This page has information on Nerve-specific hardware and suggested settings. For instructions on how to adjust your board, check the Shocker Electronics page which has updated information.
Adjusting your Dwell:
Dwell is the name for the amount of time the solenoid remains open, which is the approximate amount of time the Nerve valve will remain open, which is the amount of time pressurized air will be released to fire the paintball. Because of this, increases in dwell generally cause increases in velocity, and vice-versa (however there are working limits to this). Dwell can effect a number of things, including but not limited to, velocity, consistency, efficiency, and recoil.
The dwell setting on your marker is what allows the ram/hammer/bolt to fully cycle from shot to shot. If set too low, the bolt will half-stroke and the gun won't fire properly. If set too high, the valve will be open for too long and air will be wasted, decreasing efficiency. Because of this, it's generally best to use the lowest dwell setting possible, while still keeping it above the point where the marker has trouble firing.
There is no such thing as the perfect dwell setting. Some guns will require a higher setting than others, depending on the parts, manufacturing characteristics, weather conditions, etc etc. Each gun requires a bit of experimentation to find the optimal setting that should be used.
The default settings for dwell are 20-30 for a Parker solenoid, or 30 or more for a Humphrey solenoid. It is generally easier to just set the dwell and use the input pressure to alter your velocity, and to use the LPR pressure for fine-tuning velocity. I suggest an input of 180-240 psi for a good balance between efficiency and fire rate (using the new factory LPR extender and valve poppet). If you don't have the new parts your input will need to be higher, usually 220 as a minimum.
Setting your Pressure/Velocity:
Pressure adjustment is easier than messing with the electronics. The marker's input pressure is how you determine the velocity for your shots, so after setting your dwell simply use your pressure adjustment to achieve your desired velocity. Higher the pressure, higher the velocity; lower the pressure, lower the velocity. Use the vertical reg input pressure to find the "ballpark" velocity amount, then use the LPR to ajdust it in smaller increments.
Do not adjust your velocity through dwell. This will not yield good performance.
Primary Regulator Pressure: 
If you're using an HPA tank (preset or adjustable), the regulator on the tank is known as the primary reg. If your primary reg is adjustable, set the input pressure to 550-600 psi if you're using the stock vertical Max-Flo reg. If you have an adjustable screw-in tank, set the reg as high as it will go, under 800-psi.
Dwell and LPR Theory:
The combination of dwell, LPR pressure, and input pressure are all used to fire the ball correctly in a Nerve and most other hammer/valve designs. There are a lot of things that can be drwn from these three variables, some of which are listed here.
· Higher input pressures will provide more energy to fire the ball and as a result require the lowest dwell amount. However, the higher the input, the more force will be required to open the valve on the hammer's side.
· Higher dwell settings will leave the valve open for longer amounts of time, however if the LPR pressure is lower then usual it will be required to increase the dwell to compensate for the valve opening and closing slower than it would at other settings.
· Higher LPR settings will work with lower dwell times since the valve will open faster, hammer will move faster, but more air will be used on the part of the LPR.
· When adjusting the velocity using the input pressure, increases in pressure will generally increase the velocity as a result. However this depends on a balance of the LPR and dwell setting as well, since in some combinations the higher valve pressure will increase the force needed to open the valve on the other side (higher LPR or dwell would be needed). This is referred to as a velocity plateau and should be avoided (use a higher dwell and if possible a lower input pressure).
A high operating pressure (around 190-200 psi) is recommended to achieve the optimal, balanced LPR setup with the Shocker using an LPR. The use of an LPR on the Shocker is not required, and in fact you won't be able to decrease the pressure much more than 10 or 20-psi less than the operating pressure. The Evolve bolt kit offers the largest pressure drop between the LPR and operating pressure however even then it's only 20-psi maximum.
Related Links:
· Firing assembly
· LPR assembly