Manual

3
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 compart ment 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). Imme diately 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 after market 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
reli able, inexpensive NX fuel pressure regulator (PN 15951). Any
high quality regulator can be used with our system.
2. Your NX system requires a dedicated fuel
pres sure 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
reli ability 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.
How ever, 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”, unregu lated 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.