In our first article of this series, I talked about the very basics of shock adjustment in general, basic shock damping technology, and how to adjust single adjustable shocks. For this article to make sense, please back up and follow this link to the first article and read it before reading this one! It probably would not hurt to read the series Ultimate Suspension Set-Up Guide as well.
Watching this video would be very helpful as well.
Most of the commonly available quality single adjustable shocks on the market have most of the adjustment on the low-speed rebound part of the rebound damping curve. Here is a graph of a typical quality single adjustable shock showing the damping force available throughout the adjustment range. In this case, the shock is a KW V2.
Now when we talk about adjusting double adjustable shocks, there is adjustable rebound damping as shown in the chart above with the addition of adjustable compression damping. Having double damping adjustment like this is a great assist giving you a tremendous ability to fine-tune your ride and to get your car to behave in the way that you want it to act.
On the other hand, having two knobs to adjust allows you to really mess things up and to adjust yourself into handling hell if you do things wrong. I will show you a technique where it is impossible to screw yourself into a corner where your car just isn’t working.
There are not too many quality shocks on the market that are double adjustable for a reasonable price point. KW and ST Suspension perhaps have the widest range of applications with an application for nearly everything. If this seems like this is a KW commercial, well this is the reason, KW or ST probably has an affordable application for your car.
Other companies that also do are Feals and Fortune Auto. Going up some in price are Ohlins, MCS, Moton, JRZ, AST, Sachs, and Penske. If no one makes an application for your car and you can fabricate, Koni has the 8611 universal application and Ohllins has a line of universal dampers and easy-to-modify housings. There are also companies like AFCO and JRi but I don’t have any experience with them.
So to make more sense of how to adjust your compression damping, please read part one on how to adjust the rebound and what it affects as well as signs off too much and too little rebound as this is going to add to it.