Nitrous Express CARBURETOR PLATE SYSTEMS - Manual (Page 3)

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NOTE: Place a piece of tape over the end of the hose to prevent debris from entering the feed line during
the routing process. The nitrous feed line may be routed to the engine compartment either through the
passenger compartment or under the vehicle. If the passenger compartment is chosen, route the line carefully
to prevent the possibility of restricting nitrous flow. If routed under vehicle, locate and drill a 3/4 inch
diameter hole in a suitable area near the bottle valve for the feed line. Starting at the bottle nipple (Do not
attach line to the bottle yet) route the line to the engine compartment. Following the factory fuel lines is
usually the best path (“Zip-Ties work well here). Note: Keep maximum clearance between all moving parts,
suspension components and hot engine components, securing the supply line where possible. Be especially
careful of the feed line being near any “HOT” electrical leads, even a small spark will cause a leak in the
steel braided line. Before you attach the nitrous supply line to the nitrous solenoid, purge the line of any
foreign matter that may have accidentally entered the line during installation. Do so by removing the tape
used during installation and blowing compressed air through the feed line. (Have an assistant hold the end of
the hose aimed away from the car and any people. Wearing a glove is recommended). Immediately after the
purging operation, connect the main feed line to the N2O solenoid and the nitrous bottle, tighten securely.
BE SURE ALL NUTS ON SOLENOID MAGNETS ARE TIGHT!
PLUMBING THE FUEL SYSTEM
Connect the fuel line from the NX fuel solenoid to your vehicle’s fuel supply.
A stock fuel pump will work with
our HITMAN nitrous system only! All others require an aftermarket high performance pump and regulator.
Remember, the fuel pump is an integral part of your NX system, for reliable, trouble free service, your pump
must match your cars performance.
NOTE: Hitman Systems are designed to operate with stock mechanical fuel pumps without a regulator. If
an electric pump is used a fuel pressure regulator set at 5 psi is required.
1. All NX systems are designed to use the reliable, inexpensive N X fuel pressure regulator (PN 15951). Any
high quality regulator can be used with our system.
2. 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.
3. The N2O system fuel regulator must be fed by direct pump pressure. Do not connect the N2O system regulator
through the carb regulator.
4. All NX systems are designed to be tuned by flowing fuel pressures. This information can be found on the
jetting card. Using the NX Flo-Check (PN 15519) or Master Flo- Check Pro (PN 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, an NX fuel pressure safety switch (PN 15708) should be
used.
5. 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.
6. It is not necessary for you to use a dedicated fuel pump for your nitrous system if the pump flows enough to
support your engine and nitrous power. However, if you feel it is necessary to run a dedicated pump you must
run a bypass line with a maximum .020 orifice from the “High Pressure”, unregulated side of your fuel
pressure regulator back to the fuel tank. This is mandatory to prevent fuel line air locks. If you ignore this
advice
a massive nitrous flash fire and explosion could result!!!
7. All NX systems are calibrated at 1000-PSI bottle pressure. The safe operating range is 900 PSI to
1050 PSI.