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proper air / fuel mixture?

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Old Sep 11, 2004 | 03:23 AM
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Default proper air / fuel mixture?

as title says, what is proper air / fuel mixture for c5? i have predator on the way, and like to play with it some, not messiing my vert..my mods are....

blackwing, kooks header w/ cats, stinger, & removed mesh grill maf..

since c5s are not lean burn engines, i assume it should be more than 12:1????? comments will be helpful..

thanks..

happy motoring
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Old Sep 11, 2004 | 06:17 AM
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When I had mine dyno tuned, the tuner was aiming for 13.0 to 1 (and he succeeded)
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Old Sep 11, 2004 | 08:30 AM
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I didn't think you could adjust your A/F ratio with a predator, I thought that was only possible with LS-1 edit or HP tuner
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Old Sep 11, 2004 | 10:00 AM
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TTT
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Old Sep 11, 2004 | 11:17 AM
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Originally Posted by Patman
When I had mine dyno tuned, the tuner was aiming for 13.0 to 1
- on a dyno, 13.0 to 1 is desired. Under load, you want it a bit richer. So... if you are going to use the real-time diags in the Predator, shoot for 12.7 or 12.8 to 1.
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Old Sep 11, 2004 | 11:36 AM
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Originally Posted by dkdonkim
as title says, what is proper air / fuel mixture for c5? i have predator on the way, and like to play with it some, not messiing my vert..my mods are....

blackwing, kooks header w/ cats, stinger, & removed mesh grill maf..

since c5s are not lean burn engines, i assume it should be more than 12:1????? comments will be helpful..
Had to pull out my Dyno sheet for this one...
Got mine to 11.9 where it flattens out at 4400RPM. Seems to start working down to this point at 3300RPM from almost 15. Could there be a problem with this set up? Car pulls strong with the I/C Mag
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Old Sep 11, 2004 | 11:43 AM
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Originally Posted by Dr. Dan
Had to pull out my Dyno sheet for this one...
Got mine to 11.9 where it flattens out at 4400RPM. Seems to start working down to this point at 3300RPM from almost 15. Could there be a problem with this set up? Car pulls strong with the I/C Mag
Thats the way it should look, you don't want a steady A/F ratio across the board otherwise you'll be pig rich on one end and extremely lean on the other instead your A/F ratio will change with load and RPM
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Old Sep 11, 2004 | 12:01 PM
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Originally Posted by runamuk
I didn't think you could adjust your A/F ratio with a predator, I thought that was only possible with LS-1 edit or HP tuner
you maybe correct..i will probably richen my c5 a bit, say 2% to 3%..i know my mixture now is right around 12 by ls1 edit graph..but never did ls1 tuning..just downloaded her stat..
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Old Sep 11, 2004 | 12:04 PM
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Originally Posted by Dr. Dan
Got mine to 11.9 where it flattens out at 4400RPM. Seems to start working down to this point at 3300RPM from almost 15. Could there be a problem with this set up? Car pulls strong with the I/C Mag
No - for an SC engine, I'm sure that is normal.
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Old Sep 11, 2004 | 12:18 PM
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I heard that 12.7:1 was the optimal air/fuel ratio, but I don't know if thats true.
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