Steering problem

[Riverside]

Porsche recommends upgrading the castor mounts to the 968 version if fitting wheels larget than 16", do that & get any other worn bushes replaced & it should transform the car. Cheaper method would be togo back to standard & get a better ride quality too []

 

[will87r]

HI
I have an 86 944, with 17" 911 wheels on it, and i ged very bas feedback when going over any bumps, the steering shakes badly, the bigger the bump, the more it shakes. is this because of the wheels? its there a solution, som sort of steering stabaliser? anybody else experience the same?
Thanks

 

[will87r]

Excellent, thanks for the advice!

 

[pauljmcnulty]

What Riverside said, just to add that the cars are very sensitive to tyre pressures and geometery. A proper 4-wheel alignment by an experienced expert can transform the car, and would be a good idea after fitting the 968 castor mounts.

 

[peanut]

ORIGINAL: pauljmcnulty What Riverside said, just to add that the cars are very sensitive to tyre pressures and geometery. A proper 4-wheel alignment by an experienced expert can transform the car, and would be a good idea after fitting the 968 castor mounts.

+1 .............You ought to check your track rod ends too. Jack one front wheel and holding it 3am and 9pm give the wheel a good hard wiggle . Any clonks or knocks would indicate that your trackrod ends are shot or your steering rack ball joint/s are shot or possibly the steering rack needs adjustment . If they are all ok I would check your front tracking next . Are you getting bump-steer at all when going over big bumps ?

 

[will87r]

Hi, the steering all checks out ok, it just seems to be the bigger wheels acting as a bigger lever to force feedback up to the steering wheel. What is the difference in the 968 caster mounts? also i would be interested in a break upgrade to the four pots like on a 968, are there any other models which would have somthing that would bold straight on to my car? thanks guys

 

[Riverside]

The castor mounts connect the back of the lower wishbone to the chassis. It's a doughnut of rubber mounted in a metal shell. The 968 version has less rubber & more metal so less deflection under load.

 

[barks944]

A lot of it is probably due to low profile tyres, much less side wall flex so the road can get more leverage on the steering rack. I believe the P/O fitted my car, also on 17" rims, with adjustable camber plates to help with this issue.