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EFI
INSTALLATION INSTRUCTIONS FOR:
MainLine Nitrous Systems
CAUTION: An experienced technician familiar with
the use and handling of high-pressure cryogenic gases
should install this system. If you have any doubt about
your skills this system should be taken to a qualied shop
for installation. If you have decided to attempt the install
yourself please read and understand all of these instructions
before you start. Some of these instructions may or may not
apply to your vehicle, if you have any questions please call
our tech department 940-767-7694 9:00A.M. -4:00P.M. CST.
NOTE: In the interest of keeping costs low some commonly
available pieces have been omitted from MainLine Nitrous
Systems. This list of items is necessary to complete the
installation:
CARB
minimum of 4-5/16, grade 5, bolts with washers
must be used for a safe installation. The bottle
should be mounted as shown in Figure “A”.
Check beneath oor for obstructions such as fuel
tank, fuel lines, electrical wiring, etc before drilling
holes.
2. Have the nitrous bottle lled with “NY-TROUS
+” nitrous oxide. A local speed shop or a welding
supply shop can usually handle this.
• 14 & 18 gauge automotive type multi-strand wire
• 30 amp relay (optional)
• 4- 5/16 X 1 bolts, washers, and nuts (to mount nitrous
bottle)
• Misc wire ends and connectors
• 3/8 fuel Tee, clamps, and rubber hose (carbureted only)
Before starting, disconnect the negative terminal on the battery.
If you have any questions about your particular car consult a
shop manual.
These instructions are divided into 6 sections:
1. Mounting the Bottle & Routing the Supply
Line
2. Mounting the Plate/Nozzle & Solenoids
3. Plumbing the Fuel System
4. Wiring
5. Testing the System
6. Power Tuning Tips
Mounting the Bottle & Routing the Supply Line
1. Assemble the nut and nipple on the bottle as
shown in Figure “A”. The nitrous bottle should
be mounted outside the passenger compartment; if
this is not possible an external venting blow down
tube is a necessity (NX PN 11708 & 11709). A
Figure A
To route the supply line drill a ¾ hole beneath the valve discharge
port. Before beginning the routing procedure place tape over
both ends of the line. Now route the line beneath the car being
sure to avoid all exhaust, suspension and other moving parts.
Following the factory fuel line is usually the safest. Be careful to
avoid any positive 12-volt sources. One small spark to the outer
braid of the line will destroy it. Secure the line carefully, zip ties
work best here. Before connecting the line to the bottle, purge
the line of all possible debris by carefully blowing compressed
air through the line for several seconds. Connect the line to the
bottle nipple and tighten securely.
Mounting the Plate/Nozzle & Solenoids
If your car has a carburetor skip to section “B”, if your car is EFI
use section “A”:
Section “A” EFI:
1. The nitrous/fuel discharge nozzle should be
mounted in the air duct that connects the air cleaner
to the throttle body.
2. Drill a ¼ inch hole between the MASS Air Meter
and the throttle body in the plastic ducting.
3. Thread the nozzle into this hole until all threads are
covered. Be sure the nozzle discharges toward the
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engine.
4. Using the horsepower jetting chart select the
desired jets. Insert the jets into the nozzle ttings
being sure to insert the correct nitrous and fuel jets
into the correct ttings.
5. After installing the ttings into the solenoids (see
Figure “B”) connect the Fuel and Nitrous solenoids
to the nozzle with the D-3 braided lines, paying
attention to connect the nitrous solenoid to the
tting labeled Nitrous on the nozzle and the fuel
solenoid to the tting labeled Fuel
Connect the previously cleaned supply line to the Nitrous
Solenoid and tighten securely
Section “B” Carbureted:
1. Using the horsepower jetting chart select the
desired jets. Insert the jets into the nitrous plate
ttings being sure to insert the correct nitrous and
fuel jets into the correct ttings
2. After installing the solenoid ttings (see Figure
“B”) Pre-assemble the nitrous plate, attaching the
fuel solenoid to the fuel tting on the plate using
the 3/16 stainless jumper line. Repeat this step on
the nitrous solenoid side. Do not over-tighten these
ttings
3. Referring to a shop manual for your vehicle, follow
the instructions for removing the carburetor.
4. Referring to the shop manual remove the original
carb studs and install the extra long studs furnished
with the system.
5. Install the pre-assembled nitrous plate using the
new gasket between the intake and the plate and
existing gasket between the plate and the carb.
(Note: Always install the plate with the fuel
solenoid facing forward and the text on top of the
plate up.)
