Continued
Types of nitrous systems.
These are three basic types of nitrous systems: dry, wet, and
direct port. The most misunderstood is the “dry” type of system.
A “dry” nitrous system simply means that the fuel required to
make additional power with nitrous will be introduced through
the fuel injectors (remember, fuel makes power, nitrous simply lets
you burn more of it). This keeps the upper intake dry of fuel. We
accomplish this by two methods. First, is to increase the pressure
to the injectors by applying nitrous pressure from the solenoid
assembly when the system is activated. This causes an increase in
fuel flow just like turning up the pressure on your garden hose
from 1/2 to full. The second way we can add the required fuel is
to increase the time the fuel injector stays on. This is accomplished
by changing what the computer sees, basically tricking the computer
into adding the required fuel. In either case, once the fuel
has been added, the nitrous can be introduced to burn the supplemental
fuel and generate additional power.
The second type of nitrous kit is the “wet” style of kit. These kits
include carburetor plate systems and add nitrous and fuel at the
same time and place (normally 3-4" ahead of the throttle body
for fuel injected applications or just under the carb as with plate
systems). This type of system will make the upper intake wet with
fuel. These systems are best used with intakes designed for wet
flow and turbo/supercharged applications.
The last type of system is the direct port system. Just as it’s name
implies, it introduces the nitrous and fuel directly into each intake
port on an engine. These systems will normally add the nitrous
and fuel together through a fogger nozzle or a NOSzle™. The
fogger nozzle mixes and meters the nitrous and fuel delivered to
each cylinder. This is the most powerful and one of the most accurate
type of systems. This is due to the placement of the nozzle in
each runner, as well as the ability to use more and higher capacity
solenoid valves. A direct port system will have a distribution
block and solenoid assembly which delivers the nitrous and fuel
to the nozzles by way of connecting tubes. Because each cylinder
has a specific nozzle and jetting (both nitrous and fuel), it is possible
to control the nitrous/fuel ratio for one cylinder without
changing that of the other cylinders. These systems are also one
of the more complicated systems when installation is considered,
as the intake must be drilled, tapped, and the “plumbing” made
to clear any existing obstructions. Because of this and the high
output of these systems, they are most often used on racing vehicles
built for the strain of such high horsepower levels.
"WET"
SYSTEM
Fuel and air mixture is distributed normally
through the factory electronic fuel injection
Nitrous and extra fuel are
injected into the air inlet
through a common nozzle
DIRECT PORT
SYSTEM
Fuel and air mixture is distributed normally
through the factory electronic fuel injection
Nitrous and extra fuel are injected into
the intake ports through individual nozzles
and jetted on a per-cylinder basis
"DRY"
SYSTEM
OEM Fuel Injection is "tricked" into supplying MORE fuel
to the engine, which compensates for nitrous
Nitrous Oxide only is
sprayed into the air intake
where it changes into a gas
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