Thread: Rear Control Arms

You didn't have any bind in the rear suspension with those poly bushings?

with the ingals the metal insert is slightly larger than the bushing so the surrounding metal does not pinch the poly. i tq them down with the car at ride hight loaded with the cars weight there is no bind that i can tell.

You know, the rear bind with poly I never noticed and I always had ES inserts. I used moly lube on them when slipping them into the spindle and chassis brackets and never had a problem.

Brent

That does prevent the bushing spring rate from being added to the coil spring rate (which is nice in itself!) but it doesn't have anything to do with the actual bind in the suspension if you want to get technical about it.

The rear bind isn't a matter of lubrication, it's simple geometry, and there is bind in the stock arrangement. In order for the suspension to work, there needs to be compliance in the bushings, and the ES bushings reduce that compliance.

If you're running a fairly small range of suspension travel, or not driving at 10/10ths, then you may never have an issue with the bind. However, the greater the suspension travel, the greater the compliance needed in the bushings, and the more (negative) effect the ES bushings will have.

Essentially they end up making the rear behave like it's got a very nonlinear spring rate by resisting travel at a increasing rate as your wheel moves further to compression or droop travel.

Ben did a great writeup on the issue, I'd post the link but I have to get back to work.

Anyone have the link to that? I'd be interested to see it as the rear is the only place I dont have ES bushings and would like to see what my options are since the P10 shares the same rear suspension as the B13 (at least a very similar rendition to it from visual inspection).

Sub'd for updates.

Here's Ben's post with illustrating diagrams: http://www.sr20-forum.com/107103-post14.html

I talk about it also here: http://www.sr20-forum.com/autocross-rallycross/40630-b13-rally-car-build-2.html#post579890