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  1. #1
    !!!! wave jumper !!!! 05_RXP's Avatar
    Join Date
    Jul 2011
    Hamilton, Ontario

    injectors for mods

    hey guys i got a buddy with a 2007 rxp. external i/c x charger 4" rear air rrfpr, and wideband hes looking to run a et137 and just found a riva ecu for cheap. i know they call for 50s with the ecu but would bigger injectors be needed to run the et? or could one get away with even 48 bosch or accels? reason i ask also is because he has the ecu but not charger yet he may wait for the charger but doesnt want to buy multiple sets of injectors

  2. #2
    HardmanGT's Avatar
    Join Date
    Aug 2009
    Rutherfordton, NC
    48 Bosch and you can adjust fuel up or down with the RRFPR to suit your needs.He may find that he will need to run a lot less fuel pressure with the stock charger until he gets the ET. He can add pressure for the ET if he needs to.

    I run an XX with the Riva ECU and 48's right now.

  3. #3
    AtoMIC_OraNGE greenbullet's Avatar
    Join Date
    Jul 2010
    Barrie / BuckHORN Ontario
    48s drew... pressure down on the fuel

  4. #4
    monaroman76's Avatar
    Join Date
    Mar 2008
    Whyalla, South Australia
    +1. I think that the riva ecu and the et137 with 48# will be very close to correct afr. May just need to fine tune with a rrfpr.
    I'm running riva ecu with 48# and 2rude at about 48psi base pressure.

  5. #5
    skigolfnut's Avatar
    Join Date
    Jun 2009
    League City TX
    I run the et-137 wheel with the bosh #42's and I have the rotax racing ecu that was mapped for the #42's and it works great. My AFR's are good across the board, and I keep my reference line hooked up to the RRFPR,

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