Nitrous Express Hitman EFI - Manual (Page 5)

for more than 20 continuous seconds. Solenoids that
have “burned or scorched” electro-magnets will not
be replaced under warranty.
SAFETY TIPS
Do not attempt to start engine if nitrous has been
accidentally injected while the engine was not run-
ning. Disconnect coil wire and turn motor with throttle
wide open for several revolutions before attempting to
restart. If it is not possible to disable the ignition the
spark plugs must be removed and the engine cleared
of all nitrous before attempting to start engine.
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 flam-
mable 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 sup-
plier.
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 from
all body parts. Do not point it in the direction of a
person.
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”.
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 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 competi-
tion engines always use the coldest plug avail-
able. Never use an extended tip plug in a racing
engine.
4. The NX nitrous system is so advanced, (technol-
ogy, engineering, and workmanship) that huge
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 combi-
nation.
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 2000 rpm’s. If
you do any of the above a serious “Back Fire”
could result 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