So what is buymp steer.  Well, bump steer refers to changes in wheel alignment (i.e., toe, camber and caster) as the wheel moves through the suspension range. Steering is effected resulting from toe or camber changes as the suspension moves up and down. Wheel alignment and general geometry is set with the car stationary, so bump steer affects must be properly considered to ensure that suspension movement does not cause adverse changes in handling or grip.

Ideally there would be no change of toe as the suspension is raised or lowered.  Bump steer is often the cause of that unexplainable wiggle or twitch.  Getting the suspension right to minimise bump steer is the difference between a good car and an excellent handling car.

On a lowered 911 you will want to to get the tie rod back up level with the steering rack.  This could be done by heating and bending the tie rod, or you can use one of the emerging bump steer kits which effectively do the same thing.

thanks for the help pete, i want to find out about the DIY OPTION as well , i e the spaers under the rack  any one any idea on this ? i'm still looking for a cheap stut brace for a 3.2 if anyone know ?
regards

My personal favorite is this kit from Rebel Racing:



A simple yet functional design.

/Peter

Hi all, newbie here. My car is lowered by 30-40mm (by previous owner), it has turbo tie rods fitted to the front, which i was told by a reputable P-specialist (GT-One) that is the necessary fix for such low front running.

Should i also be having a bump steer kit fitted or are the turbo-tie rods enough ?

I have turbo tie rods and they will only serve to tighten things up a bit at the front and they will last longer too over the originals.

As you lower the car the need for bump steer kits start to increase.  How does she feel to drive at the moment.  If she's handling OK then maybe leave her as she is. 

If you plan to have the geometry all setup, then you might spot any changes to the geometry that might warrant a bump steer kit.

Car manufacturers "dial in" bumbsteer on their cars to make them more driveable and safer for the general customer, wheras in Racing cars we try to completely eliminate it, I guess what I'm trying to say is that if you use your car for the road only, the guys at Porsche are pretty clever and you should only be concerned if you are experiencing unusual characteristics and then go to someone who knows what they are doing and has the kit necessary.

Ride height, track, camber, castor etc are critical to your baby's well being and best left alone unless you have the correct kit and know how.

Sorry, dodgy spelling in last post, don't think any car has "bumbsteer"...!!!

Quote: NickH at Nov 02, 2010 8:22:26 pm

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Sorry, dodgy spelling in last post, don't think any car has "bumbsteer"...!!!

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Some do