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VS Lukey exhaust SQUEALS when under torque with full car.

Discussion in 'VR - VS Holden Commodore (1993 - 1997)' started by kylo33710, Feb 5, 2013.

  1. kylo33710

    kylo33710 New Member

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    So, i baught a new Lukey cat back with rear muffler delete.

    I Put it on and then realized the shop forgot to send me a clamp, put it together anyway and sounds terriffic, no leaks even without the clamp.

    I can drive any way i want and it will be fine, but as soon as i have a full car and i put a certain amount of power the car makes an incredible screeching noise.

    it's actually ridiculous like a metal scraping metal noise although i doubt that is what it is. i'm guessing it has something to do with my exhaust when the rear suspension is under load. any one else experienced this?


    i will be putting clamp on within a few days which will hopefully fix it, or is it actually something else?
     
  2. kylo33710

    kylo33710 New Member

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    basically it squeals when the back of the car bogs down enough AND when the exhaust is droning at the same time
     
  3. yZoH

    yZoH //There Ain't No Rest For The Wicked...

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    Have you thought about looking underneath the car?

    Cheers
    Mat
     
  4. kylo33710

    kylo33710 New Member

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    i can't tell if you're being sarcastic or not haha, but yes i have but i have no idea as it only does it under load with a full car and it's hard to look under a car while it's accelerating :)
     
  5. yZoH

    yZoH //There Ain't No Rest For The Wicked...

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    Deadly serious, None of us can see your car.

    None of us know how you installed it and if everything is mounted properly and straight or if you have fatigue in suspension components on your vehicle.

    A question like this is like asking someone else what's in your own fridge.

    Cheers
    Mat
     
  6. NFNSUS

    NFNSUS Member

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    ^

    Can you guess what is in my fridge?
     
  7. kylo33710

    kylo33710 New Member

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    as far as your concerned - exhaust is installed correctly (minus the clamp for the rear tailpipe) and my suspension is fine, i was hoping to find someone who has had the problem before or knows what it is.. not someone telling me they don't know whats in my fridge.

    easier question: would not installing the clamp for the rear tailpipe cause random exhaust leaks under load that sounds like my wheel bearing has razor blades in it.
     
  8. ephect

    ephect Donating Member

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    remove rear tailpipe and test with fully laden vehicle.. will tell you if its the clamp issue..

    if not then look under the car to see if anything is close to suspension components
     
  9. Kiddo

    Kiddo You're serious bro?!

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    Could it be that with 3 people in the back, its laden enough that the exhaust is rubbing on a moving part?

    Get three people to sit in the back, and have a look under. I don't see how a single clamp can do such a strange thing.
     
  10. yZoH

    yZoH //There Ain't No Rest For The Wicked...

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    As far as I'm concerned? You are ADORABLE!

    Just went back through your posts,

    You are running old RE92 rubber, You Think ultra lows & 20's are a "Handling" option and you made a bunch of threads about removing your old exhaust let alone fitting this new one.

    And you tell me your suspension components are fine and the exhaust is installed properly,

    If that is the case you have nothing to worry about and the noise is in your head.

    Cheers
    Mat
     
  11. Not_An_Abba_Fan

    Not_An_Abba_Fan Exhaust Guru

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    Fit a clamp and stop the rear pipe from moving. You think it's not leaking, but it is. The noise will most likely be the front muffler moving across and hitting the tail shaft. The exhaust will move under acceleration, and with a loaded car, it will drop the body down so that the muffler is in line with the tail shaft. Get under the car and look at the inside of the muffler where it runs next to the tail shaft, I bet you will see marks on the muffler and the tail shaft.

    Fit the clamp and tighten it up to stop it all moving. The front muffler is only held to the cat by spring bolts, it will move.

    If it isn't hitting the tail shaft, it will be the mountinmg pin on the outside of the muffler hitting against the lower control arm. Another common thing if the exhaust hasn't been fitted properly or there is no clamp.
     
    mummbles likes this.
  12. kylo33710

    kylo33710 New Member

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    Suck a dick, since i lowered my car and put 18s on it even with **** rubber its 10x better handling
     
  13. Munz

    Munz Right Foot Action

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    I feel a ban coming on
     
  14. Kiddo

    Kiddo You're serious bro?!

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    No need to have a tantrum now young fella
     
  15. PaRaDoX

    PaRaDoX Because Racecouch...

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    [​IMG]
     
  16. RUF-60L

    RUF-60L Donating Member

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  17. PaRaDoX

    PaRaDoX Because Racecouch...

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    Don't forget the 18s.... because racecar!

    I'm surprised you haven't lost half the exhaust on the road and i'm even more surprised you decided to install it missing a clamping that holds the whole thing together.

    So how can we honestly take your word as fact that
    A) Your suspension is fine (did you even fit a adjustable panhard rod?)
    B) You installed it correctly (obviously you didn't)
    C) There is no Exhaust leaks (because there will be)
    D) It handles 10x better when lowered.

    I'll say this once and ONLY once.

    As your car is a 95 VS exec it will have what is called live axle rear suspension which uses a panhard rod to keep the diff centered when the suspension is compressed.
    If when you lowered it you did not fit a adjustable pan-hard rod the entire axle will be off center when the suspension is loaded (IE. 5 occupants)

    The further the suspension is compressed the further over the diff moves (i believe to the passengers side/the side the exhaust is on), so when its sitting in the driveway without anyone in it of course it is going to look fine.

    Now the new exhaust may have a different sized muffler or may run piping in a different way to the factory system. I'd put money on the exhaust knocking on the diff.

    Back in my youth i had a VN with ultra lows, i had knocking issues until i fitted an adjustable panhard rod which resolved my issues.

    I'd say your problem is a combination of an exhaust leak and the exhaust knocking on the diff.

    Now stop insulting people who you are asking help from, you'll get it in return 10 fold.
     
    Last edited: Mar 6, 2013
  18. Not_An_Abba_Fan

    Not_An_Abba_Fan Exhaust Guru

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    So did you find out what was making the noise?
     

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