Solid rear subframe bushings

[3KGTCRUISER]

Nice! If anybody has these installed on a autocross/road course car please post up if you noticed some handling benefit. I was actually thinking of making these myself. Smaller slip angles = good.

Matt-would you sell just the fronts of the rear subframe by any chance? I think just adding a front set would really help the car oversteer.

Also, how bad has cabin vibration increased with these installed?

[SnakeSkinner]

Originally Posted by 3KGTCRUISER

Matt-would you sell just the fronts of the rear subframe by any chance? I think just adding a front set would really help the car oversteer.

Also, how bad has cabin vibration increased with these installed?

I have not made any front ones yet. I welded my fronts solid quite a wile ago. But making a nice set of front solid bushings is on my "to do" list.

[dropdatscort]

ok quick question on the bushings. why dont you make the upper mounting point flat on the front upper bushings instead of having the 1/4 stick up that could crush?

i was looking at that design and the front uppers kinda seem a little unsafe since t-6061 would be weaker than steel in that area.

[10CentGT]

I have crazy wheel hop in front, I wish you had these for the front.

[SnakeSkinner]

Originally Posted by dropdatscort

ok quick question on the bushings. why dont you make the upper mounting point flat on the front upper bushings instead of having the 1/4 stick up that could crush?

i was looking at that design and the front uppers kinda seem a little unsafe since t-6061 would be weaker than steel in that area.

6060T6 is alot stronger then you think, cars like Corvettes use Cast aluminum for nearly all of there suspension components that's is ALOT weaker then 6061. It's holding up fine in a 1000+hp 8 second car, and it fore sure stronger then the rubber it replaces.

[wraith]

Matt,

With these bushings, you re-use the rubber ring to keep vibrations from passing? This has to make a noticeable difference from the stock jello bushing.

[cbehnken]

Originally Posted by wraith

Matt,

With these bushings, you re-use the rubber ring to keep vibrations from passing? This has to make a noticeable difference from the stock jello bushing.

even if he does the center part of the bushing will contact the upper washer and that will contact the frame directly.

As far as I can tell all the rubber ring does is keep dirt out.

[wraith]

Originally Posted by cbehnken

even if he does the center part of the bushing will contact the upper washer and that will contact the frame directly.

As far as I can tell all the rubber ring does is keep dirt out.

Thats true but having a ring of rubber has the abilty to dampen because certain frequencies are absorbed by the different material in contact. Its like putting your hand on a noisy box fan and changing the pitch of the sound

[cbehnken]

Originally Posted by wraith

Thats true but having a ring of rubber has the abilty to dampen because certain frequencies are absorbed by the different material in contact. Its like putting your hand on a noisy box fan and changing the pitch of the sound

what contact? The center bushing part directly touches metal, the rubber part goes around it. I must not be understanding what you are talking about.

[wraith]

Originally Posted by cbehnken

what contact? The center bushing part directly touches metal, the rubber part goes around it. I must not be understanding what you are talking about.

your saying on your car, you can take that rubber puck and spin it around without it being squashed between the car and subframe? What I am saying is that NVH as transmitted into the floor thru attached connections can be quelled by the simple contact of two materials. You know, like spraying rubber on a metal panel. The whole metal bushing comes to a small nub which is in direct contact with the upper frame mounting point, but its surrounded by a thick rubber washer which has inherent frequency damping properties. Its like a continuous copper pipe which vibrates when water throttles thru it. If you wrap the pipe, its not the thickness of the material wrap that blocks sound, its the ability of a material in contact with another to alter the natural frequency in it that normally lets it produce a standing wave. Its physics, but I am just a EE, and its been over a decade since I wa a Freshman.