BMW 5 Series (E28)

The BMW E28 is the second generation of BMW 5 Series executive cars, which was produced from 1981 to 1988 and replaced the E12 5 Series. Pre-series production began in April 1981 and the car was introduced in the autumn that year.

The E28 was initially produced with straight-four and straight-six petrol engines until 1983, when the 524td model became the first BMW car to be powered by a diesel engine. It was also the first 5 Series with the centre console angled towards the driver and to be available with anti-lock brakes (ABS).

The first BMW M5 was produced during the E28 generation. It was powered by the M88/3 and S38 straight-six engines. The E24 6 Series coupés were built on the E28 platform from 1982 to 1989.

The E28 was replaced by the E34 5 Series in 1988.

Body and interior
The E28 has a self-supporting body that is welded to the body platform. The passenger cell is a safety passenger cell with deformation elements both in the front and rear of the vehicle. Unlike its E12 predecessor and E34 successor, the E28 has a rear-hinged bonnet. The boot has a volume of 460 litre. Most models have a fuel tank capacity of 70 litre, with some models having a smaller tank of 63 litre. The kerb weight is 1140 –.

Cruise control, an on-board computer (to display trip information), and a "check control" panel (to alert the driver about fluid levels and lighting faults) were introduced to the 5 Series on the E28. The glazing is made of single-pane safety glass, the windscreen has laminated glass. As part of developing the air-conditioning system for the E28, several of the BMW engineers in charge of this program drove a previous generation E12 5 Series during the middle of summer in Texas. The E12 528i was painted black with a black interior, and driven 500 mi in one day.

The styling was developed under BMW's chief designer Claus Luthe, with development of the E28 beginning in 1975. At the time that BMW was designing the E28, the company had only one computer, which was used for payroll management and spare parts logistics. Wolfgang Matschinsky and his team borrowed that computer to perform the calculations necessary to develop the new drivetrain and chassis. This was due to the fact that the addition of an ABS system necessitated a redesign from the previous model due to excessive vibrations under heavy braking.

Engines
The E28 was the first 5 Series produced with diesel engines (the 524d and 524td models) and with a petrol engined model specifically aimed at increased fuel economy (525e/528e model).

The four models available at the launch of the E28 were the 518, 520i, 525i and 528i, with the 518 using a straight-four petrol engine and the other three models using a straight-six petrol engine. Over the course of the E28 model, the following models were added: the 524d and 524td using diesel engines, the 518i (a fuel-injected version of the 518), the 525e/528e as fuel-economy models, and the upper-specification 533i, 535i, M535i, and M5 models.

A liquid petroleum gas (LPG) option was introduced for some petrol engines in 1984.

Petrol
518: Sold only in some European markets where it suited local tax categories, the 518 was the lowest specification model which used a four-cylinder engine with a carburetor. Factory performance figures for the manual transmission cars are a top speed of 164 km/h and 0–100 km/h acceleration in 14.0 seconds.

518i: The base model in Japan and some European countries, the 518i used a fuel-injected four-cylinder engine. Factory performance figures for the manual transmission cars are a top speed of 175 km/h and 0–100 km/h acceleration in 12.6 seconds. This version was not sold in Germany until the 1984 facelift, when it replaced the carburetted 518.

520i: A mid-range model with the smallest of the available six-cylinder engines. Factory performance figures for the manual transmission cars are a top speed of 190 km/h and 0–100 km/h acceleration in 11.4 seconds.

525e / 528e: The 525e (called 528e in North America and Japan) uses a longer stroke 2.7-litre version of the 6-cylinder M20 petrol engine, is optimised for fuel economy and torque at low engine speed rather than the traditional high revving characteristics of BMW straight-six engines. The "e" stands for the Greek letter eta, for economy. According to BMW, the 525e is more fuel efficient than the 520i, which has the same rated power of 92 kW. Since many markets tax cars based on engine displacement, the eta's larger engine meant that it was not suitable everywhere. The model was expressly developed with the American market in mind. BMW's corporate average fuel economy was at risk of not meeting requirements by 1984, primarily due to higher sales of their bigger, more expensive cars in the early 1980s. In Austria, the 525e was detuned to 88 kW.

Factory performance figures for the manual transmission cars without a catalytic converter are a top speed of 190 km/h and 0–100 km/h acceleration in 10.7 seconds. With a catalytic converter, the figures are a top speed of 188 km/h and 0–100 km/h acceleration in 11.3 seconds

525i: This mid-range model is powered by a 2.5-litre 6-cylinder engine. The 525i was only sold in Europe. Factory performance figures for the manual transmission cars are a top speed of 201 km/h and 0–100 km/h acceleration in 9.8 seconds.

528i: Initially the highest specification available, the 6-cylinder 528i became a mid-range model following the release of the 533i and 535i models. Factory performance figures for the manual transmission cars are a top speed of 215 km/h and 0–100 km/h acceleration in 8.4 seconds.

533i: Only sold in Japan and North America, the 6-cylinder 533i was the highest specification model during its production years of 1983–1984. It was replaced by the 535i.

