I just installed these emulators, and while I have not driven it yet just the feel of the forks afterward is WAY different. they are stiffer and more linear throughout the stroke. Can't wait to drive it and really feel how they work.
Here is a snippet I found on the web, along with a pic
Race Tech Emulators
How does a Race Tech Emulator work and why is it so good?
Some people have asked if Emulators really emulate something. Well, the full name of these wonderful devices, brought to the market in 1993 by Race Tech's owner/founder Paul Thede, is Race Tech Cartridge Emulators. So yes, they do emulate something: Cartridge forks.
RT (Race Tech) Emulators are little devices that use a single shim to control the compression damping of the fork. The shim sits on top of a machined brass housing that is placed between the damper rod and the fork spring. When the forks are compressed, oil is forced up the damper rod and toward the Emulator. Oil is then forced through a small orifice on top of the Emulator. This orifice provides the LSD. When the velocity increases, the shim opens to let oil pass through. This shim controls HSD. As the forks are rebounding, a check valve underneath the body of the Emulator opens to let oil pass back thought the Damper Rod. The Emulator does nothing to affect the rebound damping characteristics of the forks.
Changes to the compression damping are made with changing the preload on the valve spring. As you increase the preload you increase both the LSD and HSD although, it will have more of an effect on LSD. Decreasing the preload on the valve spring will decrease both the LSD and HSD and again, it will have more of an effect on the LSD. Changes to rebound damping are made with a change in fork oil weight. If you desire more rebound damping, increase the fork oil weight. If reduced rebound damping is desired, decrease the fork oil weight. Be aware that changing the oil weight will also have an effect on compression damping.
The single greatest advantage to the addition of the RT Emulator is the ability of it to provide a linear damping curve. Put simply, your damping rod forks will now work like cartridge forks. What does this mean to you? Your damper rod forks can be tuned to provide increased LSD and decreased HSD. Your bike will dive less under braking, and it will soak up the nastiest of bumps and expansion joints. You will be riding down the highway with more comfort, and riding your favorite back roads with greater speed and a greater margin of safety. Are they really that good you ask? Yes they are! As many have said, "the best $140 you can spend on your bike."
