nfleuks14

they offer single and dual steering kits.....if i have a single on there right now can i upgrade to the dual? whats the difference between the two? sorry so many questions trying to fix my bumpsteer.....thanks guys

Matt16

Our IFS trucks shouldn't have bump-steer in their stock form because the tie rod is equal length to the A-arm.

Two will put more strain on the steering system. My guess is some component in your steering is badly shot and needs replacing. Check your idler arm.

nfleuks14

thanks

toyNG

from my understanding, steering stabilizers won't do anything in terms of bump steer. The problem is probably somewhere else.

Junkers88

OK (and I hate to ask this here) what the heck is "bump steer".

Just Learning

ditto what is bump steer

Yodaforce

Hit a bump, the vehicle wants to follow.

Jay351

Yeah, the solid axle guys can get that pretty bad...

Go with a single replacement and check your front end..

Idler arm should be the first to check!

Just Learning

ahh i see i got it

Matt16

Bumpsteer is the change in alignment upon the compression of the suspension. Homebrew SAS is quite susceptible to this.

I think his idler arm, ball joints, or tie rods are shot, leading to steering that is easily affected by ruts and bumps. A steering stabilizer masks this, but not well, and over time, the steering gets looser still.

abecedarian

bump steer as mentioned is when one wheel hits a bump and wants to turn, sometimes hard enough to pull the steering wheel from your hand.
any vehicle can experience bump steer and it's often caused by excessive positive toe, incorrect caster, oversized tires and/or wheels with minimal back spacing. as for IFS trucks shouldn't get bump steer, not completely true. toyota must've seen the need since nearly every truck and 4runner I've seen has or had a factory dampener.

nfleuks14- a good single dampener should be sufficient for your truck with up to 35" tires. you will likely not be able to start with one dampener then upgrade to two since the mounting brackets are different between the setups. You may be able to buy the single, then buy the dual mounts and a second matching dampener down the road though.
in my opinion, if you have bump steer, all the suspension components need checked and replaced if worn- ball joints, bushings, wheel bearings even; and an alignment performed as well once everything up front is in known good condition.
if that doesn't fix the bump steer, then look at dampeners.

Matt16

"Bump steer" is where the steering knuckle is pushed in or out as the suspension cycles due to an inherent poor design of suspension and steering geometry (i.e.: the tie rod arc is different from the A-arm arc). It is not when the wheel deflects off a rock, rut or log causing steering input. While Toyota IFS does not suffer the former, obviously no vehicle is immune from the latter, hence the steering stabilizer.

More on bump steer, a pictures worth a thousand words.

Stolen from this site: http://www.mustangandfords.com/techa.../photo_04.html

abecedarian

http://en.wikipedia.org/wiki/Bump_Steer:
jounce: http://dictionary.reference.com/browse/jounce
sounds like bump steer is caused by hitting bumps to me.

and call me a simpleton, but the name "bump steer" seems pretty self-defining.

space-junk

iTrader: (1)

abe, your a simpleton...

that good enough for ya?

Matt16

Reading beyond the first line in the Wikipedia article would be beneficial here. Bump steer is a tendency instead of an event. Why else would they measure it in "degrees per meter"???

abecedarian

bickering over semantics doesn't change the common vernacular and usage of the term nor its perceived effect, and understanding what it is doesn't rectify the original poster's situation in the least.

and if I wanted to get technical, solid axles generally do not have bump steer, they have roll steer... but if you'd read that whole wikipedia article you'd have learned that and corrected yourself as eagerly as you attempted to correct me.

Matt16

Yes, you are right, it seems solid axles have roll steer.

It didn't appear you understood what the mechanism behind "bump-steer", which is quite important to answer the OPs question, thus I corrected you, nobody insulted you, so stop being sensitive.

I think there's enough here to answer the OPs question, so discussion over.

abecedarian

I've been dealing with bump steer since 1987 when I lowered a 78 VW scirocco and encountered increased 'bump steer' due to altered steering geometry. Consider it the technical or slang. I've known exactly what it is for 20+ years. I knew what the OP meant, was trying to accomplish and offered advice as opposed to a lecture about geometry and semantics.

No one has insulted me in the least. So yeah, discussion over.