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Thread: Heat Soak

  1. #1
    Chrisrokc's Avatar
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    Heat Soak

    I own a GPR, but love the new Ultra 250. I was thinking about the blower setup on it today and thought to my self, wouldn't the roots/twinscrew setup be much more prone to heat soak when compared to the RXP? What is the take on this with you guys? I know people are running in 70 degree ish temps right now, but we all know there is a difference between a ski in 70 degree weather and 90-100 degree. How big will the difference be on the Ultra 250?


  2. #2
    Heat will be a factor, but have you seen the size of the intercooler?

  3. #3
    Hydrotoys's Avatar
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    This will be more noticeable on the 250 vs the other power adders, from what I've been told.

  4. #4
    snapper455
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    There will be almost no diff noticed on the 250 from 40 degree tp 90 degree water. The ecu compisates for it on this motor

  5. #5
    Chrisrokc's Avatar
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    Quote Originally Posted by snapper455 View Post
    There will be almost no diff noticed on the 250 from 40 degree tp 90 degree water. The ecu compisates for it on this motor
    So you are telling me the ecu could be modded for MAJOR gains in the cold?

    If I am correct it will work just like a car with a MAF system. The tune changes with the temp and and volume of air, but power is still lost from hot to cold.

  6. #6
    Chrisrokc's Avatar
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    Quote Originally Posted by hydrotoys View Post
    This will be more noticeable on the 250 vs the other power adders, from what I've been told.
    If that ends up being the case, get out your ice bags when it comes to drag racing! Or it would be cool to have a nitrous ic sprayer.


  7. #7
    Quote Originally Posted by Chrisrokc View Post
    If that ends up being the case, get out your ice bags when it comes to drag racing! Or it would be cool to have a nitrous ic sprayer.

    Looking at your signiture, I think you know about this for some reason

  8. #8
    Chrisrokc's Avatar
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    Quote Originally Posted by tbyrne View Post
    Looking at your signiture, I think you know about this for some reason

  9. #9
    Here is the math if I have done it correctly, at 50 deg. F the density of air at 1 atmosphere is 1.247 kg/m^3 while at 86 deg. F the density of air is 1.164. That equates to 7.1% more air density at 50 deg. compare with to 86 deg assuming the intake air temperature after the intercooler is 50 and 86.


    If your ski can produce 250 hp at 86 deg, at 50 deg, it could produce 267 hp.

  10. #10
    Connecticut CrazyA's Avatar
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