bump steer

[sponhower]

Anyone else have lowered truck and have problems with bump steer? Any fixes for this?

[sponhower]

Does no one have this problem except me?

[TwinTurboV8Ty]

How have you determined its truly bumpsteer?

[sponhower]

Just what someone told me. When going down the road the road conditions wil pull the truck around from side to side. Maybe I'm wrong on what the problem is. Any help would be appreciated.

[HopnDude]

Sounds like a potential Camber problem in the steering. How did you lower it?! Find some one who's been to Hunter Alighnment school, uses the new style alighnment machines and have him shoot spec's on your alighnment. See what it's at. Go from there.

[HopnDude]

Originally Posted by HopnDude

Sounds like a potential Camber problem in the steering. How did you lower it?! Find some one who's been to Hunter Alighnment school, uses the new style alighnment machines and have him shoot spec's on your alighnment. See what it's at. Go from there.

Him or Her. Theres a decent looking female who does Alighnments here in St Louis for Dobbs, Dobbs is kinda shiesty unless you know someone who works for them. But she did the Alighnment on my daily driver 02 Lancer OZ Ralley, and she did hella good on it!

Any way, comment still stands, have it put on alighnment rack, and spec's shot! Go from there, could also be loose suspension components!

[TwinTurboV8Ty]

I'd venture to say its probably not camber either.

I would guess you have a toe-in/out issue along with caster problems. Good alignment and put more caster than stock specs show will help. I like 6-7 deg of caster key being both sides are equal amount of caster.

I knew it wasn't bumpsteer as I have only seen 1 person here even come close to knowing how to measure bumpsteer and doing it. Most alignment shops don't even know how to do that measurement.

[HopnDude]

Hmm....I know Caster will not, for sure, cause bump steer. Caster is front to back wheel placement, if correctly alighned will not cause any issue, but would highly advise to get it fixed! This is where one wheels center point is farther forward or backward than the opposing sides.
Toe is the \ \---o---/ / or / /---o---\ \ of the wheel, might cause bump steer, but if only slightly out of alighn will wear the inner/outer edge of the tire over time, and is annoying and not very detectable.
Now if you lowered it, the suspension is a bit more stiffer than stock. And your wheels are now sitting cambered. Your gonna feel this! The wheels are in a bowed up position unless your riding a mexican hydrolic setup on hi, and they camber down (pitched in at the bottom). You'll have to look up pictures of this. I might even be able to find a picture w/ better depictions. But if your camber is out, and your ridinig stiff suspension down the road, hitting uneven pavement, or drops in pavement slabs (highway) then your gonna feel a little pull to one side or another every bump. I can promise you on this!

[TwinTurboV8Ty]

You might want to study suspension a bit more. Caster affects how a vehicle tracks down the road. Not that camber doesn't to some degree, or toe-in.

Not that I know anything about suspension design, in particular as it relates to syty's.

[HopnDude]

Yeah....I'm pretty sure. I've lowered a few vehicles for friends, went to Hunter Alighnment school as Dobb's paid for it. And I've done hundreds of alighnments....Last alighnment I touched was back in 2007 at Dobbs in Manchester, MO....so Sponhower, go get your shit on a rack and get it checked out!

[HopnDude]

[HopnDude]

Originally Posted by HopnDude

Camber over bumps w/ wide wheels, stiff suspension will cause it to veer left/right when hitting bumps like down roads/highways/etc.

Toe will pull to one side or another when driving down a road. You pull the wheel straight, it goes it's own way even after you correct it.

Caster, just play gay! No dice, you typically cannot notice/feel this. But it will screw w/ your turning radious and impare your handling in emergency situations, veering around a dead animal, pot hole etc. And in rain, can be very bad, all of these if not done properly can cause cerial issues! But get your shit on a rack, have it checked out!

[sponhower]

Thanks. I had it aligned less than a month ago that's why I thought there must be something else. I guess I'll try it again

[TwinTurboV8Ty]

Google works well it appears. Now that we have the definitions down of what they are, do you really know HOW they react?

Alignment schools are going to teach you how to read a computer screen and adjust a car to get in the "green zone". They won't teach you WHAT each does and how it affects things.

If you so desire though my background does include an engineering degree, and as part of that I took a 400 level college course on suspension design where we had to design are own complete vehicle suspension from scratch. http://vri.etec.wwu.edu/

On top of that I just may have designed a coil over suspension for the syty's a few years ago, produced many sets with probably way over a million miles on MY design. O yea, my own typhoon is all custom front to rear, I've raced it at the drag strip, open road course topping over 140mph, autocross, heck I am doing a road course/autocross in 2 weeks in it.

I know exactly what all 4 items of discussion are and how they affect how a vehicle handles. More so than "my lowrider go bumpty bump over the bumps"

[HopnDude]

:::facepalm:::....not even gonna argue man....not worth it....sponhower, get a printout of ur spec's, scan/post them....pretty plz!....