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How to SAFELY reduce AFRs for wot?

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onefast2gdsm

15+ Year Contributor
866
6
Aug 30, 2010
millersburg, Pennsylvania
My afr at wot is 10:1. I would like it to be around 11:1, but how would I do this safely without the motor going bang, LOL. Obviously, I'm new to this, and I believe I'm either getting phantom or rich knock around 3k rpm. I'll post two logs to go with.



10/19 log was me first trying to dial in wot, then realized my afr wasnt where I wanted it.
 

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10:1 is usually the richest a wideband will read, It could be richer. I wouldn't drive it that much as you risk washing the rings and filling the crankcase with gasoline.
 
Who tuned the car previously? In order to lean out a bit, you'll need to change your OpenLoopMacOct table to reflect your intended afr. I threw a picture of one below (leaned out to 10.5).

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...and that's what sucks about UEGO's. Either way, the factory map targets mid 9's for AFR's. Yours is showing 10.0 for most of the pull. Is this correct or are you richer? ...you don't know yet since your DA table is targeting 10-10.2... Lean it out a little and see how it changes.
 

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This is a fresh build and I was the only one to touch the tuning. This is my first car ever built by me, and I wanted to do the tuning myself. I will lean the table out, and see what I come up with. Thanks guys I appreciate the help
 
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