Nitrous Express EFI NITROUS PLATE SYSTEM FOR GT500 User Manual
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8. At this point both solenoids should be tested for proper operation. Note: (Be sure the nitrous bottle is
off and there is no pressure in the N2O supply line). If you are using a fuel safety pressure switch you
must use a jumper wire between the NO and C terminals when testing the solenoids. 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 solenoids open. IMPORTANT: Make sure that both of the
solenoids are clicking! If no sound is heard or only one of the solenoids is working, check all wire
connections and the wiring schematic for proper connections.
9. With all components mounted and all hose and electrical connections made under the hood connect the
feed line to the nitrous bottle and slowly open the valve listening for leaks. When it is confirmed that
there are no nitrous leaks activate the fuel pump and check for fuel leaks. With the pump running
gently break the connection between the hose from the fuel rail to the fuel solenoid to bleed any
trapped air out of this line. IMPORTANT NOTE: Before continuing be sure no raw nitrous has been
injected into the engine during testing of the electrical system. If ANY nitrous was accidently injected
you must disconnect the coil wire(s) and rotate the engine with the starter motor for at least 10 seconds
with the throttle body completely open to clear the engine of all residual nitrous. After you have
verified that there is no fuel or nitrous leaks start the engine.
10. For wiring instructions on the Auto Learn TPS sensing WOT switch please se
instructions.
Note: The nitrous and fuel solenoids are rated only for intermittent duty. Do not engage either solenoid
for more than 20 continuous seconds. Solenoids that have “burned or scorched” electro-magnets will not
be replaced under warranty.
After a complete check and verification of all components of the system for proper installation and
operation it is time to have some fun.
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. NOTE:
All vehicles equipped with factory rev-limiters should take extreme care not to over-rev the engine. If the
rev-limiter is engaged with the N2O system on, serious engine damage could result. An aftermarket RPM
window switch (NX PN# 18959) should be used to disengage the N2O system 200 RPM’s before the rev-
limiter activates. Your NX system is now ready for regular usage.
SAFETY TIPS:
Do not attempt to start engine if nitrous has been accidentally injected while the engine was not
running. Disconnect coil wire(s) and turn motor with throttle wide open for several revolutions before
attempting to restart. If it is not possible to disable the ignition then the spark plugs must be removed and
the engine cleared of all nitrous before attempting to start engine.