If you are using some other computer that requires
a throttle position sensor here is one way of doing
it using a slide throttle.

This gives the computer additional information to make decisions
about the mixture required over and above RPM, MAP and air intake
temperature. One example is; you open the throttle on a go
around and the computer richens the mixture temporarily to
facilitate accelerating the engine RPM. Works just like
the accelerator pump in a carburetor. In a PICAXE there
are a couple of left over analog to digital inputs that
could be used for the throttle position sensor.

Yes it might be sensed without a throttle position sensor but
that would require (I think) measuring the rate of change in intake
manifold pressure. That takes more computer code and processing time.
The more data the computer has the better, easier and faster it can make
decisions.

Paul Lamar ...No rotor no motor.

Here's an off the shelf Piher linear slide POT as used in old sliding
AM/FM radios.
Useable travel is 2-3/8" with this one.  Got a few for a buck or two.
With a large PPort, the MAP signal may be weak/poor at low rpm.
(who made their PPort too big ;)
A throttle position sensor (TPS) would be useful for an Alpha-N tuning setup
(throttle position versus rpm).
It also provides another primary/backup sensor for a possible limp home
mode.
I haven't looked for a more "ruggedized" environment version.
Cheers
Cary


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