Thread: AFR and Jet size
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Old 08-28-2015, 06:11 AM
genolan genolan is offline
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Join Date: Sep 2013
Location: Sparta, nj
Cobra Make, Engine: Backdraft 1048
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Default AFR and Jet size
I had a friend hook his AFR gauge up to my 408CU stroker mild CAM with a 770 street avenger (Vacuum secondary) Primary jets 77 Secondary Jets 83 and got the following


AFR
Idle 14.0
WOT 12.5
Cruise 3k load 10.9

I assume I need to down size my primary jets but by how many Jet Sizes. How many Jet sizes will raise AFR by 1 full point. Will that affect my WOT by a percentage and if so approx how much, I will be able to use the gauge again but wanted to use some logic in jet selection.
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Gary
Backdraft 1048
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