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  1. #1
    pass1's Avatar
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    Need advice fot tuning my afr's

    Hi Guy's.

    Went for my first ride of the season yesterday. I have done some mods over the winter and now need to tune my afr's.
    After a good warmup here is my situation:
    Idle: 11.5 to 12.0 (runs good, no vibration, no sputters or hesitation on hard take off)
    From idle to 5500 it goes from that 12 to around 13.5 (at 5500).
    Boost kicks in at 5500 (basicaly 0 psi at 5500), then from 5500 to 8100 is goes down from 13.5 (5500) to 10.9 (8100).

    So I need to lean my idle and WOT, I understand that I shoud drop base pressure to get to around 11.9 (idealy) but I'm affraid that by doing so I will also lean out mid range and it is already lean enough like that. What are my options??

    My setup.
    2008 GTX 215.
    stock 215hp ecu.
    x-charger with A kit (11.5 psi seen on gauge at 8100)
    bosh 42# injectors.
    xs external intercooler
    riva rrfpr set at 56 psi base pressure with boost line attached to intercooler block off.
    4'' fizzle front intake with filter.
    solas 15/20r (need to be pitched cause hitting limiter really easy... about at ¾ throttle).
    2° riva wedge.

    Thanks.


  2. #2
    iron head's Avatar
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    Quote Originally Posted by pass1 View Post
    Hi Guy's.

    Went for my first ride of the season yesterday. I have done some mods over the winter and now need to tune my afr's.
    After a good warmup here is my situation:
    Idle: 11.5 to 12.0 (runs good, no vibration, no sputters or hesitation on hard take off)
    From idle to 5500 it goes from that 12 to around 13.5 (at 5500).
    Boost kicks in at 5500 (basicaly 0 psi at 5500), then from 5500 to 8100 is goes down from 13.5 (5500) to 10.9 (8100).

    So I need to lean my idle and WOT, I understand that I shoud drop base pressure to get to around 11.9 (idealy) but I'm affraid that by doing so I will also lean out mid range and it is already lean enough like that. What are my options??

    My setup.
    2008 GTX 215.
    stock 215hp ecu.
    x-charger with A kit (11.5 psi seen on gauge at 8100)
    bosh 42# injectors.
    xs external intercooler
    riva rrfpr set at 56 psi base pressure with boost line attached to intercooler block off.
    4'' fizzle front intake with filter.
    solas 15/20r (need to be pitched cause hitting limiter really easy... about at ¾ throttle).
    2° riva wedge.

    Thanks.
    I would unhook the boost line set base psi to 60

  3. #3
    Bob 1tommygunner1927's Avatar
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    Lower your fuel pressure in 2 pound incriments......idle and cruise may change very slightly, but WOT pressure needs to be approximately 11.9. Richer is slower.....

  4. #4
    waseemyah's Avatar
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    I hate tuning AFRs with RRFPR so far I have not figured out mine, it takes lots of time

  5. #5
    monaroman76's Avatar
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    I'd go ahead and drop the base pressure some more.. It won't matter if your mid range leans out some more, as long as it comes down when your on boost.

  6. #6
    Bob 1tommygunner1927's Avatar
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    Quote Originally Posted by waseemyah View Post
    I hate tuning AFRs with RRFPR so far I have not figured out mine, it takes lots of time
    Same here.....but until I can datalog the A/F's it seems about every 10 degrees of air temp a 2+ psi adjustment works fairly well......at least on my ski it does.

  7. #7
    Mothman's Avatar
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    14-low 14's <5500 cruising is fine. You're leaving considerable power on the table with that 10.9 up top. Try 52-53 as a base. Good luck!

  8. #8
    mac_man_luke's Avatar
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    Id consider removing the boost line, this will straightaway clean up your WOT without affecting your mid (and idle will lean out slightly due to no vac pull on the FPR)

  9. #9
    pass1's Avatar
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    Did not knew that rrfpr was pulling fuel when under vacuum?? Taught it was only adding some when under boost.

  10. #10
    boost junkie skidoochris's Avatar
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    put a T in the boost line with a check valve to bleed off all the boost and will shut for vac.

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