A question on EFI theory
Mark Eidson
Mark_Eidson at ccm.ch.intel.com
Tue Jul 8 23:08:21 GMT 1997
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Thanks Jim,
The Whipple is a positive displacement type supercharger and you have
confirmed my thinking. Thinking about it some more having the MAP
sensor between the throttle body and a turbo inlet probably would not
work because the turbo's output pressure is not known at a given engine
RPM. me
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Subject: RE: A question on EFI theory
Author: owner-diy_efi-outgoing at coulomb.eng.ohio-state.edu at SMTPGATE
Date: 7/4/97 10:18 AM
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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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Date: Fri, 4 Jul 1997 10:18:33 -0400
Subject: RE: A question on EFI theory
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