1996 bmw M3 evo, POWER RUN - Page 7

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    #61
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    At the moment i don't know anything more definite than mid-June
     
     

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    #62
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    Quote Originally Posted by markgixxer750 View Post
    At the moment i don't know anything more definite than mid-June
    Mid June is awesome for me

    That's plenty of time to get the coupe done
     
     

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    #63
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    That good then. Mid june it will be
     
     

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    #64
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    My M3 evo was on the rollers a couple of weeks ago, 264bhp at wheels 307bhp at flywheel. Your transmission losses seem high.
     
     

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    Ian S (12-04-2009)

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    #65
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    no two rolling roads will give the same figures either way
     
     

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    #66
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    true...and no two operaters
    what i've felt,what i've known
    never shined through in what i've shown.

    -------------------------------------------
    PLEASE READ THE POSTING RULES & HOW TO CORRECT THREAD TITLES & THE SELLING RULES
     
     

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    #67
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    Quote Originally Posted by mozzy View Post
    no two rolling roads will give the same figures either way
    Quote Originally Posted by 328mark View Post
    true...and no two operaters
    These points are very correct unfortunately

    What we'll have to do is be sure to arrange a couple of Power runs at different Rolling Road stations and compare the results from each place. Bet there's big differences too

    Bimmerforums watchdog
     
     

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    #68
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    Quote Originally Posted by A20 RYM View Post
    What we'll have to do is be sure to arrange a couple of Power runs at different Rolling Road stations and compare the results from each place. Bet there's big differences too
    I can suggest a place that's pretty accurate. He use dastek rollers, is 30 minutes outside Bristol (in the Oxford direction) and the guy's a BMW nut - he's got a E30 M3!

    It's who my brother and his mates use. For my brother he has overlaid standard car's graphs onto his print-out etc and has mapped my brother car a bit.

    He doesn't have a website but does frequent BMW forums. I found the link below to a report of a rolling road day there:

    http://www.bse-motorsport.com/bse_1st_dyno_day.html
     
     

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  12.  
    #69
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    If there is a RR day can I bring 2 cars? 1 BMW 1 Toyota. I would like to get it dyno tested again soon.

    Wheel figures are the only ones worth anything, flywheel guesses are just for pub talk. Only way to know FW BHP for sure is pop the engine out, strap it to an engine dyno and let it rip.

    Dyno pack are hub dynos and there is around 2% per driven wheel less losses on a 255 section tyre, so a BMW on a dyno pack would be circa 13% at the hubs, or 17% losses at the wheels. So trans losses are even more difficult to guess from 1 machine to the next. Run down measurements are not reliable. And as the power or the engine grows the losses do not grow in a liniar fassion, so at 200bhp you may loose 15%, but 400bhp only 12%, but 12% of a far bigger number to begin with.

    A dyno opperator knows you want 7565445.4bhp so can easily 'quote you happy' by altering numbers. Thats why I always quote wheel bhp for my cars. Shame the whole world cant do the same to level the plaing field. Big numbers impress the public when cars are on sale tho!
    Last edited by mrbarry; 13-04-2009 at 00:31. Reason: Missing letters due to keyboard battery being low.
     
     

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    #70
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    Quote Originally Posted by mrbarry View Post
    If there is a RR day can I bring 2 cars? 1 BMW 1 Toyota. I would like to get it dyno tested again soon.
    That would be cool
     
     

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