Base points of Z4 M coupé vs roadster

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  • #2113
    ricardo jamin
    Participant

    I’m curious about the base point for z4 m roadster vs coupé
    The roadster is actually four points higher than the coupé.
    Which is the reverse of the usual thinking of open top car sacrifices some performance for the missing roof structure. I do notice BMW tech spec said M coupé is lighter than the roaster by 27 lb.
    Are there any other factor that give the roadster advantage over the coupé for autocross?

    –ricardo

    #2114
    Dave Dunwoodie
    Participant

    Fun factor. 😛

    #2115
    Cliff Oates
    Participant

    [quote=”car313″ post=1785]II do notice BMW tech spec said M coupé is lighter than the roaster by 27 lb.
    [/quote]

    The coupe is actually 33 pounds heavier according to my M Roadster/Coupe sales brochure (3230 vs 3197). BMW started with the roadster and added a roof, and not the other way around. I think the coupe has the advantage when it comes to torsional rigidity.

    I am curious about the 4 point difference too – the cars are nearly identical.

    #2119
    Jeff Roberts
    Keymaster

    Looking at the base points data I have, there is only 1 point difference between M coupé and M roadster

    [table]
    [tr]
    [td]Chassis[/td]
    [td]Car[/td]
    [td]Year From[/td]
    [td]Year To[/td]
    [td]Points[/td]
    [td]Engine Level[/td]
    [td]LSD Points[/td]
    [td]Front Wheel Width[/td]
    [td]Rear Wheel Width[/td]
    [td]Suspension Code[/td]
    [/tr]
    [tr]
    [td]E36/7S[/td]
    [td]M Roadster[/td]
    [td]1998[/td]
    [td]2000[/td]
    [td]53[/td]
    [td]8[/td]
    [td]N/A[/td]
    [td]7.5[/td]
    [td]9[/td]
    [td]M[/td]
    [/tr]
    [tr]
    [td]E36/7S[/td]
    [td]M Coupe[/td]
    [td]1998[/td]
    [td]2000[/td]
    [td]52[/td]
    [td]8[/td]
    [td]N/A[/td]
    [td]7.5[/td]
    [td]9[/td]
    [td]M[/td]
    [/tr]
    [tr]
    [td]E36/7S[/td]
    [td]M Roadster[/td]
    [td]2001[/td]
    [td]2002[/td]
    [td]55[/td]
    [td]9[/td]
    [td]N/A[/td]
    [td]7.5[/td]
    [td]9[/td]
    [td]M[/td]
    [/tr]
    [tr]
    [td]E36/7S[/td]
    [td]M Coupe[/td]
    [td]2001[/td]
    [td]2002[/td]
    [td]54[/td]
    [td]9[/td]
    [td]N/A[/td]
    [td]7.5[/td]
    [td]9[/td]
    [td]M[/td]
    [/tr]
    [/table]

    When the 2001 models are classed with no mods, they are still just one point apart: Coupé is 59, Roadster is 58. Is this what you’re seeing?

    #2120
    ricardo jamin
    Participant

    I was referring to the 06-08 model, e85/6

    –ricardo

    #2121
    Jeff Roberts
    Keymaster

    Reading comprehension fail on my part. I’m seeking guidance from the classification system team on this one as it’s not obvious to me form the data I have access to.

    #2126
    Dave Sparks
    Participant

    4 points does seem way off. On paper, they should run pretty similar times in stock configuration.

    #2136

    Another Z4 curiosity, albeit affecting the new e89 platform.
    The 2010 Z4 35i with sport suspension has 48 base points, yet the exact same model in 2011 and 2012 only has 47. According to BMW, the model hasn’t changed over these years.

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