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[feeutfo]

interesting article, in which the builder talks of having to fit a steering rack and then sort the bump steer, can anyone explain? bump steer i mean? and its effects on both steering systems...

i guess the rack is to give space for the new lump.

http://www.evo.co.uk/carreviews/evocarreviews/210264/vauxhall_omega.html

[dispondent 1]

http://en.wikipedia.org/wiki/Bump_Steer


i still aint got a clue

[benbrunt]

http://en.wikipedia.org/wiki/Bump_Steer


i still aint got a clue

How to overcomplicate a simple subject!

I think it's trying to tell us that as the wheels move up, they move outwards

[Christian]

That looks like an animal  

[feeutfo]

http://en.wikipedia.org/wiki/Bump_Steer


i still aint got a clue

He he, yeah not sure about that, would have thought camber would be affected more than "toe in" as the suspension rises, and not necessarily both wheels at once.. Anyone?

[Kevin Wood]

Depends on the geometry of the wishbone(s) against the track rod. Both obviously deflect at their outboard ends as the suspension goes into compression.

If they don't effectively pivot at  the same length, or if they are not parallel, there is a steering input as the radius of the two arms is different as they move.

Kevin

[feeutfo]

Depends on the geometry of the wishbone(s) against the track rod. Both obviously deflect at their outboard ends as the suspension goes into compression.

If they don't effectively pivot at  the same length, or if they are not parallel, there is a steering input as the radius of the two arms is different as they move.

Kevin

So Parallelagram(spelling?) equals no bump stear?  Guess he means he had trouble positioning the wrack/control arms with that in mind. So its a geometry thing rather than a feedback issue, if you know what i mean?

With the vagueness of the omega steering, i always wondered why gm chose a steering box over a rack? Space? Not according to the Mr Rats. So is it, down to weight of the car/large wheel sizes and the rack not coping with either of those?
 I am assuming a rack is more precise than a box, due to my experience with omegas, but then having experienced omega bushes i wonder if its these that allow the road surface to pull the car about and the box is fine in theory? Whatever the reason, i am not sure i would want to put a standard omega on 48 degree banking with a 1000hp motor and max it to 230 odd mph without pin point accurate steering/car set up. So, very interested in what he did to the set up,given how relaxed he is while driveing it, is a rack a better bet than a box?

And its a fair bet his bushes aint split. Although they may well have been by the time he did a few laps of that bowl...

[dispondent 1]

Depends on the geometry of the wishbone(s) against the track rod. Both obviously deflect at their outboard ends as the suspension goes into compression.

If they don't effectively pivot at  the same length, or if they are not parallel, there is a steering input as the radius of the two arms is different as they move.

Kevin

So Parallelagram(spelling?) equals no bump stear?  Guess he means he had trouble positioning the wrack/control arms with that in mind. So its a geometry thing rather than a feedback issue, if you know what i mean?

With the vagueness of the omega steering, i always wondered why gm chose a steering box over a rack? Space? Not according to the Mr Rats. So is it, down to weight of the car/large wheel sizes and the rack not coping with either of those?
 I am assuming a rack is more precise than a box, due to my experience with omegas, but then having experienced omega bushes i wonder if its these that allow the road surface to pull the car about and the box is fine in theory? Whatever the reason, i am not sure i would want to put a standard omega on 48 degree banking with a 1000hp motor and max it to 230 odd mph without pin point accurate steering/car set up. So, very interested in what he did to the set up,given how relaxed he is while driveing it, is a rack a better bet than a box?

And its a fair bet his bushes aint split. Although they may well have been by the time he did a few laps of that bowl...

  still aint got a clue :-/  

[benbrunt]

Sure there's some shots of that Omega on youtube doing about the speed of sound! Just like the M62 :-?

[feeutfo]

Rats web site is in Norwegian unfortunately. Cant translate it with mobile browser. :-(