Can big spacers cause bumpsteer?
07-25-09, 11:14 AM
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What is you effective offset with the spacers? They aren't causing bump steer in the technical sense, but a big scrub radius increase (like putting a 25mm spacer on a stock wheel) can lead to some odd steering characteristics.
07-25-09, 11:46 AM
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They could cause the pre-existing bumpsteer to be worse though, since it'll be acting on a larger radius, making the wheel move more, but I'd tend to agree that it's probably the scrub radius doing whatever you're feeling.
07-25-09, 02:52 PM
#4
hmm.. the car is lowered and the front wheels are 19x9.5 with a +45 offset + 25mm spacer and i def got some bump steer and is very annoying. i had to lowered my sway bar about an inch but i dont think this will cause the minor bumpsteer.. i think my spacers have something to do with it..
07-25-09, 09:40 PM
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07-26-09, 11:25 AM
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I run 25mm spacers (effective wheel offset of +27) and had to fight the wheel alot until I had the car properly aligned.
07-26-09, 03:56 PM
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If I'm getting my math right, your effective offset is 20mm. The 45mm with the wheels only is close to stock. It would be easy to take the spacers out to check and see if this is the root cause of your problems.
With 19" wheels you don't have much tire. Thus, your tires can't 'spring' and comply to the road much either. This may be part of the problem. What tire sizes are you running?
Several threads show different alignments for different wheel diameters, you may want to check these out and consider alignment changes. Also, may sure you aren't bottoming out the suspension since it's lowered; this makes the car misbehave badly.
With 19" wheels you don't have much tire. Thus, your tires can't 'spring' and comply to the road much either. This may be part of the problem. What tire sizes are you running?
Several threads show different alignments for different wheel diameters, you may want to check these out and consider alignment changes. Also, may sure you aren't bottoming out the suspension since it's lowered; this makes the car misbehave badly.
07-28-09, 01:12 AM
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It's nice to get a good improvement, with an easy change.
Tires can also have an effect: my 'other' car was having notable tracking issues that completely disappeared when I put on new tires; same size, different brand, not worn out.
Is the rest of the suspension tight?
Tires can also have an effect: my 'other' car was having notable tracking issues that completely disappeared when I put on new tires; same size, different brand, not worn out.
Is the rest of the suspension tight?
07-31-09, 10:49 AM
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bumpsteer is cause when the wheel travels up you get toe in or out, the spacer just magnifies the problem because of the scrub radius change, you might have some worn out joints that don't help things either with adjustable control arms you might be able to control the bumpsteer a little bit, but you need to get your scrub radius back to a normal amount. there are some lowtech ways of checking bumpsteer.
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