OK, the subject of the S2K's bump steer has been discussed adnauseum on this board, but despite doing a in-depth search I could not find any hard numbers on it.

I understand that rear bump steer (more correctly called "roll steer") on the S2K is the direct cause of the unstability of the rear end of the car, not to mention that it rhymes with snap oversteer.

Doses anyone know if rear roll steer has actually been measured and, if so, what the results are?

It would be more than interesting to know the actual change in toe setting throughout the range of travel of the suspension, as this would lead to many entertaining and educational exchanges on solutions, or if solutions are even desireable.


Pierre

 

I will know pretty soon.

But you can calculate it yourself too.

1) Take off wheel
2) Take off rear shock and disconnect sway bar
3) Put back on wheel
4) Find a point to measure from on the wheel outside front edge of the wheel and to the car or a fixed pole or even the wall of your garage.
5) Use a jack to move the rear wheel thru its range of motion and measure the change in toe at each step.

-Ry

 

This experiment has already been done - I believe Jason Saini went through the process and posted the results here, though it was some time ago. As I remember it the results were somewhat high, but not unreasonably so.

What makes a car "lively" or "nimble" in the opinion of one makes it "unstable" in the opinion of another.

Reduced rear toe change through the suspension's travel is touted as one of the changes in '04 S2000s.

Wonder if the whole subframes are swappable - any idea there Ry?

 

Wouldn't that be interesting...whole new suspension geometry as a bolt in CB mod

 

I've yet to see an 04, but I don't see why they can't be. The come out quite easilly.

But (AFAIK) if you really want to change the geometry, you reaaly want to move the position of the control arm when it connects to the knuckle not the subframe.

So I would bet that its likely that the change in the 04's is at the knuckle not the subframe.

 

When Jason said subframe, I was thinking of the whole thing including arms and the like.

 

http://www.hondaautomotiveparts.com/auto/j...gry5=CROSS+BEAM

#6 is is the subframe. But you could of course replace the whole thing a-arms & knuckles included. It would be pricey tho.

Its kinda neat tho, now that I've taken it out, you can drop our our whole rear suspension, diff subframe. In about 15 minutes. It all comes out in 1 piece. Just gotta move a couple minor things out of the way and disconnect the brake lines & drive shaft.

 

I'm new to the board and I too would be very interested in knowing the results. This could possibly explain why my rear end ('01) is all over the place, even if I only drive it moderately agressively on the street.

Guy

 

[QUOTE]Originally posted by Wildass
I'm new to the board and I too would be very interested in knowing the results. This could possibly explain why my

 

I have The UK alignment specs I have found on this board, and run pressures of 34F and 32R. On many street corners that I take with a little ghosto the rear seems to step out a few inches, but this doses not get dramatic if I keep the gas on. However, this is definitely not normal and diminishes my enjoyment of the car. This could easily get out of hand!

Guy