trailing arm bushing question

[WOLVERINE]

I am wondering if anyone can tell me, as I am trying to put together a rear suspension for my iroc project, in which i will run rear coilovers with eibach springs ,thus deleting the rear torsion bars if it matters what spring plate bushings I use (i.e. poly bronze,rubber or composite) I am running poly bronze in the front with torsion bars......the car will not be raced or autox'd.
Thanks

[911st]

A soft bushing will be more comfortable, a hard bushing will reduce changes in toe and negitive camber from flex in the bushings.

[al lkosmal]

That's a good question....subscribed

[Chuck Moreland]

Do you mean trailing arms? Or spring plates?

[WOLVERINE]

Chuck,
thanks for the education.......................spring plates.

[waynesco1]

I installed and would reccomend Elephant racing MONO BALL trailing arm bushings , and ERP polybronze spring plate bushings .

[al lkosmal]

Tony is aking about the best choice for spring plate bushings, when used in combination with coil over suspension. (sometimes, when I'm helping....I make mistakes...Tony was asking me about this the other night and I inadvertantly pointed to the spring plates hanging on my garage wall and called them trailing arms which has led to this confusion, but now that this mistake has been cleared, let's talk about spring plate bushings....) I have not installed coil overs and have no experience regarding this suspension change, so my comments/questions should be taken with that in mind.
Here is my thinking: Since the torsion bars are removed and the "active" spring/suspension component has been removed from the torsion bar to the coil springs, it seems to me the spring plate has now become a pivot point/suspension locater only and should be as free to rotate as possible. so that the bushing choice should be the one that provides the most friction free, bearing like action possible. Is this the crack pipe talking or...?
Suspension gurus..please chime in. Chuck???? are you out there?

regards,

Al

[911st]

The ER PB's are a best bet practices choice .

Putting rubber bushings w coil overs would be a special situation. Kind of like adding a full race cam then pumping your tires up with more air to help gas mileage.

The rear arm pivots around the bushing at the torsion bar and the inner arm bushing.

If these are rubber the wheel will deflect more than if they are hard.

One example is, if you set the rear at zero toe at rest. With hard accel the bushings will deflect and you will get toe in. Under hard braking you will deflect and get a bit of toe out.

Same issue w camber. If you may have to add more negative camber to allow for deflection with rubber than without.

You can also go to hard bushings in the shock tops and bottoms. This will make the ride more harsh but allow you shocks to better control the wheel motions.

I am not an expert, this is just my guess.

[WOLVERINE]

This stuff is better than a college education