Quick 1/4 Clio 172
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  1. #1
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    Default Quick 1/4 Clio 172

    A fellow I know who has done a lot of open wheeler racing recently purchased a 172. He decided to do a 1/4 mile sprint, and after much experimentation finished with a time of 14.68 - stock car remember.
    The 'secret' ? 13psi front 40psi back!

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    Quote Originally Posted by 911s
    A fellow I know who has done a lot of open wheeler racing recently purchased a 172. He decided to do a 1/4 mile sprint, and after much experimentation finished with a time of 14.68 - stock car remember.
    The 'secret' ? 13psi front 40psi back!
    R u sure that was it mate???? That is a very quick time for a car that does 15.5's....

    I believe it when i see the time slip!!!!
    Jaime....

    "Honda makes power for the hell of it, Renault makes power you can use".

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    Quote Originally Posted by RCS 20L
    R u sure that was it mate???? That is a very quick time for a car that does 15.5's....

    I believe it when i see the time slip!!!!
    hmmm i thought it was 15.3 172 & 15.1 182?

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    Well, in motorsport, this guy is definitely a 'Top Gun'. He has an unusual feel for cars. Only he would have thought to adjust tyre pressure to that extent.

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    Fellow Frogger! WRCPUG's Avatar
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    Crazy stuff
    What was his 60 foot time and MPH?
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    1000+ Posts HONG KONG PUGGY's Avatar
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    You'd have to believe in he science of what he did.

    High pressure in rear tyres, would stop the car lifting the nose as much when power is applied. I wonder if the fronts would ride up like the rear tyres on Drag cars do, when they spin faster they get taller. Could have been how he reduced his time by drive wheels becoming larger in diameter towards the end of the 1/4???
    I really have anything is possible.
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    Quote Originally Posted by nate
    hmmm i thought it was 15.3 172 & 15.1 182?
    Sorry Nate.... Was just rounding in 5's, and ur right a 172 does do 15.3...

    But wiping off nearly a whole sec... damn thats quick... At those speeds he will beat me by 10 car lenghts.... What the
    Jaime....

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    Fellow Frogger! biologist's Avatar
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    Stopping that weight shift to the rear wheels would certainly prevent a lot
    of wheel spin and could be where all the time savings are made...

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    A softer tyre gives more straight line traction, that's all.


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    Fellow Frogger! ClioF1's Avatar
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    40 Psi isn't that extreme, I run 39 in the front all the time. There is no way that stopped the rear compressing under take off. The only way to stop that is suspension - an old trick is to put chocks in the rear springs.

    13 Psi is very low though, maybe I will have to give it a go if I get my car to WSID one day.
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    Fellow Frogger! biologist's Avatar
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    Quote Originally Posted by Stuey
    A softer tyre gives more straight line traction, that's all.
    Quote Originally Posted by ClioF1
    40 Psi isn't that extreme, I run 39 in the front all the time...
    ..13 Psi is very low though, maybe I will have to give it a go if I get my car
    to WSID one day.
    Agree and Agree, years ago when in a pit crew running a street car at
    Waneroo we used to keep the race tyres at 38-40 psi.
    (These were very expensive buffed road tyres not race slicks)
    But there is no way I'd want to corner hard in a Clio, or anything
    for that matter, with only 13 psi in the tyres..

    I'd be real interested to see how much weight shift there is with
    such low fronts as the squigy tyres would grip harder rather than
    spin madly? and I doubt there would be as much weight transfer
    but I'd love to see it.

    cheers,
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    Quote Originally Posted by biologist
    I'd be real interested to see how much weight shift there is with
    such low fronts as the squigy tyres would grip harder rather than
    spin madly? and I doubt there would be as much weight transfer
    but I'd love to see it.

    cheers,
    There would be no change in weight transfer just with the altered tyre pressures. What would be happening is that the soft front tyre would be altering from say a W shaped underinflated form to a U shaped form as the weight comes off the front end through acceleration and the weight transfers. That way the tyre would constantly grip the track rather than spin as more of the tyre tread comes into contact with the track. The high rear inflation would just reduce the overall drag of the car on the ground as it would be virtually tippytoeing on the centre of the tyre.

    Also it would have an awful lot to do with the technique too, too much gas and you could probably start smoking the underinflated bags quite nicely off the line!

  13. #13
    Fellow Frogger! biologist's Avatar
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    Quote Originally Posted by Simon
    There would be no change in weight transfer just with the altered tyre pressures. What would be happening is that the soft front tyre would be altering from say a W shaped underinflated form to a U shaped form as the weight comes off the front end through acceleration and the weight transfers. That way the tyre would constantly grip the track rather than spin as more of the tyre tread comes into contact with the track. The high rear inflation would just reduce the overall drag of the car on the ground as it would be virtually tippytoeing on the centre of the tyre.

    Also it would have an awful lot to do with the technique too, too much gas and you could probably start smoking the underinflated bags quite nicely off the line!
    OK I see what your saying, it would certainly take a bit of practise to
    achieve a good launch but obviously if the report is true can be quite
    effective, in a straight line.
    In the end though wouldn't it just be easier to get some real slicks and
    see what happens??

    cheers,
    Biologist
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