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Thread: Centre of Gravity Height

  1. #11
    SEC Member westonTB's Avatar
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    Re: Centre of Gravity Height

    Mine is standard Alfa 156 2.5, with a Willwood brake bias adjuster, wound all the way to the back & locked off for the IVA , braking is very good... even when I deliberately ask too much!
    Not too scary so far...

  2. #12
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    Re: Centre of Gravity Height

    Quote Originally Posted by westonTB View Post
    Mine is standard Alfa 156 2.5, with a Willwood brake bias adjuster, wound all the way to the back & locked off for the IVA , braking is very good... even when I deliberately ask too much!
    Not too scary so far...
    Thanks Tim,
    I think I'm probably going to start with the carry-over set-up and look at a rear brake upgrade post IVA. I think in that case a bias adjuster (to reduce pressure to the rear brakes) shouldn't be necessary. If you had yours adjusted for full rear pressure that makes sense.
    Cheers,
    Keith

  3. #13
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    Re: Centre of Gravity Height

    Quote Originally Posted by Iowstratos View Post
    Hi Keith
    I went for HiSpec 285 Billet 4 brakes with the standard Fiat 131 Hawk setup. The rear calliper has a built in handbrake.
    Ian
    Thank Ian, I'll have a look at HiSpec.
    Cheers, Keith

  4. #14
    SEC Member Iowstratos's Avatar
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    Re: Centre of Gravity Height

    Hi Keith
    HiSpec should still have all the information for the mounting and disc bells on file.
    Ian

  5. #15
    SEC Member Iowstratos's Avatar
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    Re: Centre of Gravity Height

    Some Pictures
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  6. #16
    SEC Member sean999r's Avatar
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    Re: Centre of Gravity Height

    John Cross Super Retro Rally X Stratos (Litton Corse I) uses same Wilwood forged Superlite 2 calipers and Disc O/D all around with 0.700" masters Ft / Rr,
    adjustment on balance bar, + quick adjust lever type bias on rear line.
    John states the Stratos type car with its weight distribution requires more rear brake bias, being raced on mix track surface conditions he would certainly know.
    This setup also simplifies spare parts with commonality.
    As previously mentioned it is probably very close to the 55/45 ratio split
    Last edited by sean999r; 22-12-2023 at 14:40.

  7. #17

    Re: Centre of Gravity Height

    From another source, Hawk estimated C of G 350mm...
    Last edited by StruanR; 23-12-2023 at 23:26.
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  8. #18
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    Re: Centre of Gravity Height

    Thanks for the information and advice. A 55/45 split looks like a reasonable target and achieving that with similar brake spec front and rear plus some form of adjustment (balance bar, valve) for fine tuning makes sense.
    Coming back to the original question about Centre of Gravity Height the calculations show that whilst it has an effect (the lower the CoG the less the weight transfer and the more rear brake bias required), its not as critical as i had thought it would be.
    The results show that the "Optimum" braking ratio changes from 52.8%/47.2% (Front/Rear) at 550mm to 48.2%/51.8% at 350mm. The "Optimum" allows no tolerance for brake performance variation so adding in some margin for that, 55%/45% seems sensible.
    But, I shall build my car with the brakes I have and look at an upgrade for the rears later, after I've had a chance to drive it.

    Happy Christmas,
    Keith

  9. #19
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    Re: Centre of Gravity Height

    I read the theory and books some time ago, and as far as my understanding goes, I thought that the potential for manipulating the centre of gravity height in the restricted envelope of the Stratos chassis and body that most of us have to work with has got to be pretty limited.
    Sean probably has the most potential with his one off chassis.
    What would you actually have to shift around in the chassis to achieve a 200mm difference in c.o.g height?

  10. #20
    SEC Member Iowstratos's Avatar
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    Re: Centre of Gravity Height

    Hi John
    I think to get C.O.G. Of 200mm i think you need to have very heavy balls as that will be the lowest part of the car!
    Happy Christmas and good driving in the new year.
    Ian

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