Go Back   Dodge Ram SRT-10 Forum - Viper Truck Club of America > Viper Truck SRT-10 Discussion > General Discussion
Home Forum Register FAQ Members List Social Groups Calendar Garage Mark Forums Read

General Discussion

Bumpsteer ?


This is a discussion on Bumpsteer ? within the General Discussion forums, part of the Viper Truck SRT-10 Discussion category!
Can someone explain / define "bumpsteer"?...




Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 01-14-2007, 02:42 PM
BlackViperRam04's Avatar
Member
 
Join Date: Jan 2007
Location: Virginia Beach
Age: 36
Posts: 177
Member #1024
Bumpsteer ?

Can someone explain / define "bumpsteer"?

__________________
Dennis
04 SRT-10 - (471HP, 499TQ) Bassani Headers, JMB Catless mids, Magnaflow catback, JMB CAI and catch can, debagded JMB powdercoated EVERYTHING, 170 t-stat
2005 Dodge Magnum RT - Borla catback, K&N cold air intake
1971 Chevy C10 - Longbed, 20" Centerlines, shaved door handles, full air ride suspension, phantom billet grille, flame thrower exhaust, 383 with 2x4's on a cross ram intake
Reply With Quote
  #2 (permalink)  
Old 01-14-2007, 02:47 PM
Member
 
Join Date: Jul 2006
Location: Indianapolis
Posts: 143
Member #385
I can"t - - I'll get in trouble
Reply With Quote
  #3 (permalink)  
Old 01-14-2007, 02:58 PM
BlackViperRam04's Avatar
Member
 
Join Date: Jan 2007
Location: Virginia Beach
Age: 36
Posts: 177
Member #1024
UUHHH???....OK
__________________
Dennis
04 SRT-10 - (471HP, 499TQ) Bassani Headers, JMB Catless mids, Magnaflow catback, JMB CAI and catch can, debagded JMB powdercoated EVERYTHING, 170 t-stat
2005 Dodge Magnum RT - Borla catback, K&N cold air intake
1971 Chevy C10 - Longbed, 20" Centerlines, shaved door handles, full air ride suspension, phantom billet grille, flame thrower exhaust, 383 with 2x4's on a cross ram intake
Reply With Quote
  #4 (permalink)  
Old 01-14-2007, 03:03 PM
Member
 
Join Date: Jul 2006
Location: Indianapolis
Posts: 143
Member #385
Just Google Bumpsteer and Bump Steer and you will find more info than you can read.

I also found this while doing that search:

Talk about Bump Steer!

Attached Thumbnails
1968-3909-60515.jpg  
Reply With Quote
  #5 (permalink)  
Old 01-14-2007, 03:13 PM
Silverback's Avatar
VIPER POWERED
 
Join Date: May 2006
Location: The Deep Dark Jungle
Age: 66
Posts: 16,758
Member #9
This was posted earlier.

Here you go.

A. Definition

Bump Steer is when your wheels steer themselves without input from the steering wheel. The undesirable steering is caused by bumps in the track interacting with improper length or angle of your suspension and steering linkages.

Most car builders design their cars so that the effects of bump steer are minimal. However, you must still take care to bolt on your suspension carefully so as not to create unwanted bump steer. Make sure that you are always using the correct components for a particular car. Bump steer must be designed into the car and cannot be adjusted out if improper parts are used or if pivot points are moved without considering bump steer design principles.

In order to accomplish zero bump the tie rod must fall between an imaginary line that runs from the upper ball joint through the lower ball joint and an imaginary line that runs through the upper a-arm pivot and the lower control arm pivot. In addition, the centerline of the tie rod must intersect with the instant center created by the upper a-arm and the lower control arm (See diagram below).

The instant center is an imaginary point that is created by drawing a line from the upper a-arm ball joint through the a-arm pivot where it is intersected by an imaginary line that extends from the lower ball joint through the inner control arm pivot. Where the two imaginary lines intersect is the instant center.

Sounds complicated? Really it is very simple. To achieve zero bump the front end must be designed correctly. The tie rod must travel on the same arc as the suspension when the car goes through travel. Simply matching lengths and arcs to prevent any unwanted steering of the front tires.

To exaggerate, if the tie rod were only 10" long and the suspension were 20" long then when the suspension traveled the tie rod angle would shorten much quicker than the suspension arc. In this scenario the tie rod would shorten much quicker through travel than the suspension and the car would toe in drastically over bumps. The shorter arc of the tie rod would pull on the spindle and toe it in through travel.

Bump Simplified - When designing a car, if the centerline of the outer tie rod lines up with the centerline of the lower ball joint, and the inter tie rod lines up with the lower pivot point then the length and angle of the tie rod and suspension will be the same resulting in zero bump. Most car builders design their cars in this fashion.

Here is the site if you want to read more.

http://www.racerpartswholesale.com/longtech3.htm
__________________
2005 Yellow Fever RC. #130 of 500. SOLD 1965 Superformance Cobra. 2007 Jeep SRT/8, Black
"A Proud Member of the Old Guard."
Reply With Quote
  #6 (permalink)  
Old 01-14-2007, 03:15 PM
BlackViperRam04's Avatar
Member
 
Join Date: Jan 2007
Location: Virginia Beach
Age: 36
Posts: 177
Member #1024
Thank you very much.
__________________
Dennis
04 SRT-10 - (471HP, 499TQ) Bassani Headers, JMB Catless mids, Magnaflow catback, JMB CAI and catch can, debagded JMB powdercoated EVERYTHING, 170 t-stat
2005 Dodge Magnum RT - Borla catback, K&N cold air intake
1971 Chevy C10 - Longbed, 20" Centerlines, shaved door handles, full air ride suspension, phantom billet grille, flame thrower exhaust, 383 with 2x4's on a cross ram intake
Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On






All times are GMT -4. The time now is 02:55 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
vB.Sponsors
This site is supported by its members, vendors, and administration. Vtcoa.com is in no way affiliated with Daimler Chrysler. Dodge, Viper,Ram SRT-10, the Viper logo and likeness are registered trademarks of Daimler Chrysler. The contents of this site are owned by Vtcoa.com and may not be used or reproduced without the express written permission of the Administrator.
GM Truck Forum
Ford Raptor Forums
Chevy Tahoe Forum
Chevy Cobalt Forum
Chevy Camaro Forum
Toyota FJ Cruiser Forum
Ford Truck Forum
88-98 GM Truck Forum
73-87 Gm Truck Forum
Ford Expedition Forum
Chevy Equinox Forum
Chevy Cruze Forum
Jeep Liberty Forum
Jeep Forum
Dodge Ram Forum
Chrysler 200 Forum
Scion xD Forum
Scion xB Forum
Dodge Challenger Forum
Sotball Forums
SRT Forum
Nissan Titan Forum
Buick Enclave Forum
Cadillac Forum
Cadillac XTS Forum