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Thread: ST185 Upgrades (turbo + suspension)

  1. #31
    Hopefully soon a 5S-GTE Chief Engine Builder MWP's Avatar
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    Default Re: ST185 Upgrades (turbo + suspension)

    Quote Originally Posted by jazz9 View Post
    Rear 235/50R17
    Front 215/55R17
    They are huge.
    I wouldnt go any larger in rolling diameter than 225/45/17's (what im running).
    I had to take a large hammer to my rear guards to stop them from scraping on medium sized bumps.

    235/40 should be ok, but you still might need to mod the rear guards.

  2. #32
    Junior Member Automotive Encyclopaedia Spectre's Avatar
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    Default Re: ST185 Upgrades (turbo + suspension)

    Quote Originally Posted by MWP View Post
    They are huge.
    I wouldnt go any larger in rolling diameter than 225/45/17's (what im running).
    I had to take a large hammer to my rear guards to stop them from scraping on medium sized bumps.

    235/40 should be ok, but you still might need to mod the rear guards.
    The tires are 235/40/17 all the way around. They aren't 50 profile. Rear guards need no modding, they didn't scrub or anything with the SSR's
    Quote Originally Posted by CLG
    It's a good system in theory, but it's fucked.

  3. #33
    Forum Member Grease Monkey
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    Default Re: ST185 Upgrades (turbo + suspension)

    I think Spectre is correct. 235/40/17 all round at the moment.

    I would like to go down to 215/45/17 at the front only to stop the fronts scrubing on bumps. Less then 1% difference in overall diameter.

    What does everyone reckon?

    Glen

  4. #34
    Hopefully soon a 5S-GTE Chief Engine Builder MWP's Avatar
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    Default Re: ST185 Upgrades (turbo + suspension)

    I wouldnt... but thats me.
    I would be fixing the guards so they didnt scrub.

  5. #35
    Forum Member Grease Monkey
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    Default Re: ST185 Upgrades (turbo + suspension)

    I'll take a few pictures this weekend, I don't think its possible without major panel work.

  6. #36
    Hopefully soon a 5S-GTE Chief Engine Builder MWP's Avatar
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    Default Re: ST185 Upgrades (turbo + suspension)

    Strange though, my 225/45/17 at +37 have plenty of room on the front.
    Its the 255/45/17 at +12 which is the problem on the rear.

  7. #37
    Forum Member Grease Monkey
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    Default Re: ST185 Upgrades (turbo + suspension)

    Hmm, mabe there isn't enough camber also its 8" wide rim



    Glen

  8. #38
    Junior Member Automotive Encyclopaedia Spectre's Avatar
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    Default Re: ST185 Upgrades (turbo + suspension)

    Offset is ~+35 on all the wheels too
    Quote Originally Posted by CLG
    It's a good system in theory, but it's fucked.

  9. #39
    Forum Member Grease Monkey
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    Default Re: ST185 Upgrades (turbo + suspension)

    What does everyone think of

    http://www.atsracing.net/Parts.mvc/Index/CT27

    ?

  10. #40
    Junior Member Automotive Encyclopaedia
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    Default Re: ST185 Upgrades (turbo + suspension)

    it'll be cheaper to get a ct20b, but if you do decide to get it, provided there's nothing wrong with the turbo you have now it'd be better to just sell it here than send it over for a price reduction/core exchange.

  11. #41
    Severely Underqualified Domestic Engineer Fodder's Avatar
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    Default Re: ST185 Upgrades (turbo + suspension)

    Yeah, I'd go a CT20b for the cheap option, or a GT28 if you can spend a bit more - wouldn't bother with anything in between, although since you say you want to keep as much of the piping original as you can it makes a bit of sense.

    On understeer - I've got the whiteline rear swaybar on mine with otherwise completely standard (original) suspension, and it's oversteer-ish under most conditions.

  12. #42
    Forum Member Grease Monkey
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    Default Re: ST185 Upgrades (turbo + suspension)

    Hmm, I would love oversteerish. The CT20b is proving hard to find.

    Glen

  13. #43
    Forum Member Grease Monkey
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    Default Re: ST185 Upgrades (turbo + suspension)

    Just a quick update. The understeer issues where fixed with a wheel alignment and reducing the fronts from 235/40/17 to 215s

  14. #44
    Hopefully soon a 5S-GTE Chief Engine Builder MWP's Avatar
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    Default Re: ST185 Upgrades (turbo + suspension)

    Reducing the fronts?
    So whats now on the rear?

    You are not meant to run different tyre sizes front to back due to the center diff (you'll cook it).
    To run different sizes, you have to pay very close attention to rolling diameters.

  15. #45
    RAAFENG Domestic Engineer punkture's Avatar
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    Default Re: ST185 Upgrades (turbo + suspension)

    I fixed my under steer with a nice sway bar and 2 degree camber at front

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