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190 E 2.5-16 Evolution I

With the debut of the BMW M3 Sport Evolution, the 190 E’s direct competitor, it became obvious that the 2.5-16V model needed a boost in power in order to achieve better performance than its competitor. In March 1989, the 190 E 2.5-16 Evolution debuted at the Geneva Auto Show. The Evo I, as it came to be called, had a new rear spoiler and wider wheel arches. Many changes were made to under-the-skin components such as brakes and suspension. The car featured an adjustable suspension system allowing the ride height to be adjusted from an interior switch. All were intended to allow the Evolution cars to be even more effective around a track.

The Evo I’s power output is similar to the 202 hp (151 kW; 205 PS) of the “regular” 2.5-16. However, it had a redesigned engine of similar capacity but most importantly, a shorter stroke and bigger bore which would allow for a higher rev limit and improved generation of power. Additional changes stretch to improved rotating mass, improved lubrication system along with improved cam timing.[17] Cosworth also list a project code “WAC” for the development of the short-stroke Evolution engine.[13][16]

Only 502 units of the Evolution model were produced for homologation in compliance with the DTM rules. For those customers desiring even more performance, a PowerPack option engineered by AMG was available for DM 18,000. The PowerPack option included improved camshafts, a larger diameter throttle body, more responsive ignition and fuel management system as well as improved intake and exhaust systems. The net result was an increase in power by 30 hp (22 kW; 30 PS) over the standard car bringing the total to 232 hp (173 kW; 235 PS).

https://en.wikipedia.org/wiki/Mercedes-Benz_W201

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