ET difference at altitude vs sealevel
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ET difference at altitude vs sealevel

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    Senior Member speedealer's Avatar
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    Default ET difference at altitude vs sealevel

    trying to get an idea of et gains at sealevel, i know there is a 8 to 10mph gain from N.M. to AZ. but never had clocks to see ET difference. I know there are alot of variables, just looking for an average. My boats runs 7 teens in a 1000ft at 5000ft 100* day. Hoping it will run TE #s
    Last edited by speedealer; 07-27-2011 at 09:55 PM.

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by speedealer View Post
    trying to get an idea of et gains at sealevel, i know there is a 8 to 10mph gain from N.M. to AZ. but never had clocks to see ET difference. I know there are alot of variables, just looking for an average. My boats runs 7 teens in a 1000ft at 5000ft 100* day. Hoping it will run TE #s
    Heres an interesting formula I just found to apply and ponder ....hp loss = elevation x 0.03 x hp @ sea level
    1000
    now wheres a calculator ?

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    just a ski boat with bark Carnivalride's Avatar
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    Quote Originally Posted by speedealer View Post
    trying to get an idea of et gains at sealevel, i know there is a 8 to 10mph gain from N.M. to AZ. but never had clocks to see ET difference. I know there are alot of variables, just looking for an average. My boats runs 7 teens in a 1000ft at 5000ft 100* day. Hoping it will run TE #s
    FWIW based on calculations off my flat 7 teens on a 1000' course should be around 9.04-9.11 in a 1/4 mile so it looks like you should be right there especially if you can get some better air.
    Quote Originally Posted by gn7 View Post
    Carnivalride, you really need to find some other hobby. You have no talent for this boat thing

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    B1 Racing cs19's Avatar
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    Quote Originally Posted by speedealer View Post
    trying to get an idea of et gains at sealevel, i know there is a 8 to 10mph gain from N.M. to AZ. but never had clocks to see ET difference. I know there are alot of variables, just looking for an average. My boats runs 7 teens in a 1000ft at 5000ft 100* day. Hoping it will run TE #s

    You will have no problems running the number, put some thought into how you can slow the thing down. What was the DA when you ran that and where and when is your next race? The DA is the thing to pay attention to

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    Senior Member cyclone's Avatar
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    I find that for ever 500-feet the density altitude increases on my weatherstation, my boat slows down about .025 second.

    Then again, that figure goes right out the window if the driver is a tard, the hardware is wrong, or the compressed gas attendant spikes the bottle pressure before I make a pass.

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    Senior Member speedealer's Avatar
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    Thanks guys, have'nt really payed attention to anything yet, still trying to get use to the boat again, have'nt driven since 06. only have a dozen passes since it got back on the water. I'm in the process of getting the data system going. I'll pay attention to things at the next race in a couple weeks. thanks again for the input.

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