2. Turn the arming switch to the ON position.
3. Depress the throttle switch and listen for both solenoids to click. If they both do not click, locate the
electrical problem and correct it before proceeding.
4. Start the engine and observe all fuel connections for any leaks. Fix any fuel leaks before proceeding.
5. Turn off the engine.
6. Open the nitrous bottle valve. Listen carefully for any leaks as your valve is opened. Leaks in the nitrous
supply line will be obvious because they will be covered in frost.
7. If everything checks out, close the nitrous bottle and relieve the line pressure.
Step 7: Check Fuel Quality & Ignition Timing
The last thing to do before enjoying your new nitrous system is to ensure that premium fuel (92 R/M Octane or
better) is in the fuel tank and that your ignition timing is set correctly. All recommended ignition timing retard
amounts, on the Tune-Up Sheet, are calculated off of the base, stock ignition setting. It is important to set this
with a timing gun before you use your nitrous system for the first time. Do not assume that it is set properly. If
the ignition timing is not set correctly, severe engine damage may occur.
Step 8: Enjoy!
After everything has been checked over and properly set-up, turn on the nitrous bottle and enjoy your ZEX
Nitrous System.
ZEX #82030 Nitrous System Tune-Up Specs
A word on why we have two different jet charts:
When nitrous is sprayed into an engine, the nitrous gas itself displaces a percentage of the air that is normally
drawn into the engine. Since engines that do not use a mass-air meter (i.e. speed-density) do not look at airflow,
this displaced air does not affect the amount of fuel the engine computer feeds to the engine. But, on an engine
that uses a mass-air meter, the air that is displaced by injecting the nitrous, lowers the airflow seen by the mass-
air meter. This causes the engine’s computer to reduce the engine’s fuel injector flow rate. To compensate for
