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Old 04-17-2009, 11:13 PM   #1
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Bump Steer on the SVT

I am pretty new to my SVTF, I just purchased it last week. Today, in North Jersey, the weather was beautiful so I spent the day pretty much driving around running errands in my new toy. In doing so, I seem to have learned some issues with the stock factory suspension, that being bump steer. When ever I was on a constant curve and hit any kind of uneven pavement the steering wheel never stayed stable and wobbled over the bumps. Now by no means was it violent or unsafe but as an avid auto-crosser and track event participant this is an issue.

For anyone that does not understand the concept of bump steer, this happens when the tie rod ends are out of the suspension’s comfortable travel range. Bump steer is ultimately impossible to completely eliminate but can be managed with suspension travel settings.

Does any manufacturer makes any kind of adjustable height tie rod ends to help cure some of these issues I have found?


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Old 04-17-2009, 11:58 PM   #2
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This is a great question!
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Old 04-18-2009, 01:05 AM   #3
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if there is i sure havnt heard of it and that really is a good question because i noticed it myself.
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Old 04-18-2009, 02:04 AM   #4
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I think you might get better responses if this was moved to the suspension forum. Although i do notice what you mean. I deliver in my car and get that all the time.

Maybe if no one makes any that would be a good part for Jay Racing to try and make? Or some company for that matter.
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Old 04-18-2009, 07:05 AM   #5
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There is a guy on contour.org that makes custom adjustable endlinks; really beefy, attractive ones. The Focus uses pretty much identical links as the CDW-27; might be worth a look.
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Old 04-18-2009, 09:19 AM   #6
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Bump Steer on the SVTF

I posted this question in the SVT section already. I figured here would also be a good place to find a answer.

I am pretty new to my SVTF, I just purchased it last week. Yesterday, in North Jersey, the weather was beautiful so I spent the day pretty much driving around running errands in my new toy. In doing so, I seem to have learned some issues with the stock factory suspension, that being bump steer. When ever I was on a constant curve and hit any kind of uneven pavement the steering wheel never stayed stable and wobbled over the bumps. Now by no means was it violent or unsafe but as an avid auto-crosser and track event participant this is an issue.

For anyone that does not understand the concept of bump steer, this happens when the tie rod ends are out of the suspension’s comfortable travel range. Bump steer is ultimately impossible to completely eliminate but can be managed with suspension travel settings.

Does any manufacturer makes any kind of adjustable height tie rod ends to help cure some of these issues I have found?
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Old 04-18-2009, 09:31 AM   #7
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I have done a few searches on these forums and haven't really found anything. I posted in the suspension section and also emailed Jaysracing.com to see if they have anything.

I will post any information that I am able to find.
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Old 04-18-2009, 12:13 PM   #8
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How sure are you that it is the stock suspension? This would be more understandable if it has been lowered.
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Old 04-18-2009, 01:16 PM   #9
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Quote:
Originally Posted by dok View Post
how sure are you that it is the stock suspension?
100%
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Old 04-18-2009, 09:16 PM   #10
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Jay -

Before we go throwing parts at the car, let's talk a little about the wobble you experienced.

Like yourself, I spend a lot of time on the AX course and at track events in my SVT.

One thing that I've noticed is that any unsettling in these cars that is due more to ROLL STEER and issues with SLIP ANGLE as opposed to bump steer.

The tie rods and the suspension - even is stock trim, are pretty solid. That said, suspension modifications can offset these to some extent. However, to start simple, and match to your driving style...

Possible corrections (Having not driven the car):

- Increase the TOE IN (If possible, I would start with no more than .25 degrees, less is better)

- Tire pressure. Decrease by 1 pound to increase the friction coefficient and reduce the slip angle. The down side is that you will experience increased understeer

- Tire brand. Some are more grippy than others. The slip angle varies by manufacturer. Slip angle occurs when tread blocks become deformed under aggressive cornering while others remain intact.

In fairness, over the last three years, my SVT has been shod with Hoosier A6 or R6 tires. The only street time the car sees is to and from events. So, I experience less bump steer, roll steer and slip angle than most because *ahem* the racing surfaces are ALL perfect.

Not sure if this really helps you, but it's my personal experience.

Good luck!

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