Massive clunking/bumping noise when I....
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This is a discussion on Massive clunking/bumping noise when I.... within the Everyday Impreza Talk forums, part of the Community - Meet other Enthusiasts category; Ok so, when I try to launch with traction control off, I usually rev up to 4000-5000 rpm and dump ...

  1. #1
    Registered User LENSPEC's Avatar
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    Massive clunking/bumping noise when I....

    Ok so, when I try to launch with traction control off, I usually rev up to 4000-5000 rpm and dump the clutch and the wheels start spinning but I hear 4 to 5 very loud clunks or bumps coming from under the car. Is this wheel hop? Or something else? What is causing this noise and what aftermarket parts can I purchase to eliminate this issue?

    I want to do some legally sanctioned 1/4 mile runs down at the track and would like to diagnose and eliminate this issue if possible before going there in the spring.

    Thanks,

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    He simply abides. SD_GR's Avatar
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    The rear diff and gearbox are mounted relatively flexibly. For the gearbox there are harder mounts; some where once homologated and so are still called "Group N." For the rear diff you can buy kits with bolts to secure it to the car.
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    Registered User speedtown's Avatar
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    probably mount problem. I know in my old speed6 my rear diff would make the most awful noise ever when taking off hard. I would say upgrade the different mounts and see if that helps, some of them are pretty flimsy. Maybe start with the tranny mount?

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    Registered User LENSPEC's Avatar
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    Yeah I've been looking around. It seems that some of the more popular things are group-N mounts and kartboy engine pitch mount. But I'm not sure how a pitch mount affects wheel hop. I got a lot more research to do it seems
    Last edited by LENSPEC; 12-30-2013 at 01:04 AM.

  6. #5
    Registered User LENSPEC's Avatar
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    And now after more research, I find many different types of mounts created by multiple different brands. This should be interesting....

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    be sure to let me know what u end up doing

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    MAINEiac 11blackSTi's Avatar
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    You want to check out turninconcepts.com

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    Registered User LENSPEC's Avatar
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    Quote Originally Posted by 11blackSTi View Post
    You want to check out turninconcepts.com
    oh damn....so many options that all appear to do the same thing.

    Is everything the same but with slightly different designs?

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    MAINEiac 11blackSTi's Avatar
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    If you are looking for rear diff look at the whiteline rear diff mount in cradle bushing. For the gearbox you can also look at whiteline positive shift bushing kit, and the group n transmission mount. Perrin also makes a rear diff lockdown kit.

  11. #10
    Registered User LENSPEC's Avatar
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    Quote Originally Posted by 11blackSTi View Post
    If you are looking for rear diff look at the whiteline rear diff mount in cradle bushing. For the gearbox you can also look at whiteline positive shift bushing kit, and the group n transmission mount. Perrin also makes a rear diff lockdown kit.
    great thanks,

    has it been said that perrin rear bushings are better or worse than the whiteline ones, or vice/versa ?

    thanks

  12. #11
    MAINEiac 11blackSTi's Avatar
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    Quote Originally Posted by LENSPEC View Post
    great thanks,

    has it been said that perrin rear bushings are better or worse than the whiteline ones, or vice/versa ?

    thanks
    There is not much to them. Both companies make good ones. It is all dependent on where you want your money to go.

  13. #12
    Registered User LENSPEC's Avatar
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    Quote Originally Posted by 11blackSTi View Post
    There is not much to them. Both companies make good ones. It is all dependent on where you want your money to go.
    True.
    In looking at both the whiteline and perrin rear diff insert kits, perrin seems much stronger.

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