Nitrous Express EFI NITROUS PLATE SYSTEM FOR HEMI User Manual
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4. Once all wiring is completed reconnect the negative battery cable.
5. This switch works with rising or falling TPS signal as long as it has at least a 1v deviation between
idle & wide open throttle. When in learn mode, the unit first does a 5 second idle signal analysis.
If too much signal noise is found, it flashes an error (this is to catch a bad TPS or when connected
to wrong wire).
6. Once the switch is wired according to the schematic, you will need to put it in learn mode. Learn
mode is achieved by pushing and holding the button for 3 seconds, at which point the GREEN
LED on the switch will blink slow. This tells you it is checking the TPS idle voltage. This takes
approx. 4 seconds. DO NOT change the throttle position during this time. Once the GREEN LED
turns off you can proceed.
7. Now take the vehicle to full throttle and back to idle two times. If the GREEN LED is ON solid,
then your TPS is set. If the GREEN LED is flashing, the TPS Switch detected a variation between
the 1st and 2nd full throttle position and as a a precaution, did not learn that setting. You will need
to turn off the switch and start the learn procedure again. If the GREEN LED is still OFF, the TPS
signal range may be too small or you have the switch connected to the wrong wire.
NOTE: Once the switch has learned your full throttle position, the GREEN LED will be ON
whenever the switch has power and the RED LED will be on when the switch sees full throttle.
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.