From Honda press: The Honda S2000 is a high-performance, 2-seat, open-topped roadster with an advanced front-engine, rear-wheel-drive sports car configuration. Introduced in 2000 as a commemoration of Honda's 50th anniversary, the S2000 incorporates many of the lessons learned in the company's five decades of building and racing cars and motorcycles. Its original concept was to be a true sports car that could serve as both a practical and fun daily driver and a highly capable weekend track racer.
For its 2004 redesign, Honda engineers built on those ideals and elevated the S2000 to a higher class by strengthening the all-around performance, enhancing the interior and giving the exterior a subtly bolder appearance. The net gain is an S2000 that is simultaneously an improved track car and an improved daily driver.
On the track, the 2004 S2000 accelerates with increased authority and more pull through corners with a broadened powerband that comes on sooner and stronger. The new suspension tuning enhances vehicle control qualities at the limit, while minimizing bump steer effects from road disturbances. Larger 17-inch wheels and tires provide more grip and maximize the suspension tuning.
he S2000 powertrain uses a front-engine/rear-wheel-drive layout. The longitudinally mounted engine is mated to a 6-speed, close-ratio manual transmission. A propeller shaft carries the output of the transmission to a frame-mounted limited-slip differential. The differential drives the rear wheels via separate axle shafts.
The 2.2-liter, aluminum-alloy, inline 4-cylinder S2000 engine produces 240 hp @ 7800 rpm and 162 lb.-ft. of torque @ 6500 rpm. The cylinder head is also made of aluminum alloy and features dual overhead camshafts, 4 valves per cylinder and VTEC (Honda's variable valve-timing system) on both the intake and exhaust valves. Fuel induction is via Honda's sequential, Multi-Point Programmed Fuel Injection (PGM-FI) and the ignition system is a high-voltage, computer-controlled direct type with individual spark coils for each cylinder. The engine's exhaust emissions qualify the S2000 as a Low-Emission Vehicle (LEV) in California.
Objectives for enhancing the 2004 S2000 powertrain focus on improved power delivery at low and mid-range rpms while maintaining the high-revving, race bred nature of the S2000 engine.
Between 1000 rpm and 8000 rpm, available torque and horsepower increase between 4 and 10 percent. Additionally, useful power for high performance acceleration begins at about 3000 rpm compared to about 6000 rpm on the 2000 - 2003 models. The performance improvement at lower rpm ranges can be attributed to the increase in displacement and revised valvetrain tuning. Lower gear ratios on gears one through four further magnify the new performance characteristics of the engine.
The enhanced powerband benefits acceleration response at lower rpms and improves the overall "powerful feel" of the car in everyday driving. To increase the engine displacement, powerband, and direct transmission feel of the vehicle, the following specifications and components have changed: