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  1. #1
    Sayers's Avatar
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    Tuning RRFPR to correct AFR's

    I'm having trouble getting my AFR's correct and would love some advice.

    I know I should be shooting for around:
    12.5 Idle
    13 mid.
    11.7 - 11.9 WOT (not over 12).

    I have my reg at 37psi and am still running 11.5 WOT, little rich. At 37psi static I am seeing 13 idle and 13.6 mid, is this still safe for idle and mid? If I run 40-42psi static my idle and mid are perfect but WOT is 11, and I lose RPM.

    obviously the more I screw the static down to get my WOT at a sweeter spot the leaner idle and mid is getting.
    Is there any way I can get it balanced better? Or is my only option to go for something like the Rude controller?

    Mods are in my sig. I'm running a full return system and Aeromotive 13129 RRFPR. Seeing 12psi only out of my C-kit as the slip is at 5ft lbs (waiting on new shaft tool to replace spring washers).


  2. #2
    Eric Ocman's Avatar
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    What injectors?
    The main purpose of a simple rrfpr is to add fuel on top.
    Those afrs look good to me.

  3. #3
    Eastside Powersports Slow 91's Avatar
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    you wont be able to tune idle unless you have a Rude Controller. 13's are fine idle and cruising and your WOT looks mint.

  4. #4
    R88ory RXP's Avatar
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    I personaly like to be in the mid 13s at idle, makes it nice and snappy, Untill your engine is under boost its effectively acting as a NA engine so 14 would be ok at idle but you wont be able to go that lean coz it will stutter when blipping the throttle.

    13 falling to 12 from 4000-7000.

    Then under 12 WOT is safe and makes good power.

    I had some real issues getting my AFR correct throughout the rev range when I was running x charger on stock ECU with 42s, needed a lot of pressure to make it safe ontop and like 35psi to make idle good.

    You have 2 good options, either a electronic fuel tuner like the rude although other options are availible if you can do some wiring. Or and TBH I wish I stayed with this setup get a BEGi 2025 FMU it can vary the fuel pressure alot from idle to WOT and its all adjustable so you can get your AFR perfect from top to bottom.

    You would still need the reg you have now as that controls the Idle fuel pressure so you turn that up or down to get Idle as you want it. Then the BEGi FMU goes in the return line to the tank and is controled by the boost line. There is a good bit of info on here about the BEGi do a search, I really liked it and a few others have run them. Maybe a good option for you to get it all correct.

    R88

  5. #5
    Sayers's Avatar
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    Quote Originally Posted by Ocman View Post
    What injectors?
    The main purpose of a simple rrfpr is to add fuel on top.
    Those afrs look good to me.
    Bosch flow matched 48's. so high 13's in mid is OK?

  6. #6
    Eric Ocman's Avatar
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    Quote Originally Posted by Sayers View Post
    Bosch flow matched 48's. so high 13's in mid is OK?
    IMO yes bro.

  7. #7
    Sayers's Avatar
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    Quote Originally Posted by Slow 91 View Post
    you wont be able to tune idle unless you have a Rude Controller. 13's are fine idle and cruising and your WOT looks mint.
    That makes perfect sense, and what I thought, but my AFR is shifting at idle when I screw the reg up or down.

  8. #8
    Eric Ocman's Avatar
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    You can also use dual stage rrfprs like a begi to tune idle and mid but imo your fine. Call it good and ride!

  9. #9
    Sayers's Avatar
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    Thanks Rory, Ocman, Slow. I feel much better about it now. Its 40 deg C (104F) this weekend so heading for some cool ocean water.

  10. #10
    Mod less, ride more! troyheb's Avatar
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    Do you have the reference line connected?

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