ndogg

The Eibach stuff can be found here: http://eibach.com/eibach/img/ers-catalog-2004.pdf

Also, you are forgetting about the motion ratio (.67 rear I believe). So with 750lb corner weight, there would be ~1100lbs on the spring.

berny2435

Thats a better catalogue than the one I found on their main site. nice find. Saved for later use.

yeah, I botched that one up. At work, tried to make a post in between tasks. yeah, I run 650s rear and they compress around 1.4"

JJ7

Assuming stock offsets right? Its even lower with lower offset wheels. My +38s are 1 full inch further out than my stock +63s. Maybe somebody better at math can tell me what my motion ratio is now. I know I run an aggressive offset but most people with suspension are running around 40-50 still.

ndogg

I shot an email to AST-USA and they recommended 6" springs for me with 550lb springs. They said the 5.5" was more for people running ~750lb rear springs.

//steve\\

Are these new ones a full threaded body?

When I had my 4100s the threads didn't go all the way down the body and with 600lb rear springs and helpers even with the perch as low as it would go the rear was around 12.75-13" ride height. It could not go any lower. I think some of the hyperco real low stack height helpers would fix the problem but I'm just curious now.

GT Motoring

From the drawings Ive seen, they are not. I'll double check though.

TWF

That depends on springs used. Just because one spring is shorter than other does not mean you will run out of travel.
For example this two springs have same rate (450#) and same travel.

macr88

I'm referring to block height not useable height.

TWF

What block height has to do with it if both give you same travel? If shock has more travel than spring either one will bottom with enough load.

cuonice

You'll want to mock a set of these up before packaging them with those spring lengths; if they are anything like the previous generation 4100/5100 you will be relegated to running a relatively short spring to obtain most users' desired ride height. In most rates used within the S2000 community, you probably won't go longer than a 6" spring all around. Really no good reason to either - I can't think of a user that needs the extra length so its just extra weight and less adjustability.

This all assumes they are similar in dimension to the previous 4100/5100.

On a semi-related note: The first set of 4100's sold stateside back in 2008 just won double National Championships with NASA in the Honda Challenge H1 and Time Trial B class. They are on 6"x700/5.5"x650 springs respectively with AST spherical top hats. Four seasons of HARD racing on those shocks and they are still turning record laps!

-Aaron