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Author Topic:   bump steer
tom waara
Dirt Roller

Total posts: 19
posted April 30, 2005 08:15 PM  
If you adjust your Bump Steer in the "straight ahead position", this isn't the same as Cornering, it Changes when The wheel is turned,at least on my car it does. Wouldn't you want minimal bump steer while in Mid turn?, counter steering? or what? anyone ever check that? who cares going down the straight.

bubba0six
Dirt Maniac

Total posts: 146
posted May 01, 2005 08:17 AM  
sounds to me you have bump steer and ackerman mixed up.

tom waara
Dirt Roller

Total posts: 19
posted May 01, 2005 07:05 PM  
[ I Don't think so , I'm saying "Checking" bump steer with the wheel slightly turned. NOT toe-out on turns. this changes your center link position, inner tie rod position, etc. Also if you compare the left front in "Sag" and the right front in compression, this is the most probable situation in the corner, with the wheels slightly to the right, not going straight. I don't think it's that Important What The right front does in sag and the left front does in compression. does anyone measure bump steer? or do you just talk about it? I did, with alghment heads and on a stock metric it toes in, in that situation even though the reading is Toed Out the toe out is because of Ackerman. Any Comments or Are All you guys lost.

stockcar5
Dirt Forum Champ
Total posts: 578
posted May 01, 2005 07:51 PM  
bumpsteer wont change as the wheel is turned. check it all you want you'll get the same results. unless you got some real fancy centerlinks and tie rods that can adjust themselves up and down going into the turns your wasting your time.

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tom waara
Dirt Roller

Total posts: 19
posted May 01, 2005 08:19 PM  
[QUOTE]Originally posted by tom waara:
[B stockcar5, your spindles steering arm goes in a upwards arc, ( as the wheel turns outward) this changes the outer tie rod height, this changes bump steer, unless you have some fancy fancy front end stuff on your car and your ball joints are straight up and down from each other and you dont run caster

stockcar5
Dirt Forum Champ
Total posts: 578
posted May 02, 2005 11:01 AM  
sounds like you are confused a little bit. a steering arm will change toe as you turn (ackerman) and toe will change with body roll (bump steer) you seem to be trying to intermix the two together and that wont solve much of anything. you need to correct both seperatly. you spliting hairs to much.

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bubba0six
Dirt Maniac

Total posts: 146
posted May 02, 2005 03:45 PM  
hey stockcar5 thats a fine looking racecar you have there!

tom waara
Dirt Roller

Total posts: 19
posted May 02, 2005 06:54 PM  
[QUOTE Stock Car5, I'm Not Talking about toe Out on turns, bump steer can be adjusted by the height of the outer tie rod end mounting point, this changes the starting point of the arc the tie rod goes though during suspension ok. for example if the tie rod is on a downward sloop (inner to outer) as suspension compresses, it has to toe out before it toes in (this is not taking in account the arc of the spindle itself) if you go in your garage and measure the spindle arm height at straight ahead the turn ten degrees, the spindle arm rises. the is not how toe out on turns is is factored. it is done because the spindle arms are pointing inward towards each other,

    

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