whats the ideal AFR?

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Dec 4, 2007 | 11:31 PM

Disturbed Bird

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From: Savannah, GA

whats the ideal AFR?

what is the ideal AFR's for a n/a motor?

i thought it was 12.5 but looking at my dyno sheet from a couple of months ago it shows 13.0 and im making 450rwhp and 382rwtq. on just boltons and a cam with stock ls6 heads.

im about to get it retune as soon as i put the ported 90/90.

so back to my question.

what is the ideal AFR's for a n/a motor?

Last edited by Disturbed Bird; Dec 4, 2007 at 11:44 PM.

Dec 5, 2007 | 12:02 AM

MPHmotorsports

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13.0 is typicially the sweet spot.
Of course it can vary, but most cars run the best at 13.0 or somewhere in that range.

Dec 5, 2007 | 12:02 AM

Chris81

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It really depends on the motor combo, but generally in the 12.5-13.0 range.. sometimes a tad leaner.

Dec 5, 2007 | 12:02 AM

MPHmotorsports

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BTW nice ****

Dec 5, 2007 | 12:56 PM

Phil99vette

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I can usually find a couple hp from slightly richer @ peak tq and slightly leaner @ peak HP. Try to add some timing in both areas and watch the results.

Dec 5, 2007 | 05:28 PM

12secSS

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Quote:

Originally Posted by Phil99vette

I can usually find a couple hp from slightly richer @ peak tq and slightly leaner @ peak HP. Try to add some timing in both areas and watch the results.

I see the same results as Phil. Depending on the motor/setup, typically around 12.5 at peak TQ and between 13.0-13.2 at peak HP (some more radical setups will like a bit leaner).

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