Xride

What is the exact difference in these shocks?

will the HD give a better handling with the SLP shocks?
will the SLP's give better but not as harsh with the stock springs?



I dont get it?

Bud M

SLP Bilsteins have different valving. Less compression, more rebound to work with higher spring rates. I found it at http://www.angelfire.com/my/fastcar/suspension.html

Xride

link doesnt work.


I thought the the HD's would work better for higher rate springs but give a bit harsher ride then the SLP's?

Bud M

Hmm, link works for me. Anyway it says valving is:

Model/Location Bump Rebound
Bilstein HD Front 159 279
Bilstein HD Rear 86 174
SLP/Bilstein Front 130 397

_

Xride

hmm still doesnt work for me???? odd.


I'm all confused on what the bump and rebound are now.

I thought higher bump for for faster spring rates?



whats the rating for hte stock shocks?

Bud M

As far as I can tell it works like this. The smaller the number, the bigger the orifice the shock oil passes through.
With a stiffer spring, you use less compression (bump) damping because the stiffer spring provides more resistance to the bump. On rebound, you use more damping to control the rate that the spring springs back.
You can't compare other brands of shocks with these numbers unless they use valves with the same number values as Bilsteins which is unlikely.
Someone with shock valving experience like Sam Strano could give a much more detailed explanation.

LT4Firehawk

The SLP Bilsteins have less compression damping than regular Bilstein HDS, and about 25% more rebound damping. This provides a better ride (less compression) with better performance (more rebound). They used higher rebound to match the greater spring rate of the SLP springs. The system really does work well, and is an excellent compromise for a street/track (roadcourse) car that sees a lot of street use, or has to live with really rough streets. I've actually tried Koni DAs on the front of my car, and the handling is about the same as 2-3 sweeps from full soft (10-12 sweeps total adjustment) on the rebound. The problem I had with the Konis, was that after adding GlobalWest upper front A Arms (with Delalum bushings) there was too much compression even on the softest setting (same as compression on Koni SAs) and the car was skating over bumps on the street. Going back to the SLP Bilsteins actually made my car handle better in this case.

Anyway, if you have stock springs either the regular or SLP Bilsteins will work fine and give a nice handling improvement.