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Mitsubishi Lancer EvoVII pics

Engine: 4G63

Engine Mods: The Mitsubishi 4G63 engine: These engines went through several mutations over the years but kept their architecture and extreme output unaltered. The 4G63 engine is a long stroke engine (i.e. bore is smaller than stroke) thus favoring torque over high-rev output. Mitsubishi chose to use a relatively high compression ratio, for a turbocharged engine, 8.8:1, and has therefore limited the maximum boost pressure allowed to a value lower than 1.5 bar in order to avoid detonation. The high compression ratio is an interesting and relatively innovative approach as these engines tend to be more responsive off boost than other turbocharged engines using the more classic 8:1 or lower compression ratio. In racing spec however the compression ratio used is lower than in commercial guise as in this situation off boost performance is not part of the blueprint. Note that the turbo inlet (nozzle) area has had its diameter reduced from 105mm in previous versions to 98mm in order to favor low end response rather than high rev output. The turbo compressor wheel diameter is unchanged at 68mm. Overall the engines output remains unchanged at 280bhp (the Japanese legal limit) while torque gains 1kgm and now reaches 39kgm but a whole 900rpm higher than the previous version.

Body/Suspension/Wheels: Various features on the Evo 7 include vented front and rear disc brakes with ABS, 235/45ZR17 tires and the unchanged suspension layout from previous model, although with revised geometry and an overall wider track and longer wheelbase. The big piece de resistance, however, is the new ACD (Active Center Differential) which uses an electronically controlled clutch that gives better grip compared to the standard VCU type to improve traction, as well as the AYC (Active Yaw Control) stystem, which gives better torque distribution between the rear wheels.

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