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severe shaking above 130mph

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Old 01-23-2011 | 01:40 PM
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severe shaking above 130mph
Help! my 996TT has developed severe shaking when driven over 130mph. I have had the wheels balanced but still the same.The rotors and pads are all good. Any one have any ideas of whats going on and how to fix. My local porsche dealership are of no help as they are unwilling to test drive the car at this speed.
 
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Old 01-23-2011 | 02:05 PM
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Check wheel bearings,wheel runout(trueness),cv joints(axles),drive shaft,tires(not just balancing,look for unusual wear ,bubbles,etc).
 
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Old 01-23-2011 | 03:19 PM
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nigelareynolds is infamous around these parts
thank you - i'll check them out
 
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Old 01-23-2011 | 07:23 PM
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Might be worth having the tires roadforce balanced...
 
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Old 01-24-2011 | 11:15 AM
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i would also start with front wheel bearings, they are known to go bad. check bushings
 
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Old 01-24-2011 | 11:25 AM
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are you running after market rims?
 
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Old 01-24-2011 | 01:57 PM
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Give the CV joints a good look-had 1 go bad on the rear w/ similar symptoms
 
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Old 01-24-2011 | 03:22 PM
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nigelareynolds is infamous around these parts
Hi
The rims are original, I have tried changing to a spare set of rims and tyres but this had no effect on the problem
 
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Old 01-24-2011 | 04:19 PM
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Might want to consider running on a dyno.
 
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Old 01-24-2011 | 04:30 PM
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Originally Posted by TurboTodd
Might want to consider running on a dyno.
OP: I have a AWD dyno if you're local to me.
 
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Old 01-24-2011 | 05:22 PM
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Do you know anyone that can switch the wheels with another set? That may help to rule out tires.
 
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Old 01-24-2011 | 06:26 PM
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Check your front control arm bushings. Not sure about 996's but this is a common problem with 993's.
 
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Old 01-25-2011 | 02:18 PM
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nigelareynolds is infamous around these parts
Thanks, I have tried switching to differnt wheels and tyres but this had no effect. I'm in the UK so its a bit far to travel to the USA to run on your AWD dyno - but thanks for the offer.
 
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Old 01-25-2011 | 02:43 PM
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Originally Posted by joetwint
Check wheel bearings,wheel runout(trueness),cv joints(axles),drive shaft,tires(not just balancing,look for unusual wear ,bubbles,etc).
good advice!
 
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Old 01-25-2011 | 03:01 PM
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Don't forget about your alignment.
 
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