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  1. #1
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    Optimal air/fuel ratios for stock and tuned 335is

    New guy question.....I am just starting a series of dyno runs with a pure stock 335is to get a base line this week. What is the ideal AFR for a stock engine + down pipes & a JB4 running map 2 when I install the new parts?
    Kevin
    2011 335is 7DCT/JB4 G5-ISO BMS Flash
    2013 135is 6MT - JB4 G5-ISO
    FF Cobra Mk-IV work in progress

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    Click here to enlarge Originally Posted by BEAR-AvHistory Click here to enlarge
    New guy question.....I am just starting a series of dyno runs with a pure stock 335is to get a base line this week. What is the ideal AFR for a stock engine + down pipes & a JB4 running map 2 when I install the new parts?
    Bump, let's see if @Terry@BMS can help you.

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    Click here to enlarge Originally Posted by BEAR-AvHistory Click here to enlarge
    New guy question.....I am just starting a series of dyno runs with a pure stock 335is to get a base line this week. What is the ideal AFR for a stock engine + down pipes & a JB4 running map 2 when I install the new parts?
    The basic AFR we target is around 13.8:1 tapering to 11.9:1 up top. That is the case for map 1 and map 2. From time to time we'll wind up a bit leaner down low in the lower boost region which is based on the fuel pressure mapping and fuel trims. We'll be making some tweaks there in the near future.

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    Thank you
    Kevin
    2011 335is 7DCT/JB4 G5-ISO BMS Flash
    2013 135is 6MT - JB4 G5-ISO
    FF Cobra Mk-IV work in progress

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