>
         > Paul,
         > I know you and others are working on alternatives to feed
   the P Port
         > slide throttle.  Tracy's ECU works on MAP and because of the
        pulsations
         > and short intake this will not work.  Mazda stock ECU has TPS
        could this
         > work with a re-programed or adjustable ECU offered by these
   folks?
         > http://www.turnerdr.com/products.asp?cat=100
         >
         > Joe Berki
         > Limo EZ
         >
         > Well the jury is still out. Mark Suspinski p-port engine
   seems to be
        working
         > fine on the ground with Tracy ECU.
         >
         > I think these are stock units that are upgraded.
         > Perry Mick has a stock unit working fine. He had to trick a few
         > sensor inputs as I recall. Last I heard he was still working
   on the
        leaning circuit.
         >
         > It uses a stock mass air flow sensor that looks like this.
         >
         > I am looking for somebody that is close to flying to test my
        mechanical
         > EFI.
         >
         > Paul Lamar

        Paul.
        Did you check out the stage 2 version?  It is fully adjustable via
        PDA and
        their software.

        Joe

        No I did not but that is interesting. I think Perry might be
   interested
        in that. Can they lean it in an easy manner?
        --
        Paul Lamar ...No rotor no motor.



   Aren't there multiple generations of factory ECU's?  I'd guess that
   different years might have different behaviors.  Especially the gen3
   cars..

   If my computer had a limp home mode, I'd test it on the ground at least
   once..  Figure out a way to reliably cause it - disconnect a sensor, add
   a switch, whatever.  Run up to 2000RPM, turn it on and see how it does.
   Cool, reset, and increase the power setting for the test point.  Keep
   doing that until you are at essentially cruise power.  Assuming that
   running the experiments at lower power settings doesn't cause anything
   seriously bad to happen..

   Is limp-home reset on power-cycling the ECU?


   Regards,

   Matt-

   The 2nd gen is most common and probably by far the cheapest to be
   had in junkyards
   or on ebay. It will work on any generation engine.

   It is kind of easy to simulate a 2nd gen mass air flow sensor as all
   it is
   is a spring loaded trap door connected to a pot. One could hook a
   large pot
   in parallel and try twisting it if one suspected the mass air flow
   sensor
   failed. In other words all it does is a supply a zero to 5 volt signal
   to the ECU. Same goes for the throttle position sensor.


   Paul Lamar ...No rotor no motor.



I am just interested in seeing how well the engine runs when in
limp-home mode - if there's any chance that it might happen while I am
flying the airplane.  Perry told us the minimum power requirement for
level flight (at some weight and altitude?).  I want to know if I get
that much power in limp home..

It's also worth considering what the failure mode is for each sensor
circuit.  It seems likely that the leads the sensor will fail either
short or open, while a functioning sensor might rarely (never) produce
readings that look like a short or open.  Either of those conditions
should be easy to detect.  Similarly, at least one fail mode for a pot
is open circuit on the wiper.  Easy to detect.  So, unplugging the
sensor might be a way to convince the computer that it should limp
home.  Other sensors might have similarly easily detectable fail
conditions.



Regards,

Matt-

The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net
Copyright 1998-2007 All world wide rights reserved.