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Suspension "whack!" when hard cornering.

This is a discussion on Suspension "whack!" when hard cornering. within the Suspension and Handling forums, part of the General Help category; I noticed this while on a track road course first, a fairly loud noise from the rear of the when ...

  1. #1
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    Suspension "whack!" when hard cornering.

    I noticed this while on a track road course first, a fairly loud noise from the rear of the when cornering hard.

    I jacked up the rear end, and there was a little play in the axle bearings at the wheels, and I blamed it on that. I had the axle bearings replaced, but I still get the noise when cornering hard, even on the street.

    I think it may be the Panhard bar hitting the exhaust system (which is not stock). It was rattling when starting up and backing out of the driveway and I put up with that, but this sounds dangerous.

    Does anyone have any input on what might be the problem or how to correct it?

    Steve Nix

  2. #2
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    happening turning a certain direction? Definitely sounds like the exhaust

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    Both directions....

    It happens when turning left or right, at high speed (track conditions). It is a little worse turning right.

    Steve

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    Senior Member Z28boy2000's Avatar
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    yeah id life the car up in the air and rattle around the exhaust just to make sure that its not hitting. sounds like the exhaust to me especially because it happens turning both directions
    2000 B4C Special Service Package Z28 - Kooks 1&7/8 Stepped 2'' - TSP Torquer V.2 - FAST 92/92 - BDR 4000 Conveter - Xtreme Trans Stage II - Full UMI Suspension - Pacesetter LT's - Comp Drag Shocks - Magnaflow - Cutout - ZO6 MAF - FTP LID - Street Tuned -

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    Member cant.b.caught.z28's Avatar
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    I'd say its a panhard bar problem.. Mine makes a clunking noise when i hit a bump in the road or a bad railroad track, and on a sharp turn.. and i'm pretty sure mine is caused by the panhard bar..
    I'm afraid of driving my car anymore until I get that replaced.. I don't want to do any other damage

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    Exhaust system adjusted....

    I went to a muffler shop, and they thought the problem was the whole exhaust pipe was just too low, and hitting on the panhard bar.

    Since the exhaust was definitely a little low between the front & rear wheels, and was hitting the panhard bar in the rear, they adjusted the whole system slightly higher.

    I still hear some rattling on start up and back up from the garage but have not been able to duplicate the "whack" of what I think was the exhaust pipe hitting the panhard bar. I have not had the real test yet of being on the track, but haven't been able to make it happen on the street yet, which is good!

    Thanks for the suggestions, I appreciate it.

    Steve Nix

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    Senior Member justinmc978's Avatar
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    sold: 1999 firebird
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    mine does this too, i'll have to take a look see to make sure im not doing damage

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    Member supercopone's Avatar
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    Quote Originally Posted by justinmc978 View Post
    mine does this too, i'll have to take a look see to make sure im not doing damage
    mine too, I wonder if this just something that coms with age

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    Senior Member justinmc978's Avatar
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    sold: 1999 firebird
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    Quote Originally Posted by supercopone View Post
    mine too, I wonder if this just something that coms with age
    or aftermarket exhaust, mine really does it more if i hit a bump too hard, havent noticed it turning so much

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    Member Blue28's Avatar
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    Check the rubber in the right rear exhaust hanger mount. Over time it wears creating slack in the mount. Also look for a shiny area on the over axle pipe to see if the axle is contacting the pipe.

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    Paid 2 Post Daycrew SexOnWheels's Avatar
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    When I had the same problem it turned out to be a broken bolt on the tranny at the tranny mount.

    The car 'banged' with every high speed corner at a road race track.

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    Thanks, I'll check that out....

    I'll have a chance this weekend to get it up on jackstands and check that out. I have my doubts, because they checked it out on a lift when they adjusted the exhaust system, and it seems to be coming from further back, but I'll pay special attention to the tranny mount.

    Thanks again for the suggestion.



    Quote Originally Posted by SexOnWheels View Post
    When I had the same problem it turned out to be a broken bolt on the tranny at the tranny mount.

    The car 'banged' with every high speed corner at a road race track.

  13. #13
    Moderator 35th-ANV-SS's Avatar
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    Quote Originally Posted by Blue28 View Post
    Check the rubber in the right rear exhaust hanger mount. Over time it wears creating slack in the mount. Also look for a shiny area on the over axle pipe to see if the axle is contacting the pipe.
    THIS.

    If your PHB is hitting the exhaust where it goes over the axle, you will definitely see a mark there.

    Mine hits too and I am considering the PHB lowering kit from UMI or BMR to create more clearance there.

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