| III. Installing the Nitrous
Purge |
With the fuel supply line connected (rear) we can get
the nitrous feed and purge line hooked up. Here we are
installing the purge adapter fitting, supplied with the
ZEX purge kit. We'll attach a separate -3AN braided line
from the elbow fitting to the purge solenoid. |
We mounted the purge solenoid right behind the radiator
support so that the oulet line can be directed outside
the vehicle. The braided line from the adapter elbow is
connected to the inlet port on the solenoid. |
The nitrous purge exits through the supplied hardline.
The optional LED illumination module is mounted to the
end of the hardline as mocked up here. Where you choose
to mount the purge is a matter of taste and how you want
to show it off. |
We found a suitable and relatively inconspicuous place
under the front bumper to located the purge exit and LED.
When the nitrous line is purged the LED will light up
the exiting gas cloud - hopefully to the ammusement of
spectators. |
Wiring the purge solenoid and LED is quite simple and
does not involve any wiring to the management unit or
rest of the system. Ground either one of the wires from
the solenoid along with the black wire from the LED module.
Using a bullet connector, splice together the other lead
from the solenoid with the red lead from the LED as shown. |
The ZEX kit comes with plenty of 18ga. wire to get everything
routed where you want. Run a length of wire from the purge
solenoid hot wire, through the firewall, and up to one
of the terminals on the supplied push-button purge switch.
Connect the other terminal to a 12V source (the solenoid
will draw 10amps) using the inline fuse included in the
kit. |
| IV. Wiring the
System |
The beauty of the ZEX system is in the simplified wiring.
You only need to deal with three wires, and one of them
is ground. The red will route to the main system activation
switch. The white is the wide-open throttle trigger. |
The white lead from the nitrous management unit needs
to connect to the signal wire on the throttle position
sensor (TPS). We checked the Ford
Fuel Injection book by Probst to figure out the green
wire on the sensor plug carries the TPS signal. |
Using the "t-tap" connector we spliced the white
wire from the ZEX unit into the green TPS signal wire. |
We can verifiy the correct wire from the throttle positon
sensor by checking voltage (key on). With the throttle
closed the voltage will be just under 1V. The voltage
should rise up to 4.5V as the throttle is opened to maximum.
The other two wires in the sensor will read constant voltage. |
The hot leads for the management unit and the purge solenoid
are routed along the valve cover and throug the firewall
to the switches. |
Connect the red lead from the nitrous management unit
to the un-fused lead from the toggle switch. The fused
side connects to a 12V source (key-on ideally.) The system
will draw 10 amps so tap into a suitable supply. |
| V. Programming the Activation
Switch |
Once the system is wired up we can program the activation
switch that is built into the ZEX nitrous mangement unit.
It's important to perform this step with the nitrous bottle
valve shut. |
With the key-on (engine does not need to be running) toggle
on the nitrous arming switch. |
Press and release the programming switch on the nitrous
mangement unit. The indicator bulb will turn to solid
red, indicating the activation swtich is in "learn"
mode. |
After releasing the programming switch move the throttle
to wide-open position and hold for 10 seconds then release.
Go back to the nitrous management unit, the LED should
be flashing red to green to off indicating it has learned
the TPS voltage curve. |
Turn the activation toggle switch off and then on again.
The LED on the management unit should be steady green.
Without opening the bottle you can test for proper function
of the activation switch by pressing the pedal to the
floor and listening for the solenoids to click. |
The final step, once you have completed the wiring, is
to open the valve on the nitrous bottle and check the
system for leaks. A 10lb nitrous bottle usually costs
between $3 and $5 a pound to fill, and will last about
8 1/4 mile passes before you need to refill. Operate the
nitrous at 900-1000 psi for best results. If you need
to bring the pressure up place the bottle in the car and
turn the heater on. Never apply a torch or flame heat
to the bottle. |
| |
|
