In this article we will go over how to connect and wire our adjustable boost switch . This is the switch that comes in all of our Stage 1 water methanol injection systems and is used to activate the system. Installing the switch is extremely easy and couldn't e easier. Unlike competitors switches. Our switch is made to handle up to 15 amps eliminating the need for a relay. Making it a simple two wire switch. Thats it. Compare to others and see the difference.

Preparing The Boost Switch

Packaged together in one sealed bag is the boost switch and all its related parts  minus the boost hose which comes packaged separately. When opening this bag be careful not to misplace and lose any of the parts. Begin by first locating the boost switch and apply either Teflon tape or liquid thread sealer to its threads.

Next, locate the 1/8 NPT female nickel plated fitting and screw it on to the switch by hand. Once hand tight use a  pair of wrenches and give one full turn. Do not over tighten the fitting as you can crack the switch. Also, do not apply the wrench to any other part of the boost switch housing other then the hex when tightening the fitting. This can cause damage to the switch.

Mounting The Boost Port Fitting

Next, using the remaining 1/8" male NPT nickel plated fitting as shown in the picture. Using a 11/32" drill bit and 1/8"-27 NPT tap. Drill and tap the desired location for referencing manifold vacuum/boost and mounting the boost port fitting. Begin threading the fitting in by hand. Then snug fit using a 3/8" socket with ratchet.

If you do not prefer to use the push to connect style fittings. You may purchase barb style fittings from your local hardware store and use rubber hose. With high boost applications we have had problems with the rubber hose popping of the barb fitting which is why we use the push to connect style which ensure the hose will not pop off under boost.

Mounting The Boost Switch

Next, choose a location to mount the boost switch. Select a location which is away from the exhaust/heat and is protected from weather and moisture. Included with your switch, but not required, is a metal tool clip. Using a 1/16" drill bit and supplied sheet metal screw. You may use the tool clip/screw to hold and secure your boost switch to a fender or firewall. Also, included are small zip ties for securing the boost switch to existing engine hose's if you desire. 

Connecting The Boost Line

With the switch now mounted. Using the supplied 5ft roll of black nylon tubing provided. Using a sharp razor knife. Measure and cut the hose square on end to the desired length needed. Insert one end of the hose into the boost port fitting located on the engine and the other end into the boost switch fitting. Be sure to route the hose off and away from hot components.

NOTE

For low to moderate boost applications, 1-20 psi. You may use a plastic barbed tee fitting, purchased separately at your local auto parts store, rather then our metal boost port fitting to connect your nylon boost line to manifold pressure using an existing vacuum line on your engine.  When doing so it helps to warm the end of the nylon hose with a match to soften the nylon allowing it to slip over the barb.

Preparing & Mounting LED Activation Light

Included with your boost switch, but not required to use, is a green LED light. If you desire, the LED light may be mounted inside the car, giving you a visual indication when the pump turns on and off. If you choose to use the LED light, before mounting the LED, first prepare the two open wire leads. Using the supplied electrical butt connectors. Strip and crimp a butt connector on the end of each wire lead.

Next, choose a location to mount the LED light. Drill the hole using a ¼" drill bit. Then insert the LED light, feeding the wires through the front of the panel first, then pushing the LED light into place. 

Wiring the Boost Switch

Located on the switch are three electrical terminals. Using one of the supplied female electrical connecters. Connect the top post, labeled COM on the side of the boost switch, to your 12 volt power source as shown in the picture. Included with our systems, but not packaged with the boost switch, is a inline fuse. Install the inline fuse between the boost switch and your 12 volt power source. 

NOTE

Be sure to use a 12 volt ignition switched on power source. This ensure when the vehicle is turned off the system is completely disabled. Do not pull power straight off the battery as the system will remained armed even while the vehicle is turned off.

Next, using the supplied female electrical terminal, connect both your positive red pump wire and red LED wire into the middle post, labeled NO (normally opened) on the side of the switch, as shown in the picture. Use the thin gauge wire supplied with your boost switch for the LED light. Not included with the boost switch but included with our complete water methanol injection systems is 12 gauge wire. Use the 12 gauge wire to connect the pump to the boost switch.

NOTE

The bottom terminal is only to be used for testing and priming the system. This can be done with the engine off and only the ignition on. This is done by temporarily moving the wires from the middle post down to the bottom post. Doing so will turn the pump on allowing you to prime the system manually. Returning the wires back to the middle post when finished.

Last, using the supplied grounding terminals and metal screws provided. Strip and crimp the grounding terminal to the end of the black wire on both the pump and LED light. Ground each wire using the metal screw as shown in the picture. When grounding the terminal make sure to remove any paint to ensure you get a good ground between the terminal and the car's sheet metal.