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Old 09-25-2010, 06:01 AM   #1
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Bump Steer

I am experiecing steering wheel feedback from bumps and cracks in various road surfaces. I have replaced inner and outer tie rods, drop links and new shocks and strut bearings.
Any ideas on the cause of this condition?

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Old 09-25-2010, 06:22 AM   #2
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when did it start doing this ? how are the tires ? are the sway bars stock ? alignment good ? got milk ?
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Old 09-25-2010, 07:58 AM   #3
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Please elaborate on what you mean by "feedback".
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Old 09-25-2010, 02:45 PM   #4
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Question Bump steer

The feedback thru the steering wheel is a quick minor steering wheel pull when engaging a bump in the road. Car has brand new Conti Sport tires , stock sway bar.
Alignment performed recently and no problems found.
Could it be the rack?

JD BOXSTER
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Old 09-25-2010, 03:41 PM   #5
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How many miles did you put on those new tires???

http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=5
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Old 09-26-2010, 10:54 AM   #6
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Quote:
Originally Posted by JDBOXSTER
The feedback thru the steering wheel is a quick minor steering wheel pull when engaging a bump in the road. Car has brand new Conti Sport tires , stock sway bar.
Alignment performed recently and no problems found.
Could it be the rack?

JD BOXSTER
I have had control arm bushings do this as well as the valving in the rack becoming overly sensitive.

My first choice would be contol arm bushings, rack bushings if it has them, then the rack itself. I would carefully verify the rack valving is off by making slight adjustments on the steering wheel while at speed and notice the response. I would look for an over reaction in steering will little steering wheel adjusting.

You didn't specify but I assume, the new tires was to correct this problem heh.
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Old 09-26-2010, 04:51 PM   #7
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Have you checked the airpressure in the tires?

Is the car lowered from stock height?
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Old 09-28-2010, 10:24 PM   #8
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Bump steer is a "feature" of the Boxster, unfortunately.

If you're cornering over cement slabs, on a freeway overpass or on-ramp for example, as the rear suspension compresses the car will oversteer. I installed one of Pedro's super braces to combat this effect. It's better, but still there.

It's a side effect of the rear end being designed to understeer if you chop the throttle mid corner.

This is one of the things that made me decide to buy a Ferrari. I was pretty sure the it wouldn't do this. Sure enough, it doesn't. I still love my Boxster, but not as much in certain types of corners.
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