BMW 525i

The BMW 525i was a designed as competitive motorsport and mid-sized-executive family car, built throughout the years of E34 production. In 1992 BMW offered it as a Touring version for USA markets.

In mid-year 1990, the engine was switched from the SOHC engine of the M20 to the DOHC engine and labeled the M50B25, raising engine output from 170 Hp to 192 Hp or 141 kW. Fuel economy was immediately improved by ten percent, and a change from a composite rubber timing belt, to a timing chain improved the engines reliability. Periodic engine service was also a graet selling point for sales.

A further revision of the 525i engine took place in 1993, when VANOS was added to the M50 engine which was designated the M50TU label. The TU means ‘technical update’, reflecting the variable valve timing technology of the VANOS set-up which was added to the intake camshaft. VANOS brought no horsepower increase, but flattened the torque curve from about 3,000 rpm up to redline at approximately 6,300 rpm. USA engine versions had torque curves on the VANOS Engine raised from 181 ft-lb to 184 ft-lb of torque and 0-100 km/h times with automatic transmissions fitted, dropped to 9.1 seconds which was a significant improvement from the 10 seconds achieved by non-VANOPS motors. The M50 engine was the most popular variant and most popular BMW E34 model sold globally which sales figures almost met the 250,000 cars which were produced.

The 525iX was the only four-wheel-drive version in the E34 series produced by BMW which was available both as a sedan and as a touring car. It featured a computer-controlled rear and centre differential of which the centre diff would normally divide 36% torque to the front axles and 64% to the rear axles. The onboard computer could adjust the diff ratio’s according to the type of driving conditions incurred, shedding power transfers accordingly, thus enabling the axles to maximize power and grip amongst its four axles.

The BMW 525i was offered as a four-door sedan and station wagon. It was a worldwide success with production between 1988–1996 with 1,333,412 cars being assembled in Dingolfing, Germany and Toluca, Mexico.

The car was offered as a petrol and diesel powered car with the following engines:

Straight-6 cylinder engines

2.0 L M20B20
2.0 L M50B20
2.5 L M20B25
2.5 L M50B25
3.0 L M30B30
3.5 L M30B35
3.6 L S38B36
3.8 L S38B38

V8 Powered Engines

3.0 L M60B30
4.0 L M60B40

Diesel Powered Engines

2.4 L M21D24
2.5 L M51D25UL
2.5 L M51D25OL

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