Alternative Fuels Discussion and Tech on using alternatives such as E85 or Hydrogen or other fuels and/or supplements to Gasoline in Rotary Engines

Another cornfed FD...

Old 06-17-09, 09:22 AM
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Another cornfed FD...

I've had my FD running on E-85 now for the last couple weeks but I have been unable to get it to idle properly. Hopefully someone on here can give me a hand with some tips to optimize my setup.

I'm running lucas/RC 120lb primaries and bosch 160lbs secondaries with an FJO injector driver on a 1/2 bridge motor. ECU is PFC

In can actually get the car started and it will idle anywhere above 1100 RPM but it is not the healthy brap brap brap that a 1/2 bridged rotary should make, it's more of a flat sounding "smooth" idle . Almost like i'm cruising at 1500 RPM

I've been trying diferent lag values but Ihaven't been able toget it right.

Any ideas?
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Old 06-18-09, 08:33 AM
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Originally Posted by ProjectD View Post
I've had my FD running on E-85 now for the last couple weeks but I have been unable to get it to idle properly. Hopefully someone on here can give me a hand with some tips to optimize my setup.

I'm running lucas/RC 120lb primaries and bosch 160lbs secondaries with an FJO injector driver on a 1/2 bridge motor. ECU is PFC

In can actually get the car started and it will idle anywhere above 1100 RPM but it is not the healthy brap brap brap that a 1/2 bridged rotary should make, it's more of a flat sounding "smooth" idle . Almost like i'm cruising at 1500 RPM

I've been trying diferent lag values but Ihaven't been able toget it right.

Any ideas?
It might be that your injectors are too good, so the spray is quite good. But try getting the idle up about 200 rpm and see what happens. What AF ratios are u running at idle?

I think i was running around 12-13 at idle, now mind i had a full bridge and idle at 1600-1700rpm

JT
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Old 06-18-09, 01:58 PM
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I have my idle set at 1500rpm. And as for my AFRs I can set them from as rich as mid 12s or as lean as 17s but the idle stays constant rather than the normal bridged "BRAP"

Currently my injector setting are:

Fp- 50 .40
.40
Rp- 50 .40
.40

With these settings I pulling about 10 inHg at 14-15 RPM
When I lower my lag values the motor will pull more vacume. Negative lag increases vacume even more. with values in the teens It pulls about 12-13 inHg.

However the idle STILL remains constant like i'm cruising with no sings of the eyebrow's Brap we all love to here.
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Old 06-18-09, 05:06 PM
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*hear
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