motorsport tyres?
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  1. #1
    Fellow Frogger!
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    Default motorsport tyres?

    i have been looking around for a set of road legal motorsport tyres for my 405. i have a set of 15" rims for road use, but i want a lower tyre than the current 195/65-14 to give me some better get up.

    i know there alot of competitors on here and was wondering what are the most popular tyres. i was looking at doing some circuit days with them, but mainly motorkhana and hill climb.

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    thanks

  2. #2
    Fellow Frogger!
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    sorry, i forgot one last question.

    i don't suppose anyone out there knows the formula for working out the rolling diameter of a tyre from the widht and aspect?

    also, what pressures do you run your tyres at for these events?

  3. #3
    1000+ Posts CHRI'S16's Avatar
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    3 basic candidates are
    A) Dunlop DJO1 semi-slick more lean to track than road, pricy but quality.
    B) Bridgestone RE's again more track than road, very good all round priceVgo.
    C) Falken AZENIS, more road than track, but cheaper and not a full semi-slick.
    Ring Gordon Leven Tyre's for prices.
    ... ptui!

  4. #4
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    Try this link for sizing... http://www.miata.net/garage/tirecalc.html

  5. #5
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    thanks guys,
    the tyres i am after are not for road use at all, as i said only the odd track day and mainly motorkhana and hillclimb. i was only after road legal tyres as under the cams regulations semi-slicks and tyres marked "not for road use" places me in category F (i think), and as nice as my 405 is it and me ain't going to beat Wayne Griffiths in his special.

    any suggestions for pressures?

  6. #6
    1000+ Posts PeterT's Avatar
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    What about Yoko A032's? They're the best in terms of heat cycles. ie you want to use them for a few laps at a time, but over a long period of time (1-2 yrs). Dunlops are better initially, but go off quickly. Tyre pressure depends on the event, day, etc. Start at 28psi cold, with a maximum hot of 34, all round. Your cold pressures will vary front to back, and side to side, depending on the track.

    Try this site for rolling diameters:
    http://www.smokemup.com/auto_math/index.php

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  7. #7
    1000+ Posts tekkie's Avatar
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    with regards to tyre size unless you are hell bent on keeping the speedo accurate it doesnt mean all that much. Generally your gearing should be such as to provide maximum acceleration. That usually equates to the smallest wheel diameter that will fit over your existing brakes. Likewise smaller sidewall will reduce the rolling diameter.

    I found Toyos RA1 to be brilliant but they wear a lot quicker than the yokies Ao32R did.
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  8. #8
    Fellow Frogger!
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    PeterT, whats the heat cycle and life expectancy of AvonACB10 compared to the Yoko032R ?

    I respect your knowledge of race setup - so it comes as a surprise that the tyre pressures are so low. *I* thought you had to run 'em at like 34min aiming for 40 at each corner. I guess i was wrong.

  9. #9
    Cal
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    Slicks and semi slicks are run at much lower pressures that traditional road tyres.

    Cal.
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  10. #10
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    i was aiming for a lower rolling diameter for quicker acceleration, as the pug is geared really high, escecially for the work i want to do.

    peter, i was also under the impression that you needed higher pressures, but is this because the competition tyres have much stiffer sidewalls and don't roll as much? obviously the pressure will increase as the tyre gets hotter, i realise.

    has anyone tried the kumho tyres? i'd like the avons but they don't come in 14", so it's looking like toyo kumho or perhaps yoko.

  11. #11
    1000+ Posts tekkie's Avatar
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    each brand has specific pressures they are most happy with. Yokies like to run at lower pressures, where as the same size Toyo runs about 6~8 psi harder !

