Nitrous Express 21000 User Manual

PN 21000

DRY NITROUS INSTALLATION INSTRUCTIONS

Congratulations on the purchase of your Nitrous Express Dry Nitrous System. This system does not add

fuel and is intended to be used with an engine management system that can add nitrous enrichment fuel
through the engines injectors Nitrous Express utilizes only the highest quality components designed for the

use of liquid nitrous oxide. To properly uti lize these specially designed components and obtain the trouble­free operation that this system is capable of producing, it is extremely important that you read all
instructions carefully. Pay special attention to the important notes at the end of the installation steps and the
tuning tips listed at the back of this instruction sheet.

To insure proper system assembly and operation, carefully read the following installation procedures
thoroughly before beginning. Use NX thread sealer on all pipe thread connections, DO NOT use any sealer on
flare connections, hose, or bottle connections. Use no other sealing compounds or Teflon tape. All threads
must be clean and dry, apply only enough sealer to wet the threads, too little is better than too much.
Excessive tighten in g of part s i s n ot neces sary, snug is enough. If it is necessary to remove a fitting installed
with the red NX sealer heat must be applied to release the sealing agent. NOTE: Due to shipping restrictions
all NX nitrous bottles arrive empty. Before beginning the installation the N2O bottle should be filled by a
NX accredited filling station.

Before starting an y installation procedures care- fully disconnect the vehicle negative battery cable. If
there is any question about this operation, consult the vehicle owner’s manual!

MOUNTING THE BOTTLE

Slide bottle into bottle brackets. Use illustration (A) as a guide for proper alignment. Locate bottle
assembly in a mounting area that will provide easy access to bottle valve, for hose connection and bottle
removal. Using the bottle unit as a pattern, mark and drill four 3/8” holes. Note: Before drilling holes be
sure to check beneath the area being drilled for obstructions, fuel lines or fuel tank. Then secure unit to
mounting surface. (Recommend minimum of four 5/16” grade five bolts). Align bottle in brackets so that
the valve outlet is pointing down- ward to the mounting surface (See Illustration A) and tighten the bottle
bracket bolts. NOTE: This is VERY IMPORTANT so that the internal siphon tube will pick up liquid
nitrous.

ILLUSTRATION A

SOLENOID MOUNTING

1. The NX Dry nitrous s ystems are supplied with the world’s most sophist icated N2O solenoid. Pay special

attention to the “inlet-outlet port arrangement. The inlet port is the location for the N2O filter fitting, the

purge port is for the optional purge valve. If no purge valve is used a 1/8 NPT plug is provided to
block this port. The nitrous discharge port is marked “outlet port”. The blue 3AN line which goes to the

nozzle should be connected to the “outlet port”.

2. Install all solenoid fittings using the provided liquid red NX thread seal er (NO TEFLON TAP E!) at this
time.

3. The solenoid mounting bracket is designed to be universal. Start by mounting the solenoid bracket to the
base of each solenoid. Do not tighten! You may have to flip the mounting bracket over to align the
solenoid for the proper orientation. Locate an existing screw, bolt, or stud to mount the solenoids.
Choose a location that allows the nozzle feed line some slack to prevent any flow restrictions or
influence on the nozzle. Tighten all mounting screws and mount locations securely now. Note: The
solenoids may be mounted in any position, on their sides or upside down.

4. Thread the N2O steel braided line onto the Nitrous solenoid outlet and to the nitrous nozzle.

5. The bottle-feed line will be attached to the N2O solenoid on the “inlet” side of the solenoid.

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 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 restricting nitrous
flow. If routed under vehicle, locate and drill a
for the main feed line. Starting at the bottle nipple, route the line to the engine compartment. Following
the factory fuel lines is usually the best path. No te: Keep max i mum clearance betw een all moving parts,
suspension components and hot engine components, securing the supply line where possible (“Zip Ties”
are the best fo r securing the feed line). Be especially careful of the feed line being nea r any “HOT”
electrical leads, o ne small spark will destroy the Teflon liner causing a nitrous leak. Before you at tach th e
nitrous supply line to the 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
truck and any people. Wearing a glove is recommended). Immediately after the purg ing 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!

