efi&mpg readout possible?

[Huw Powell]

> I also thought about this a while back. That potentiometer, doesn't it
> only read how high the plate has travelled in the metering head?

Yes

> Would this perhaps not be related to air consumed

It is exactly related to air consumed.  Don't know if it a linear
relationship, a simple formula, or a series of different relationships,
though.

 >, which could be similar to
> the manifold pressure? When it comes time to do this on my 200t I will
> simply be wiring up the MAP sensor to replace the potentiometer signal
> and then just see what happens. Then maybe trying using the throttle pot
> as well, otherwise to hell with it. I only used to get about 300 miles
> out of a tank (18 gallon?). :P

You should be able, somehow, to calculate the "potentiometer value" from
maniofl pressure and throttle opening, yes.  I would be tempted to use
the trip comuter for something more mundane (like the clock) and worry
about fuel economy on a tank-to-tank basis, though.

--
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/