The Variable boost supercharger, jumping into the future of forced induction

Recently, we talked about variable geometry, twin scroll, and other types of turbochargers, which are at the forefront of the innovation when it comes to forced induction.

However, recent innovations in superchargers have brought novel and possibly game changing ideas into the field of forced induction.

Thus the Variable Boost supercharger is created, the concept has been experimented with by various manufacturers, such as ProCharger.

How does this work? And how does it compare with more common forms of forced induction?

Well, the simple answer is quite literally stuffing a Continuously Variable Transmission (CVT) between the Supercharger Pulley and the compressor. In most cases this new concept is being applied in centrifugal superchargers.

This CVT serves to adjust the speed of the compressor wheel relative to the engine RPM, controlling boost with precision, to achieve a fuel efficient and sufficiently strong power curve.

Unlike a regular turbocharger this system would experience virtually zero lag, it also does not require an intercooler, since the compressor is not in contact with the “hot” side of the engine.

Unlike a regular supercharger in which the ratio between compressor speed and engine speed is fixed, in a Variable Boost Supercharger, the ratio can be adjusted to get high boost at low engine Rpm.

The video below illustrates this system and its potential advantages compared to more traditional setups.