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I was unaware of that, Barry - not too up on the
auto installation as I never owned an RX-7. Not certain how germane that
is to Tracy's EC2 set up, but I agree it would appear on the surface that
perhaps the Auto voltage/pressure is reduced to provide for leaner running at
idle. These are fairly large injectors compared to the size a lot of
engines use and that always makes getting the small amounts of fuel needed for
idle problematic.
Ed Anderson
----- Original Message -----
Sent: Tuesday, December 14, 2004 9:48
PM
Subject: [FlyRotary] Re: Injectors and
fuel pump pressure
Did you guys know that the 2nd generation turbo had some kind
of electronic gizmo in its circuit (help me out here, Ed Anderson) that
stepped down the voltage on the fuel pump at idle? I ran a voltmeter on my 87
Turbo's fuel pump for a while. I think at idle it was running about 9 volts
and then it jumped up to about 11.7 or so at WOT. So I think you're on the
right path, Steve. At least you're taking the same route the factory did with
its 550 cc injectors.
I used to know the fuel pressure readings that
corresponded to these different voltages but took my engine out of the car for
modifications about 18 months ago. If I find my records, I'll let you
know.
Barry Gardner
Wheaton, IL
Steve Brooks wrote:
One nagging problem that I have is the engine running rich at low power
levels. I've turned the fuel pressure regulator down to 30 lbs to get it
reasonably lean, but I still don't have enough adjustment. The higher power
levels have a pretty good mixture on the default tuning.
Right now I'm running the stock 550cc injectors, but I'm considering
changing the primary injectors to 440cc, to help the low end mixture, and
leave the secondaries at 550cc, so that I still get sufficient fuel flow
with the turbo at higher power settings.
My thinking is that the 440cc injectors would allow me turn the fuel
pressure back up to 38 lbs. and hopefully still be able to tune the lower
end where only the primary injectors are supplying fuel.
Does anyone have experience doing this, hopefully with a turbo, or just have
an opinion ?
Steve Brooks
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