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Wheel hop every time rear wheels spin..Clutch slip.

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I'v done some quick launches in my 03 996tt 35K. Whenever I floor it or launch and the rear wheels spin i get the back end banging up and down. shaking the howl car like it's going to fall apart!! i'v got 997 19's on since i got the car could this be the problem, wheel size etc.. what makes the rear wheels bang up and down.. are my shocks buggered.. the wheels never just seam to spin they just bang and bang some more forcing lifting off and hopeing that nothings fallen off.

And a clutch question..

As i'v been launching the car i'v found that if i drop the clutch at say 3 to 4000 rpm most the time i just get the above hoping and we're off. but some times i get the clutch just slipping and then the horrible smell.. why does it some times slip and the rest of the time grab and launch..does reving higher in the rev range put so much power through the clutch that it just cant grab. or is it how i'm letting off the clutch.. Of coarse it could just be the clutch is on the way out but i would think it woyld do it more and more often...Anyone any wiser on the above??

I know it's not good to lauch the car but i'v had it for six months of Scottish rainly driving and nothing but pure no traction launches and adding a bit of power and getting drift action.... now it's dry i'm finally able to scare myself with the trully savage pull of the tt. youve got to do it at some point of owning one right!!


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