BMW 7 Series (E23)

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BMW 7-Series (E23)
Bmw e23 Park.jpg
Overview
Manufacturer BMW
Production 1977–1987
285,029 built[1]
Assembly West Germany
South Africa [2]
Designer Paul Bracq
Manfred Rennen (1974)
Body and chassis
Class Full-size luxury car (F)
Body style 4-door sedan/saloon
Layout FR layout
Powertrain
Engine 2.5 - 3.2 L M30 6-cyl
3.5 L M90 6-cyl
3.5 L M88/3 6-cyl
3.2 L M102 6-cyl turbo
3.4 L M106 6-cyl turbo
Transmission 4-speed manual
5-speed manual
3-speed automatic
4-speed automatic
Dimensions
Wheelbase 2,795 mm (110.0 in)[3]
Length 4,860 mm (191.3 in)[3]
5,014 mm (197 in) (US bumpers)
Width 1,800 mm (70.9 in)[3]
Height 1,430 mm (56.3 in)[3]
Curb weight 1,470–1,629 kg (3,241–3,591 lb)
Chronology
Predecessor BMW E3
Successor BMW 7 Series (E32)

The BMW E23 is the first generation of the BMW 7 Series luxury cars, and was produced from 1977 to 1987. It was built in a 4-door sedan body style with 6-cylinder engines, to replacing the BMW E3 sedans. From 1983 to 1986, a turbocharged 6-cylinder engine was available.

In 1986, the E23 was replaced by the E32 7 Series, however the E23 models (called L7) remained on sale in the United States until 1987.

The E23 introduced many electronic features for the first time in a BMW, including an on-board computer, service interval indicator, a "check control panel" (warning lights to indicate system faults to the driver), a dictaphone and complex climate control systems.[4][5] It was also the first BMW to offer an anti-lock braking system (ABS),[6][7] a driver's airbag[8][9] and a new design of front suspension.[10]

Features[edit]

BMW 728i

All models were powered by a straight-six petrol engine, with the majority of cars using the M30 engine. Most E23 engines were fuel-injected, however the 728 and 730 models of 1978-1979 used a Solex four-barrel carburetor. The fuel-injected models initially used the Bosch L-Jectronic system, until the 1979 732i, which was the first BMW to use the Bosch Motronic fuel-injection system.[11]

Options included leather upholstery, wood trim, power seats, seat heaters, reclining rear seats, power windows, power mirrors, an in-car cellular telephone and rear-armrest radio controls.[9][8]

Running changes[edit]

1985 BMW 735i (Australia). Note the wider and more angular twin-port grille compared to the 1977–1983 cars.

The 1983 model year facelift (produced from September 1982) included styling changes to the front of the car: the 'kidney' grilles, valance/spoiler, bumper bars, etc. Inside the car, the dashboard and instrument panels were also updated. The rear suspension was updated and the 735i engine changed from the M90 to the M30B34.

In the US, 1984 saw the arrival of the optional 4-speed automatic transmission[12] (replacing the 3-speed unit previously offered), wood trim replacing the plastic above the glove compartment and on the ashtray and electrically adjustable power seats. Michelin TRX tyres (requiring special metric wheels) became available as an option on the 5-speed manual models.

Special Editions[edit]

Turbocharged 745i[edit]

745i rear

The 745i was a high-performance model sold in left-hand-drive European markets from 1979-1986. It was initially powered by the M102 engine, which is a turbocharged 3.2 L version of the M30 straight-six engine, producing 188 kW (252 hp) at 9 PSI of boost.[13] In 1982, the engine was upgraded to the M106, which increased the capacity to 3.4 litres and the fuel injection system changed from Jetronic to Motronic. Boost pressure was reduced to 6 PSI,[14] however power output was unchanged.

All cars were built with a 3-speed ZF 3HP22 automatic transmission.[14][15] Options included heated front and rear power reclining seats, gasoline fired heater, leather covered cellular telephone, rear-armrest radio control, water buffalo hide upholstery, and burl wood trim.

The name 745i comes from the theoretical assumption that turbocharged engine have approximately 1.4 times more power than naturally aspirated engines. By this assumption, a 3.2 litre (3205cc) turbocharged engine would have similar power to a 4.5 litre (4487cc) naturally aspirated engine.

South African 745i[edit]

The South African 745i model was powered by the naturally aspirated M88/3 engine, instead of the turbocharged M102/M106 engines of the European 745i. A right-hand-drive version of the turbocharged model was not possible due to the turbocharger being located in the right-hand side of engine bay. Instead, the 745i was fitted with the 213 kW (286 hp) M88/3 engine, as used in the E24 M635i and E28 M5. The engine uses a 24-valve DOHC valvetrain and the fuel injection system is Bosch ML-Jetronic.

A production run of 209 South African 745i was built from 1983 to 1987, 192 of which were with an automatic gearbox and 17 with a 5-speed manual gearbox.[16]

BMW South Africa entered one of these 745i models in Class A of the South African Modified Saloon Car Championship The 745i won the championship in 1985,[17] the only BMW-Sanctioned motor sport application in the history of BMW 7-series cars.[18]

United States and Japanese market models[edit]

1984 BMW 733i with US bumpers

Only the 733i, 735i, and L7 models were sold in the United States and Japan.[19] These markets also received only upscale versions, usually including leather upholstery, cruise control, wood trim, power windows, power sunroof, and other options as standard.

North American versions were fitted with larger bumpers (to comply with the U.S. National Highway Traffic Safety Administration (NHTSA) standards), smaller sealed beam headlights, and various forms of emissions equipment that were not found on European-market cars. The engines used in these markets had lower-compression pistons and thus were less powerful than European-market versions. Some features such as ABS were available in markets outside North America before they were fitted on American models.

