Has anyone used the p port slide throttle with Tracy Cook's ECU?
After changing my engine to the P port configuration with the slide
throttle mounted close to the engine the  ECU does not work. There is no
good pick up point for the manifold pressure sensor hose. The hose
connected between the engine and slide throttle gets the rapidly
fluctuating impulses and also fills with fuel from the injectors.
Are there any engines running with this ECU and slide throttle set up ?

John Prendergast

Mark Supinski is trying as we speak. Any day now. We had it running on the dyno
but I ran out of dyno money before we got it tuned properly. The engine would start easily
and run but the mixture was all over the map..pardon the pun.

Since then Tracy has changed
the computer a lot. I suspect the problem may have been >>when<<< Tracy was sampling the
intake manifold pressure. He only takes one sample per rev so it is only a few
microseconds long. IMHO many samples should be taken and averaged. The same thing
might be possible by hooking up the two pressure taps, one from each rotor,
to a vacuum can to smooth out the pulses. Slide throttles don't give good
intake manifold pressure signals when they are wide open as there is little
pressure loss in the intake system. That is why they make more power.
All of Tracy development has been done with a plenum on the end of the tubes
sampling the pressure just after a single throttle body.

If your vacuum lines are filling with fuel something is wrong with where
they are mounted. We did not have that problem. Here is a picture of
our set up. Can you send some pictures of yours? Where are your injectors located?

You can also try the apex oil injector ports in the rotor housings for a place
to sample the intake vacuum... if any :)

Paul Lamar ...No rotor no motor.

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