However, the internal components for the American versions were based largely on the specifications for the Japanese Lancer Evolution VII. The Lancer Evolution VIII was also the first Evolution to come to the United States, spurred by the success of the Subaru Impreza WRX which had been released there just three years prior. This was the only model year to use the CN9A as its frame. This new generation was slightly heavier than previous Evos - the GSR in particular due to the added technology systems- but to counter this the car produced even more power - the Weight of the RS being 2750 lbs and the GSR being 2976 lbs. The Evo IV can be distinguished by its two large foglights on the front bumper, and the newly designed tail lights on the rear, which became a standard design to Evo VI, which would become yet another trademark of the Evolution series. Mitsubishi's new Active YAW control appeared as a factory option on the GSR model, which used steering, throttle input sensors and G sensors to computer-hydraulically controlled torque split individually to the rear wheels and as a result the 10,000 Evo IVs produced all sold quickly. The RS also had factory thinner body panels and thinner glass! The GSR and the RS shared a new twin scroll turbocharger which helped to increase power to 280 PS (276 hp/206 kW) at 6500 rpm and 260 ft The RS also had wind up windows, no air conditioning-just heater, and a few extra brace bars to strengthen the chassis, one behind the front grill and the other across the boot floor. It also came with GLX seats and 16" steel wheels as these were items that would be replaced by anyone entering the car into competition events. The RS version was produced as a competition car with a limited-slip front differential and a friction type LSD at the rear. There were 2 versions available, The RS and GSR. The engine and transaxle was rotated 180° to better balance the weight and eliminate torque steer. The Lancer platform was completely changed in 1996, and along with it the Evo, which had become extremely popular throughout the world. Interior tweaks were limited to a new Momo steering wheel (GSR only) and new fabric on the Evo 2 type Recaros. Both GSR and RS still used the same 5speed gearbox. Under the vented aluminium bonnet a new TDO5-16G6-7 Turbo, new exhaust system and increased compression brought another 10 bhp power rise, Torque output was unaltered, apart from a higher final drive ratio. New side skirts and rear corners, while the rear wing had grown again to reduce lift. The Evo 3 looked more serious, with it's new nose moulding (to channel air better to the radiator, intercooler, and brakes). It arrived in January 1995 and this time the 5000 strong production run was brought up more quickly than the Evo 2. A larger rear wing, a front airdam with brake cooling vents, and rocker panel extensions were fitted and, you guessed it, power was up again.
Speeds on tarmac stages were getting higher, so reducing lift and improving cooling performance became priorities in Evolution III. Unfortunately, the Evo has also been evolving into a heavier and heavier vehicle with each generation in face of tougher worldwide safety and emission regulations. For instance, the flywheel on normal cars weighs about 12-15 kilograms but the Lancer flywheel weighs a mere 6 kilos for very quick engine response.
Even standard components are considered "tuned" compared to other vehicles. Japanese-spec cars were limited by a gentleman's agreement to advertise no more than 280 PS (276 hp), a mark already reached by the time of Evo IV however, each generation of Evo's power has clandestinely evolved above the advertised number, with the Japan-spec Evo IX having real output of about 320 PS, and various versions available in other markets, particularly the UK, have official power outputs up to 405 bhp (302 kW). Variable valve timing is an Evolution first in 2006, coming in the form of MIVEC (Mitsubishi Innovative Valve-timing-and-lift Electronic Control). The current 2006 Evolution (US market) includes a turbocharged 286 hp (213 kW) inline four-cylinder engine and a full-time all wheel drive powertrain.
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