Paul I have a new RX-7 friend that used to race p-ports, he said he
could get them to idle just as good as a carb by retarding the timing 20
+ degrees then would reset it for racing after he got his carbs
tuned. Is that something that Trace's system could be set up to do only
advance it so it would have a normal idle to WOT range. He did this
years ago when all he had was a stock Mazda electronic ignition. With an
electronic ignition like Tracy's this should be a peace of cake.

Allen Ervin


Paul what do you think about this?

Allen Ervin


Sounds like it would work. Talking Tracy into it might be another matter.

Paul Lamar

Hay just opens up more market for him. lol

Allen Ervin

Yes but it idles pretty good without retarding the ignition.

Paul Lamar

I talked to John this weekend and he also mentioned it stopped the fuel
blow back that p-ports have a problem with. John also showed me how he
did his p-ports using a stock intake manifold, I'll take some pic's next
time i get over there.
 Allen Ervin

What does he mean by fuel blow back?

Paul Lamar

When fuel blows back out of the Carb or Throttle body.
       
Allen Ervin.

That is interesting. Lots of engines blow back a fuel mist out of
the carbs or runners but I have never seen them do that at idle. IMHO It has to
do mostly with runner tuning I think but it could also have something to do
with valve overlap.  An air scoop or plenum must be used to capture this fuel
mist so don't let it blow around under the cowl randomly.

BTW Klause uses TDC timing on his Light Speed ignition system as it
makes the engine easier to hand prop.

Paul Lamar

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