Nitrous Oxide

I decided to write this app because I couldnt find anything web based at the time that would do this. Most of the info out on the internet required you to have a calculator or do the calculations in an Excel doc.

If you have a Palm PC running PalmOS 3.5 or later, or want to have a version that runs on your Laptop/Desktop PC,CLICK HERE.

Wanna see the car that I have the Nitrous Oxide installed on? It is my1991 Geo Storm. Yea, yea. . .you say that now, but Ill still smoke you. Checkout my Storm project and the modifications I have done!

Until next time; Get in, sit down, shut up, and hang on when I push the fun button!

The Nitrous Jet Calculator will help you calculate Horse Power ratings for jets used in nitrous oxide systems. If you are using a wet setup, you can calculate what the Fuel Jet size is by filling out the nitrous pressure and fuel pressure fields for a given Nitrous Jet.

Dont forget the excessivespeedscan get you in trouble. If youre unlucky enough to get pulled over you may want to hire aCincinnati criminal lawyerto defend you incourt.

To see the other downloadable versions of the Nitrous Jet calculator for the Palm and your computer,CLICK HERE

Nitrous Jet Size:Thousandths of an inch.

Number of Jets/ports:123 Geo Metro Rocks!45 Saab? Audi?6 You scare me!8 You really scare me!10 Viper is cool!12 Can I have a ride?16 Can I drive?

The Fuel jet size should be0.000or0.000mm

A Nitrous jet size of[NJ]ormmshould produce:

Air/Fuel RatioWhat constitutes correct A/F ratio?

Most recommend running slightly rich (generally, between 11.5-12.5:1), but agreement on this point is by no means universal, and some sources recommend going even richer under some circumstances.

At 250 hp and under, you can run the same as the engines air/fuel ratio. But at 450-500 hp run 11.5:1 as a safety factor.

Try adjusting the exact air/fuel ratio according to engine displacement. A 400hp kit delivers about the same 400hp boost on a 400ci engine as it does on a 600ci engine, but because the larger engine has much more total cylinder volume, the mass fraction of nitrous inducted into that engine as a proportion of that volume is less, so it is more easily absorbed.

The big engine may be happy with an 11.5:1 A/F ratio, but you may have to go as rich as 10:1 on the smaller motor. Finding the exact A/F ratio to run can be somewhat tricky because nitrous carries its own oxygen. The ratio in effect becomes a variable of how much nitrous you put into the engine.

The following equation to work well as a starting point:

Target A/F Ratio = [(engine hp / total hp) x 13] + [(nitrous hp / total hp) x 7]

Actual A/F ratio tuning is accomplished with either a wideband O2 sensor, or by reading the spark plugs. Usually a light tan porcelain color on the plug is an indicator of the right timing. You need to read all of the plugs. If tuning with a wideband O2, the higher the ratio of nitrous power to engine power, the less accurate the O2 sensor will be. Thats why most hard-core guys look at the plugs and exhaust-gas temperatures. The plugs wont lie to you.

Bottle Temp to Bottle Pressure ratio

Raising nitrous-bottle pressure makes the system hit harder off the line at the expense of inconsistent taper-off on top. To avoid problems, most experts advocate sticking to the system manufacturers recommended bottle operating pressures. Although this can vary slightly among different manufacturers, its usually 900-1,000 psi. The higher the bottle pressure, the greater the drop-off. If you start out at 950 psi, youll finish at 750; if you start out at 1,100, youll finish at 600. The larger the bottle, the less the drop-off. Whatever pressure you run, it should always be consistent, because it affects the rest of the tune-up. There is a direct correlation between bottle temperature and the bottles internal pressure, so keeping the bottle at a specified temperature will also maintain the desired pressure. For example, if you maintain the bottle at 90-92 degrees F, there will be about 950 psi at the start of the run. The pressure will drop during the run, but you should still have 880-900 out the back. Depending on local climate conditions, this may require a bottle blanket and electric heating device for warming the bottle, or a cold towel and ice to cool it.


The following is intended as a safe baseline for fogger systems. There are two fuel jet columns listed below. One column for fuel jet size with the fuel pump that comes in the kits and the other column for hi-output pumps like the Holley Blue with 5-7 psi flowing pressure. The nitrous jet chart is based on bottle pressure of 900-950 psi. Ignition timing should as a baseline be retarded to 1/5 to 2 degrees for every 50 h.p. worth of nitrous hp used. Ignition timing should be retarded from the best timing on motor only. (The point at which best MPH or Torque was achieved.)

This is just a guideline, there are many variables such as nozzle type and distribution block type that will change

your particular set-up. Consult your engine builder for fine tuning tips.


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