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Thread: 42Lbs Injectors

  1. #1
    ramnj's Avatar
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    42Lbs Injectors

    Installed them last weekend and lost approximately 4 MPH.

    With the 38Lbs injectors my ski was a solid 77-78MPH (in 88 degree water temps). With the 42Lbs injectors it now runs in the 74MPH range (in 55-57 degree water temps).

    Has anybody else had this problem with the 42Lbs injectors?


  2. #2
    ROTAX RACING performance
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    whats your setup ?

    RR SC Imp. ?

  3. #3
    ramnj's Avatar
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    Quote Originally Posted by mrracing View Post
    whats your setup ?

    RR SC Imp. ?
    RR ECU (Rec)
    RR Engine Mount
    RR S/C Impeller
    Riva Thermostat
    Riva Thru-Hull
    Riva Intake Grate
    Riva Wedge
    Crankcase Breather/Catch-Can
    PPG 3" Air Intake Extension thru Tunnel (Under glove box)
    RR Intercooler
    Solas 15/20
    SS Wear Ring
    Les's S/C Washers
    RPM's are solid 8440/8460

    Only thing that changed were the injectors.
    Last edited by ramnj; 10-22-2006 at 04:14 PM.

  4. #4
    oklagp1200r's Avatar
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    Now thats def a good question!

  5. #5
    ramnj's Avatar
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    I understand that the 42Lbs injectors will make it run with more fuel, but I was just wondering if anybody else has had the same issue when they installed the 42Lbs injectors.

  6. #6
    ABBOTT's Avatar
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    with bigger injectors, is it possible that you are losing some fuel pressure because the fuel is flowing differently???? I wonder if it made it run lean?

    Just a thought. I don't know much about RXP's fuel delivery process but it sounds like the engine became thirsty with the new injectors.

  7. #7
    Got Boost? psycho rxp's Avatar
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    If you just installed the RR sc wheel, and the injectors, you will need a larger air intake like a homemade 4". You should gain more rpms, and maybe even need a repitch. Also time to check the slip moment on your clutches,it may need a shim. More boost will cause more slippage.

  8. #8
    Site Admin Green Hulk's Avatar
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    Rafi, i have never heard of this happening before. Did you put the stock injectors back in to see if the speed came back?

    Did the RPM's change?

  9. #9
    Site Admin Green Hulk's Avatar
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    Oh, i just saw that your RPM's didn't change. If the RPM's didn't change then i seriously doubt the injectors were the cause of your speed loss.

    Did you look under your ski to make sure the back of the grate wasn't hanging down? (pulled out)

  10. #10
    ramnj's Avatar
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    Quote Originally Posted by Green Hulk View Post
    Oh, i just saw that your RPM's didn't change. If the RPM's didn't change then i seriously doubt the injectors were the cause of your speed loss.

    Did you look under your ski to make sure the back of the grate wasn't hanging down? (pulled out)
    I haven't checked. I'll let you know after I check it.

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