EVO/VF 470 HP Supercharger Fitted to the 2005 997

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EVO/VF 470 HP Supercharger Fitted to the 2005 997

www.evoms.com, Sept 2005

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supercharger system for the NEW 2005 Porsche 997/S. There are several fundamental designs of superchargers. When retro fitting a supercharger, an important factor is the natural

Tempe, AZ Evolution MotorSports and the collaborated effort with VF-Engineering and GIAC bring you the worlds FIRST and finest “OEM quality” supercharger system for the NEW 2005 Porsche 997 or Porsche 997S. Countless man-hours have been spent designing, tuning and manufacturing this remarkable supercharger system. The painstaking efforts are evident in the precision engineered / CNC machined supercharger components, the detailed roto-molded porsche 997 engine duct design and the seamless power curve throughout the RPM range. Our attention to detail and quest for perfection are carried through to every aspect of this system. “Beyond Performance”

What is supercharging ?

Supercharging is also known as forced induction. When a porsche engine is normally aspirated (draws in air without assistance) it relies on atmospheric pressure (at sea level approx 14.7 pounds or 1 bar) to push the air into the engine manifold (running under vacuum) and into the combustion chambers (cylinders). Due to internal restrictions along the air path, the Porsche's normally aspirated cylinder is never able to completely draw in a full charge of air/fuel mix. In general a supercharger is anything that will force more air, or air/fuel mixture, into the cylinders of an engine at a faster rate than would be drawn naturally by the suction of the pistons during the intake stroke (putting the porsche engine into positive pressure). This process is used to increase power and torque of a porsche 997 engine.

Types of supercharger ?

There are several fundamental designs of superchargers (roots, screw, vane, rotary, axial flow and centrifugal). Each design has its advantages and each are differently suited to different types of application. The most commonly used today for aftermarket supercharger kits are the roots and centrifugal. The roots supercharger units, ideally need to be mounted on the plenum chamber but the centrifugal type is not restricted in this way. However all supercharger units need to be mounted to take a drive from the porsche engine crank pulley by a serpentine belt.

Parameters of supercharging ?

Porsche Performance modifications /customization are termed as 'Aftermarket' or 'Retro-fitting' or 'tuning'. When retro fitting a porsche with a supercharger, an important factor is the natural compression ratio of a porsche engine. Supercharging a porsche 997 as an aftermarket technique is typically setup to create a 40% power increase. More power can be produced if the compression ratio is suitable. EVO's porsche supercharger engineerd kits produce a modest 5-6 lbs of boost. Subject to long term testing on all porsche prototype cars, this is considered to be a safe level for the stock porsche engine. To increase reliability, an air to water intercooler is used to reduce air intake temperatures.

Why supercharge ?

Compressed air contains a greater amount of oxygen molecules which improves the fuel combustion cycle. However this requires that the fuel mixture and ignition cycles be altered / increased to suit the increased volume of oxygen. Retro-fitting a porsche 997 with a supercharger usually provides a much larger power gain compared to other porsche aftermarket modifications such as capacity increasing which is also expensive. Supercharging with a centrifugal supercharger is less obtrusive to the vehicle and reversibility is simple to incorporate into its design.

Fuel Efficiency

A centrifugally supercharged porsche engine will operate under vacuum until the Porsche ECU determines the motor is at wide open throttle (full throttle). At this point the engine goes into positive pressure (onto boost). Up to this point the fuel consumption is not affected. When driving hard and on full throttle the porsche supercharged engine will be creating more power and hence using a greater amount of fuel. Fuel consumption usually increases in the region of about 10% depending upon how often you drive under boost and the type of supercharger you have fitted to your Porsche 997.

EVOMS Porsche 997 Supercharger

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