I'd really like to have an adjustable rear bar to go with my adjustable front bar from tripoint. I got the Racing Beat bar for the rear but the outer most adjustment hole is closer to the shock than stock and due to my wider coilovers I can't attach the end links. So I'm fed up and looking for a different adjustable rear bar. I only know of one, the Mazdaspeed. Are there others? Here is what I found so far.

stock hollow rears, not adjustable
17.3 mm 93 only
13.8 mm 94-95

RB 19mm hollow, 2 adj
Mazdaspeed 17.5mm solid, 2 adj

cusco 18 ?
tanabe 20 ?
PFS?
Eibach, adj hollow rear ?
Suspension Techniques 19mm?

Any help to fill in the gaps would be appreciated! Also the length of the "arm" is important as the RB is too long at 6.75". I already know MS is shorter and will work but finding one may be an issue.

 

Suspension Techniques is adjustable but is solid. I believe this will be too stiff for the rear.

 

I found this site to calculate bar stiffness: http://www.fromsteve.net/tech/Sway-Bar-Rate-Calculator

Here are some numbers:

93 stock assuming 2.5mm wall thickness:
300 lb/in

RB assuming a 4mm wall thickness:
535/390 lb/in

Cusco solid
485 lb/in

MS solid
525/375 lb/in

I did my best to measure the wall thicknesses but it isn't easy without cutting the bar open. I have been looking for a bar to replace my RB bar for a while. The Eibach bar is adjustable but I don't know what the bar thickness is. Fritz has one for sale but never responded to me so I bought a MS one. I believe I can use the less stiff hole on the MS bar because the ends are a bit shorter. I'd still be interested in the diameter of the Eibach bar if anybody knows.

 

I had a RB rear for a while, with the Tri-point front, and ended up going back to the stock '93 rear bar, and liked it better.

Why do you want / need an adjustable rear bar? IMO, sway bars are a fine tuning tool to finesse the front to rear balance of oversteer and understeer. Adjusting only one end (the TriPoint front bar is great!) simplifies the balancing 'act', and seems quite adequate.

 

Its a balancing act. If I go back to the stock rear I'd have to soften up the front. If I stick with the RB I'd have to stiffen up the front. I think the more I can adjust the better.

 

I think his point, which you have just demonstrated, is that you can do all the adjusting from the front.



Someone can correct me if I'm wrong, but I'm almost positive that 93's already have a beefier rear swaybar than other FDs from the factory. It was one of the things that got changed because the early cars were getting too tailhappy.
A lot of guys with newer FDs run a '93 swaybar and an aftermarket front.

TONS of info here:
https://www.rx7club.com/suspension-wheels-tires-brakes-20/aftermarket-thicker-sway-bars-really-worthwhile-street-car-535098/

 

Yea, I get it. I just want an overall stiffer setup than stock but softer than what RB offers. Maybe I'm just picky.

 

Charles,
The PFS is hollow and adjustable, I have them (F/R) on my car, but I don't have measurements on it.

 

Thanks Peter - If I had known that I might have tried to find one. I don't think Ray offers them new any more though. Oh well, the MS one is nice and should make me happy.