Midland/ Pedders Sprint Series Round 4
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  1. #1
    Fellow Frogger! bingham driver's Avatar
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    Default Midland/ Pedders Sprint Series Round 4

    Off to Winton again this Saturday to turn a wheel in anger once more.
    After some minor suspension tweaks & tuning adjustments if I can repeat
    the last round effort I'll be 'most pleased'.

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  2. #2
    Fellow Frogger! bingham driver's Avatar
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    Ok, so the suspension tweaks didn't amount to anything positive, in fact handling was not as good as last time. The only major change was rear tyre rotation direction & I couldn't better my best time (1:45:06) from last year. Oh well, better luck in November.
    Once I thought I was wrong but, I was mistaken

  3. #3
    COL
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    Hi Bingham driver

    Why the rear tyre rotation direction?
    Regards Col

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  4. #4
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    Had the tyres worn in to suit the geometry/wear of their original sides?
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  5. #5
    Fellow Frogger! bingham driver's Avatar
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    Hi Col & Simon, The rear tyres (325/60 15) were wearing a bit uneven so even though they're directional semi-slicks I ran on the 'good' day with the wheels swapped side to side. Then for last Saturdays event I had the tyres turned around on the rims. I think next time I might run them against 'direction' again & do nothing else & see what happens.
    The suspension tweak was simply a slight ride height change (10mm lower) with the resultant camber change, not critical enough to cause THAT much difference in handling methinks.
    Once I thought I was wrong but, I was mistaken

  6. #6
    COL
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    Quote Originally Posted by bingham driver View Post
    Hi Col & Simon, The rear tyres (325/60 15) were wearing a bit uneven so even though they're directional semi-slicks I ran on the 'good' day with the wheels swapped side to side. Then for last Saturdays event I had the tyres turned around on the rims. I think next time I might run them against 'direction' again & do nothing else & see what happens.
    The suspension tweak was simply a slight ride height change (10mm lower) with the resultant camber change, not critical enough to cause THAT much difference in handling methinks.
    Sounds like not enough rubber in contact with the road.

    10mm in ride height does make a bit of difference to rear camber (assuming you are using a swing axle rear). And as they say the stop watch does not lie.

    The trouble is with any changes you make to the suspension need to be compared on the day as track and weather conditions can make a difference to lap times.
    Regards Col

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  7. #7
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    Quote Originally Posted by bingham driver View Post
    The rear tyres (325/60 15) were wearing a bit uneven so even though they're directional semi-slicks I ran on the 'good' day with the wheels swapped side to side.
    Racing tyres can wear a bit funny, almost as if the compound develops a set, so when they are run in the opposite direction they start to be a bit squirrelly. Or the tyres develop a heel and toe based on the various suspension settings, then when reversed, the tread again has developed a set that doesn't aid good handling. As Col mentions, the difference in ride height will change characteristics, and in the overall scheme of a racing car, a 10mm change in ride height is quite significant when it comes to changes in the suspension geometry.
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