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NXS Manual Boost Controller Installation Install Guide

nxsmotorsports
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NXS Motorsports Manual Boost Controller Installation and Setup Instructions

This guide was designed to help our customers install our boost controllers. It's quite easy to do this. Those with little or no experience can have their unit installed in 30 minutes or less. All you need are two basic tools:

  • Pliers
  • Scissors or a knife (or something sharp to cut vacuum hose)

That's it. Once you have your boost controller, these tools, and some vacuum hose, you're ready to get started.

Precautions:

1) Never increase your boost without the available fuel supply to support it. Please read the FAQ for details on monitoring your progress.

2) The controller is shipped at a low boost setting to protect your engine. Follow the instructions below to adjust it. Do not adjust the controller before installing it.

3) When adjusting the controller, make small adjustments at first. The controller is sensitive and half a turn can create a gain of up to 1 pound of boost. Make sure you tighten the lock nut after adjusting the boost controller.

4) Note that the controller has a very small vent hole on the side of the elbow directly across from the wastegate nipple. This orifice must not be blocked if the controller is to operate correctly.

Let's get Started:

1) Locate the wastegate on your turbo system. Most will have an internal design like the one in the illustration. Attached to the wastegate will be a vacuum line or hose. Remove the hose from the wastegate and seal it. A large, short, sheet metal screw works well for this purpose and will not work itself loose. DO NOT DRIVE THE VEHICLE WITH THE WASTEGATE DISCONNECTED. If you have an adjustable wastegate, set it to its lowest boost setting. Most factory wastegates are not adjustable. You'd know if you had one.

2) Attach a length of vacuum hose from the wastegate barb of the controller to the nipple on the wastegate. This is the nipple that you just removed the vacuum hose from. Zip-tie it in place so that it won't fall off. Also, be sure to secure any hoses or fittings that you may have added.

3) Locate a boost source using the diagrams as a guideline. Now, connect a piece of vacuum hose between the boost source and the straight end of the controller. A drop of oil on the brass tip will aid in adjusting the hose later. Do not use the original wastegate line as your boost source. The best point to use for a pressure source is the nipple on the turbocharger. If there is already a line attached, install a vacuum tee (as close to the nipple as possible) and splice into the connection. Alternate sources include the intake manifold or the pipe between the turbo and throttle. Do not zip-tie this hose yet. You may need to adjust these hoses later.

4) Check all connections to ensure that they are snug and will remain connected during testing. Now, start the vehicle and drive moderately for a few minutes. Notice the boost level while you drive. If you have followed the instructions, you will now have a peak boost that is the same or lower than the stock boost setting. If this is true, then proceed to step 5. If the boost is now higher, check your connections before adjusting the boost controller. If the boost remains higher than stock, gently accelerate in a higher gear and watch the boost. If the boost level exceeds your target limit, release the accelerator immediately and adjust the boost controller as follows. Loosen the lock nut and rotate the adjustment screw counter-clockwise (makes the controller longer) relative to the rest of the controller, one turn. Hold the opposite end of the controller while doing so. Re-tighten the lock nut and repeat step 4. If you have to lengthen the controller further, use care so that the screw and housing remain connected, or the ball and spring may fall out. If they do, please refer to the pictures. They will show you the correct order of the parts.

5) If you are at this step, then the boost is currently at a stock or lower threshold. Loosen the lock nut and turn the adjustment screw clock wise, relative to the intake source barb (makes the controller shorter), 1/4 turn. Re-tighten the lock nut. Accelerate again in a higher gear and note the new boost setting. Repeat until you have reached your target boost level. Note: it may take a few turns before you begin to see a change. Be patient, do it a quarter turn at a time to avoid over boosting. It only takes twenty minutes or so to complete the adjustment.

6) When your adjustment is completed, zip-tie all connections and tighten the lock nut.

7) Use caution when driving your newly adjusted vehicle. Control problems may appear during rapid acceleration that were not apparent at the stock boost level.

 

Here are a few ways you can install your boost controller:

These diagrams were part of our original guide. They're definitely still relevant and we keep them available for those who need them.


Modifying the Controller:

The NXS Motorsports Manual Boost Controller will support boost levels in excess of 30 psi, but should you find that you cannot reach your desired boost level, the boost controller may be modified by slightly stretching the spring to increase the pressure placed on the ball.

Problems:

The boost overshoots its target level before settling to a lower level.

This is called spiking. Ensure that you have provided the shortest path possible between the boost source and the boost controller. Also check the path between the boost controller and the wastegate.

The manual boost controller worked great at first, but now my boost level is reduced each time I step on the throttle.

Check the vent hole on the elbow end of the boost controller for obstruction. Use the illustrations to find it and make sure the hole is clear by inserting a very slender pin or needle.

The NXS Motorsports Manual Boost Controller FAQ

Can I use the Manual Boost Controller with my performance chip?

Yes, although the gains will probably be of a lower magnitude than those of unmodified cars. This is because many chip manufacturers have already set the boost to a higher setting. Additional gains can be found by using the NXS Manual Boost Controller if the chip manufacturer allows the boost signal to reach the wastegate before peak boost is achieved. This is usually the case, as the factory boost controller cannot respond fast enough to control spiking.

Will you back up my factory warranty should I damage my engine?

Unfortunately, carelessly increasing the boost without monitoring air/fuel ratios or exhaust temperature may damage your engine. It is not possible for us to accept responsibility for your actions should damage occur. However, there are many good exhaust temperature and air/fuel gauges available, to monitor your progress. Check the values at WOT at stock boost levels and then slowly increase the boost. When you notice a drop in O2 sensor voltage, or a rapid increase in EGT, you have reached the limits of your computer's capabilities. You will need to add more fuel. There are too many ways to do this to cover here. This same risk is present with an electronic controller or a chip. As those companies must limit their responsibility, so must we. We will replace the manual boost controller with an identical one, should a defect in workmanship be discovered. One benefit of the NXS Manual Boost Controller is that it is easily removed should you decide to revert your vehicle back to stock specifications.

How high can I raise the boost?

Provided you have the fuel to accommodate the extra boost, the NXS Manual Boost Controller will allow you to raise the boost limit to over 20psi. Actual limits of the controller are dependent on variables, which include turbo size and wastegate actuator parameters. The included instructions describe methods to modify the controller, should you find that you are unable to reach your target boost with the stock controller configuration. Also, keep in mind that some turbo systems will cut fuel delivery above a preset factory limit.

Note: Although most factory turbo systems will easily accept boost increases of 20-30%, air/fuel mixtures should be monitored when raising boost above factory limits. This applies to any boost controller. It is a good idea to use one of the gauges mentioned above and raise the boost slowly.

 
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