S2000 STR prep resource
Joined: Mar 2002
Posts: 588
Likes: 7
From: Bellingham
Originally Posted by TheNick,Feb 9 2010, 01:06 PM
Do yourself a favor and do two step shim stacks. One shim stack for low speed - then a spacer - then your smaller stack for mid-high speed damping. DO NOT USE ANY PRELOAD. Try it out and see what happens.
You don't need a whole lot of rebound, but I would try the double digressive piston if I were you - you need SOME low speed rebound and right now you don't have any at all with the linear rebound. When you added more rear rebound - you added a ton of high speed damping that will cause the inside tire to skip over the surface. This can cause some goofy handling characteristics.
Your rebound adjuster only touches the bleed through a jet in the shaft. You can replace the jet to get different low speed characteristics as well. I don't think you can mess with the 8100 canister much - you'll just need to put thicker shims on the compression side.
You don't need a whole lot of rebound, but I would try the double digressive piston if I were you - you need SOME low speed rebound and right now you don't have any at all with the linear rebound. When you added more rear rebound - you added a ton of high speed damping that will cause the inside tire to skip over the surface. This can cause some goofy handling characteristics.
Your rebound adjuster only touches the bleed through a jet in the shaft. You can replace the jet to get different low speed characteristics as well. I don't think you can mess with the 8100 canister much - you'll just need to put thicker shims on the compression side.
What about using a preloaded stack on the rebound side to get some digressive behavior?
Registered User
Joined: Jun 2008
Posts: 1,024
Likes: 1
Bottom of Page 45:
Works for Moton - why wouldn't it work for Penske too?
They then use multiple levels of shim stacks with spacers and very low preload. They use thicker shims to get the high speed damping, instead of preloading thinner shims. The shims have a progressive spring rate, if you preload them - they lose the initial soft spring rate and go straight to the harsher rate. When you blow off at the knee of the curve, the shims snap open very quickly. By using thicker shims and low preload - the initial soft spring rate is still preserved and the transition is much smoother.
Joined: Nov 2003
Posts: 2,246
Likes: 1
From: Atlanta
I think Nicks comment about preloading may have to due with the nature of steel spring and how it behaves when preloaded. Something about having an abrupt operation when preloaded which will cause pressure drops on the back side of the valve and erratic behavior on the edge of it's operating realm.
In other words, it will cause a funky transition between high and low speed.
In other words, it will cause a funky transition between high and low speed.
Registered User
Joined: Sep 2004
Posts: 380
Likes: 0
From: Austin, TX
Originally Posted by TheNick,Feb 10 2010, 11:01 AM
Anyone else see something wrong with the upper mount on the shocks or is it just me?
I can't find any pics of mine with the adapter installed on them. The 2nd pic you posted looks more normal to me, maybe it's the scale of the first pic.