Bilstein Sport with Coilover question

[Philo]

True, you'd be paying an extra $900 for dampers; but as you said, there is no substitute for serious dampers. ;)

[Wh33lhop]

Lulz. I like this discussion guys. :up:

I run H&R race, and have no problem with my Bilsteins. Also, OP, you can get the AST 4100 set-up for very close to the GC set-up and it will be WELL worth the money.

Yeah, without springs, camber plates/rear mounts, etc. AST 4100s will run you $2500+ when all is said and done.

That said, there is no substitute for serious dampers.

[Philo]

Lulz. I like this discussion guys. :up:

I run H&R race, and have no problem with my Bilsteins. Also, OP, you can get the AST 4100 set-up for very close to the GC set-up and it will be WELL worth the money.

[njansenv]

Ok, THAT's pretty embarrassing....

[FredK]

I was wondering what njansenv was trying to get at... haha.

[Hellabad]

Just a quick correction regarding wheel rates vs. spring rates:
Wheel rate = spring rate x motion ratio SQUARED. The motion ratio affects force AND distance travelled.

If the MR = .5
Then: 500 pounds spring force = 250 at the wheel.
Moving the wheel 1" results in 1/2" of spring compression.You forgot to square the motion ratio.

Nathan

You forgot to square the motion ratio.

If the "motion ratio" is 0.500, then a 500 pound spring on the arm is 125 at the wheel.

But the spring still only moves 1/2 inch.

A minor point, but an important one! (and a mildly frustrating common mistake often seen by this suspension eng!)

Nathan

Yes. Very Very frustrating (thats very^2)


Jay



OK, Actually, by definition the motion ratio has already been squared. But what was squared? There is no consistent name for the ratio that is squared to get the "Motion Ratio", so I call it the leverage ratio. The distance from the spring to the pivot, and from the center of the tire (on a swingarm car) to the the pivot.

e30 content: The Motion ratio, after squaring, for an e30 is in the low 0.400's

[njansenv]

Just a quick correction regarding wheel rates vs. spring rates:
Wheel rate = spring rate x motion ratio SQUARED. The motion ratio affects force AND distance travelled.

If the MR = .5
Then: 500 pounds spring force = 250 at the wheel.
Moving the wheel 1" results in 1/2" of spring compression.

A minor point, but an important one! (and a mildly frustrating common mistake often seen by this suspension eng!)

Nathan

[Stephen]

Nice, good to know

[Colorlesss]

Lol. Well thats good to hear. You didnt bounce in the rear?

blew out the boge's the first trip up my street. new bilsteins were in for a little over a month and a half with no issues at all. no bounce. all of it will be going back on my new DD. rears are still perfect.

[Stephen]

^Just the buy the custom valved Koni's and move on with your life.

Sadly, not in the cards right now. Plus i payed for the billys and would rather deal with warranty if theyre busted or go softer in the rear if necessary. I put the spring pads back in, calmed it down a hair

500 will be ok. i DD'd a slammed e with 500/700 rates on bilsteins and it was very solid.not revalved or modified in any way. tires never met my fenders except a few times on full turns with buddys in the car


couldnt fit your fingers in there

sportmaxx .. oh god

Lol. Well thats good to hear. You didnt bounce in the rear?

[Colorlesss]

what size tires you running?

195/50

[fmxomar]

what size tires you running?

[Colorlesss]

500 will be ok. i DD'd a slammed e with 500/700 rates on bilsteins and it was very solid.not revalved or modified in any way. tires never met my fenders except a few times on full turns with buddys in the car


couldnt fit your fingers in there

sportmaxx .. oh god

[z31maniac]

^Just the buy the custom valved Koni's and move on with your life.

[Stephen]

jay, can i call you about my billys? it seems like 500 should be ok with billys, not bounce like crazy