I need help about internal shim stack (high speed damping) specifications for Ohlins TTX shock. Bought an used TTX shock (KA358) for my Gen4 what I started to rebuild for racing use. My weight without gear is 190lbs (86kg). Spring that I have is 110 N/mm (21040-39), but think I start out with 115 N/mm spring (with stock linkage).
Now I pulled shock apart and suspect that I have a problem:
Shim stacks are too soft (C6 and R7 - see below). Why do I think it's too soft? Answer: have seen few spec. cards for TTX shocks what are using 80-85 N/mm springs, with one step harder shim stacks (C7, R8)! To make matters worse, the Gen4 has quite high swingarm ratio (2.39), resulting me and 115 N/mm spring to OVERPOWER shim stacks. Not optimal tyre wear and performance may happen.
Unfortunately there is very little info I can find about TTX36 shim stacks (I'm missing shimming charts like Racetech has for rider weights).
Here are my questions:
a) Does anyone have data about Ohlins TTX stack contents (Cx, Rx) and corresponding rider/spring weights?
b) What shims are inside C7, C8, C9 etc., R8, R9 etc. shim stacks? I know only C6 and C7 (see below).
c) What shims in TTX are you people having with your spring and body weight?
I found some data about Kyle 5% linkage: It has ratio of 2.15 what is ca. 11% difference compared to stock linkage. Logically Kyle link needs softer spring and ca. 11% softer shim stack too to be equal with stock linkage. Following suggests C37 and R5 stacks (weight unknown, but 110 N/mm spring) with Kyle link:
But again, what shims are inside C37 and R5???
If I would even know that, then I could simply add some 10-15% stiffness to C37, R5 shims and be roughly in ballpark.
This is a sample of Ohlins TTX36 shim stack: