So, I've been messing with the tuning of my Slash for about a month now. I've tuned the suspension geometry to the point where it sticks like glue to the track I race/bash on, but is still a rocket in the straights.
The problem I keep running into is suspension give. I'm more or less shooting in the dark in this area, since I know nothing about oil viscosities/flow rate. The whoops and jumps on this track are still causing me problems in that I either don't have enough dampening, or it's rebounding too quickly, throwing the tires out of the dirt.
Shocks set up like so:
50wt/650cSt fluid w/ 2-hole piston head
Pink-dot springs (+10%)
40wt/500cSt fluid w/ 2-hole piston head
Blue-dot springs (+20%)
I know the springs are part of what's causing the bounce-out, but without them the truck bottoms out and transfers a lot of it's forward momentum right into the dirt. If I go to a softer spring, the dampening force of the shocks isn't cutting it.
I'd like to experiment with different shock fluids, but I'm frankly a little confused about cSt and such. Does the cSt number follow a linear progression? That is to say, does a 400cSt fluid flow twice as fast as an 800cSt, and half as fast as a 200cSt?
I don't need exact flow rates, just a general idea of how the cSt numbers break down. Given that the piston heads on the shocks are 1, 2, or 3 hole, I can calculate the differing flow rates based on a comparison of cSt values, but only if the numbers are linear. If they bell curve, or worse yet run exponentially, this is all moot.
Thanks in advance, and sorry if this is a little heavier-duty type tuning question that usual.