I'm having a bit of trouble figuring out which side of the digressive piston bilstein used for rebound or compression. This is for the COB piston. Did they have the one way valve on rebound or compression? My guess is the compression side.

I'm using the linear pistons and know what side is what on that one but the digressive can be used in either direction depending on where you want the bleed to be.

Thanks
Mac

 

Sorry to bring this back...I called Bilstein today inquiring about the DA shaft. The person I talked to at Bilstein east (can't remember his name) said there might be a pin-top version of the shaft available, but could not remember. He told me look up the MDS shock on the German motorsport site. I found the Nissan GTR version of the MDS shock with a "pin-top".

http://motorsport.bilstein.de/Damper-pictu...489.0.html?&L=1

Just curious, would this version of the shaft work?

 

^ not sure how long it is and how long the upper section is, we don't have a ton of room above the shock top mount to the hood, but I guess it depends what top mount you're using.
I couldn't find dimensions on that shaft.

 

I don't consider "it's proprietary" as help.
They wouldn't help with anything, oil capacity, nitrogen charge, nothing at all.

I did finally revalve a rear shock but it might have a bit too much low/high speed compression I'm very happy that it's not as far off as I thought it would be for a first try.

 

I send the Motorsport Damper group an email asking about the interchangeability of the GTR-style double adjustable shaft - stroke lengths available, piston compatibility, shaft diameter, approximate price of shaft assembly, etc. I'll post the response, if I get one.

 

Any word yet ^

Here's an awesome deal that was posted by S2KN05
Bilstein PSS for ~$753. use coupon code BIGSALE. valid til 10/31
http://www.usautoparts.net/catalog/?N=0&ut...n+s2000&x=0&y=0

Would be a cheap way to get into valving these things yourself.

 

I received a generic response stating that Bilstein does not currently offer an MDS kit for the S2000 application. I replied, asking for the GTR MDS information in a more direct manner. Basically, I just want them to say whether the GTR dampers use the 46mm pistons and what diameter shafts they use. If the shaft OD is 14mm, the standard seal assemblies should work fine. Usable shaft stroke would be the next concern.

I talked with the damper builder that is currently working on my dampers about this option and we got back on the subject of using Ohlins shafts in the Bilstein bodies. The Ohlins shafts have a 16mm OD, which would require using the Ohlins seal assembly. I'm not sure if the Ohlins seal assembly would be compatible with the Bilstein cir-clip, but that should be a relatively easy one to answer. The problem with this plan is the total cost of switching to the Ohlins piston & shaft assembly. The total cost would be more than double the cost of the original PSS kit. Obviously, this is not a good route considering you'd still have to build an adjusting mechanism that is compatible with a pin-mount fitment. It was, however, mentioned in this conversation that it may be possible to use Ohlins shafts with Bilstein piston/shim assemblies because he had looked at doing the opposite - Bilstein shafts and Ohlins pistons. IF (and that's a big "if") this is the case, the total cost of switching to the Ohlins shafts would be somewhere around $1k, assuming you could build the new upper mounts and adjusting mechanisms for very cheap, e.g., on your own and with material you already have.

For now, I'm just going to use my Bilsteins "as is" after they're done being modified in order to have a decent understanding of my baseline. I should be getting them back late this week or early next week with dyno plots for each damper and each compression setting.

 

Damn, that's pricey for the Ohlins pistons & shafts.
I should be able to dyno mine shortly so I'll post up the dyno of my first revalve.

 

If you can wait a month I'm pretty sure the same website will send out a Black Friday coupon for 20% off.

Makes them cost just over $700. That's how I bought my first set.

 

Does anyone know how much clearance there is front the top of the stock top hat to the hood? I'm not interested in the distance from the damper threads or nut...but from the upper top hat bushing to the hood.

Is there 6cm (~2 3/8") of clearance to work with? Could the hood be clearanced a bit, if there is not enough space?

My stock top hats have been altered, so I can't take a valid measurement of this.