Cold plugs are typically used in racing conditions because of its ability to transfer heat out of the cylinder chamber quickly. Most turbo, supercharged and nitrous oxide applications use this type of plug because of the tremendous heat they generate. A colder plug can also minimize the risk of pre-ignition and detonation, however if the plug is too cold there is risk of fouling during extended periods of idling and low-speed operation.

The lower the number, the hotter the plug; the higher the number, the colder the spark plug.




Importance of the Fuel Pump


As we said before, if you run lean, you can destroy your engine in a matter of seconds. No more than an additional 20 horsepower per cylinder be used on a stock engine, with a stock fuel pump.

Nitrous kits are designed to work as a bolt-on kit for stock or mildly modified vehicles. Mildly modified vehicles would include header upgrades, exhaust upgrades, air filter kits, etc.

If major engine modifications have been performed, a fuel pump upgrade will be required for safe nitrous system operation. Major engine modifications would include turbochargers, superchargers, aftermarket cylinder heads, head porting, camshafts, intake manifolds, etc. Failure to upgrade the fuel system when using nitrous in these highly modified applications may cause serious lean conditions that can result in severe engine damage.

So bear in mind that a high-flow performance fuel pump is needed on heavily loaded systems. You can also monitor if you run lean or rich by installing gauges.




Adjusting the Power Level by JETs - preventing detonation

Nitrous kits are designed for multiple power levels. These levels are controlled by metering jets installed in the nozzle`s fuel and nitrous jet fittings. To change the power output, all you need to do is install the appropriate set of jets. Jet sizes are measured in thousandths of an inch. So a "35 jet" is a jet with a hole drilled 0.035" through it.

Always start conservative. Follow recommended jet combinations and start with the lowest level. It only takes a few moments to change the jets so don`t take unnecessary risks by starting at the highest level.


When problems with misfire or detonation are encountered, ALWAYS reduce the size of the `nitrous jet` first! Remember that the power comes from the fuel, not the nitrous, so trying to cool things down by adding fuel simply adds more power and complicates the problem.

Increasing a nitrous jet size will make the system run more lean, increasing the fuel jet size will make the system run more rich.




Activating the System while hitting the Rev Limiter

Don`t activate or have the system activated when you hit the stock rev limiter. The stock rev limiter is a fuel cutoff. If you cut fuel while you`re injecting nitrous, you`re instantly very lean. This momentary lean condition has the potential of causing internal engine damage and intake backfires.

One way to keep your nitrous engine safe is to install a MSD Ignition RPM Activated Switch. The switch can be adjusted to turn your nitrous off at a selected rpm before the engine hits the rev limiter.




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