Re: Very interesting post. Thank you.

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Re: Very interesting post. Thank you. Posted by 2Slow (more from 2Slow) on Tue, 13 Nov 2001 15:56:01

In Reply to: Very interesting post. Thank you., BillJ, Tue, 13 Nov 2001 15:24:05 Members do not see ads below this line. - Help Keep This Site Online - Signup

Bushing deflection under acceleration or braking that results in a steer effect is a bad thing. This is one of the mechanisms of so called "torque steer". (Which I define as any uncommanded steer output caused by engine torque input)

Unfrtunately if you are not careful in your bushing tuning you will get steer effects due to torque. There are a few ways of getting around this. One is to simply remove as much compliance from the suspension as possible. This works well for engine torque and brake induced compliant effects, but also removes any compliance due to lateral force.

The compliance can cause a multitude of effects, the primary one being steer. (There is also lateral force camber change as well as engine / brake torque induced camber change)

The tough job that we suspension engineers deal with is to minimize "bad" compliant effects while maintaining the good compliant effects. (Good for both handling and ride) This is not easily done with bushings that have the same rate in all directions. Voids and rate plates are used to allow bushings to have largely different raets when loaded in various directions.

The problem with stiff aftermarket bushings is that although they reduce the "bad" compliances, they also reduce the "good" ones.

The result is almost always poor ride, and handling is a crapshoot. Some aspects may improve while some may degrade. The beauty of a bushing with multiple rates in different directions is that you can decouple different events and improve both ride and handling...

-Joe

posted by 198.208.6....

Posts in this Thread:

On Bushings and deflection..., 2Slow, Tue, 13 Nov 2001 14:43:14
- GREAT DIALOGUE. Thanks to all. n/m, Stealthbomber, Wed, 14 Nov 2001 19:32:18
  - I agree!!! Very informative. (n/m), IrieTom , Thu, 15 Nov 2001 09:25:03
- it's obvious you know nothing about saabs..., chrisx, Tue, 13 Nov 2001 21:52:40
- Re: On Bushings and deflection..., Dean, Tue, 13 Nov 2001 17:10:24
  - Some experience..., Schu, Tue, 13 Nov 2001 21:02:38
    - Re: Some experience..., 2Slow, Wed, 14 Nov 2001 09:27:03
      - Sorry. Just adding an interesting tidbit of info., Schu, Wed, 14 Nov 2001 12:03:06
        Re: Sorry. Just adding an interesting tidbit of info., 2Slow, Wed, 14 Nov 2001 13:27:25
    - Some more experience..., George D, Tue, 13 Nov 2001 21:30:34
  - My understanding is ..., BillJ, Tue, 13 Nov 2001 20:24:08
- riddle me this ..., Kevin K , Tue, 13 Nov 2001 17:05:25
  - Re: riddle me this ..., 2Slow, Wed, 14 Nov 2001 10:08:49
    - Re: riddle me this ..., 2Slow, Wed, 14 Nov 2001 10:37:40
      - C900 camber, Kevin K , Wed, 14 Nov 2001 11:19:09
        Re: C900 camber, 2Slow, Wed, 14 Nov 2001 14:02:32
  - Re: riddle me this ..., 2Slow, Wed, 14 Nov 2001 10:08:49
- Very interesting post. Thank you., BillJ, Tue, 13 Nov 2001 15:24:05
  - Re: Very interesting post. Thank you., 2Slow, Tue, 13 Nov 2001 15:56:01 <-- Viewing This Message
  - Re: Very interesting post. Thank you., lms, Tue, 13 Nov 2001 15:40:19
    - Re: Very interesting post. Thank you., 2Slow, Tue, 13 Nov 2001 16:28:55
      - That's is why i said almost., lms, Tue, 13 Nov 2001 17:05:45
        -1.3 on my spg, dave n, Tue, 13 Nov 2001 21:02:32
        Wow, what a post. Now, lets talk tires and slip angles, lms, Wed, 14 Nov 2001 16:12:36
        there is no slip with my bridgestones! Q for 2slow, dave n, Thu, 15 Nov 2001 23:01:56
        Re: Wow, what a post. Now, lets talk tires and slip angles, 2Slow, Thu, 15 Nov 2001 09:55:46

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