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964RS replacement trailing arm bushes

 
Old 03-09-2008, 09:36 AM
  #31  
jneteler
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What are the symptoms for worn bushings? How can you tell if you need them?

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J.G. Neteler
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Old 03-09-2008, 02:36 PM
  #32  
Anatol
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Originally Posted by jneteler View Post
What are the symptoms for worn bushings? How can you tell if you need them?

Regards,

J.G. Neteler
On my C2, I noticed that under very heavy cornering loads, like on a track, the car would make a distinct jerk like breaking away. However, it did not lose grip, it just moved in its bushes.

I had all rubber bushes replaced with ball joints and found the car far more precise and reassuring to drive. Then you could really lean on the car until the tyres would gradually run out of grip.

An aside: noise levels did not increase with the installation of the ball joints.

Did the same with my RS - and love it!

Steering control arm bushes can also wear. You notice it when the car needs two lanes during breaking. Go for the harder and more precise RS control arms.
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Old 03-09-2008, 03:26 PM
  #33  
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"Go for the harder and more precise RS control arms."

Control arms = wishbones or a-frames yes?
If so, the RS were no good for me, the rubbers split within 2 years/ 20K miles. Maybe that's a long time by some, but I was pretty p*ssed at having to spend ú800 again! Now I have had fitted the Powerflex poly bushes and they feel very good and expect them to last longer than the Porsche RS ones.
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Old 03-10-2008, 09:43 AM
  #34  
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"Steering control arm bushes can also wear. You notice it when the car needs two lanes during breaking. Go for the harder and more precise RS control arms."

I think Anatol talks about the steering forks, the first joint from the steering rack. they get really sloppy of age. I agree with Anatol, this is an upgrade worth doing and also un-expensive. I could bend my old ones how I wanted with my hands, the new fork was almost impossible to bend.
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Old 03-10-2008, 11:40 AM
  #35  
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I'm a little slow Thomas. What part are you talking about? Part 3 in the last picture?









hat tip to Pelican for allowing cross linking
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Old 03-10-2008, 12:34 PM
  #36  
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Number 3 in the last pic. The one that sists between the steering rack and the tie-rod. I think you guys call it a steering fork /tie rod fork or something.

the C2 version is the softest, the C4/RS/Turbo uses the same and are a little stiffer, and finally there's a Cup-version which is the stiffest. But the Cup-version is much more expensive (and not worth the money). They are all made with a rubber bushing and it goes really soft from age so even a new C2 fork will feel stiff compared to an old one. They are all the same except for the stiffer rubber so you can fit which one you want.
I'm not sure but I think I paid maybe 110 USD for a pair.
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Old 03-10-2008, 12:44 PM
  #37  
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Originally Posted by ThomasC2 View Post
I'm not sure but I think I paid maybe 110 USD for a pair.
Great info, thanks! $110 is the price at Pelican, I believe. Very good info to have. Thank you for posting about that. My 964 has 150K on the odometer so I am slowly replacing all the little rubber bits in the suspension and steering. I'll add this to my list.
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Old 03-10-2008, 01:34 PM
  #38  
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On my C2 the servo-assisted steering rack had been leaking all its life with me. Actually, I replaced the rack two months before selling the car...

The oil from the steering rack had been dripping onto the "tie rod" all the time, softening the rubber in the bushing to the extent that I really needed two lanes for high speed breaking. The difference with new tie rods was magic!
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Old 03-10-2008, 10:54 PM
  #39  
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Originally Posted by Cupcar View Post
The RS also has a thick washer built into the bushing package to eliminate motion, are you going to have this in your design?
Yes! It would be great to have the correct rear RS/Cup bushing with integrated washer. I would highly recommend this configuration to anyone wanting to eliminate rear toe correction to the rear of their 964, making the car feel more controllable. Also, it would be a great part to have for those of us racing Cup cars and needing to keep the car original. It would be great to be able to have the various racing organizations (like PCA) approve this part for racing.
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Old 04-06-2008, 10:17 PM
  #40  
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Originally Posted by NineMeister View Post
As a result of the 9mRS build program we are now looking into making alternative bushes for the the stock 964 arms. Two bush kits are proposed:
a) Equivalent stiffness to RS, which ultimately may be acceptable as an alternative to the RS arm for racing.
Please sign me up for a set ASAP!
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Old 04-23-2008, 06:44 PM
  #41  
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Any news on these yet?
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Old 04-24-2008, 09:25 AM
  #42  
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Thanks for asking, I have not forgotten, it's just that with current workloads I have been struggling to finish difficult projects in the workshop and keep the pressure up on my suppliers. In this case they are also at the other end of the country so it's not as if I could call in to chase them, but with a bit of luck I'll find the time to call them in the next few days and give you all an update.
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Old 04-24-2008, 09:36 AM
  #43  
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Just adding that I'd obviously also be interested in one or more sets for my Cup (should we also be able to get PCA to approve them as a replacement part).
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Old 04-24-2008, 10:21 AM
  #44  
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Interested in a set.
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Old 04-29-2008, 11:41 AM
  #45  
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Originally Posted by Cupcar View Post
The RS also has a thick washer built into the bushing package to eliminate motion, are you going to have this in your design?
Actually, I made a mistake trusting my memory, the RS actually has two 3 mm thicker washers to eliminate axial motion. From the factory RS technical guide:

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