An old idea but there has been some recent developments
thatmight make it work. The idea is to measure the EGT
and use that to adjust the mixture.

The computer can increase the mixture and check the EGT.
If the EGT goes up your EFI system is on the rich side
of the EGT verses mixture curve. See the attached JPG.

If the EGT goes down your system is on the lean side
of the curve. It takes a few minutes to do this as the
EGT probes are not very fast.

It is easy to program this situation in BASICas once
the computer knows what side of the curve it is on
it can tune for minimum fuel burn or max power.

There needs to be a button on the instrument panel
telling the computeryou want to lean for max MPG.
Call it the leaning button. The default is maxpower.
If you push the throttle all the way in it can go
back to max power using a micro switch.

Here is a circuit that will put out 5 millivolts per degree
C. Feed it into the ARM A to D pin.

Paul Lamar


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