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Thread: New tryres - Poor handling

  1. #1
    Regular Member jamesr's Avatar
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    Default New tryres - Poor handling

    I have just changed my rear tyres for Falken 225 45 17 tyres, I changed to the different profile to make them a little less expensive.

    The front two tyres are still the Goodyear NCT5 with approx 3mm of tread left, on the original profile of 215 50 17

    Since swapping over the handling of the car has been awful

    The car seems to track all over the road, hitting a corner at more than 50 and the car is like its on castors, the rear end feels like it will step out at any time even at that low seed.

    At higher speeds the steering becomes very twitchy, almost feels like any small movement on the wheel could send you in a spin

    Is the problem the two differing profiles or tread patterns(I know BMW fit wider wheels at the back) so can't see why


    HELP!!!

  2. #2
    Full Member Big Sig's Avatar
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    Maybe try swapping back to front to see what happens? Also check the pressures in the new tyres.
    Now I need a turbo to keep up!

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    Regular Member m8internet's Avatar
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    Falken 225/45 R17
    What is the treadwear / traction / temperature rating of those?
    What is the load and speed rating?
    What is the tyre pressure you are using?
    Have you adjusted the Good Year NCT5 on 215/50 R17 tyre pressures, presuming you swapped them from rear to front? Also, what load and speed rating at they?

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    Regular Member Craig1985's Avatar
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    i brought kuhmo tyres and they were damagerous!!!! only had them on for couple weeks. now back to michelins. if profile wouldnt make a difference, if anything itll make it handle better imo?

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    Regular Member jamesr's Avatar
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    Quote Originally Posted by m8internet View Post
    Falken 225/45 R17
    What is the treadwear / traction / temperature rating of those?
    What is the load and speed rating?
    What is the tyre pressure you are using?
    Have you adjusted the Good Year NCT5 on 215/50 R17 tyre pressures, presuming you swapped them from rear to front? Also, what load and speed rating at they?
    I haven't checked the pressure.

    Product Description
    225/45R17 94W XLTL FALKEN ZE912
    Width
    225
    Aspect Ratio/Profile
    45
    Construction
    R
    Rim Diameter
    17
    Load Index
    94
    Speed
    W
    Ply
    XL
    Tubeless/Tube Type
    TL
    Make/Brand
    FALKEN
    Model
    ZE912


    Fronts are 91 W not XL's

  6. #6
    Regular Member m8internet's Avatar
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    I did a test of Kumho Ecsta tyres a few months ago on Honda Accord
    They were great in the dry test, but in the wet test they were awful with aquaplaning in just 4mm of water
    Compare that with Michelin Primacy and Good Year NCT5 which both aquaplaned at 6mm of water
    Best, and only, performer in the wet was Vrederstein at 7mm of water, their latest has a most unsual tread pattern which may be the reason

  7. #7
    Regular Member m8internet's Avatar
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    Try this, with the tyres completely cold :
    Inflate the front tyres to 39 PSI (manual states 38 PSI)
    Inflate the rear tyres to 35 PSI

    Given your car is a 3.2 V6 GSI it really should have XL tyres on the front
    You really want to use up those NCT5 tyres as quick as possible, or replace them and offer them as part-used

    Also, I note that your car has a LPG conversion, what is the additional weight?
    Last edited by m8internet; 30th August 2008 at 14:49.

  8. #8
    Regular Member jamesr's Avatar
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    So what pressures should I be running then?

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    Regular Member jamesr's Avatar
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    Quote Originally Posted by m8internet View Post
    Try this, with the tyres completely cold :
    Inflate the front tyres to 39 PSI
    Inflate the rear tyres to 38 PSI

    That seems high?

  10. #10
    Regular Member m8internet's Avatar
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    ** The rear tyres should be 35 PSI hence the discrepancy in the quote, edited my original post while you were replying!
    **

    The front tyres should be 38 PSI for the 3.2 V6 GSI
    I have adjusted this up by 1 PSI as your car is probably slightly heavier having a LPG conversion
    I would also suggest increasing the rear tyre pressures from 35 to 38 PSI

    Every time my car goes in to VX dealership for servicing it always comes back with tyres at between 30 and 32 PSI, which is way too low
    As a result I had to query it, then they showed me the chart they use, and it has the same tyre pressure for all models!
    On my last visit I gave them specific instructions not to change the tyre pressures
    Even my local garage has the same chart!

    I myself now drive with tyre pressures of 39/38 and the handling is vastly better
    Even when the tyres get down to 2mm they are nice and evenly worn across the central three quarters of the tread surface
    Last edited by m8internet; 30th August 2008 at 14:55.

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