The L7 was a more luxurious version of the 735i for the American market only.[20] It featured special leather upholstery with leather dashboard and door padding (rather than wood trim), a power glass Moonroof. and a variety of optional features as standard. All L7 models were built with automatic transmissions and a standard driver's air bag.

Models[edit]

The following models were produced in the E23 generation: [1][21][22]

Model Years Engine Power Torque Notes
725i 1981-1986 M30B25 110 kW (148 hp)
@ 5,800 rpm
208 N·m (153 lb·ft)
@ 4,000 rpm
For government agencies & special order only[1]
728 1977-1979 M30B28 125 kW (168 hp)
@ 5,800 rpm
233 N·m (172 lb·ft)
@ 4,000 rpm
728i 1979-1986 135 kW (181 hp)
@ 5,800 rpm
235 N·m (173 lb·ft)
@ 4,200 rpm
730 1977-1979 M30B30 135 kW (181 hp)
@ 5,800 rpm
255 N·m (188 lb·ft)
@ 3,500 rpm
732i 1979-1986 M30B32 144 kW (193 hp)
@ 5,500 rpm
279 N·m (206 lb·ft)
@ 4,500 rpm
733i 1977-1982 145 kW (194 hp)
@ 5,500 rpm
279 N·m (206 lb·ft)
@ 4,300 rpm
733i (US) 1978-1979 132 kW (177 hp)
@ 5,500 rpm
266 N·m (196 lb·ft)
@ 4,000 rpm
United States & Japan only
1980-1981 129 kW (173 hp)
@ 5,200 rpm
255 N·m (188 lb·ft)
@ 4,200 rpm
1982-1984 135 kW (181 hp)
@ 6,000 rpm
264 N·m (195 lb·ft)
@ 4,000 rpm
735i 1979-1982 M90 160 kW (215 hp)
@ 5,200 rpm
304 N·m (224 lb·ft)
@ 4,000 rpm
1982-1986 M30B34
735i/L7 (US) 1985-1987 M30B34 136 kW (182 hp)
@ 5,400 rpm
290 N·m (214 lb·ft)
@ 4,000 rpm
United States & Japan only
745i (EU) 1980-1982 M102 185 kW (248 hp)
@ 5,200 rpm
374 N·m (276 lb·ft)
@ 2,600 rpm
1983-1983 M106 185 kW (248 hp)
@ 4,900 rpm
374 N·m (276 lb·ft)
@ 2,200 rpm
745i (SA) 1984-1986 M88/3 213 kW (286 hp)
@ 6,500 rpm
340 N·m (251 lb·ft)
@ 4,500 rpm
South Africa only

References[edit]

  1. ^ a b c Oswald, Werner (2001). Deutsche Autos 1945–1990, Band 4 (in German) (1. ed.). Stuttgart: Motorbuch Verlag. ISBN 3-613-02131-5. 
  2. ^ World Cars 1980, pages 340-341
  3. ^ a b c d "Fahrbericht: BMW 728 / 730 / 733 i". Auto, Motor und Sport (in German). 11 1977: 34–42. 25 May 1977. 
  4. ^ "The BMW E23 7-Series". www.autospeed.com. Retrieved 25 January 2017. 
  5. ^ "BMW 7 Series (E23) - 1977 - 1986". www.autoevolution.com. Retrieved 25 January 2017. 
  6. ^ Denton, Tom. Automobile Electrical and Electronic Systems. p. 390. Retrieved 25 January 2017. 
  7. ^ "History of Brakes in Motor Cars / Automobiles". www.carhistory4u.com. Retrieved 25 January 2017. 
  8. ^ a b "BMW 7 Series - A Look Back". www.topspeed.com. Retrieved 25 January 2017. 
  9. ^ a b "The first BMW 7 Series - E23". www.bmwblog.com. 9 November 2014. Retrieved 25 January 2017. 
  10. ^ Taylor, James. BMW M5: The Complete Story. Crowood. ISBN 9781785000461. Retrieved 25 January 2017. 
  11. ^ "BMW M30 and M102 Six Cylinder Engines". www.unixnerd.demon.co.uk. Retrieved 25 January 2017. 
  12. ^ "Road test 1985 BMW 735i E23". www.drive-my.com. Retrieved 3 March 2017. 
  13. ^ "The BMW Six Cylinder Guide". www.autospeed.com. Retrieved 24 January 2017. 
  14. ^ a b "BMW 745i E23 Turbo". www.uniquecarsandparts.com.au. Archived from the original on 15 July 2015. 
  15. ^ "Rmfd. automatic transmission". www.realoem.com. Retrieved 25 January 2017. 
  16. ^ "FAQ E23 745i SA (M88)". www.bmwmregistry.com. Archived from the original on 19 November 2010. 
  17. ^ "3½ Decades of BMW Motorsport in South Africa". Drive-My.com. Retrieved 10 March 2017. 
  18. ^ "BMW 745i SA -The M7 You Never Knew Existed". Topspeed.com. Retrieved 10 March 2017. 
  19. ^ "BMW 7'E23 model selection". www.realoem.com. Retrieved 20 February 2017. 
  20. ^ "The Bavarian luxobarge: A look back at the BMW 7-series". www.autoweek.com. Retrieved 20 February 2017. 
  21. ^ Covello, Mike (2002). Standard Catalog of Imported Cars 1946–2002. Iola: Krause Publications. pp. 149–155. ISBN 0-87341-605-8. 
  22. ^ "Automobil Review - catalogue edition". 1987: 196.