Adding nitrous to the already potent Nissan Skyline GT-R may seem like overkill to many. Where we come from if there is a way you can make more power you take it. Our test subject has an enviable racing history. It was modified for Pike's Peak competition and was the Showroom Class winner in 1999. After Pike's Peak, Sean Morris of MotoRex had the motor "tweaked" to where it was putting out around 444 horsepower at the rear wheels. He intends to have this car set up to compete in import drag racing. We decided to follow the installation of a Nitrous Oxide Systems kit on this car to better illustrate the installation steps touched on in the preceding Basic Tech article.
The installation was performed at the So-Cal Speed Shop in Pomona, Calif., builders of world-famous street rods, custom cars, strip cars, track cars, lakes cars and custom engines.
The NOS Sportsman Fogger' kit, P/N 05040-FINOS, contains all the hardware necessary for an inline fuel injected, six cylinder engine. It's a wet-manifold system, meaning that it injects both fuel and nitrous through its nozzles. Included are all hoses, lines, nozzles, distribution blocks, solenoids, filters, connectors and switches that are necessary for installation. The NOS Sportsman Fogger' kit comes standard with a 10 lb. nitrous bottle. This standard bottle was used in the installation. Kits can, however, be ordered with either a 15 lb. or a 20 lb. nitrous bottle. These larger bottle sizes can be specified by adding a suffix to the part number, "-15NOS" or "-20NOS", for 15 lb. or 20 lb., respectively.
1. To begin, the location and orientation of the NOS nitrous bottle had to be determined. It was decided that the trunk would provide the best location, but the bottle had to be mounted so that the siphon tube would be at the back of the bottle. This is necessary because the liquid N2O will be forced to the back of the bottle during vehicle acceleration. When installed, the bottle should have its valve handle pointed toward the front of the vehicle, with the NOS bottle label facing up. The bottle bracket was secured using 5/16" or No. 12 sheetmetal screws.
2. Next, the main nitrous feed line was installed from the trunk to the engine bay. It's easiest to route this line following either the main fuel line or the brake lines under the vehicle. One-half inch Tinnerman clamps or nylon tie-wraps could be used to securely support the nitrous line. A hole must be drilled through the trunk, under the vehicle, to gain access to the nitrous bottle. At this point, it's a good idea to disconnect the Negative ground terminal from the battery to avoid any unpleasant surprises.