FW: FW: FW: Electromotive FI

[Atkinson, David]

 ----------
From:  cloud
Sent:  Friday, April 18, 1997 7:49 AM
To:  David Atkinson; diy_efi
Subject:  Re: FW: FW: Electromotive FI

David, what is IOT and TOG (yeah, I'm too lazy to search
for the web site with all the "TLA's" .... thought maybe
you'd humor me and explain.

IOT=Idle Offset Time.  Used as an additive value to GAMA, which is the   
sum of all the enrichments at any given time.  IOT basically adjusts the   
fuel delivery at idle and low RPM conditions.
TOG=Time On Gama.  This is the time for one GAMA, calculated by   
determining how long any given injector may be on at redline for your   
particular engine, at 90% duty cycle.  There's a formula for this in the   
manual; I don't remember it offhand.  TOG is more important at high   
power, high RPM conditions.


I have the Holley ProJection analog (I think) setup.  It
uses only RPM and TPS (I assume you know what those acronyms
mean   ;-)    though it does have the ability to add EGO
feedback (which I may do -- though I really plan to
build another controller and continue to use the Holley
throttle body).  It works quite well, though I'm replacing
my engine with a new one with Ford MotorSport E-303 cam
and ported GT-40 heads (351W in a Bronco).  I am curious,
as you seem to be, as to why 'simple' efi systems are
said to not be able to work with hi-po engines.

RPM?  TPS?  what?   :-)


>Of course simply setting IOT and TOG on a high-revving, 'non-stifled'
>engine may not cut it but some tweaking is always necessary.  The TEC
>system can handle non-linearities by adjusting the values in the V.E.
>(Volumetric Efficiency) tables, so I don't see how this could be an
>issue.

Tom Cloud <cloud at peaches.ph.utexas.edu>