ELECTRICAL HOOK-UP

1. Mount the toggle (Arming) switch in a location that is within easy reach of and in plain sight of the

diver.

2. Using 14-ga. wire and connectors supplied in the switch kit, connect a HOT lead (12 VDC

POSITIVE) to the “Power” terminal of the toggle switch. (Use a 10 amp in line fuse if desired). This

power source must be controlled by the ignition switch (See Wiring Schematic).

3. Connect a grounded wire to the “Ground” terminal of the toggle.

4. The system is furnished with a universal wide- open throttle switch. This WOT micro-switch

is designed to work with the universal mounting bracket. It’s maximum capacity is 10 AMPS and

should only be used to activate low amp draw accessories or in conjunction with a relay.

3/4

inch diameter hole in a su itabl e area near the bottle valve

A. T he WOT Swit ch must be mounted inside the vehi cle using the accelerator pedal to acti vate the

nitrous system.

B. 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.

C. 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.

D. 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

5. Attach an 18-ga. ju mper wire from the remaining terminal “ACC” of the toggle switch to one of the
terminals on the wide open throttle switch.

6. Using the 18-ga. wire supplied with the system, co nnect the remaining wide-open throttle terminal to
the relay’s small red wire. (See wiring diagram).

7. Connect the white wire of the relay (terminal 86) to chassis ground. Connect the black wire of the rela y
(terminal 30) to 12 volt battery positive. Connect the green wire of the relay (terminal 87) to one wire
of the nitrous solenoid. Connect the remaining wire of the nitrous solenoid to chassis ground.

8. Attach the remaining solenoid wire to ground.

9. Reconnect the battery cable.

10. At this point the solenoid should be tested for proper operation. Note: (Be sure the nitrous bottle is off
and there is no pressure in the N2O supply line). To test, turn the “arming” toggle switch to the ON
position and push the “activating” wide- open throttle switch. A clicking sound should be heard as the
solenoid opens. IMPORTANT: Make sure that the solenoid is clicking! If no sound is heard, check all
wire connections and the wiring schematic for proper connections.

11. With all components mounted, feed line and electrical connections completed, connect the nitrous
supply line to the bottle and FULLY open the bottle valve and carefully check connections on the
system for leaks and retighten fittings if necessary.

12. After a complete check and verification of all components of the system for proper installation and
operation it is time to have some fun.

Note: The nitrous solenoid is rated only for intermittent duty. Do not engage this solenoid for more than
20 continuous seconds. Solenoids that have “burned or scorched” electro-magnets will not be replaced
under warranty.

WIRING SCHEMATIC

SAFETY TIPS

1. Never permit oil, grease, or any other readily combustible substances to come into contact with nitrous
cylinders, valves, solenoids, hoses and fit- tings. Oil and certain gases (such as oxygen and nitrous
oxide) may combine to produce a flammable condition.

2. Never interchange solenoids or other appliances used for one compressed gas with those used for
another.

3. Identify the gas content by the label on the bottle before using. If the bottle is not identified to show the
gas contained, return the bottle to the supplier.

4. Do not deface or remove any markings, which are used for content identification.

5. Cylinder valves should be closed except when nitrous is actually being used.

6. Notify supplier of any condition, which might have permitted any foreign matter to enter the valve or
bottle.

7. Never drop or violently strike the bottle

8. Keep valves closed on all empty bottles to prevent accidental contamination. Open the bottle valve for
an instant to clear opening of any possible dust or dirt before usage. Aim bottle outlet away fro m all
body parts. Do not point it in the direction of a person.

9. If there is a question about the purity of your nitrous supply, a filter (PN15610 or 15607) should be used
when refilling your bottle. Just attach the filter to your bottle when you take it to be refilled.
Contaminated nitrous will cause serious damage to the nitrous solenoids and possibly to your engine.
This is a lifetime renewable filter.

10. Your nitrous bottle should be turned off when not in use (even between runs). An NX remote bottle
opener (PN 11107) will make this task much easier.

