Wizards of Nos - Static Tuning Test Procedure

Caution: The test should only be applied to Wizards of Nos (Highpower) nitrous systems. Carrying out this test on other systems (NX, NOS, Nytrex) may result in engine damage.

Note: On power gains above 25hp, a road test/plug inspection should be completed in addition to the static test.

This static test procedure is a standard tuning test for establishing correct mixture setting of Wizards of Nos nitrous systems. This test must only be done with the base 25hp jet setting and should be repeated after the installation of an optional bottle warmer and/or modifications to the fuel delivery system.

On completion of this test, a jet ratio will be established that should be applied to determine appropriate jet sizes when jet changes are made for higher power gains (see mixture ratio table below for examples).

Customer support from the Wizards or your local agent is available.

Static Test Procedure

Caution: Only use this static test procedure on Wizards of Nos (Highpower) nitrous systems with the 25hp jetting. Using this test on other manufacturers nitrous systems could result in engine damage.

Note: Some turbo engines, some race/tuned engines and the occasional naturally aspirated engines do not respond as expected to the static test. This is often due to engine management factors that alter the air/fuel mixture and/or the ignition timing which alters the static test results. In these cases, the road test method should be used.

1.   Run the engine to normal operating temperature with at least one instance of cooling fan operation.
2.   Open the nitrous bottle valve.
3.   Move the nitrous system 'Arm' switch to the 'ON' position.
4.   If a progressive controller is installed, set the 'Start Power' to 50% and the 'Build up Time' to 2.0 seconds (For further information, refer to the controller operating instructions).
5.   Caution: If the engine sounds in any way different (harsh or rattles) to the way it sounds when you rev the engine normally, or if the engine revs rise above the engine redline limit, cease testing and report to our technicians.

Caution: Do not release the accelerator while the nitrous system is activated manually using the throttle microswitch/throttle position sensor (TPS).

Note: Assistance may be required (to operate the accelerator, monitor the engine rpm gauge and to check for exhaust gas colour change) while the nitrous system is activated manually using throttle microswitch/TPS from under the bonnet.

Hold the engine revs at one third of the total rev range (i.e. if redline is at 6000rpm, hold at 2000rpm) and activate the nitrous system manually, by holding the throttle mounted microswitch/TPS. Monitor the engine revs and exhaust emission (if possible) for the following correct response:
  • The engine revs should rise sharply (as if the throttle had been applied) to just below the redline limit and remain there until the microswitch is released, while the exhaust should emit blacker than normal smoke which indicates a rich mixture of a correct fuel/nitrous ratio.
  • 6.   Release the nitrous system throttle microswitch/TPS (the engine revs should return to the held rpm).
    7.   Release the accelerator.
    8.   If during step 5 the engine revs rise briefly but drop again or only rise a few hundred rpm higher, then the mixture may be too fuel rich. Reducing the fuel mixture can be done by changing to a smaller fuel jet or installing a fuel pressure regulator to reduce the fuel pressure.
  • When the mixture ratio is changed, repeat the static test procedure until the correct results are achieved
  • 9.   If during step 5 the engine revs rise very sharply to above the engine redline limit, then the mixture may be too fuel weak. Increasing the fuel mixture can be done by changing to a larger fuel jet or installing a higher flow rate fuel pump.
  • When the mixture ratio is changed, repeat the static test procedure until the correct results are achieved
  • 10.   If a progressive controller is installed, adjust the 'Start Power' and the 'Build up Time' settings to the desired level for road or track use.

    Road Test Procedure

    A road test should be completed after a successful static test on power gains above 25hp or on vehicles which do not respond well to the static test.

    For power increase of 50hp and above, NGK Iridium tip spark plugs are recommended of one grade colder and a further one grade colder for every 50hp increment. As with any engine tuning, a good quality engine oil is advisable.

    Warning: Ensure the steering lock mechanism does not engage when turning off the engine.

    Note: The Wizards of Nos do not condone speeding on the public highway. A road test should be completed on a suitable road or test track where stopping/inspection is acceptable. Consideration must be given to other road/track users at all times.

    1.   Using an appropriate gear (E.G. 3rd gear) starting from approximately 2000rpm, accelerate at full throttle (nitrous system 'Arm' switch in the 'OFF' position) from approximately 30mph up to 70mph then:
  • release the throttle
  • depress the clutch
  • turn off the engine
  • Coast the vehicle to a safe stopping place.
  • 2.   Remove the spark plugs for inspection and note the colour.
    The firing-end appearances below is considered normal.

    Caution: If you hear any noises other than a louder exhaust note or you feel anything other than a smooth surge of power, cease the test and contact our technicians.

    3.   Repeat step 2 with the nitrous system 'Arm' switch in the 'ON' position. You should experience smooth, stronger acceleration.
    4.    Remove the spark plugs for inspection and compare the spark plug colour with the colour noted during the non-Nitrous run. The plugs should be the same colour or a slightly darker colour when on nitrous indicating a correct or slightly rich fuel mixture. For further information visit NGK Technical guide or consult our technicians.

    Mixture Ratio Table

    HP SettingNČO JetFuel JetNČO:Fuel ratio
    25 (normal)50 20 2.5:1
    25 (Fuel weak) 50 15 3.33:1
    25 (Fuel rich) 50 25 2:1
    50 (normal)100 40 2.5:1
    50 (Fuel weak) 100 30 3.33:1
    50 (Fuel rich) 100 50 2:1

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    This information is provided by Streetcar Nitrous Tuning Solutions Ltd. and concurred by the Wizards of Nos. 20th July 2005