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Old 09-07-2010, 05:40 PM   #1
The_ManCub
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Default BumpSteer Help

Good Evening,
Ill start with the specs of my car...
*2006 wrx--60k
*04 spec gf210's on stock struts/tophats
*stock camber bolts
*WL adj 24mm FSB, WL 22adj. RSB + Kboy endlinks on all 4
*17x8 wheels w/ 245/45 tires.- under 3kmiles

The problem I'm having with the car is that it seems to be "following" the crown of the road or any uneven road surface pretty aggressivly. Now it only has been doing this once I received an alignment from a highly reguarded shop( max neg camber f/r, 0 toe all around) and once I put on the wider wheels/tires.
I've been playing with the settings on the RSB and put it on full stiff and the issue is even more pronounced as opposed to softer settings for the rear bar...not to sure why this is but someone may know. My stock struts seem to be holding up just fine..no clunking/weird noises...I know WL sells a bumpsteer kit I believe and may have to buy those and restore the loss of suspension geometry.

Anyways not sure why Im having this issue with bumpsteer...maybe its the wider tires grabbing everything but if someone had some input it would be greatly appreciated...



Cliff Notes:: Bumpsteer with above mods...why am I having this issue? and how do I fix...
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Old 09-08-2010, 03:17 AM   #2
CPC
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Quote:
Originally Posted by The_ManCub View Post
*2006 wrx--60k
*04 spec gf210's on stock struts/tophats
*stock camber bolts
*WL adj 24mm FSB, WL 22adj. RSB + Kboy endlinks on all 4
*17x8 wheels w/ 245/45 tires.- under 3kmiles

Cliff Notes:: Bumpsteer with above mods...why am I having this issue? and how do I fix...
The main issue is probably the wide tyres (especially on the 8" rims). You may be getting some actual bump steer, the results of lowered springs, but it wouldn't be that bad. It's also possible the toe isn't as close to zero as you'd like. If it's towing out, especially with those tyres, you'll get the problem you describe.

Chris.
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Old 09-08-2010, 03:57 AM   #3
Arnie
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What you are feeling at the wheel is technically not bump steer, its actually "tramlining". The front wheels following the cambers and grooves on the road like a tram follows its tracks. This is caused by your wider wheels and tires, your tire type as well as your alignment. More negative camber tends to bring out tramlining on cars. The car will want to follow every groove in the road. Toe out will also contribute to this.
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Old 09-08-2010, 05:56 AM   #4
stidoc
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Arnie is correct (of course). This is your answer, not bumpsteer, and it is the price of increased neg camber up front and wider wheels, but you should also make sure your toe is 0.
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Old 09-08-2010, 12:45 PM   #5
The_ManCub
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Default

Hey guys appreciate the input!
I just never found anything specific on this issue with all the wide tire/ lots of neg camber people driving around. I'll go back to the alignment shop and double check my specs( free alignments for a year) and make sure its correct. I suppose I'll just deal with looking drunk on this strip of road thats pretty much shaped like a camels back...

Thanks Again!
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Old 09-08-2010, 01:02 PM   #6
Big-E
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Consider installing a roll-centre kit such as the one from Whiteline: http://turninconcepts.com/product_in...roducts_id=399
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Old 09-08-2010, 01:10 PM   #7
antonch
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Quote:
Originally Posted by Big-E View Post
Consider installing a roll-centre kit such as the one from Whiteline: http://turninconcepts.com/product_in...roducts_id=399
He doesn't need it.
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Old 09-09-2010, 02:38 PM   #8
Big-E
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Quote:
Originally Posted by antonch View Post
He doesn't need it.
Why?

I had the same problem after having lowered my car and the roll-centre kit effectively fixed it.

Just asking.
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Old 09-09-2010, 10:10 PM   #9
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Quote:
Originally Posted by Big-E View Post
Why?

I had the same problem after having lowered my car and the roll-centre kit effectively fixed it.

Just asking.
I've seen the bump-steer profile for the GD chassis. Bump steer is non-existent unless your car is slammed or running increased caster.
Notice that the product is being marketed as a roll-center kit and NOT a bump-steer kit.
I thought I had a bump-steer problem. My car was pretty low. I really did try to convince myself into buying BJ adjusters, but then I determined that it was my tires tracking the road.
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Old 09-10-2010, 12:52 AM   #10
ButtDyno
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Quote:
Originally Posted by The_ManCub View Post
I'll go back to the alignment shop and double check my specs( free alignments for a year)
They're only "free" if they actually deliver a car to your specs.

A lot of folks at those places don't care. Make sure you hold them to it.
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Old 09-10-2010, 05:08 AM   #11
sleepyfu
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Wide wheels def. amplifies tramlining. as for alignment on a street driven wrx, I highly recommend trying toe in. I have toe-in on front and rear, but you may want to start with just the front.
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Old 09-10-2010, 11:54 AM   #12
antonch
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What tires are you running?
While suspension geometry changes help with tramlining, some tires just tramline worse than others do.
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Old 02-11-2013, 11:18 PM   #13
sponaugle
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This is an old thread, but something I am looking at right now. I have been running 275s on my 08 STI since 08, and recently switched to 285s. The larger width tires has always made the car a bit 'twitchier' .

I recently had an alignment, and the toe-in is set to 0, and front and rear camber is -2 degrees.. It seems a bit worse then in the past, and under hard acceleration (especially in 3rd) it feels like the front end increases in 'dartiness'. ( a very technical term ).

I am considering adjusting the front end toe-in. I am curious if anyone has a recommendation of how much toe-in would be a good start.

Jeff
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Old 02-12-2013, 12:08 AM   #14
Uncle Scotty
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start with one half turn, each side....increase until it is obviously too much, and back off a turn

i have the same issue, different reason, and increasing positive caster seems to help a bit
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Old 02-12-2013, 12:20 AM   #15
sponaugle
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Quote:
Originally Posted by Uncle Scotty View Post
start with one half turn, each side....increase until it is obviously too much, and back off a turn

i have the same issue, different reason, and increasing positive caster seems to help a bit
Thanks Uncle Scotty. I'll give that a try. It has been a few years since hanging around on NASIOC, but it is nice to see familiar screen names.

Cheers

Jeff
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Old 02-12-2013, 12:48 AM   #16
Uncle Scotty
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Quote:
Originally Posted by sponaugle View Post
Thanks Uncle Scotty. I'll give that a try. It has been a few years since hanging around on NASIOC, but it is nice to see familiar screen names.

Cheers

Jeff
and you are much missed here, mon ami

and i have found that...for the gd chassis, anyway....that ANY toe out in the REAR makes for a real twitchy ride....i usually try to get just a lil when i do my alignments....and sometimes the tire used will cause more or less sensitivity to this
i run the federal 595rs-r's and they are quite responsive to input

did you change tire type/brand??
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Old 02-12-2013, 06:34 PM   #17
williaty
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Holy ****, now there's a screen name I haven't seen in a long time!

With regards to the twitchy, your suspension bushings make a big difference. These cars have ****ty ability to hold a dynamic alignment when their bushings are squishing all over the place. This is especially bad, as Scotty notes, if you've got any toe out on the rear end.
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