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Thread: afr

  1. #1
    warner0308's Avatar
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    afr

    Question, when adjusting afrs is there a point where fuel pressure is to low? I'm at 11.3/11.6 @42lbs should I lower fuel pressure more, or try smaller injectors? Et137 48lbs injectors 8100rpms thanks


  2. #2
    boost junkie skidoochris's Avatar
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    at 42psi your near the low limit for the injectors to work correctly
    your not that far off where I would run on pump gas
    you could try 40psi but they may/probably will act up
    the real fix would be a real fuel controller or re-flash like v-tech

  3. #3
    AtoMIC_OraNGE greenbullet's Avatar
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    Setup a begi like I used with that charger... How's it running?

  4. #4
    Fuel pressure in the rail should be at least 45-55 psi greater than the pressure in the intake at all times.

    AFRs should always be tuned with an ECU tuning device based on what you see on a data log.

    Andy

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    T, what was your base fuel pressure when you had the 42's in...wasn't it in the upper 60's?

    Its been warm the past few weeks, I bet it will lean out a little when the air cools off and the water gets colder...That should bring you raise the AFR a little...

  6. #6
    imp0ster's Avatar
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    45-50 psi then either CMD it or adjust it via flash.

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    I wouldn't count on the tunes being spot on. Had two now and both are off

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    warner0308's Avatar
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    Ya danny, it was up in the 60s, this is a cheap regulator and gauge!!!! Gauge probally not reading correct either! Greenbullet finally got it to some calm water. HOLLY SH.., you grab the gas and it rpms NOW!! MACHINE IS WAY QUICKER, not much mph increase. I was hopping for more mph than aceleration.

  9. #9
    AtoMIC_OraNGE greenbullet's Avatar
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    Quote Originally Posted by warner0308 View Post
    Ya danny, it was up in the 60s, this is a cheap regulator and gauge!!!! Gauge probally not reading correct either! Greenbullet finally got it to some calm water. HOLLY SH.., you grab the gas and it rpms NOW!! MACHINE IS WAY QUICKER, not much mph increase. I was hopping for more mph than aceleration.
    youll see about 1.5 mph from that wheel over stock at 8100 but more accell

  10. #10
    imp0ster's Avatar
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    Quote Originally Posted by thatdude596 View Post
    I wouldn't count on the tunes being spot on. Had two now and both are off
    map editor Super easy and if he ever adds the timing map for us I'll be totally self sufficient. Was supposed to be done two weeks ago I believe but still not there.

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