Developed by Rimmer Engineering
specifically for the Subaru application, these supercharger packages are also unique in
their approach to "real world" performance. Rather than aim for the
highest peak horsepower numbers at elevated engine speeds, the emphasis is on practical
and useable power increases throughout the engines operating range. The Supercharging Systems, as configured in these kits, both provide full boost
pressure from just above idle all the way to peak rpm. The result is a "fat"
torque curve which greatly improves driveability and allows the driver to experience the
benefits of startling performance improvements in everyday use of his vehicle. Unlike a
turbocharger, Rimmer Supercharging Systems have no "lag"
effect; power is immediately available upon demand. At the same time, this enhanced
performance does not extract any penalties in the smoothness, quietness and practicality
of operation of the Subaru. The effect when you step on the throttle is as if a much
larger-displacement engine has been miraculously transplanted into the vehicle.
At the heart of the comprehensive installation
package is the proven Eaton supercharger, an OEM-quality component used as original equipment on
models of Buick, Pontiac, Oldsmobile, Ford, Mercury, Aston Martin, Mercedes and
Jaguar. The Eaton Supercharger is a positive-displacement, modified Roots-type
twisted vane supercharger. It is a vastly improved and modernized development of the
famous traditional GMC blowers used originally on diesel engines and, more visibly, on
blown fuel dragsters. One of the unique features of the Eaton supercharger is
its long, maintenance-free service life. Units typically run 100,000 miles or more without
need for attention.
The companys original top-mount supercharging system requires
a clearance opening for the drive pulley to be cut into the hood of most Subarus; the hole is
then covered with a supplied aerodynamic carbon-fiber fairing. The Forester, having
a taller hoodline, utilizes the top-mount RSS without any need for the clearance opening.
The top mount Subaru RSS with hood fairing will also continue to be
Performance characteristics of the two types of systems are
virtually identical. Both use the same dependable Eaton positive-displacement compressor
as the primary component, and neither require any internal engine work or modifications to
the original factory electronic engine controls or fuel-injection.
The RSS/Eaton Sidewinder requires that the factory
air cleaner assembly be replaced with a supplied high-flow/high-efficiency cone style
filter. Because of increased component costs, the side-mount system is priced slightly
higher than the top-mount, but since no clearance opening is required the system becomes a
true bolt-on installation and the labor associated with the hood modifications is
Horsepower and torque increases with Rimmer
Supercharging Systems are typically 30-40%.
Home Page I Superchargers I Audi I Daewoo
Hyundai I Jeep I Land Rover
I Porsche 944
Subaru I Volkswagen I Rover Engines & T-Cases I About Us
Contact Us I Order
Yours! I News Releases I Project Updates