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Ghianightmare
Spa-Francorchamps


Joined: 25 Apr 2017
Posts: 271
Location: Dublin


PostPosted: Sun Jan 20, 2019 8:13 pm    Post subject: Ride Harshness, tyre Pressures and Suspension bush age Reply with quote

This isn’t a eureka moment, but...

I found the ride on my C4S quite harsh. I found the threads related to a TSB to adjust tyre pressures and I dropped mine accordingly. The ride was greatly improved.

I replaced all off the suspension links in November and had the alignment done. The alignment Centre commented that they had to put a few pounds into each tyre. I explained why.

It was only today that I realized I hadn’t had to adjust the tyre pressures back down. The ride - obviously due to the new rubber bushes - is supple at standard factory pressure and 12 month old PS2s

So for those that find the ride in their cars quite harsh, just consider the age of suspension bushes, as while they may not be making any noise or knocks, the younges 996 Bushes are now 14 years old and will have lost their elasticity. Dropping tyre pressures will only mask the real issue.

Just food for thought for those unhappy with a harsh ride.
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2002 Seal Grey C4S
 
  
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 15764
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Sun Jan 20, 2019 9:36 pm    Post subject: Reply with quote

thumbsup
Sounds about right to me.
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2000 Manual 996 C4 Arctic Silver Convertible


 
  
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Bluebird911
Nürburgring


Joined: 29 May 2010
Posts: 443



PostPosted: Mon Jan 21, 2019 10:18 am    Post subject: Reply with quote

If your shocks are original try replacing those as well. My car had a harsh ride. I chased a number of things to improve it, but it was new shocks that made the ride compliant and took the edge off the 'crashiness' of the ride. They were OK to pass the MOT, but MOT does not test the full function of the shocks.
 
  
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DynoMike
Albert Park


Joined: 25 May 2012
Posts: 1530
Location: The Cotswolds

2003 Porsche 996 Turbo

PostPosted: Mon Jan 21, 2019 7:37 pm    Post subject: Re: Ride Harshness, tyre Pressures and Suspension bush age Reply with quote

Ghianightmare wrote:
This isn’t a eureka moment, but...

I found the ride on my C4S quite harsh. I found the threads related to a TSB to adjust tyre pressures and I dropped mine accordingly. The ride was greatly improved.

I replaced all off the suspension links in November and had the alignment done. The alignment Centre commented that they had to put a few pounds into each tyre. I explained why.

It was only today that I realized I hadn’t had to adjust the tyre pressures back down. The ride - obviously due to the new rubber bushes - is supple at standard factory pressure and 12 month old PS2s

So for those that find the ride in their cars quite harsh, just consider the age of suspension bushes, as while they may not be making any noise or knocks, the younges 996 Bushes are now 14 years old and will have lost their elasticity. Dropping tyre pressures will only mask the real issue.

Just food for thought for those unhappy with a harsh ride.





Yeah

The diagonal arms in particular made the the biggest difference on mine.
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2003 996 Turbo
Previous toy 1974 Mini 1000
 
  
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Ghianightmare
Spa-Francorchamps


Joined: 25 Apr 2017
Posts: 271
Location: Dublin


PostPosted: Mon Jan 21, 2019 8:57 pm    Post subject: Reply with quote

Bluebird911 wrote:
If your shocks are original try replacing those as well. My car had a harsh ride. I chased a number of things to improve it, but it was new shocks that made the ride compliant and took the edge off the 'crashiness' of the ride. They were OK to pass the MOT, but MOT does not test the full function of the shocks.


All 4 dampers and top mounts replaced a few months prior to replacing suspension arms. The biggest difference came when I replace all arms on all 4 corners.
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