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Old 03-17-2010, 06:32 PM   #1
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A/F Ratios, whats best for all motor application...

what numbers should i want at WOT 13.2 for example... I use innovate and SCT to dial me in but i figured it would be nice to hear from someone with a focus not just any car... whats the best number for the best horsepower


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Old 03-17-2010, 07:12 PM   #2
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Well any one setup is different from the other but I asked this question a while ago

"safe" afr for high compression NA...

My motor runs happy at .875. At .882 it tends to knock a little easier at high ACT (over 90) and at .867 the butt dyno says im losing torque. But I cant actually tell you which is best for torque or power, never been to the dyno.
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Old 03-17-2010, 07:36 PM   #3
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Change spark timing then AFR. Spark will make power, AFR keeps it from knocking. If you get knock try adding a little fuel if you think the timing is right.

Least that's how I'd go about it.
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Old 03-17-2010, 07:39 PM   #4
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Good way to blow a motor.

There are two main things to be concerned with for knock:
1. heat
2. pressure

Adding fuel cools the cylinder (to a point). Advancing timing increases peak cylinder pressure and shifts the pressure vs. time curve to the left.

As you can see, timing and afr are a dance. If you are listening to the knock sensor, knock due to heat and knock due to pressure have distinct sounds.
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Old 03-17-2010, 07:53 PM   #5
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i know tom likes around 12.8-12.9 ish
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Old 03-19-2010, 03:01 AM   #6
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Thanks baseball for chimming in can always count on you... Well hopefully with my wideband o2's i should be able to dial her in nicely thanks brother
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Old 03-19-2010, 11:21 AM   #7
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I too run around 12.8-12.9 AFR on my Yellow SVT.
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Old 03-19-2010, 11:28 AM   #8
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In case anyone doesnt know wtf im talking about, .875 lambda is 14.64*.875= 12.81 afr.
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Old 03-19-2010, 11:31 AM   #9
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Originally Posted by illinipo View Post
In case anyone doesnt know wtf im talking about, .875 lambda is 14.64*.875= 12.81 afr.
That depends .. if he uses SCT then its in lamda, Diablo actually uses AFR.
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Old 03-19-2010, 11:34 AM   #10
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well yeah but generally speaking, .875 lambda is 12.81 afr for gasoline.
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