I just switched from poly bushing non-adjustable UPR uppers/lowers to adjustable spherical bushing UPR's. I've only driven it once since the swap and now it's apart for some interior work, but I only noticed a slight bit of noise. A little bit of creaking on rough roads but not enough to bother me. I actually tore the poly bushings in half after some track launches and decided to upgrade to the solids so I don't have to worry about that anymore. Make sure your tq. boxes are welded and reinforced with the solid bushings as they can be quite a bit rougher on them.

 

That helps to know that the noise isn't too bad, I don't mind a little noise just don't want it to ruin the car as my daily driver.

Still curious about the actual gains of performance difference between the two

 

Spherical/solids here. Noise not too bad. My buddy trashed his passenger rear shock at the track secondary to his poly bushings breaking.

 

I've been going 1.4x 60' with poly's for 5 years and street driving, I don't know how you guys are breaking them... I'm switching to sphericals though because my car see's alot more track than street. If you truely DD the car i would leave the poly in there. The rain grime and everything will tear up the sphericals faster. And the difference they make will depend on the power level and how efficient the suspension is to begin with.

 

It's not hard to tear a poly bushing especially with a stick car that hits the tires pretty hard. Throw in tons of daily driven miles in different weather conditions and eventually the poly bushings start to wear and eventually tear. They are easy to replace and cheap, but I just decided to upgrade to the sphericals to prevent having to do that. My poly bushings were over 5 years old when I tore them though so it's not like I was tearing apart brand new bushings or anything.

 

Thanks for the info guys...

The car is my current dd and will be for the next couple years atleast.

I have poly bushings in my solid rears and looking to switch to adj so I figured that's the best time to switch bushings.

As far as car power for racing looking anywhere between mid 10s to low 11s in the 1/4

 

I guess it's a crap shoot then...me personally i wouldn't switch to sphericals untill you are ready to not DD but make it a weekend cruiser and track car. THen i would upgrade suspension ti what you really want, and know you won't be tearring it up driving it everyday. New poly bushings are cheaper than bearing ends and spherical bushings.

 

That's what I'm worried about, I know the sphericals will be best for drag racing but don't want it to kill my dd.

Someone else I talked to recommended going spherical now and if they get worn out daily driving that the heilm joints can be replaced inexpensively when that needs to be done.

Any thoughts on that?

 

Being a stick car i had to go with sperical.With slicks,I could split the polys(any brand) withno problem.A footbrake automatic I believe there would be no problem with polys.

 

Yeah car is a 6speed and will be running slicks after I use up my drag radials.

Cocomojak what 60s do you pull?

 

Can't speak for the difference between poly and solid, but can give input on rubber to solid.

My coupe had solids on the lowers and solid on the chassis side of the uppers, however it had factory style rubber bushings in the 9" moser housing. I noticed the car had a shake on the top end of the track when I sprayed it and was hitting 117-118 mph in the 1/8. It was almost a wobble and my buddies could actually see it from the starting line and mentioned it to me. On motor passes only going 106 or so I didn't notice it, but spraying an additional 175 to it put more stress on those parts.

I made the change to solid bushings in the housing and no more shake/wobble, but the car also hooks better and more consistent!

 

The noise isn't bad, and I've been street driving on the UPR Pro Series upper and lower control arms for three years. The car picked up two tenths in the sixty foot over my poly arms.

 

Sounds good to me

 

All solid here with a solid ARB...Noisey and firm ride when not on smooth surfaces but when you put the power to it! Staright as an arrow and very solid feeling well worth it IMHO.

 

+1, and nice avatar.