Nitrous Express DIRECT PORT (NOZZLE SYSTEM) - Manual (Page 3)

PLUMBING THE FUEL SYSTEM
1. Your NX system requires a dedicated fuel pressure regulator. If you use a multi stage system a regulator must be used for each stage.
Mount the regulator as close to the fuel solenoid as practical.
2. The N2O system fuel regulator must be fed by direct pump pressure. Do not connect the nitrous system fuel regulator through the carb
regulator.
3. All NX systems are designed to be tuned by flowing fuel pressures. This information can be found on the jetting card under FFP. Using
the NX Master Flo-check (PN 15519 or Pro Series
15529) this pressure can easily be calibrated. These flowing pressures are only a base line tune up and will generally be very rich. Fine-tune
your combination by reading your spark plugs after a full throttle pass. When the tune up for your combination is correct, the spark
plug should be almost completely white with little or no color on the porcelain. For the ultimate in reliability and safety, our fuel pressure
safety switch (PN 15708) should be used.
4. Note: A higher fuel pressure will not result in a “safer” system. Too much fuel can cause the same type of engine damage as too little fuel.
5. It is not necessary or recommended to use a dedicated fuel pump for your nitrous system, if you have followed our fuel pump guidelines.
However if you feel it is necessary to run a dedicated pump you must run a bypass return line u t i l i z i n g t h e p u r g e p o r t o n t h e f u e l
s o l e n o i d with a maximum .050 orifice to the fuel tank. This is mandatory to prevent fuel line airlocks. If you ignore this advice a
massive nitrous flash fire and explosion could result!!!
6. All NX systems are calibrated at 1050-PSI bottle pressure. The safe operating range is 900 PSI to 1050 PSI.
WIRING THE SOLENOIDS
1. Mount the master arming switch within easy reach, and plain sight of the driver.
2. The system is furnished with a universal wide open throttle (WOT) switch. This WOT micro-switch is designed to work with the
universal mounting bracket. Its maximum capacity is 10 AMPS and should only be used to activate low amp draw accessories or in
conjunction with a relay.
A. Assemble the micro-switch on the mounting bracket using the supplied
3⁄4” 4-40 bolts and nuts. The switch can be mounted in
several different configurations, select the position you require and tighten the bolts. Do not over-tighten; the plastic micro switch
can be damaged.
B. The mounting bracket is made of easily bend- able material and may be formed to any con- figuration that will allow it to place the
WOT switch in the proper location.
C. The activation arm on the micro-switch is extra- long. This allows you to twist, bend, or cut it to aid in the ease of installation.
3. The best power source for the nitrous system is the terminal on the back of the alternator labeled “BAT”. The next best power source is
directly to the “Positive” post on the battery. Do not try to “Splice” into the factory wiring harness for a power supply, this will not have
adequate amperage to operate the solenoids. If desired a 60 amp fuse may be installed in this circuit.
4. Follow diagram “C” when wiring the system, the relay must be used in all applications.
5. Solder all connections for a permanent trouble free installation.
6. The nitrous and fuel solenoids are rated only for intermittent duty. Do not engage either solenoid for more than 15 continuous seconds.
Solenoids that have “burned or scorched” electro-magnets will not be replaced under warranty.