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Thread: help with afr's

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    pass1's Avatar
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    help with afr's

    Hi guy's!!First ride of the season with new setup, see sig for mods. Stock fuel pump. RRFPR set at 58 psi with engine running, boost line hooked to throttle body. Afr's at idle are around 13.8/14.2. At 5400rpm (0 psi vac/boost) afr's are at 13.5 and dropping gradually to 10.9/11.0 at WOT 8100rpm (13.5 psi). How can I get afr's a little richer at idle and leaner at WOT?


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    Eric Ocman's Avatar
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    Disconnect your boost line and try again.

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    imp0ster's Avatar
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    ^---yup it's a static map so the reference line will throw you off in one place or another.

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    Autism Speaks. Its Time To Listen gOt BoOsT's Avatar
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    imo idle is perfect and so is off boost cruise. like eric said, pull the vacuum line from the throttle body and that will lean out your wot. everything else will stay the same since you dont see vacuum at the throttle body anyway.

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    AtoMIC_OraNGE greenbullet's Avatar
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    begi regulator to pull or add fuel where you need too

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    Eric Ocman's Avatar
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    Quote Originally Posted by greenbullet View Post
    begi regulator to pull or add fuel where you need too
    Looking at his current afrs he does not need this. Disconnecting the ref line and maybe raising his base pressure a bit should be fine.

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    AtoMIC_OraNGE greenbullet's Avatar
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    Quote Originally Posted by Ocman View Post
    Quote Originally Posted by greenbullet View Post
    begi regulator to pull or add fuel where you need too
    Looking at his current afrs he does not need this. Disconnecting the ref line and maybe raising his base pressure a bit should be fine.
    true.. worth a try first.. i be you will need bigger injectors though in the colder air.... i ran 48s with my etech 137 and its similar to your xx wheel

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    pass1's Avatar
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    Quote Originally Posted by gOt BoOsT View Post
    imo idle is perfect and so is off boost cruise. like eric said, pull the vacuum line from the throttle body and that will lean out your wot. everything else will stay the same since you dont see vacuum at the throttle body anyway.
    So you are saying that from idle (14 afr) up to cruise rpm (5400rpm @ 0psi vac/boost) (13.5 afr) i'm safe??
    I guess that by disconnecting the reference line, the fuel pressure will stay at 58psi instead of going up at 71psi, that sould lean it out pretty good.
    What is the afr target at 13.5 psi of boost??

  9. #9
    pass1's Avatar
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    Quote Originally Posted by Ocman View Post
    Quote Originally Posted by greenbullet View Post
    begi regulator to pull or add fuel where you need too
    Looking at his current afrs he does not need this. Disconnecting the ref line and maybe raising his base pressure a bit should be fine.
    I guess the xx supercharger I will need a little bit more fuel that the stock x one

  10. #10
    Boost addict hotbird's Avatar
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    Quote Originally Posted by gOt BoOsT View Post
    What is the afr target at 13.5 psi of boost??
    I would say 12.2 is where you want to be at 13.5psi

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