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Join Date: Nov 2007
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AFR Tutorial, Please !!!

Hello,

I am in the process of installing, and learning how to use, an LM2 . . . what are the "good numbers" with regard to AFRs for idle, low RPM, midrange, WFO, etc ???

I know this has been discussed extensively in the past, but it is hard to put all this together via the search function (info scattered everywhere) . . .

Thank you !!!

Ronnie

Old 02-08-2009, 09:55 AM
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Well under full throttle, I would like to see 11.2-11.8 (depending on boost level and heat)
Under cruising, you may want 14.5- 15.5 or maybe a little more depending on load
Idle should be a less than cruising

Some people will argue these numbers, I always try to keep it fat under throttle and as lean as possible under crusing (better gas mileage, less oil contamonation, cleaner motor, less wearing)
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Old 02-08-2009, 03:28 PM
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I've asked similar questions but have only heard general answers so far. It would be great to see the perfect AFR curve on a chart.

A lean idle is said to be good, but above that I can only assume that 11.8 is ideal.
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Old 02-08-2009, 03:33 PM
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Quote:
Originally Posted by 930gt-40r View Post
well under full throttle, i would like to see 11.2-11.8 (depending on boost level and heat)
under cruising, you may want 14.5- 15.5 or maybe a little more depending on load
idle should be a less than cruising

some people will argue these numbers, i always try to keep it fat under throttle and as lean as possible under crusing (better gas mileage, less oil contamonation, cleaner motor, less wearing)
+1

Old 02-09-2009, 01:51 AM
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