    Kumho is actually a really nice soft thread. (the treadwear rating is your hint there). Toyo has a rating of 40, kumho 50, yokies 60, dunlop 80

    Avons ACB10's do come in 13's and 15's and are the softest thread pattern available (hence their use in Forumla Fords) but at about twice the cost of Toyo's and Yokies. Talk to Gordon Leven tyres about Yokies and Avons.
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  12. #12
    1000+ Posts alan moore's Avatar
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    Back when I was motorkhanaing my 405, I used Yoko A032R tyres with 38F and 34R cold. The 405 is very heavy in the front and needs the high pressures to hold them up. I used 195/60/14 tyres (used) from owners of Improved Production cars with maybe a 1/3 tread for $20-$40 each. They simply had done the max no of cycles for top performance, meaning they had lost .5-.7 of a sec per lap, but fine for me. I used them down to the canvas.
    Motorkhana is more about talent than tyres.
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  13. #13
    1000+ Posts PeterT's Avatar
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    According to Levins, the A032's go off at 35psi.

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  14. #14
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    how did you get onto the used yokos?

    are they stil available?

    for $40 a pop they seem reasonable value

  15. #15
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    hey wow,

    that post sent me into fellow frogger from member!

  16. #16
    1000+ Posts PeterT's Avatar
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    How many do you want? Just hang around the supersprints. I've got a few that I'd gladly sell for $40 each.

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  17. #17
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    i was only after two at the moment as i don't have tyres on the 15" rims and i would have to run them on the road for about a week until i do.

    i may just have to get new ones. a 2 to 3 hour drive is a bit much just to hang around the super sprints.

    ps. when are the next track days on oran park or eastern creek? i'd like to give it a go.

  18. #18
    1000+ Posts PeterT's Avatar
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    Quote Originally Posted by 3006882
    i was only after two at the moment as i don't have tyres on the 15" rims and i would have to run them on the road for about a week until i do.

    i may just have to get new ones. a 2 to 3 hour drive is a bit much just to hang around the super sprints.

    ps. when are the next track days on oran park or eastern creek? i'd like to give it a go.
    I've got two 185/60/14 Dunlops if that helps. Next Supersprint is 31 Oct. , Oran Park.

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  19. #19
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    is that two dunlop 185/60-14's for sale, or is it just a "nah nah look what i've got and you don't"?

    pitty i didn't read this thread again earlier. i was at ansell park yesterday, and i don't really come to sydney all that often (read: i hate the freeway with a passion... i have daggers for the freeway! ).

  20. #20
    1000+ Posts PeterT's Avatar
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    Quote Originally Posted by 3006882
    is that two dunlop 185/60-14's for sale, or is it just a "nah nah look what i've got and you don't"?

    pitty i didn't read this thread again earlier. i was at ansell park yesterday, and i don't really come to sydney all that often (read: i hate the freeway with a passion... i have daggers for the freeway! ).
    Yep, two 185/60/14 D98J Dunlops, 15-20% thread, $40 each.

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  21. #21
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    cool, i'll pm you later and we'll arrange pick up.

  22. #22
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    ordered some A032R's. Is $300 a corner a rip off (remember i am in SA)

    i suppose i had better mention that they're 195/55/15

  23. #23
    1000+ Posts alan moore's Avatar
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    Don't know about that size, but 195/60/14 A032Rs are around $200 ea.
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    After several years now of historic racing/hillclimbing & tarmac rallying I would say that the Yokohama A032 is the tyre to use. They tend to communicate better than any other that I have tried. As to how long they last is entirely controlled by your driving ability. I have seen guys at the track with brand new A032s and by the end of the day 1 or 2 of the tyres have to be thrown away as they have been 'flatspotted' due to brake lockups.

  25. #25
    1000+ Posts David Shearer's Avatar
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    Quote Originally Posted by XsaraVTS
    ordered some A032R's. Is $300 a corner a rip off (remember i am in SA)

    i suppose i had better mention that they're 195/55/15
    Nah Its an expensive size. I got prices myself the other day. P6000 215/15 were around $190, and 195/55/15 were over $270. I wouldn't pay $300 but it would depend onwhat you're after

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