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Thread: getting grip with your rear suspension

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    Senior Member s14seriesII's Avatar
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    Default getting grip with your rear suspension

    ok so my car is lacking rear end grip

    both coasting around a corner and under power it just slides, even in 4th gear it will roast the tyres

    i had quite old semi slicks on the rear so this may be part of the issue but i still need a lot more grip

    so who has done what ? roll centers, watts links, trailing arm lengths, positions and angles
    Last edited by s14seriesII; 31st May 2009 at 08:41 PM.
    Owner built and tuned 9000rpm 402kw atw 3sGTE - AE86

    Quote Originally Posted by Beau View Post
    4ages are for the scared

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    Senior Member charged's Avatar
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    what springs are you running, do you run a panard now, how big a sway bar ? how fucked are the semis if they have gone through to many heat cycles and are hard they are next to useless

    Go softer springs to start with, does it power down or is it turn in oversteer, roll oversteer?
    John
    IPRA KE25 Corolla S.A #25
    www.sharperto.com.au

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    have a chat with josh young - he allways claimed his red toy was remarkedly grippy, but for the life of me i cant remember what he put it down to.

    i know half the story was a dodgy pressure guage... reading 36 psi when it had like 28 psi or something. Mostly i think his came from pinion angle?
    RIP Carly - a smile to light the world.
    06/07/2011

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    Equal length 4 links with traction brackets would be a good start

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    Senior Member s14seriesII's Avatar
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    i have reasonably stiff springs suited to circuit use the tyres had been very well over heated previously
    i am running 18mm rear sway bar maybe adjusted too stiff
    running nagisa auto traction brackets on the most agressive setting with cusco trailing arms ( they are damn near the ground lol)

    it has turn in oversteer, roll oversteer, and light throttle oversteer, and just wheel spin all the way through 3rd and is quite loose in 4th with 3.9 diff ratio

    and still running stock panard rod in stock height location
    Owner built and tuned 9000rpm 402kw atw 3sGTE - AE86

    Quote Originally Posted by Beau View Post
    4ages are for the scared

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    How much power do you have?

    What width tyres are you running?

    What spring rate are your springs?
    RT142 Estate.

    AJPS.

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    Senior Member s14seriesII's Avatar
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    somewhere between 250 and 300rwkw.. havent been back on a dyno since the first tune at 18psi it made 205

    225/50/15

    about a 9.5kg with bilstein shocks
    Owner built and tuned 9000rpm 402kw atw 3sGTE - AE86

    Quote Originally Posted by Beau View Post
    4ages are for the scared

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    wow!

    you need 6 kg rear springs the difference will be huge.

    obviously you realise that with that much power with live axle and 900kg's its always going to feel pretty slippery....
    RT142 Estate.

    AJPS.

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    in the words of adam savage,

    well theres ya problem!

    soften it up a bit!

    if your shocks are adjustable, you can try softening them up, but failing that...new springs!

    btw are you talking about an ae86 or an s14?

    appears your talking about an ae86. so yer 9.5 is way over kill for anything. i have 6kg and i reckon its not grippy enough, get some standards and cut them, and see what you think. ask "ruiki" off here, he was getting amazing grip with 6kg front and just stocko rear. even had no sway bar at one stage.

    also you mention you have a upgraded sway bar, stiffening up your swaybar will tend to decrease rear end roll, and thus "grip".
    Last edited by ke70dave; 31st May 2009 at 10:46 PM.

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    Senior Member s14seriesII's Avatar
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    ae86.. my s14 has shitloads of grip

    hmm have tryed 5.5 in my road car and it still has no grip will try them in this when i get some new tyres as they delamed on the last lap..

    problem is its about 3 seconds slower than the lead ip car down here and im not running the intake restrictor, new tyres will help a lot but not that much
    Owner built and tuned 9000rpm 402kw atw 3sGTE - AE86

    Quote Originally Posted by Beau View Post
    4ages are for the scared

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