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Thread: what is an ideal weight distribution ? 50/50 ? 40/60 ? 30/70 ?

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    Senior Member robburgoon's Avatar
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    Quote Originally Posted by ucfbrett View Post
    Nerfed?
    Nerfed. Weakend. It's a gaming nerd term. To nerf something is to make it less effective. To buff something is to make it more effective.

    I can see where it would be ambiguous with nerfing being a circle track term for "punt".

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    Faster than Oli jimt's Avatar
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    Could you please use nerf or buffed in a sentence?
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    Senior Member robburgoon's Avatar
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    Quote Originally Posted by jimt View Post
    Could you please use nerf or buffed in a sentence?
    You're probably full of it, but last year NASA wasn't happy that a 99 SM car without its restrictor was able to win PTE at the runoffs over PTE cars and they elected to nerf the 99 miatas by adding 50lbs to their minimum weight. Meanwhile, in SM for 2012 the 94-97 miatas received a buff of approximately 2 hp in the form of an adjustable fuel regulator.

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    Senior Member gkmccready's Avatar
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    Quote Originally Posted by bellwilliam View Post
    Miata, Corvette and BMW brag about their 50/50.
    *cough* RX7 *cough*

    Quote Originally Posted by redtopz View Post
    I have my ST2 vette to 50/50 not only front to back but also side to side. I bet more weight to the rear would be a benefit, however I agree that aero forces probably become a dominating factor at speed. Especially for F1 type race cars.
    You're lucky! Most C5/C6 cars get stuck at 52/48 from what I've heard. If you've got 50/50 without crazy rake I think you've hit the magic. Trans and diff coolers? And maybe your placement of the dry sump tank?

    Personally I think inside or over the axles and low is the most important. For RWD I'd take it to the back for traction under acceleration and better weight distribution under braking. Honestly I think it's as much driver pref as anything else... just like alignment or spring rates or sway bar or shock settings. If it makes you more comfortable you're going to be faster.

    As for 911s, I think they're fast in spite of having to be sprung so stiff as to make the mac-strut front suspension not a suspension rather than the rear engine issue...

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    The Real Captain Slow Red_5's Avatar
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    Quote Originally Posted by robburgoon View Post
    You're probably full of it, but last year NASA wasn't happy that a 99 SM car without its restrictor was able to win PTE at the runoffs over PTE cars and they elected to nerf the 99 miatas by adding 50lbs to their minimum weight.
    It was 101 pounds actually.
    Last edited by Red_5; 05-03-2012 at 06:29 AM.
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    Spec Backhoe Champion redtopz's Avatar
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    Quote Originally Posted by gkmccready View Post

    You're lucky! Most C5/C6 cars get stuck at 52/48 from what I've heard. If you've got 50/50 without crazy rake I think you've hit the magic. Trans and diff coolers? And maybe your placement of the dry sump tank?

    Personally I think inside or over the axles and low is the most important. For RWD I'd take it to the back for traction under acceleration and better weight distribution under braking. Honestly I think it's as much driver pref as anything else... just like alignment or spring rates or sway bar or shock settings. If it makes you more comfortable you're going to be faster.

    As for 911s, I think they're fast in spite of having to be sprung so stiff as to make the mac-strut front suspension not a suspension rather than the rear engine issue...
    No trans or diff coolers yet. Just some air ducting blowing down on the tranny. The dry sump tank and associated caging is probably most of it, plus I have a big battery relocated from the front to the passenger side rear.

    I don't know if I agree with driver preference in this case. Each car should have an ideal weight balance for optimal grip and I think everyone would find that preferable over less grip. I'm equally comfortable in my T1 car and ST2 car, but one of them simply has more cornering and braking grip.
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    Administrator ucfbrett's Avatar
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    OK, after some thought, wouldn't 50/50 be ideal because it's more stable and balanced during steering inputs, and because weight effectively transfers under braking and acceleration anyway?

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    Senior Member psychoazn's Avatar
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    Quote Originally Posted by robburgoon View Post
    You're probably full of it, but last year NASA wasn't happy that a 99 SM car without its restrictor was able to win PTE at the runoffs over PTE cars and they elected to nerf the 99 miatas by adding 50lbs to their minimum weight. Meanwhile, in SM for 2012 the 94-97 miatas received a buff of approximately 2 hp in the form of an adjustable fuel regulator.

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    Not Certified Slow SDSUsnowboards's Avatar
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    Quote Originally Posted by psychoazn View Post
    That's amazing. One thing is for certain: that gamer sure is eternally in blizzard's debt if he's been playing since beta. Lucky guy.
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    Senior Member bellwilliam's Avatar
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    Quote Originally Posted by ucfbrett View Post
    OK, after some thought, wouldn't 50/50 be ideal because it's more stable and balanced during steering inputs, and because weight effectively transfers under braking and acceleration anyway?
    I doubt 50/50 is ever ideal. only thing it is good for is skidpad. where you are on maintenance throttle.
    more rearward bias is needed for acceleration and braking.
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    Senior Member apk919's Avatar
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    Quote Originally Posted by J. Tyler View Post
    50/50 dynamic load distribution (whether it be front/rear, left/right, whatever) is ideal for a given acceleration amount & direction (assuming non-staggered tires and a perfect AWD system). The problem is that cars accelerate in an infinite number of directions....

    So the answer is, everything is a compromise and there is no such thing as perfect. But, for a RWD car, something like ~45/55-40/60 should be the best compromise. This results in ~50/50 under braking and more load on the rears when you're on throttle.

    And as Drew will remind us, you can't forget about aero....
    +1

    Just as a data point, most Type 111 chassis Lotus cars (Elise/Exige/2-Eleven) have around a 40/60 weight distribution.

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    Master of Disaster SteveLevin's Avatar
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    I believe F1 cars have actually oscillated in F/R distribution over time with changes in tyres and aero development. In the middle to late 90s cars had a huge rear bias, then it shifted way forward during the height of the Michelin/Bridgestone war, and now it's gone back again with the Pirelli tires (in fact, in 2010 they went with a narrower front tire because the cars were too pointy)... although I am sure the big aero improvements around the front of the car have contributed as well.

    Steve

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    Senior Member Todd R's Avatar
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    Everything is a compromise. Want grip on acceleration for a rear wheel drive car shift the weight back. Want better utilization of grip during braking shift the weight back. Want better cornering go with 50/50 weight distribution given equal tire contact patches front and rear. This is all ignoring aerodynamic forces of course. As I have said before the 911 chassis works well in racing because of regulations not because of inherent design superiority. Waiting for that Cayman with the GT3 motor (actually the new DFI motor seems pretty good).

  14. #34
    MJM
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    Roughly 40/60 for a RWD front wheel steering car. Then take the center of gravity and put all the mass as close as possible to it, and low for low polar moment of inertia.

  15. #35
    Senior Member WLopez34's Avatar
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    48/52, but that is in my go-kart

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