In addition to the two-door sedan and Baur convertible body styles of its E21 predecessors, the E30 was also available as a four-door sedan and five-door station wagon (marketed as "Touring").(p98)
The Touring body style began life as a prototype built by BMW engineer Max Reisböck in his friend's garage in 1984 and began production in 1987. The factory convertible version began production in 1985, with the Baur convertible conversions remaining available alongside it.
Initially, the E30 used carryover four-cylinder (M10) and six-cylinder (M20) petrol engines from its E21 predecessor. Over the production run, new families of four-cylinder petrol engines were introduced and the six-cylinder engine received various upgrades. A six-cylinder diesel engine was introduced, in both naturally aspirated and turbocharged forms.
Factory specifications are shown below.
* With catalytic converter: 90 kW (120 hp), 230 N⋅m (170 lb⋅ft)
** With catalytic converter: 125 kW (168 hp), 221 N⋅m (163 lb⋅ft)
At the launch of the E30 range in 1982, the 316 used a 1766 cc version of the M10 fed by a carburetor and producing 66 kW (89 hp). The 318i had the same M10 engine, but with Bosch L-Jetronic fuel-injection, increasing power to 77 kW (103 hp) while also improving fuel economy.
The 1987 Series 2 update introduced a new four-cylinder engine: the M40, which used Bosch Motronic fuel-injection. In the 318i, a 1,796 cc (110 cu in) version of the M40 was used. The 316i model replaced the 316, using a 1,596 cc (97 cu in) version of the M40.
The 318iS coupé was released in 1989, using the new M42 engine. This is the most modern engine available in the E30 range, incorporating DOHC, the updated Bosch Motronic 1.3, hydraulic valve adjusters and coil-on-plug ignition. In some markets, the M42 engine was used in the 318i/318iC models, instead of the M40.
The M3 is powered by the S14 engine, a high-revving four-cylinder engine.
At the launch of the E30 range, the six-cylinder models consisted of the 320i, which had a 2.0 L (122 cu in) version of the M20 producing 92 kW (123 bhp), and the 323i, with a 2.3 L (140 cu in) M20 producing 102 kW (137 bhp), both using Bosch L-Jetronic fuel injection. These models were not sold in North America, presumably for emissions reasons. In 1985, the 2.3 L engine was replaced with a 2.5 L version of the M20, which produced 125 kW (168 bhp) and used Bosch Motronic fuel injection. This engine was available in the 325i variants, including the all-wheel drive 325iX.
An economy version called the 325e was released with a lower revving, more fuel efficient engine. The e is an abbreviation for eta, which is used to represent the thermal efficiency of a heat engine. To maximise low-rev torque, the 325e engine was the largest available in an E30 (aside from the 333i model, which was only sold in South Africa). The 325e engine had a longer stroke than the 325i version, with a more restrictive head, four cam bearings instead of seven, and single valve springs (instead of the dual valve springs used by the 325i version). For versions without a catalytic converter, the 325e engine produced 90 kW (121 bhp) at 4250 rpm and 240 N⋅m (177 lbf⋅ft) at 3250 rpm. By comparison, peak torque for the 325i engine was 215 N⋅m (159 lb⋅ft) at 4000 rpm.
The 1987 Series 2 update boosted the 320i to 95 kW (127 hp) and the 325i to 125 kW (168 hp), and improved fuel economy.
In 1983 the 324td was unveiled at the IAA, Germany. The M21 engine used a Garrett turbocharger (without an intercooler). The engine has a capacity of 2,443 cc (149 cu in) and uses mechanical fuel injection.
In 1985 BMW introduced the 324d, a naturally aspirated version of the same M21 engine, which was popular in countries with a high motor vehicle tax.
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