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  1. #1

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    Max Boost with Riva/Rotax 60#injec, walbro,race gas

    What is the max boost can you run with this set up and proper a/r with race gas. Is 25 pounds safe or do we need a different computer.


  2. #2
    R88ory RXP's Avatar
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    Gonna need sumin to control your fuel pressure as well. Your obviosly running turbo with that boost huh?? I would highly recomend the duel reg BEGi setup. Gives you real good control so that you can dial in your AF.

    Normaly you would wana shot for around the mid 11s at WOT but I dont know if race gas changes that.

    The rotax ECUs are real good for making power but run lean. I would think about a re-map from seadoo centre. Les can tailor maps to suit your mods. Also can set any rev limit you want.

    The MoTec ECUs that are coming will be real good im sure and they are fully mapable for large injectors but its prob gona be expensive. If you went this route you would not need the fuel regs as the ECU will do everything you want. Also the MoTec can do launch control and antilag ect ect. R88

  3. #3
    Having Fun jp1300r's Avatar
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    I don't think you can to do 25psi boost with 60lb injectors with any ecu or computer.

  4. #4

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    Quote Originally Posted by jp1300r View Post
    I don't think you can to do 25psi boost with 60lb injectors with any ecu or computer.
    That is for sure. 25psi takes 100lb injectors and 50 psi base fuel pressure with 1:1 rising rate reg.

    the motor will take it is the afr is right, and egt is kept below 1600f

  5. #5
    R88ory RXP's Avatar
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    Quote Originally Posted by Louis914 View Post
    That is for sure. 25psi takes 100lb injectors and 50 psi base fuel pressure with 1:1 rising rate reg.

    the motor will take it is the afr is right, and egt is kept below 1600f
    What ECU is that with Louis??? I know that 100 injectors and 50psi base on the stock ECU aint gona idle. But then why would you want 25psi on stock ecu. R88

  6. #6
    HighPSI's Avatar
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    You may be able to get away with it if you use high impedence 80# injectors. The stock MAP sensor won't read quite that high, but it shold be able to get it close with a fuel controller if you are making under 500hp.

    This is really getting into aftermarket ecu territory

  7. #7

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    if a/r is at 11.5-11.8 what egt will be that? Below 1600

  8. #8

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    Les Cook ECU

    Quote Originally Posted by Hecyan View Post
    What is the max boost can you run with this set up and proper a/r with race gas. Is 25 pounds safe or do we need a different computer.
    I ask Les Cook, close same questions. He tell me that With 60LB injectors Fuel reg 1:1 psi , I can run 225kpa max boost in air intake. You need know that normal air presser 100 kpa so you can us 225-100 kpa = 125 kpa = 1,25 BAR = 17,8 psi if you have walbro little more. But I think limit 19-21 psi.
    If you want run on closed course best choose Seadoo Centre ECU ( from Les Cook ) you can buy from MRRACING from forum. Or visit www.re-performance.se

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