The E30 M3 was conceived to satisfy Group A homologation requirements, which mandated production of at least 5,000 base models and 500 evolution specials. Presented to the public at the 1985 Frankfurt Motor Show, it was based on the E30 3 Series coupé but shared only the bonnet, roof panel, and sunroof with the standard car. All other body panels were either modified or unique to the M3, including a flattened rear window, a raised glass-reinforced plastic tailgate, reshaped C-pillars, and bespoke aerodynamic elements at the front and rear. These changes reduced the drag coefficient from Cd 0.38 to Cd 0.33.
The E30 M3 used the BMW S14 four-cylinder engine, a high-revving DOHC unit with a head derived from the BMW S38 six-cylinder and the block from the M10 four-cylinder, with a 7,250 rpm redline. In catalyst-equipped markets the engine was rated at 195 PS; without a catalyst, 200 PS. The transmission was a Getrag 265 five-speed manual; European cars used a dogleg shift pattern with close ratios and a 1:1 fifth gear, while North American versions had a conventional pattern with wider spacing and an overdriven fifth. A clutch-type limited-slip differential was standard.
To maintain competitiveness under evolving homologation rules, BMW produced a series of evolution models sold in limited volumes.
The Evolution 1, released in 1987 with 505 examples, featured a revised cylinder head to improve performance. Fifty were commissioned by BMW France to celebrate the M3's Tour de Corse victory that year.
The Evolution 2, released in 1988 with 501 examples, introduced revised camshafts, higher-compression pistons (11.0:1 from 10.5:1), a more efficient intake, and a lightened flywheel, raising power to 220 PS at 6,750 rpm. Visual changes included a deeper front airdam with brake cooling ducts and a rear spoiler with trailing flap.
The Sport Evolution of 1990, limited to 600 units, raised engine displacement to 2,467 cc and power to 238 PS at 7,000 rpm. Top speed increased to 250 km/h. Sport Evolution models featured adjustable front splitter and rear wing positions and enlarged brake cooling ducts.
In April 1989 the Ravaglia and Cecotto limited editions were released, named after DTM drivers, with power raised to 215 PS. Ravaglia production was just 25 cars; Cecotto ran to 480 (plus 80 for Switzerland).
The E30 M3 was among the most successful touring cars of the late 1980s. In full race trim the 1988 car's 2.3-litre naturally aspirated engine produced approximately 300 PS. With the 2.5-litre evolution engine introduced in 1990, race power reached approximately 379 PS.
The car won the 24 Hours Nürburgring five times (1989, 1990, 1991, 1992, 1994) and the Spa 24 Hours four times (1987, 1988, 1990, 1992). It also contested the World Rally Championship with Prodrive-prepared examples, winning the Tour de Corse in 1987 driven by Bernard Béguin — the M3's standout rally result on asphalt.
Championship titles included: World Touring Car Championship (1987), European Touring Car Championship (1987, 1988), British Touring Car Championship (1988, 1991), Deutsche Tourenwagen Meisterschaft (1987, 1989), Australian Touring Car Championship (1987), Asia-Pacific Touring Car Championship (1988), and seven consecutive Japanese Touring Car Championship titles in the JTC-2 class from 1987 to 1993.
Sports Car International named the E30 M3 sixth on its list of Top Sports Cars of the 1980s in 2004. Automobile Magazine included it among the five greatest driver's cars of all time in their 25 Greatest Cars of All Time feature in 2007. The E30 M3 established the M3 formula — a high-revving four-cylinder in a tightly engineered compact shell — that later generations would continue and evolve.
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