Alpina B7 Turbo

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Alpina
Alpina B7 S turbo (1978–1982)
Alpina B7 S turbo (1978–1982)
B7 turbo
Sales designation: B7 turbo
Production period: 12 / 1978-02 / 1982
Class : upper middle class
Body versions : limousine
Engines: Gasoline engine :
3.0 liters (221–243 kW)
Length: 4620 mm
Width: 1690 mm
Height: 1405 mm
Wheelbase : 2636 mm
Empty weight : 1485 kg
successor Alpina B7, model E28

The Alpina B7 Turbo was one of Alpina produced small series -car with turbocharger based on the model E12 of the 5-Series BMW .

History and technology

B7 S turbo

The B7 Turbo was first built in December 1978. It was the first complete vehicle that Alpina produced and was produced in small series. The B7 engine was based on the BMW M30 B30. Profound changes have been made to it. Fritz Indra , chief developer of Alpina, used a type K27 exhaust gas turbocharger from Kühnle, Kopp & Kausch (KKK), which enabled the high output of 221 kW (300 hp ) at that time . The torque was 463 Newton meters at 2500 revolutions per minute. KKK manufactured the turbine according to Indra's specifications. It worked with a variable boost pressure of 0.6 to 0.9 bar. With the valve open to the minimum, the unit developed 184 kW (250 hp), a value that the naturally aspirated engine also achieved - but only at a speed of 1000 revolutions per minute higher. At full boost pressure, the output could be increased to 221 kW (300 PS). At the end of the 1970s, the Alpina B7 Turbo was the fastest mass-produced sedan in the world.

The compression of the engine has been reduced. In addition, special pistons and a special resonance intake pipe based on the principle of the Hungarian designer Cser were used. The combined charging system for gasoline engines was achieved by connecting the resonance intake manifold to the turbocharger. In addition, the Zenith DL injection by Karl-Otto Noelle, which Pierburg manufactured, the Hartig ignition , a charge air cooler (air / air cooler) from Längerer & Reich and a Gillet twin-pipe exhaust system all contributed to the success. Alpina has developed the first series six-cylinder BMW turbo engine for the Alpina B7 Turbo .

The transmission and the rear axle have also been optimized on the drive train. This included the ingenious rear axle cooling from the point of view of the time. The oil is set in motion by a mechanical oil pump using a belt drive on the right drive shaft and can thus circulate in the housing and oil cooler. In addition, an HA temperature display was installed in the cockpit to keep the driver informed of the upcoming temperatures, because 140 ° C should not be exceeded. The rear axle was also available with a 25% lock as an option.

The car had a specially developed chassis with light alloy wheels in the style of the house as well as tires of sizes 205/55 at the front and 225/50 at the rear, which were still considered wide in the 1970s. Leather steering wheel, wooden gear knob, footrest, the alpina decor (outside) in the colors gold or silver and a silver-plated production number badge in the interior were part of the standard equipment of the model. Furthermore, the vehicles were equipped with an additional tank as standard, which increased the tank capacity to 109 liters.

149 Alpina B7 Turbo vehicles were built in just over three years. 1981-82 60 copies with 330 hp were built, called Alpina B7 S Turbo .

Alpina B7 Turbo Coupé

Alpina B7 also built the 153 times based on the model E24 of the 6-series BMW , then as Alpina B7 Turbo coupe called. In 1982, 30 units with 330 hp were built, called the Alpina B7 S Turbo Coupé .
Dimensions: length × width × height 4755 × 1725 × 1345 mm, wheelbase 2626 mm, weight 1550 kg.

Technical specifications

  • Type: B7 (base: BMW E12, BMW E24)
  • Engine: B7 (based on BMW M30B30)
  • Output: 221 kW (300 PS) at 6000 rpm (0.9 bar boost pressure)
  • Output per liter: 74 kW (100 PS)
  • Power-to-weight ratio : 6.7 kg / kW (4.9 kg / PS) (7 kg / kW [5.2 kg / PS])
  • Torque: 463 Nm at 2500 rpm
  • Displacement: 2986 cm³
  • Bore × stroke: 89.0 mm × 80.0 mm
  • Compression: 7.3: 1
  • Average piston speed: 16 m / s
  • Top speed: over 250 km / h
  • Acceleration 0-100 km / h: 6.5 s (6.8 s)
  • Fuel consumption in l / 100 km: total 12.9 l super plus
  • Empty weight: 1485 kg (1550 kg)
  • Construction period: 12/78 to 02/82
  • Quantity: 149 (153) vehicles

Models

model B7 turbo B7 Turbo
Coupé		 B7 S
Turbo		 B7 S Turbo
Coupé		 B7 Turbo / 1st B7 Turbo
Coupé / 1		 B7 Turbo / 1st B7 Turbo
Coupé / 1
Period 12 / 78-2 / 82 12 / 78-2 / 82 11 / 81-5 / 82 5 / 82-9 / 82 4 / 84-7 / 87 4 / 84-8 / 87 8 / 86-12 / 87 10 / 86-6 / 88
number of pieces 149 153 60 30th 236 110 42 20th
Basic model 528i (E12) 630CSi (E24) 528i (E12) 630CSi (E24) 528i, 535i (E28) 635CSi (E24 / 1) 535i (E28) 635CSi (E24 / 1)
Cubic capacity cm³ 2986 2986 3453 3453 3430 3430 3430 3430
kW / PS at 1 / min 221/300 at 6000 rpm 221/300 at 6000 rpm 243/330 at 5800 rpm 243/330 at 5800 rpm 221/300 at 5800 rpm 243/330 at 5700 rpm 235/320 at 5700 rpm 235/320 at 5700 rpm
Torque Nm at 1 / min 462 at 2500 462 at 2500 500 at 3000 500 at 3000 501 at 3000 512 at 2400 520 at 2400 520 at 2400
DIN consumption 12.6 l / 100 km 12.6 l / 100 km 12.2 l / 100 km 12.2 l / 100 km 11.8 l / 100 km 12.0 l / 100 km 12.0 l / 100 km 12.5 l / 100 km
0-60 km / h 3.1 s 3.3 s 3.4 s 3.4 s
0-80 km / h 4.6 s 5.0 s 4.6 s 4.6 s
0-100 km / h 6.1 s 6.6 s 5.8 s 5.8 s 6.1 s 6.1 s 6.2 s 5.8 s
0-120 km / h 8.3 s 8.6 s 7.9 s 7.6 s
0-140 km / h 10.2 s 11.4 s 10.1 s 10.1 s
0-160 km / h 13.8 s 14.6 s 12.5 s 12.6 s 12.6 s
0-180 km / h 17.9 s 18.4 s 16.6 s 15.9 s
0-200 km / h 23.6 s 24.8 s 20.3 s 20.7 s 21.4 s 21.0 s
1 km with stand. begin 25.8 s 26.2 s 25.2 s 25.2 s
Top speed 250 km / h 253 km / h 261 km / h 262 km / h 266 km / h 270 km / h 262 km / h 265 km / h

literature

  • Marc Cranswick: The BMW 5 Series and X5: A History of Production Cars and Tuner Specials , p. 46/47 Online

Web links

Individual evidence

  1. ↑ a b c d e f g h i j k l m n o p q r auto motor und sport 24/1978 p. 88 Date of publication: 21.11.1978
  2. ↑ a b c d e f g h i j k l m n o p q r s t auto motor und sport 12/1984 pp. 8–21 Date of publication: 13.06.1984
  3. ↑ a b Auto Zeitung 10/1979
  4. ↑ a b c d http://www.alpina-archive.com/?page_id=172&nmt=B7S-Turbo