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Thread: More speed

  1. #1
    HighPSI's Avatar
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    More speed

    I have a 05 Honda r-12xturbo with the Macboost Stage2 kit. I am currently running a Island Racing pitched 17.5/29 prop at 17psi of boost with a manual boost controller. The ski accelerates very well and has only hit 66mph top speed. Occasionally, it will set a code if I run it at high boost for an extended period of time.
    How fast can I go if I mix in some race gas and turn up the boost? How high can I run the boost if the octane is ok? I have another prop that is a 17/31 if the rpm's get too high. Are there any other mods I should do first?


  2. #2
    supermac's Avatar
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    19-19.5 is a safe limit.

  3. #3
    HighPSI's Avatar
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    Thank You!! I'll throw in a few gallons of 110, turn up the boost and watch the rpm's. If they get too high, I'll reprop. I appreciate all you have done for these ski's

  4. #4
    HighPSI's Avatar
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    I ran the ski yesterday at the same boost level (17psi) It went 66.8mph with nearly a full tank of fuel. This was at 6460 rpms. The problem I am having is if I run it hard for too long it beeps and goes into limp mode. I forgot to look for a "code". Any ideas? What rpm should I run the ski at? I am wondering if I am tickling the rev limiter.

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