Installation guide for the Pacific Performance Engineering (PPE) boost controller. The guide explains how to locate and connect to the turbo sensor, including the two access methods for 2004-2005 models, and walks through wiring and setup for precise boost control.

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The boost controller connects in-line between the factory wiring harness and the turbo (boost) sensor. The first step on every application is to locate that sensor. The access procedure depends on the model year of your Duramax-equipped truck.

Locating the Turbo Sensor (2004–2005 Models)

On 2004–2005 trucks there are two ways to reach the turbo sensor. Use whichever method gives you the easiest access.

Method 1 — Behind the A/C Compressor

1. Remove the fan belt.
2. Remove the 4 bolts from the A/C compressor, but do not remove the A/C pressurized line bolts.
3. Lift the A/C compressor off and rest it on the left side of the engine.
4. The sensor is directly behind the A/C compressor, under the rigid coolant pipe, and should be easy to access.
5. Unplug the factory harness from the sensor and connect the boost controller in between the harness and the sensor.

Method 2 — In Front of the Air Intake Tube & Turbo

1. Remove the air intake tube from the air cleaner box and turbo: loosen the clamp at the turbo inlet and remove the intake air tube.
2. Access to the sensor will be under the rigid coolant pipe.
3. Unplug the factory harness from the sensor and connect the boost controller in between the harness and the sensor.

Locating the Turbo Sensor (2006–2007 Models)

On 2006–2007 trucks the turbo sensor is easily accessible with no need to remove any parts. Unplug the factory harness from the sensor and connect the boost controller in between the harness and the sensor.

Mounting the Module & Control Knob

• Position the module next to the front side of the battery and strap it in place as necessary. This is the best location to keep the module as cool as possible.
• Pass the white 4-pin connector through the firewall rubber grommet into the cab.
• Locate and mount the switch / control knob in a convenient location.
• Boost can be adjusted while driving by simply turning the dial: clockwise to increase boost, counter-clockwise to return to the factory boost settings.

Boost Settings & Tuning

• When running a Hot tune, maximum horsepower is attained at 30–32 PSI, measured with a mechanical boost gauge after the intercooler. The best spot to install the boost gauge is in the cast aluminum intake tube on the engine.
• When running stock or tow programs, maximum boost pressure should be adjusted to around 25–28 PSI for maximum horsepower. Horsepower will be lost above 28 PSI.

Using the Switch

Identifying the OFF Position

• Toggle Switch: the lever flipped opposite to the groove on the shaft is in the OFF position.
• Optional Rocker Switch: the switch flipped toward “0” is in the OFF position.

When the Switch is in the OFF Position

Allows for an increased, dialed-in amount of boost during the entire boost range. This setting is good for power-brake launches, economy while running Hot Tunes, and cleaning up smoke at all throttle positions.

When the Switch is in the ON Position

Allows for maximum low-boost fuel and an increased, dialed-in amount of boost only once factory boost has reached over 18 PSI. This setting is good for non-power-brake launches and economy while running stock or tow tunes.

LLY / LBZ Boost Controller Notes

• With the hottest tunes, the optimal performance position for the boost-increase control knob is around the 11 o’clock position.
• With standard tunes, the optimal performance position for the boost-increase control knob is around the 9 o’clock position.