Nitrous Express Honda NXL - Manual (Page 2)

the fuel pressure hose and the stock fuel regulator,
applying a rag to catch any fuel. Then loosen the
small 10mm nuts on the fuel rail mounting brackets.
Remove fuel rail and injectors. (Note: When the rail
and injectors get pulled up and away, do not let any-
thing drop down your injector holes.) Next, pull out
the plastic rail spacers. They are not needed since the
new system has its own brackets. Finally, remove the
injector seals (large thick o-rings) from the intake
ports with a screwdriver. Be careful not to lose or
tear these parts. After removing injectors, make sure
to inspect injector o-rings. Be sure they are still func-
tional, if not then replace with new o-rings.
INSTALLING NXL NOZZLES AND RAIL
First, slide the injector seal spacers into the
NXL injectors. (See Illustration B) (The spacers will
only be needed if the intake has the thinner injector
seals.) (See Illustration C) Next, secure the stock
injector seals on top of the spacers and place them
into the intake. A small dab of lubricating oil around
the NXL o-ring will ease the installation back into
the intake manifold. With all injectors installed in
the NXL nozzles, place the new fuel rail on top of
the injectors. Fit the rail brackets on the rail. Leave
the rail mounting bolts a little loose to make the rail
assembly slide into place easily. The three 10mm nuts
need to be tightened fi rst, then tighten the three rail
mounting bolts. (Make sure injectors turn during the
tightening steps.)
ILLUSTRATION B
ILLUSTRATION C1 ILLUSTRATION C2
ILLUSTRATION C3
NXL with
Thick O-ring
NXL with
Spacer
Thin O-ring Thick O-ring O-ring Spacer
Injector in NXL
ROUTING THE NITROUS FEED LINE
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 16-foot D-4AN nitrous feed line may be
routed to the engine compartment either through the
passenger compartment or under the vehicle. Route
the line carefully to prevent the possibility of restrict-
ing nitrous fl ow. If routed under vehicle, locate and
drill a 3⁄4 inch diameter hole in a suitable area near the
bottle valve for the main line. Starting at the bottle
nipple, (Do not attach line to the bottle nipple yet)
route the line to the engine compartment. Following
the factory fuel lines is usually the best path. Note:
Keep maximum clearance between all moving parts,
suspension components and hot engine components,
securing the supply line where possible (“Zip Ties”
are the best for securing the feed line.) Be especially
careful of the feed line being near any “HOT” electri-
cal leads; one small spark will destroy the Tefl on liner,
causing a nitrous leak.
INSTALLING JETS
Take extreme caution when installing jets. Be
sure to double check that the correct jets are in the
Nitrous (marked N2O) and Fuel (marked Fuel) fi t-
tings. (See Illustration D) NOTE: The NXL system
uses extremely small fuel jets and even the smallest
amount of debris will clog jets and cause engine
damage. Before fi nal installation’ use extreme care
to be sure that there is no debris or other obstruc-
tions in any part of the fuel system, including the
jet orifi ces.
ILLUSTRATION D
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