1st Gen R53 Cooper S Most liked posts in thread: Help: grinding noise when accelerating hard....

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  1. Redbeard

    Redbeard JCW: because fast is fun!
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    #60 Redbeard, Mar 25, 2011
    281 Motorsport? Is there a Mustang in the shop there?
     
  2. CheckersSD

    CheckersSD New Member

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    #61 CheckersSD, Mar 25, 2011
    I don't know. The sign says dynojet.


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  3. CheckersSD

    CheckersSD New Member

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    #62 CheckersSD, Mar 26, 2011
    While my car was up on the lift there were marks on the bottom of the cat as well as the top of the x-brace. Even though there is about an 1/8" clearance, the vibration from the exhaust is definitely contacting the x-brace. Even with the new bushings and new upper motor mount, during hard acceleration there is still vibration. I am going to buy some washers or spacers and place them between the x-brace and the frame. Or I might take a dremel to shave off some trimming on the brace or cat to make extra room. I will update as I move along with this project.
     
  4. CheckersSD

    CheckersSD New Member

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    #63 CheckersSD, Mar 26, 2011
    Here are some pics of the old motor mount. You can also see where the fluid splattered on the side of the engine.

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    [ame=http://www.youtube.com/watch?v=IiTr99OJ4EA]YouTube - IMG_1123.MOV[/ame]

    I am glad the engine mount has been replaced. Now I need to clean the engine bay. Any suggestions?
     
  5. Metalman

    Metalman Well-Known Member
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    #65 Metalman, Mar 26, 2011
    Yeah, what mini_racer said.....
    And don't rub too hard on the body paint inside the engine compartment, as it doesn't have the protective clear coat and tends to come off easily.
     
  6. Crashton

    Crashton Club Coordinator

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    #66 Crashton, Mar 26, 2011
    Yes like has been said don't wail on the cat with a hammer. You will breakup the inside. Best clearance that ill-fitting X brace thing. Use the hammer on the old engine mount. ;)
     
  7. CheckersSD

    CheckersSD New Member

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    #67 CheckersSD, Mar 27, 2011
    Definitely will keep the hammer away from the cat. What size spacers? Should I use metal washers or rubber type bushings?


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  8. Crashton

    Crashton Club Coordinator

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    #68 Crashton, Mar 27, 2011
    I'd use metal ones. Rubber ones will crush when you tighten things back up.
     
  9. mini_racer

    mini_racer Well-Known Member

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    #69 mini_racer, Mar 27, 2011
    Last edited: Mar 28, 2011
    Absolutely right........... only metal, if you use rubber you will defeat the chassis stiffening effect of the X-brace.
    So, use metal and I would not go thicker than the thickness of the X-brace mounting tab, and roughly the same (X,Y) dimension as you do not want to compromise the value of the X-brace. This is one of those smaller things to try so you will be real lucky if this completely remedies the issue. The good thing is that this is easy to try as you do not have to touch the front mounting bolts, just remove the rear bolts and slip in your spacers/ thick washers/ etc. and reinstall the rear bolts. If still not enough clearance than drop it and start grinding.

    Hey, did I mention that front most support on the catback? Verify it is doing it's job. :^)
     
  10. CheckersSD

    CheckersSD New Member

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    #70 CheckersSD, Mar 27, 2011
    Perfect. How much clearance is acceptable for the space between the xbrace and cat, like 1/2" or 3/4"?
     
  11. mini_racer

    mini_racer Well-Known Member

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    #71 mini_racer, Mar 27, 2011
    My view is if you go this thick:
    1. You will need to get longer bolts.
    2. You will compromise the effectiveness of the X-brace chassis stiffening.
    3. You will significantly reduce your rode clearance and hit it much more more often.

    To me, 1/4" would be the absolute max extreme on the spacers. Of course........YMMV.
     
  12. CheckersSD

    CheckersSD New Member

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    #72 CheckersSD, Mar 28, 2011
    Makes sense. The contact point on the x-brace is on the solid bar portion. I think the spacers will work fine. Thanks.
     
  13. Mr. Jim

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    #74 Mr. Jim, Apr 2, 2011
    Sweet :Thumbsup:
     
  14. Crashton

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    #75 Crashton, Apr 2, 2011
    That was easy! Glad you worked it out.
     
  15. mini_racer

    mini_racer Well-Known Member

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    #76 mini_racer, Apr 2, 2011
    Congrats on the fix!
     
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