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Thread: Max power in lambda
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11-05-2010, 07:28 AM #1
- Join Date
- Oct 2010
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- Houston
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- 9
Black- 1998 WS6
Max power in lambda
WOT tuning
I am currently seeing .82 lambda on wideband @ WOT. I am in Oklahoma and put 91 octane 10% ethanol blend. 93 not available. I have read that gasoline with stoich of 14.7 :1 reaches max power a @ 12.5 : 1. I have also read that a 10% ethanol blend has a 14.2 stoich. I cannot find the max power ratio for this stoich. I love math, but trying to work through the lambda equation would have been easier about 10 years ago. My question is, What kind of reading am I looking for @ WOT on 91 oct 10% ethanol?
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11-05-2010, 08:03 AM #2
- Join Date
- Oct 2010
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- Houston
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- 9
Black- 1998 WS6
Did I just try to complicate something that is suppose to be the easier method? Its .85 still, right?
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11-05-2010, 11:28 AM #3
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- Apr 2007
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- Motor City
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- 6
The max power range will still be in the same general place in units of Lambda. You'll just be multiplying by a different reference AFR number (stoichiometry) for use with the new fuel. Like you said, don't overcomplicate it. If your engine ran best at lambda=0.82 before, I would start there with the new fuel as well.
Greg Banish
Calibrated Success, Inc.
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11-07-2010, 12:50 PM #4
- Join Date
- Oct 2010
- Location
- Houston
- Posts
- 9
Black- 1998 WS6
Thanks for the response. I leaned it up just a bit. Runs like a spotted ape. To the track in two weekends.
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11-07-2010, 02:37 PM #5
what he said lol
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