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I bought the kit130k from Super Pro , but just that bush was not included in the part list so i bought from powerflex
I just was eondering how good was just that one
Also Mazdatrix offers some Masdasoeed bush for the same 40% stiffer but i dont trust in rubber as much as i trust in Uretgane
Anyways will be nice to know if somebody have some experience with the rear lower inner bush ?
Super pro does not make a replacement bushing for this pillow ball.
Stock Mazda rubber insulated pillow ball is FD01-28-460 and is ~$65-75ea.
Mazda Competition piece with 40% stiffer runner insulation is F128-28-460 and is ~$100ea.
This stock "bushing" is not a bushing.
It is a steel pillow ball with some rubber insulation between it and a steel sleeve to help with transmitting vibration to the chassis.
This Mazda illustration shows a cut-away of this type of "pillow bushing" in the rear toe arms- the rear lower inner one is the same type as the "pillow bushing" shown here.
Powerflex makes PFR36-308B which is a vastly inferior product (binds) for ~$60 for the pair.
FWIW...It's been a while but from memory one of those bushings (inner or outer) had an aluminum or soft steel sleeve that was kinda tricky to press in evenly.
For the rear trailing arm, it is probably easier to just go with an aftermarket trailing 'arm' with a heim joint. Like what rx7.com has: RX7.COM | FD Suspension
Someone used to make a poly bushing for the stock trailing arm. I forget who. I remember receiving one as part of a group buy on this forum ages ago when I was experimenting with poly bushings. I didn't like the poly bushings fwiw but that is for a different thread.
I was considering something like this
See photo
But meaby for the street the bearings will not last long
So probably i will go with the mazdaspeed inner ones and all the Poly Super Pro bushings
Well depend of the street driver that you are
But i guess that less rubber means that they last longer and the are more stiff
So more predictable rear end
On a street car is there any advantages going with the mazdaspeed over OEM ?
Mazdaspeed bushings are made of 40% stiffer / harder rubber on the same design as the stock bushings. That means they deflect less which means more precise handling while still providing reasonable isolation from noise, vibration and harshness. So if you track your car, do autox or generally enjoy more feel from your suspension, you may appreciate the stiffer mazdaspeed bushings.
The stock ones work perfectly fine as well. The only difference between the two is the stiffness of the rubber. They should last about the same time since the ball joint type pillowballs thingies encased by the rubber are the same.
11-28-16, 06:21 PM
