Often just called 'Solenoids' these are really solenoid valves. Their job is to switch the flow of nitrous or fuel on and off. The solenoid part of the unit is an electromagnetic device that applies a magnetic field to the valve's plunger when an electric current is applied to it. The valve part of the unit is what starts or stops the nitrous oxide or fuel flow. Put together we have an electrically controlled valve. Put 12V on it and it opens the valve, take the 12V off and it closes the valve. In regular nitrous oxide set-ups the solenoid is simply switched on to start the flow and off to stop it. The electric current coming from the wide open throttle switch. In set-ups with progressive or staged controllers the solenoids are 'pulsed' which is where the name 'pulsoid' comes from with some manufacturers. The pulse rate is constant but the width of the pulses is altered to make the valve's 'duty cycle' higher or lower. The more 'on time' that the solenoid gets the more nitrous or fuel it flows. Typically the valves are pulsed at 20 times per second. If the pulse width is 1/20th of a second then 20 pulses at 1/20th of a second equals a valve that is open all the time. If the pulse width is 1/10th of a second then 20 pulses at 1/10th of a second equals a valve that is open half of the time. You can now see that the former will give a full flow of nitrous or fuel and the latter will give half of the maximum flow. This method of control is known as 'pulse width modulation' or 'PWM'. Dynotune manufacture 2 stage nitrous controls rather than fully progressive nitrous controllers. The first stage of nitrous is a reduced 'shot' and then, after a programmable delay has expired, the full shot of nitrous is injected. We feel, for the cost, that this is a very simple and effective way of increasing traction and reducing stress on your engine when high HP gains are in use. To view the Dynotune nitrous control page CLICK HERE