11. If the solenoid must be disassembled for cleaning or rebuilding always use the proper wrench (PN

15921). Do not use any clamping devise on the solenoid tower, instant non-warranty, damage will
result.

TESTING AND USING THE SYSTEM
All NX systems are designed for off road usage. Use extreme caution and observe all safety precautions (see

your vehicles owner’s manual). Select a suitable test area; your local racetrack is best. Arm the system with
the cockpit N2O arming switch. Gently launch the vehicle, gradually accelerating to wide-open throttle.
When WOT is achieved a noticeable surge of power should be produced. If not stop and recheck all
installation procedures. Call the factory tech line if the problem cannot be located. Your NX system is
now ready for regular usage.

POWER TUNING TIPS:

Nitrous oxide works well with all applications; 4 cycle, 2 cycle, diesel, and rotar y engines. Each one has
individual tuning characteristics, and these tips apply generally to each one. Nitrous oxide is referred to as
“Liquid Supercharging” because it, in effect, does the same thing as a mechanical supercharger, forcing
more fuel and oxygen into each cylinder, thus producing more power. The biggest enemy of all
supercharged, turbo charged and nitrous injected engines is “DETONATION”. The use of higher-octane
fuel, and or a combination of better fuel and timing retard can control this. Remember detonation is a spark
plug, head gasket and engine “KILLER”.

1. Your engine should be tuned to its maximum power prior to nitrous usage.

2. The ignition is an integral part of the nitrous system and must be able to ignite the mixture under ver y
high cylinder pressures. The hotter the spark the better!

3. In stock engine applications and street usage the spark plugs should be at least 2 steps colder than stock.
Do not use platinum tip, extended tip or any plug with multiple ground straps or split ground straps.
When in doubt about heat range always go one step colder. A spark plug that is to “Hot” will cause
detonation, burned plugs, poor performance, and engine damage. In competition engines always use the
coldest plug available. Never use an extended tip plug in a racing engine.

4. The NX nitrous system is so advanced, (technology, engineering, and workmanship) that hu ge amounts
of timing retard is not required. You may run as much timing as you normally would, if you have the
octane required to prevent detonation. We recommend 1 degree timing retard for each 50 horsepower
boost as a starting point. Your engine may need more or less depending on your combination.

5. Your fuel system is also an integral part of the nitrous system, be sure it is in top shape and all filters are
clean.

6. Engine operating temperature should be between 160 and 200 degrees prior to nitrous usage.

7. Never “lug” your engine and hit the nitrous system, use the system at wide-open throttle only, nitrous
should not be used below 3000 rpm’s. If you do any of the above a serious “Back Fire” co uld resul t in
engine damage.

8. The better the exhaust system the better the nitrous system will work.

9. Do not attempt to drill or alter the jets, solenoids, or the tubes in the nitrous plate. These items are
engineered to their maximum capability. Any modification you can make will decrease power and
destroy engine parts.

10. Do not mix or attempt to match any other brand solenoids with this system. Do not attempt to mix or
match any other brand plate or nozzle with this system. Do not attempt to use any other brand kit as a
second stage with this system. Our nitrous technology is far superior to any of our competitors. Any
attempt at this could lead to serious engine damage.

11. All of our systems are designed to operate at 1050 PSI bottle pressure. This is extremely important and
cannot be stressed enough. If your bottle pressure is below 1050 PSI the system will run rich and will
not produce the advertised horsepower. If the bottle pressure is above 1050 PSI the system will run lean,
possibly damaging engine parts. This pressure is easily monitored by using a NX liquid filled pressure
gauge (PN 15509). Note: When the ambient temperature is below 97 degrees a bottle warmer is
required (PN 15940 or 15941). An NX bottle jacket (PN15945 or 15946) will help stabilize bottle
pressure in the winter and summer.

CAUTION: NEVER USE AN OPEN FLAME TO HEAT A NITROUS BOTTLE. TH IS IS A VERY
DANGEROUS AND POTENTIALLY FATAL PRACTICE!!!!!!!!!!!

