanks, me.

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