6. Referring to the shop manual reinstall the
carburetor.
entering the fuel system. Debris can cause a
catastrophic engine failure due to clogged fuel
jets or injectors.
Section “B”
Note: The MainLine carbureted nitrous system
requires up to 10 PSI on the fuel enrichment
circuit and must be fed by a high volume
fuel pump. A minimum 110-gallon per hour
pump is recommended to feed the engine and
nitrous system. A dedicated fuel system for the
nitrous system only is neither necessary nor
recommended.
1. Locate the line connecting the fuel pump to the carburetor.
This line must be cut and a tee installed. Connect this line to
a dedicated fuel pressure regulator feeding the nitrous system
fuel solenoid. This regulator should be set according to the
recommended pressures listed on the card located in the system
jet pack. This pressure may need to be adjusted higher or lower
to tune the nitrous system to it’s highest potential. The tee, hose,
clamps, and regulator must be ordered separately from NX or
sourced from your local parts store. Recommended NX part
numbers are: Regulator PN 15951, 3/8 barbed hose “T” PN
16137. Caution: When cutting any fuel lines be sure to
prevent any debris from entering the fuel system. Debris can
cause a catastrophic engine failure due to clogged fuel jets or
fouled needle and seats.
Plumbing the Fuel
If your car has a carburetor skip to section “B”, if your car is EFI
use section “A”:
Section “A”
1. Locate the supply line connecting the fuel lter to
the EFI fuel rail. This line must be cut and a Tee
inserted to supply fuel to the nitrous system. Use
extreme caution; this line contains ammable fuel
under high pressure. Carefully cut this line and
insert the Tee tting. Use the supplied clamps
to secure a leak free installation. Note: If your
vehicle has a rigid plastic fuel line, an alternate
method to tap this line must be used. Do not
attempt to cut this type of line.
2. Route the supplied rubber fuel hose from the Tee
tting to the fuel solenoid. Secure this line with
the supplied clamps. Caution: When cutting any
fuel lines be sure to prevent any debris from
Figure B
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Wiring the System
grd
acc power
NEG
POS
12 Volt Battery
+
Ground
Switched
12 Volt +
Black 12 Volt +
to Battery
Optional Fuel
Pressure Safety
Switch
White
Ground
Ground
Green
Ground
Ground
Relay
Red
Must be Grounded
18GA
14GA
18GA
18GA
18GA
18GA
14GA
14GA
Nitrous
Fuel
grd
acc power
To Keyed 12 Volt +
14GA
14GA
14GA
18GA
14GA
Nitrous
Fuel
Testing the System
1. Follow the wiring diagram in Figure “C” if no relay is being
used, follow the diagram in Figure “D” if a relay and wide open
throttle is being used (recommended). For proper operation do
not vary from this diagram. Solder and seal all connections with
tape or heat shrink tubing (recommended)
Figure C
1. Recheck all installation procedures to be sure
nothing has been omitted.
2. Be sure the nitrous bottle has not been opened and
the supply line is empty!
3. Reconnect the Negative battery cable.
4. Using the toggle switch “ARM” the system.
5. Test solenoid operation by using the system
activation switch. You should hear both solenoids
“CLICK”. If they do not, re-verify all wiring and
retest the system.
6. Carefully open the nitrous bottle and verify that no
ttings or hoses are leaking. Correct any leaks
before proceeding.
7. Do not start the engine if nitrous has been
accidentally injected while the motor was not
running! All nitrous must be cleared from the
engine before starting! A violent intake manifold
explosion could occur!
8. Start engine and check for any fuel leaks. Correct
any leaks before proceeding.
9. The MainLine Nitrous System is now ready for
normal usage.
Additional parts recommended to operate your MainLine nitrous
system satisfactorily:
Note: 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.
Figure D
• Nitrous Pressure gauge (NX PN 15509)
• Purge Valve (NX PN 15600)
• Wide Open Throttle Switch & Bracket (NX
PN 15516 & 15517)
• Bottle Jacket (NX PN 15945)
• Fuel pressure Safety Switch (NX PN 15708
carb or 15718 EFI)
• 30 Amp Relay (NX PN 15515)
• Bottle heater (NX PN 15940)
• NHRA legal blow down vent tting (NX PN
11709)
• NHRA legal blow down vent tube (NX PN
11708)
• Chemical X Octane booster (NX PN 16003)
• Ford EFI fuel rail tting eases installation on
Ford products (NX PN 16179)
These or any other MainLine parts can be ordered by calling 1888-289-6261 9:00 A.M. – 4:00 P.M. EST
Power Tuning Tips
Nitrous oxide works well with all applications; 4 cycle, 2 cycle,
diesel, and rotary 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”.
