bump steer kit does it work?

[a1rak]

Have followed the bump steer thread with interest. Some of you guys must have fitted it by now. Does it work and make a difference on the cars. Would be nice to have confirmation from a few customers that it works.

[Brummmie]

Much happier down B roads thanks!

[dirty boy]

Any more reports guys?

[450Nick]

What exactly is this bump steer thing all about? Is it just Cerbs that are affected by it, or is it a general worthwhile handling modification?

[Steve_T]

Think about what happens as the suspension moves through its range of motion, does the wheel naturally toe in or out - i.e. because of the geometry of the steering. If it does, that's bump steer.

Edited by Steve_T on Monday 19th April 11:59

[fatjon]

http://www.youtube.com/watch?v=gKJAukSZRT0

bump steer in action.

What you are trying to do is get the steering rods running parallel with the wishbones, that way there is no rotational force on the hubs as the suspension articulates through its travel. This is quite often a difficult practical problem as it means the steering rack has to be quite high in the chassis, usually right where an engine and gearbox wants to be. A partial solution is to adjust the height of the track rod ends where they attach to the hubs by use of spacers but correct rack positioning is better. The Cerbera is actually quite good but a bit of shimming can get it near perfect by raising the rack a few mm. TBH I have never really noticed any bump steer in mine to speak of.

Jon

[450Nick]

Sorry I understand what bump steer is, I was just wondering if the kit was being made because the Cerbera suffered particularly badly or if it was just a general upgrade. I've never heard of Cerbs bump steering particularly badly so I was just curious. I've got a similar thing on my race Tuscan where the rack has been spaced forward to bring the steering arms parallel with the wishbones. I've not driven it yet though so no idea how it will handle!

[ridds]

Mine seems improved, I certainly don't feel the thing diving off the road as it used to before I fitted the kit.

[Mr Fix It]

I have seen such kits for subarus before. They are sometimes fitted so that the suspension has more adjustment than the stock set up. Its sometimes used/needed(?) after lowering the car (lowering springs, changing shocks), when that part of the arm needs to be adjusted to suit the drop.

[Gazzab]

My cerb is a late one and doesnt need the kit as it has some TVR provided steering stuff that is effectively akin to a T350 etc So not all Cerbs 'need' it. I know one or two people have had a Raceproved kit fitted as well as the guys that bought the Brummie kit. Raceproveds kit takes a different engineering solution to the problem.

[Basil Brush]

I've used the kit on an early Tuscan, along with a slightly wider rack from a later Tuscan. My car is running lower than standard. It's let me get the steering arms properly lined up with the lower wishbones.

It's a big improvement on the stock set up, but the early Tuscans were never really renowned for their confidence inspiring handling.

What approach have Raceproved taken?

Edited by Basil Brush on Monday 19th April 19:58

[Gazzab]

I only had a brief chat to raceproved shortly before brummie first mentioned his kit. Afaik it is some spacer and a rack/column extension stuff.