535i/is: Released in 1984, the 535i replaced the 533i and uses the same 6-cylinder drivetrain as the M535i. In the US there was also a 535is model, which included sport seats and spoilers at the front and rear. Factory performance figures for the manual transmission cars without a catalytic converter are a top speed of 225 km/h and 0–100 km/h acceleration in 7.2 seconds. With a catalytic converter, the figures are a top speed of 212 km/h and 0–100 km/h acceleration in 7.9 seconds

M535i: The top of the regular production model range, the M535i uses the drivetrain from the 535i plus M-Technic suspension, and wheels and body panels not found on any other E28. The M535i was assembled on the standard E28 assembly lines in Dingolfing and Rosslyn. Factory performance figures for the manual transmission cars without a catalytic converter are a top speed of 230 km/h and 0–100 km/h acceleration in 7.2 seconds. With a catalytic converter, the figures are a top speed of 217 km/h and 0–100 km/h acceleration in 7.9 seconds

Diesel


524d: At the 1986 Geneva Motor Show, four years after the introduction of the more powerful 524td model, the naturally-aspirated 524d model was introduced. It was only sold in some markets.

524td: This turbodiesel model was the first diesel car produced by BMW. It entered production in late 1982, when 100 pre-series cars were built. Factory performance figures for the manual transmission cars are a top speed of 180 km/h and 0–100 km/h acceleration in 12.9 seconds.

Drivetrain
BMW offered the E28 with both manual and automatic gearboxes. The torque is transmitted from the engine with a single-disc dry clutch with a torsional damper in the models with a manual gearbox, the automatic models have a torque converter with built in lockup-clutch.

The 4-speed manual transmissions are:
 * Manual transmissions
 * Getrag 242 (for M10 and M20 engine models)
 * Getrag 262 (M30 engines)

The 5-speed manual transmissions are:
 * Getrag 240 (M10 and M21 engines)
 * Getrag 245 (M10 engines)
 * Getrag 260 (M20, M21 and M30 engines)
 * Getrag 265 (M30 engines and 525e/528e)
 * Getrag 280 (M88/3 and S38 engines)
 * ZF S5-16 (M20 engines)

The 3-speed automatic transmissions are:
 * Automatic transmissions
 * ZF 3HP22 (M20 and M30 engines, US market only)

The 4-speed automatic transmissions are:
 * ZF 4HP22 (M10, M20, M21)
 * ZF 4HP22 EH (M20, M30)

Suspension
Independent front and rear suspension is used, with Macpherson struts at the front and a semi-trailing arm design for the rear.

The front suspension was upgraded to use dual links at the bottom of the strut, as first seen on the E23 7 Series. This increases steering offset while cornering, to improve steering feel. Double-acting shock absorbers, coil springs and a front anti-roll bar are used.

The rear suspension is mounted on a delta beam that is connected to the body with three screws in rubber bearings, that have longitudinal play. Some models have a rear anti-roll bar.

The steering on most models is a speed-dependent recirculating ball power steering system made by ZF Friedrichshafen. The 518i has a Gemmer steering system with a double enveloping worm gear, also made by ZF.

Wheel sizes are 14-inch (16-inch for the M5 model) or 390 mm Michelin TRX. All rims have 22 mm positive rim offset.

Brakes
The brakes use a hydraulic dual-circuit brake system with power assistance. The front wheels have disc brakes, that are – except for the 518i – internally ventilated. All models with 2.5 L or more displacement have rear disc brakes (non-vented), while the lesser powered models have rear drum brakes. To prevent the wheels from locking, BMW equipped the E28 after 1984 with an anti-lock braking system, although it was an option in some markets.

M5 model


The E28 was the first M5 model produced, and is powered by the M88/3 and S38 straight-six engines.

North American market models
The North American line-up consisted of the 528e (1982–1988, known as the 525e in Europe), 533i (1983–1984), 535i (1985–1988), 524td (1985–1986), M5 (1986–1987) and 535is (1987–1988).

The launch model was the 528e in 1982, followed by the 533i. The optional automatic transmission was initially a 3-speed (a 4-speed automatic was available in Europe at the time), with a 4-speed automatic transmission becoming optional in 1983. From 1985, all North American models had ABS Brakes as standard.

The North American E28 models had larger bumpers (designed to withstand a 5 mph collision without body damage), which increased the overall length by 180 mm.

The 528i, 533i and 535i were sold with a catalytic converter in the United States.

Instead of importing the M535i, BMW of North America created the 535is. This model is based on a 535i, plus front and rear spoilers, sport suspension and sport seats.

Production of North American market M5 models began in late 1986 (two years after M5 production began for European markets), and it was only produced for twelve months as 1988 model year car. North American M5 models use the S38 engine instead of the M88/3. All North American M5 cars were painted Jet Black and most interiors were tan ("Natur") coloured leather.

Production
E28 production started in July 1981 and ended in December 1987. A total of 722,328 cars were built.

The E28 was still sold in North America as a 1988 Model Year car after its E34 successor had been released in Europe in early 1988. A limited edition model was also sold in South Africa from mid-1987 to the end of 1988.