| Displacement was increased to 2467cc thanks to a bore and stroke of 95 x 87mm (up from 93.4mm and 84mm respectively). New camshafts, pistons and sodium-cooled exhaust valves further enhanced the 2.5's credentials. An 18bhp gain saw output rise to 238bhp at 7000rpm, the Evo III motor also getting larger inlet valves, a compression ratio dropped down to 10.2:1 and red-capped spark plug leads. Ride height was dropped by 10mm at the front and there were even wider wheelarch flares, adjustable spoilers having been variable through three alternative angles. Other changes saw re-profiled vanes in the front grille, BMW offering the Evolution III in a choice of only two exterior shades. These were Brilliant Red and Jet Black, both of which were finished with contrasting bumper inserts and BBS cross-spoke wheels with Nogaro Silver centres and polished rims. To compensate for the heavier 2.5-litre engine, lightweight front and rear bumpers were fitted along with thinner side and rear glass. Inside, there were new high-backed seats while brushed suede upholstery was used for the steering wheel rim, handbrake, gear shift and drivers footrest. Upholstered as standard in a striped pattern cloth unique to the Evolution III, an illuminated gear knob from the Cecotto/Ravaglia limited editions was also used. There was no air-conditioning or electric windows, each car receiving a numbered plaque on the centre console. Built between December 1989 and March 1990, 600 Evolution III's were completed, collectors ranking these as the best M3's ever built. |
