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Thread: Stock ls4 tuning questions.

  1. 10-26-2012 #1
    Jason Austin
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    Stock ls4 tuning questions.

    Hello, just got my HPT and started scanning my engine. Engine may have old plugs and ill be performing a top clean shortly and changing the plugs.

    While scanning I noticed the NB o2s were 870-890 in PE. I'm getting a few degrees of kr at part throttle and at wot.

    Should I add to the Maff to get the o2s in the low 900s? Reason I ask is I used to have a supercharged Grand Prix and it always worked out best to run o2s in the 940 mv range in PE. Some day ill get a WB sensor but for now ill just have to use the stock NB.

    Thanks!
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  2. 10-26-2012 #2
    Jason Austin
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    Well did some more reading......looks like it's not even close when using NB o2 MV for a ballpark AFR.

    Looks like I will be purchasing a LC1 WB to really get it there.

    What's a good AFR for NA engines?
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  3. 10-27-2012 #3
    turbo 6l
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    12.5 to 13.0 afr
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