Bump Steer - Suspension and Brake Forum

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Bump Steer
Tuesday, May 07, 2013 10:01 AM
Hi, I have an '02 pontiac sunfire that I race at a local short track. Ive lowered it as far as I could drop it. In fact I actually had to raise the motor to keep the half shaft from hitting the timing cover lol. So naturally this affects bump steer. I was wondering if there was a special spindle I could buy to reverse these effects, or some type of tie rod that I could buy thatís adjustable. Ive thought about moving the steering rack but its not naturally placed on the fire wall in a sunfire. And before anyone gives me a hard time about safety just remember Iím in a ďrace carĒ with a full roll cage, a racing seat and, im strapped in by a 5 point seat belt. Any ideas or products would be helpful.

Re: Bump Steer
Tuesday, May 07, 2013 10:27 AM
I've seen something on here that actually raised the point that the tie rod bolted to the knuckle, but I don't remember who had them.


- Your not-so-local, untrained, uncertified, backyard mechanic. But my @!#$ runs
Re: Bump Steer
Tuesday, May 07, 2013 2:02 PM
Oedwards wrote:

I've seen something on here that actually raised the point that the tie rod bolted to the knuckle, but I don't remember who had them.


OEM or Driving Force Fabrication. Im not positive if hes still producing these but it doesnt hurt to ask. Contact Mark or Jeffie. They should be able to help you out.



Re: Bump Steer
Wednesday, May 08, 2013 6:16 AM
There are quite a few parts available from Speedway or Afco, etc that will do it. I've even seen tie rod flip kits for Jeeps that can be used. All you need is the machined sleeve, a rod end, and a bolt.
.



Re: Bump Steer
Wednesday, May 08, 2013 6:41 AM
We do have a bump steer kit, Works great. we have a specialty machined sleeve that fits into the existing knuckle so no modifying is needed. Here are some pics. We might be running a GB on these here in the next month or two.

mark





http://www.overkillengineeringmotorsports.com/
Re: Bump Steer
Thursday, May 09, 2013 2:11 AM
What's the taper on the sleeve? How much for a pair of them?
.



Re: Bump Steer
Thursday, May 09, 2013 2:27 AM
ty for all your help btw
Re: Bump Steer
Thursday, May 09, 2013 8:49 AM
DFF- Breaking The Boundary wrote:

We do have a bump steer kit, Works great. we have a specialty machined sleeve that fits into the existing knuckle so no modifying is needed. Here are some pics. We might be running a GB on these here in the next month or two.

mark




I am excited for this!





BeardLife / Club Awesome Reject Blog
Re: Bump Steer
Friday, May 10, 2013 6:09 PM
i have this kit, but dont recommed installing it in the reversed position.
Re: Bump Steer
Saturday, May 11, 2013 11:40 AM
Spencer, shoot up some pics. Maybe because I have the N body knuckles that the work great underneath. I am very curious.


Mark


http://www.overkillengineeringmotorsports.com/
Re: Bump Steer
Saturday, May 11, 2013 8:37 PM
here is the kit installed on the bottom of the knuckle. after two alignment shops and a very scary highway drive to an indianapolis show i found the underneath position to be very undesirable. Amplified my toe issues and made the car very twitchy, a pronounced bridge joint pulled me across three lanes of traffic, thankfully the lanes were open. Granted that my car is adjustable and will created toe issues in itself, these mounted in that position casued the tires to squeel while driving in a straight line even with minimal changes to ride height.




however , these installed in the factory position makes for a wonderful product. i have had these a couple years now. and once on the top again the alignment issuse went away and they work perfectly for their intended purpose.

Re: Bump Steer
Friday, May 17, 2013 9:45 AM
I have 10 of these ready to be in the works. All Aluminum, anodized and what not. I have to wait till I get a few more water outlets sold.

Mark


http://www.overkillengineeringmotorsports.com/
Re: Bump Steer
Friday, May 17, 2013 9:56 AM
What purpose does it serve to mount it below the knuckle vs factory position?



Re: Bump Steer
Friday, May 17, 2013 10:05 AM
When you lower your car you will noticed that the steering knuckle goes up as well. What these do is allow you to mount the tie rod ( heim Joint) back to a factory position to cancel any bump steer out.

Mark


http://www.overkillengineeringmotorsports.com/
Re: Bump Steer
Friday, May 17, 2013 11:01 AM
What kind of a drop are these good for? I'm not slammed on the ground but I am about 1.6" lower than stock in the front. Would these be overkill (heh, no pun intended) or do you think they would actually help me out?



"In Oldskool we trust"
Re: Bump Steer
Friday, May 17, 2013 12:09 PM
Just look at your tie rods, are they straight? remember when you suspension gets compressed everything goes up not down.

Mark


http://www.overkillengineeringmotorsports.com/
Re: Bump Steer
Monday, May 20, 2013 9:08 PM
James Cahill wrote:

What's the taper on the sleeve? How much for a pair of them?
.




Re: Bump Steer
Tuesday, May 21, 2013 12:55 AM
Thatís another problem every car is lowered to different ride heights, can I order a custom pair? And can I get them in something more durable than aluminum? Does anyone on this website know how to use a bump steer gauge?
Re: Bump Steer
Tuesday, May 21, 2013 5:15 PM
Sam Braun wrote:

Thatís another problem every car is lowered to different ride heights, can I order a custom pair? And can I get them in something more durable than aluminum? Does anyone on this website know how to use a bump steer gauge?


Is that a rhetorical question? Because theres a homemade bumpsteer gauge in JuicedZ4s thread in P&M.



Re: Bump Steer
Tuesday, May 21, 2013 7:05 PM
mine from OEM arent aluminum.

Re: Bump Steer
Wednesday, May 22, 2013 6:13 AM
Spencer wrote:

mine from OEM arent aluminum.


Correct, yours are steel. They can be made out of aluminum without any issues.

Mark


http://www.overkillengineeringmotorsports.com/
Re: Bump Steer
Wednesday, May 22, 2013 7:03 AM
Not taking anything away from the product in and of itself, here is where bumpsteer is a problem:

The tie rod should remain as parallel to the control arm, and axle shaft as possible throughout the range of movement. In the picture Spencer posted, you can see that this is not the case. This is why he had more issues with it flipped underneath.

Where is makes sense to flip this is if you use a ball joint extender to level your control arms at the same time. The flip moves it too much otherwise.





Re: Bump Steer
Wednesday, May 22, 2013 7:05 AM
Mr. Quick wrote:

Not taking anything away from the product in and of itself, here is where bumpsteer is a problem:

The tie rod should remain as parallel to the control arm, and axle shaft as possible throughout the range of movement. In the picture Spencer posted, you can see that this is not the case. This is why he had more issues with it flipped underneath.

Where is makes sense to flip this is if you use a ball joint extender to level your control arms at the same time. The flip moves it too much otherwise.


This is because its on jack stands. Once he lowered the car the tie rods should have straightened out.

Mark


http://www.overkillengineeringmotorsports.com/
Re: Bump Steer
Wednesday, May 22, 2013 10:06 PM
so i dont understand... if the point of mounting them on the lower section of the knuckle is to take care of bump steer, why did spencer's have issues? and whats the point of doing it if all you are going to do is mount them on top again anyway? besides the obvious weight savings of them being aluminum anyways...

now, i already have aluminum heim jointed tie rods, just dont have this fancy kit to mount them differently... which again, seems to make no sense to me as to why.



M45/OS crank/2.4 snout. It's nice to be injected but I love being blown!
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