General Category > Quadrajet Carb Talk and Tips
Quality, reliable mechanical fuel pumps
Cadman-iac:
--- Quote from: tayto on September 23, 2025, 07:14:45 AM ---11:1 to 12:1 is WOT mixture territory. should be in the 13.5:1 to 14:1 for idle.
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That's what I thought, and I've adjusted the mixture to bring it up, but it seems to run better with a richer idle mixture.
Leaning it out at idle seems to have an effect on the cruise mixture from what I've noticed on my last long run.
I need to do some more tests to see if this is really the case, or if it was just my throttle position at the time.
That's why I asked about when the idle circuit stops affecting the main circuit, or does it continue to flow even with higher RPM's?
Do you want the idle circuit to work after the main circuit takes over?
I know they work simultaneously during the transition from idle to mains, but is there a point at which the idle circuit drops out?
I ask because if it is normal for the idle circuit to work well into the main circuit, then I know i need to compensate for it.
If it's not supposed to be working at say 2k RPM's, then I need to figure out why it is still flowing.
Does that make sense?
77cruiser:
11 to 12 is rich unless you are using gas with ethanol in it. Straight gas would be in the 12.5-13 range.
Cadman-iac:
--- Quote from: 77cruiser on September 24, 2025, 04:49:52 PM ---11 to 12 is rich unless you are using gas with ethanol in it. Straight gas would be in the 12.5-13 range.
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Yes, this is my daily driver, so I just run the ethanol fuel through it. At 10 to 12 mpg, ethanol free fuel is a bit pricey.
Cadman-iac:
--- Quote from: tayto on July 11, 2025, 07:29:43 AM --- In my square body I actually have the TBI running everything but the injection. sure is nice to change timing with a couple key strokes and then flash it to the ECM.
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So are you using the original distributor and coil and the ECM? How did you make it work without setting off codes for TBI faults?
tayto:
--- Quote from: Cadman-iac on October 03, 2025, 03:13:13 PM --- So are you using the original distributor and coil and the ECM? How did you make it work without setting off codes for TBI faults?
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i can turn off the codes that would trigger a check engine light in the calibration
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