12. A purge valve (PN15600-15601) is recommended on all NX systems. When the weath er begins to get
hot a purge valve is worth up to a tenth of a second on a 1⁄4 mile pass. Note: The correct purging
procedure for drag racing is: 1. Complete the burnout. 2. Light the pre-st age bulb. 3. Push the purge
button three times, one second each. 4. Stage immediately, GO FAST.

13. If there is a question about the purity of your nitrous supply, a filter (PN15610 or 15607) should be used
when refilling your bottle. Just attach the filter to your bottle when you take it to be refilled.
Contaminated nitrous will cause serious damage to the nitrous solenoids and possibly to your engine.
This is a lifetime renewable filter.

14. If you have questions about the suitability of your torque converter or gear ratios, call the factory tech
line for the inside scoop.

15. Your nitrous bottle should be turned off when not in use (even between runs). An NX remote bottle
opener (PN 11107) will make this task much easier.

16. Start with the lowest power setting in your system. Don’t try to be the track “Hero” on your first pass.
Remember start out small and work your way up, NX systems produce more real horsepower than any
other brand on the market today.

17. If the solenoids must be disassembled for cleaning or rebuilding always use the proper wrench (PN

15921). Do not use any clamping devise on the solenoid tower, instant non-warranty, damage will
result.

18. If you run an NX system of 150+ horsepower you must use a high octane racing type fuel. These are
some tips to help you choose and maintain the correct fuel for your application:
A. The most important statistic you should look for in the fuel specifications is the “MON” or motor

octane number. In most cases the higher the number the more timing you can run and detonation
will not be a problem

B. Most V-8 or V-12 engines with stock compression will run on “93” unleaded pump gas with up to

150 horsepower boost, most 4 or 6 cylinders with stock compression can use up to 75 horsepower.

C. Racing engines with 10-1 compression or higher must run racing fuel. The higher the compression,

and the higher the boost, the higher the “MON” must be.
D. With nitrous usage usually the highest “MON” available is the one that should be used.
E. All NX systems are calibrated to use fuel with .730 specific gravity or “SG”. If you use a fuel with a

lower “SG” you must use a larger fuel jet to compensate for the li ghter fuel. If you use a fuel with a

higher “SG”, a smaller fuel jet will be required. Most unleaded pump gas is .730 SG or above.
F. Racing fuel should be stored in an airtight, dark container. Exposure to atmosphere allows very

important elements to evaporate, lowering the octane of the fuel. Sunlight oxidizes the lead

contained in racing fuel, since this is the most important ingredient used to raise octane it must be

protected.
G. Never leave the fuel in your car between race days. This allows evaporation of the very important

“High end” hydrocarbons and lowers the octane of the fuel.
H. Never buy racing fuel from an underground or vented storage tank. Always demand to see where and

how the fuel is stored, a sealed drum is the only correct way.
I. AV gas or aviation fuel is not compatible with nitrous usage, don’t be tempted by the cheap price,

instant engine damage will result!
J. For a fuel recommendation, contact your NX dealer.

19. All vehicles, including full competition race cars, must have an alternator to provide adequate amperage
required by today’s racing accessories. Add up all the amps required by your car, you’ll be surprised!

20. If you notice some of the N2O-fuel orifices are not perfectly aligned in your NX plate system, do not be
concerned. This misalignment has been engineered into the system to direct fuel to specific cylinders.

21. If you have trouble with your NX system or any related parts, call your dealer first. If you still need help
call the factory tech line 940-767-7694 9:00 AM - 4:00 PM Mon-Fri. We are the nitrous experts and
will give straight answers to your questions.

In conclusion……….
This instruction sheet and power tuning tips are valid only for a NX system. If you have a kit from another
manufacturer this information will not help you! A tune up from any other brand of nitrous kit will not
work with the NX “Next Generation” technology.
DO NOT LISTEN TO:
A. YOUR BUDDY!
B. YOUR BUDDY’S FRIEND!
C. THE LOCAL NITROUS GURU!
D. ANY ARTICLE IN ANY MAGAZINE
If you follow the foregoing suggestions, your NX system will operate trouble free and provide years of

thrills. ABOVE ALL REMEMBER TO RACE SAFE AND HAVE FUN!