How To Adjust the Boost on a Supercharger

To adjust the boost on a TTS supercharger, you typically change the size of the supercharger's pulley; a smaller pulley increases boost by spinning the supercharger faster, while a larger pulley decreases it. For some TTS systems, adjustments may be made through a variable boost control dial or by changing the size of the crank pulley instead of the supercharger's pulley.

Pulley size adjustment

Smaller supercharger pulley: Installing a smaller pulley on the supercharger will increase boost pressure because the supercharger will spin faster for every rotation of the engine's crankshaft.

Larger supercharger pulley: A larger pulley will decrease boost pressure, as it spins slower for each engine crankshaft rotation.

Changing the crank pulley: An alternative to changing the supercharger pulley is to swap the crank pulley. A larger crank pulley will also increase boost, while a smaller one will decrease it. However, this method can affect other components driven by the crank pulley, so it requires careful consideration.

Boost Sensor for Supercharger

A boost sensor is often included in a TTS supercharger kit, or is a necessary component for its installation to monitor and control boost pressure. The sensor is crucial for the engine's control system and may be a part of the kit to ensure proper performance and engine safety.

Function: A boost pressure sensor measures the pressure in the engine's intake manifold, which is generated by the supercharger. This data is used by the engine's computer to manage the amount of boost being produced, which affects air pressure and fuel delivery.

Necessity: While the supercharger itself provides the boost, a sensor is needed to make sure it doesn't exceed safe limits and to fine-tune the engine's performance.

Kit contents: Check the specific TTS supercharger kit for the vehicle you have, as the sensor and other necessary components (like gauges or other sensors) can vary between applications.

A boost sensor to read the supercharger's output. This is the Manifold Absolute Pressure (MAP) sensor, which is crucial for the engine's computer (ECU or PCM) to monitor and control boost levels for optimal performance and fuel mixture. You can use an aftermarket gauge, such as a P3 gauge, to display this information.

How it works

The MAP sensor is located between the supercharger and the engine, typically in the intercooler or intake pipe.

It measures the pressure of the compressed air coming from the supercharger.

This data is sent to the engine's computer, which uses it to calculate and adjust the air-fuel ratio.

How to see the boost reading

Use a scan tool or OBD-II gauge: A standard OBD-II scan tool or a dedicated boost gauge that connects to the OBD-II port can read the boost pressure from the vehicle's factory MAP sensor.

Install an aftermarket gauge: Many aftermarket gauges, like the P3 gauge, can display boost pressure by reading data directly from the vehicle's sensors or the ECU.

Consider analog or digital inputs: Some gauges offer options for analog inputs, which would require a separate boost pressure sensor to be installed in the intake piping. However, reading from the existing MAP sensor is often the easiest method.