Supercharging

Supercharging your Mustang

OK. To start with, there are three methods of supercharging. Centrifugal, Roots and twin screw.

The main difference is how they move air to the intake manifold of the engine. Roots and twin-screw superchargers are very similar using different types of meshing lobes, and a centrifugal supercharger uses an impeller, which draws air in, very similar to a turbo.  Although all of these designs provide a boost, they differ considerably in their efficiency

Centrifugal look like a turbo unit and build boost in parallel to the rpm, that the engine is making. So max boost will only occur at max rpm of engine.

Roots and twin screw types, produce the said max boost at the hit of the accelerator pedal. So if it has 10 psi, then it will produce 10 psi at 1500 rpm and all the way through the acceleration curve.

This means that the Roots and Twin screw will feel more powerful at lower rpm.

To pressurize the air, a supercharger must spin rapidly — more rapidly than the engine itself.  Making the gear smaller on the supercharger increases the spin rate and thus increases the boost level.  Superchargers can spin at speeds as high as 65,000 rotations per minute (RPM).

Atmospheric pressure at sea level is 14.7 psi, which is classified as a “bar” so a typical boost from a supercharger places about 50 percent more air into the engine, than a normally aspirated engine. With the extra air, you can now add the extra fuel, and so create the extra power.

As the air is compressed, it gets hotter, which means that it loses its density and can not expand as much during the explosion. This means that it can’t create as much power when it’s ignited by the spark plug. For a supercharger to work at peak efficiency, the compressed air exiting the discharge unit must be cooled before it enters the intake manifold. The intercooler is responsible for this cooling process. Intercoolers come in two basic designs: air-to-air intercoolers and air-to-water intercoolers. Both work just like a radiator, with cooler air or water sent through a system of pipes or tubes. As the hot air exiting the supercharger encounters the cooler pipes, it also cools down. The reduction in air temperature increases the density of the air, which makes for a denser charge entering the combustion chamber.

Examples of centrifugal type. – Procharger, Vortec, Paxton.

Examples of Twin screw / roots type. – Roush TVS, Whipple, Edelbrock, Saleen,

After all that, we do have our favourites, but we can fit which ever you prefer.  Please call for pricing as these obviously alter with each  unit and hp level.

Brenspeed supply our tunes which we have been more than happy with over the last few years. Take a look at THIS example of a twin screw.

We work with the best so that we can stay the best.

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Roush TVS

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Procharger

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Whipple