Bilstein Sport with Coilover question

[Stephen]

Well this thread proves it for me. My rear end bounces with 500# springs, and my shock mounts are fine, as well as poly sub frame and TA bushings. I guess i need to give bilstein a call.

[z31maniac]

Your shocks may be blown. Bilsteins run with H&R Race springs at 570 in the rear. Or are you so low you are hitting the bump stops perhaps?

[Jean]

KONI / end thread.

[Stephen]

Your shocks may be blown. Bilsteins run with H&R Race springs at 570 in the rear. Or are you so low you are hitting the bump stops perhaps?

I think theyre blown. 500isnt too stiff, and im running the 6inn springs that used to be yours. so, low but not slammed. Hopefully billy will replace them

[RalleyTuned]

rebuild/re valve on bilsteins is only $75 each

rebuild/valve on koni's is like $185ish each, not to mention they cost 2x as much as bilsteins and in my experiance with them on vw's in the past years, don't last nearly as long

cant ever go wrong with bilsteins :D haha

[DRTSRFR]

Keep in mind, the rear spring rate is totally different than the actual wheel rate.

With a 500 lb spring the actual rear wheel rate is about 230.

[E30_fiend]

Keep in mind, the rear spring rate is totally different than the actual wheel rate.

With a 500 lb spring the actual rear wheel rate is about 230.

^^^^^
explain this

[884door]

^^^^^
explain this

The wheel is very far from the spring, and the trailing arm acts as a lever.

[E30_fiend]

I understand that. what I meant is where he got that number from

[JGood]

I understand that. what I meant is where he got that number from

It's leverage. The rear suspension wheel ratio is .45, so 500 x .45 = 225

http://www.e30m3project.com/e30m3performance/tech_articles/susp-tech/eff_rate/eff_rate.htm

[z31maniac]

Good to know, I had been thinking the motion ratio was higher than that.

750 x .45 = 337.5 in the back
550 x .88 = 484 in the front

Interesting.

[DRTSRFR]

Thanks for doin' all the work for me!:)

[2002maniac]

any suggestions where i can get them done "cheap"?

Bilstein USA

[JRKOUPE]

wheel rate

Keep in mind, the rear spring rate is totally different than the actual wheel rate.

With a 500 lb spring the actual rear wheel rate is about 230.

why mention this......?



Was any1 discussing wheel rate?...or were you just expounding?

[DRTSRFR]

I was referring to the question in the original post.

What is the the maximum rate I can run on a bilstein before it needs to be revalved, or do I even need to worry about this?

...and didn't see where anyone had considered it when discussing the rear of the car.