I may have lost it here

[Eric Fahlgren]

bill.shurvinton at nokia.com wrote:

> PROVIDED that you chassis tune the ECU, MAF is a measure of load. You
> then look up fuelling as load vs RPM. Throttle position is also a
> measure of load. So, if it is a voltage output MAF (rather than a
> frequency output) you SHOULD be able to plumb the TPS into the MAF feed
> and off you go.

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).

-- 
Eric Fahlgren                            Mechanical Dynamics, Inc
efahl at adams.com                          Ann Arbor, Michigan, USA

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