Go Back   986 Forum - The Community for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Performance and Technical Chat

Post Reply
 
LinkBack Thread Tools Display Modes
Old 09-25-2010, 06:01 AM   #1
Registered User
 
Join Date: Jun 2005
Location: CONNECTICUT
Posts: 22
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?

JD Boxster

2000 986 2.7

JDBOXSTER is offline   Reply With Quote
Old 09-25-2010, 06:22 AM   #2
Registered User
 
Join Date: Apr 2010
Location: trenton nj
Posts: 449
when did it start doing this ? how are the tires ? are the sway bars stock ? alignment good ? got milk ?
extanker is offline   Reply With Quote
Old 09-25-2010, 07:58 AM   #3
Registered User
 
Join Date: Jan 2007
Location: BC
Posts: 1,310
Please elaborate on what you mean by "feedback".
__________________
2001 Boxster, 5 spd, Seal Grey
clickman is offline   Reply With Quote
Old 09-25-2010, 02:45 PM   #4
Registered User
 
Join Date: Jun 2005
Location: CONNECTICUT
Posts: 22
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
JDBOXSTER is offline   Reply With Quote
Old 09-25-2010, 03:41 PM   #5
Registered User
 
Join Date: May 2008
Location: Toronto
Posts: 2,656
How many miles did you put on those new tires???

http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=5
ekam is offline   Reply With Quote
Old 09-26-2010, 10:54 AM   #6
Registered User
 
Join Date: Mar 2008
Location: NH
Posts: 110
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.
__________________
NH
Frank M is offline   Reply With Quote
Old 09-26-2010, 04:51 PM   #7
Registered User
 
BYprodriver's Avatar
 
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
Garage
Have you checked the airpressure in the tires?

Is the car lowered from stock height?
BYprodriver is offline   Reply With Quote
Old 09-28-2010, 10:24 PM   #8
Registered User
 
roadracer311's Avatar
 
Join Date: May 2007
Location: San Francisco, CA
Posts: 218
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.

__________________
2003 Boxster S
1995 Ferrari F355 Spider
San Francisco, CA
roadracer311 is offline   Reply With Quote
Post Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 07:56 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page