I may have lost it here

[Shurvinton Bill (NET/Camberley)]

Aha. I had been trying to find out what an Alpha-N system was, but
couldn't find references. Marvellous. At this rate I will soon know
enough to be dangerous!

On Lotus derived cars we always tend to use this system because of the
IR TBi used and the high outputs, often over 100BHP/litre and revving to
silly levels. However, if like me, you are trying to prove that you can
use a scrappy ECM and save £500+ ($750USD) on an aftermarket unit it
adds to the fun!

Rgds

Bill

-----Original Message-----
From: ext Eric Fahlgren [mailto:efahl at adams.com]


Yes, Bill, this is called the alpha-N fuel metering algorithm (as
opposed to MAP-based speed density, or MAF).  The TPS is a relatively
crude, non-linear approximation of MAF, and is usually only used
for engines on which the vacuum signal is very difficult to detect
(i.e., those with huge cams), and of course can't be used on any
engines with turbo chargers (RPM and TPS don't tell you anything
about boost pressure).

-

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