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50mm FastAce stack


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I thought I would post up the stack on this shock.  My goal is to try and adapt it towards off-road rocks and roots riding.  This shock does not have a separate HS comp adjuster, so I will need to go after the stack.  Shock is loosley based on the WP50mm.

I was thinking about moving the 24mm cross over to the clamp and using one of the 26mm shims as the cross over.  From what I gather from searching is that the clamp has a big effect on things.  I am also considering maybe adjusting the shims on the HS end of the stack.  There are two shims of each diameter, so maybe pull one of each size of the 32,30,28?

Comp stack:

10  16x44x.2

      16x24x.1

      16x44x.2

2    16x42x.2

2    16x40x.2

2    16x38x.2

2    16x36x.2

2    16x34x.2

2    16x32x.2

2    16x30x.2

2    16x28x.2

2    16x26x.2

 

 

 

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That's tiny ,like crazy tiny ,you will get a lot of hs damping from the port itself

I would not be surprised if the shims are doing very little honestly , so revalving won't make much difference

A showa or wp of kyb 4 port piston has pretty big ports and a similar shim stack

Can you fit another piston ?

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That's tiny ,like crazy tiny ,you will get a lot of hs damping from the port itself

I would not be surprised if the shims are doing very little honestly , so revalving won't make much difference

A showa or wp of kyb 4 port piston has pretty big ports and a similar shim stack

Can you fit another piston ?

Sorry, I switched gears on you. I was talking about the piston up in the comp adjuster assembly.
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 If they doubled up shims in the stack, there must be a lot of bleed or huge ports. Either the compression adjuster isn’t doing much or the shock piston has huge ports. Compared to a WP shock-that is very stiff. Like 2x as stiff. The linkage ratio should be same or similar to a ktm, so something is way different. To answer question-yes removing doubled shims on HS stack will soften high speed hits for rocks. I’d start with removing every other double shim. Instead of moving the crossover to clamp, I’d remove 1-2 face shims. 

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I understand wrong maybe,sorry

The 2 shims with .20 its like 1 .25 as most stock stacks have in hsc

So i think you are ok there but your stack stops early...i mean you need after the 26.20 to ADD 24.25 & 22.30 to be ok for what you need.

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Ok. If you want to mess around a bit before replacing those pistons;

You could try drilling those four holes in the main piston as big as you can, leaving 1.5mm min between the ports. If the outer edge is the limiting factor, go to .5mm thickness for sealing there. Then flip the piston so these become the rebound holes and the bigger square one's the compression.

The little piston I'd drill the comp holes to .5mm sealing lip (dunno how much bigger that is) and leave it the same way up for now.

What is the current rebound stack?

Edited by DEATH_INC.
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8 hours ago, DEATH_INC. said:

Ok. If you want to mess around a bit before replacing those pistons;

You could try drilling those four holes in the main piston as big as you can, leaving 1.5mm min between the ports. If the outer edge is the limiting factor, go to .5mm thickness for sealing there. Then flip the piston so these become the rebound holes and the bigger square one's the compression.

The little piston I'd drill the comp holes to .5mm sealing lip (dunno how much bigger that is) and leave it the same way up for now.

What is the current rebound stack?

Unless I am mistaken the comp is all ready using the big square holes. 

I do think I will try and drill the compression adjuster assembly's piston.  I can likely go from 2.5mm to 3.5mm without any issues.

Rebound stack

5   16x40x.2

     16x24x.1

      16x40x.2

2   16x38x.2

2   16x36x.2

2   16x34x.2

2   16x32x.2

2   16x30x.2

2   16x28x.2

2   16x26x.2

2   16x24x.2

Edited by chadzu
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That makes more sense,the rebound stack is soft ( due to the small ports )

The comp ports are decent on the main piston ,the kyb shock benefitted from enlarging the comp adjuster ports to 3.5mm I think

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