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  1. #1
    cjo632racing's Avatar
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    Mid-range AFRs ?

    My mid-range is at 13.0-13.5, and my wot is at 10.9. If I lower the fuel pressure with my RRFPR will that make my mid-range more lean? Is that safe?


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    Mod less, ride more! troyheb's Avatar
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    Do you have the reference line hooked up?

  3. #3
    Having Fun jp1300r's Avatar
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    Quote Originally Posted by cjo632racing View Post
    My mid-range is at 13.0-13.5, and my wot is at 10.9. If I lower the fuel pressure with my RRFPR will that make my mid-range more lean? Is that safe?
    What ecu? Are you running a boost line?

  4. #4
    cjo632racing's Avatar
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    stock ECU. My boost line is from the throttle body to the RRFPR. I am waiting for a brass fitting to plug into the manifold.

  5. #5
    Having Fun jp1300r's Avatar
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    You may want to just adjust pressure for WOT without the boost line. Don't hook the boost line up, plug it. Check your AFRs.

  6. #6
    Duke's Avatar
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    Quote Originally Posted by cjo632racing View Post
    stock ECU. My boost line is from the throttle body to the RRFPR. I am waiting for a brass fitting to plug into the manifold.
    Is hole open now??

    Quote Originally Posted by jp1300r View Post
    You may want to just adjust pressure for WOT without the boost line. Don't hook the boost line up, plug it. Check your AFRs.
    +1

  7. #7
    cjo632racing's Avatar
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    [QUOTE=Duke;1645770]Is hole open now??
    no

    Could there be more boost in the throttle body than the manifold? If I move the boost line from the throttle body to the manifold would that make a difference?

    Its a Riva RRFPR should I just disconnect the boost line and cap off both ends? Or put the supplied vent in the RRFPR and cap off the boost line on the throttle body.

  8. #8
    Eric Ocman's Avatar
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    Cap both ends. Boost is theoretically the same at either location however vacuum is only present in the manifold.

  9. #9
    Duke's Avatar
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    Quote Originally Posted by Ocman View Post
    Cap both ends. Boost is theoretically the same at either location however vacuum is only present in the manifold.
    Like Eric said, the only real difference is vacuum. The manifold reference will pull the regulator down resulting in even leaner conditions at idle or cruise when motor is not seeing boost there. The TB reference will always see boost.

  10. #10
    cjo632racing's Avatar
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    Quote Originally Posted by Duke View Post
    Like Eric said, the only real difference is vacuum. The manifold reference will pull the regulator down resulting in even leaner conditions at idle or cruise when motor is not seeing boost there. The TB reference will always see boost.
    It is around 11.0 at idle its only lean at mid-range

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