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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 very high cylinder
pressures. The stronger 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.
4. Most MainLine EFI applications will require no timing
retard. You may run as much timing as you normally would,
if you have adequate octane to prevent detonation. MainLine
recommends Chemical X (NX PN16003) octane booster to
insure trouble free nitrous usage.
5. Carbureted vehicles using stock compression ratios may not
need any timing retard when using the smallest horsepower
settings, however for higher compression engines timing
retard is a necessity. A base line setting of 1-2 degrees of
retard for every 50 horsepower of nitrous boost is a safe
starting point. More or less timing may be required, reading
the spark plugs is the only safe way to determine if you
have the right amount of timing for your particular engine
combination.
6. Your fuel system is also an integral part of the nitrous
system, be sure it is in top shape and all lters are clean.
7. Engine operating temperature should be at or above 160
degrees prior to nitrous usage.
8. Never “lug” your engine and engage the nitrous system, use
the system at wide-open throttle only, nitrous should not be
used below 2000 rpm’s. If you do any of the above a serious
“Back Fire” could result in engine damage.
9. The better the exhaust system the better the nitrous system
will work.
10. Do not attempt to drill or alter the jets, solenoids, or the
nitrous plate (carb only). These items are engineered to
their maximum capability. Any modication you can make
will decrease power and destroy engine parts.
11. 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.
12. 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 1,050
PSI the system will run rich and will not produce the
advertised horsepower. If the bottle pressure is above 1,050
PSI the system will run lean, possibly damaging engine
parts. This pressure is easily monitored by using a liquid
lled pressure gauge (NX PN 15509). Note: When the
ambient temperature is below 97 degrees a bottle warmer
is required (NX PN 15940). A bottle jacket (NX PN15945)
will help stabilize bottle pressure in the winter and summer.
CAUTION: NEVER USE AN OPEN FLAME TO HEAT
A NITROUS BOTTLE. THIS IS A VERY DANGEROUS
AND POTENTIALLY FATAL PRACTICE!!!!!!!!!!!
13. A purge valve (NX PN15600) is recommended on all
MainLine systems. When the weather begins to get hot a
purge valve is worth up to a tenth of a second on a ¼ mile
pass. Note: The correct purging procedure for drag racing
is: 1. Complete the burnout. 2. Light the pre-stage bulb.
3. Push the purge button three times, one second each. 4.
Stage immediately, GO FAST.
14. If there is a question about the purity of your nitrous supply,
a lter (NX PN15607) should be used when relling your
bottle. Just attach the lter to your bottle when you take it to
be relled. Contaminated nitrous will cause serious damage
to the nitrous solenoids and possibly to your engine. This is
a lifetime renewable lter.
15. If you have questions about the suitability of your torque
converter or gear ratios, call the factory tech line for the
inside scoop.
16. Your nitrous bottle should be turned off when not in
use (even between runs). An remote bottle opener (NX
PN11107) will make this task much easier.
17. Start with the lowest power setting in your system.
Remember start out small and work your way up, MainLine
systems produce more real horsepower than any other brand
on the market today.
18. If the solenoids must be disassembled for cleaning or
rebuilding always use the proper wrench (NX PN 15921).
Do not use any clamping devise on the solenoid tower,
instant non-warranty, damage will result.
19. Premium grade unleaded or leaded fuel is required on all
Mainline nitrous applications. If your engine has been
modied or has higher than stock compression racing fuel
may be required. MainLine recommends Chemical X (NX
PN16003) octane booster to insure trouble free nitrous
usage.
20. All vehicles, including full competition racecars, 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!
21. If you notice some of the N2O-fuel orices are not perfectly
aligned in your MaiLine plate system, do not be concerned.
This misalignment has been engineered into the system to
direct fuel to specic cylinders.
22. If you have trouble with your MainLine system or any
related parts, call your dealer rst. 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
MainLine 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 MainLine System.
DO NOT LISTEN TO:
A. YOUR BUDDY!
B. YOUR BUDDY’S FRIEND!
C. THE LOCAL NITROUS GURU!
D. ANY ARTICLE IN ANY MAGZINE
If you follow the foregoing suggestions, your MainLine system
will operate trouble free and provide years of thrills. ABOVE
ALL REMEMBER TO RACE SAFE AND HAVE FUN!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!
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