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  1. #1
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    nitro

    05 rxp with all the goods 50 shot of nos having problem hitting rev limiter
    I have the rotax racing ecu been to ppg anyone have any ideas


    thanks


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    Engines Boosted by nitrous oxide require special consideration to be a successful application.

    You cant take a “normal” set-up and spray and go.

    Nox Motors when on spray produce instant HP. YOU MUST re-pitch for the extra load. And im talking 3-5x Down to load the motor. Think about what your doing. You are adding 50hp NOW. So the prop needs to be pitched for an extra 50.

    Other thing to know is you need good fuel control .. yea a buzz pump add on NOS kit may work but it’s a gamble at best. You need a very accurate way of controlling fuel. Must guys 15 years ago went to mechanical pumps and EFI controller systems.

    I have a lot of success with nitrous oxide and all you need to remember is “keep the fuel right” 2.62 lbs of NOS to .5 lbs of gasoline and you will be OK

    And NOS motors LOVE load on them. Not RPM

    Maybe that helps. As I don’t know if you were asking me the qq

    Shawn

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    nitro

    I run a 34 nitro jet with a 16 fuel jet prop has been re pitched ski run good except hits rev limiter and drops to 8350 then goes back up to 8400 to 8450 I also tried down sizing nos jets no change this was installed by ppg just thought maybe someone else is having same problems thanks nitro

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    humm rough numbers..rule of thumb (for a wet system) meaning separate fuel pump...

    same jets ex 34 fuel 34 nox @ 8 psi gasoline....or 30 fuel 34 nox @ 6 psi of gasoline..

    reason is most aftermarket cheapo pumps put out 5.5-6 psi. so NOx is usually 4 sizes staggered NOx smaller.

    if you have a Dry system (no fuel adder but use the stock ECU) i would be scarred of that.. sounds like your're tapping into the stock fuel system.

    good luck

    PS , you do know bottle pressure should always be at 900 psi? right.

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    Re: nitro

    Quote Originally Posted by stickem
    except hits rev limiter and drops to 8350 then goes back up to 8400 to 8450
    Quote Originally Posted by NitroShark
    YOU MUST re-pitch for the extra load. And im talking 3-5x Down to load the motor.
    You do NOT have enough load on Juice, Repitch.

    Warning .. the Ski will be a DOG when your're off the spray...

  6. #6
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    I have the rotax racing ecu riva complete stage 2 tapped off of stock fuel
    pump The boat get tons of air I have 2 fans installed spark plugs look good fuel is good according to ppg thanks I know this will take time a few minor adjustments I will be good {I hope lol}

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    the dog part is what I'm tring to advoid theres a happy medium here some where my speeds are good on and off the spray I dont even know if i should worry about this

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    psi in bottle 950 85 degrees but thanks

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    prop re-picthed no juice rpms 7900 maybe needs more?

  10. #10
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    Quote Originally Posted by stickem
    prop re-picthed no juice rpms 7900 maybe needs more?
    ah YEA, a lot more. (i figure 7400 max off)


    when you hit the Juice. it should feel like "POW" its on.. if not its too rich with fuel.

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