Alpina B10 Biturbo

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Alpina
Alpina-B10-BiTurbo-Side View.jpg
B10
Production period: 1989-1994
Class : upper middle class
Body versions : limousine
Engines: Petrol engines :
3.4 liters
(257–265 kW)
Length: 4718 mm
Width: 1750 mm
Height: 1397 mm
Wheelbase : 2760 mm
Empty weight : 1695 kg
successor Alpina B10 V8 S.

The Alpina B10 Biturbo (spelling: Alpina B10 BiTurbo ) was a sports sedan built in small series from the automobile manufacturer Alpina . From September 1989 to March 1994 507 units were built, all of which - as is usual at Alpina - were given a consecutive production number. This was hammered into the right shock absorber dome, and a silver-plated nameplate with the production number was attached to the center console in the interior.

Technology and equipment

It was based on the BMW 535i (E34), whose inline six -cylinder engine was charged with 2 water-cooled Garrett T25 turbochargers in a parallel arrangement . The water-cooled shaft bearings on both loaders prevented coking of the oil lines as far as possible. In addition, a second, electrically driven water pump was installed, which continued to run for about 10 minutes after the engine was switched off. According to Alpina nomenclature, the engine was called B7 / 5, which was also the trade name for the B10 Biturbo. The use of two parallel turbochargers was a new feature at Alpina and ensured that the engine responded more quickly and more evenly and prevented turbo lag . The charge pressure regulation was controlled by the driver himself using a potentiometer. The maximum power was available at 0.8 bar overpressure, the adjustment range was between 0.4 and 0.8 bar boost pressure. Furthermore, an air / intercooler was flanged in front of the water cooler. A crankshaft with seven bearings was also part of the scope of machining, as were special cast pistons with squeeze edges and piston crown cooling from Mahle GmbH , which reduced the compression to 7.2: 1. In addition, special, artificially aged rocker arms were installed; this measure made the material more rigid and ultimately a stable engine. The measures described increased the output of the M30B35 engine from 155 kW (211 hp) to 265 kW (360 hp), and the maximum torque from the standard 305 Nm to 520 Nm.

The exhaust system consisted of a double-flow exhaust pipe, each line contained three Emicat catalytic converters with 100 cells (CH version 200 cells), wound from 40 µm thick coated stainless steel sheet. This design enabled a very large cleaning surface in a small space with little exhaust back pressure. The catalyst volume roughly corresponded to that of the cubic capacity. Alpina was the first manufacturer to use metal catalysts.

The Getrag 5-speed gearbox type 290 was a gearbox specially manufactured for the biturbo in order to be able to transmit the high torque of the engine. The cardan shaft got a reinforced center bearing from the M5 .

The rear axle with 25% lock was from the BMW M5. In addition, a rear axle cooling was installed at Alpina, the first 255 vehicles had a mechanical oil feed pump, this was driven by the right drive shaft by means of a V-belt. An electric pump was used from production numbers 256 to 507. This cooling was thermostatically controlled and had the advantage that the oil was not permanently cooled when the outside temperature was low, and it was also less prone to failure. The cooling coil was located in the rear between the rear cover plate and the bumper.

In the interior, alpine-specific wood applications were installed on the dashboard, the center console and the door panels. Sports seats, a sports steering wheel and a wooden gear knob were also part of the scope of equipment, as were the additional digital instruments for engine oil temperature, engine oil pressure, rear axle oil temperature and boost pressure display. A 30 liter additional tank was installed in the trunk, which increased the fuel supply to a total of 110 liters.

The exterior included 20-spoke aluminum wheels in Alpine design, 8.5 × 17 "at the front and 9.5 × 17" at the rear. The Biturbo had tires with 235/45 ZR17 tires at the front and 265/40 ZR 17 tires at the rear. Furthermore, the B10 had a sports suspension, a standard level control from Fichtel & Sachs at the rear and Bilstein shock absorber inserts, front and rear spoilers and the typical Alpina side decoration in gold or silver on the front axle.

In the last year of production, the equipment was expanded again. The standard equipment included complete water buffalo leather equipment, air conditioning and instruments with a blue background.

When it was launched in 1989, it was considered the most powerful series-production sedan in the world and the fastest German series-production car. The Porsche Turbo only surpassed it in 1995, when it was also equipped with two turbochargers.

As the most powerful series sedan, the B10 Biturbo was surpassed two years later by the Lotus Omega , whose more modern engine with four valves per cylinder and 0.2 liters more displacement with 277 kW (377 hp) produced 12 kW more. The fastest production sedan was also surpassed in 1996 by the Brabus E V12 based on the Mercedes-Benz E-Class , which reached an electronically governed top speed of 330 km / h.

Technical specifications

Alpina B10 Biturbo
Rear view
model Alpina B10 Biturbo
Cylinders / valves 6/12
Bore × stroke 92.0 mm × 86.0 mm
Displacement 3430 cc
compression 7.2: 1
Maximum power 265 kW [257 kW] (360 PS [350 PS]) at 6000 rpm
Max. Torque 520 Nm [501 Nm] at 4000 rpm
Top speed 291 km / h [287 km / h]
Acceleration 0-100 km / h 5.6 s [5.9 s]
Elasticity 80–120 km / h in 5th gear 9.2 s
1000 m, standing start 24.6 s
Fuel consumption in l / 100 km total 12.4
Empty weight 1695 kg (varies depending on the equipment)

[Values ​​in square brackets apply to vehicles for the Swiss market]

Test values

  • L × W × H: 4718 × 1750 × 1397 mm
  • Empty weight: 1695 kg
  • Switching speed 7300 / min
  • 0–40 km / h: 1.8 s
  • 0–60 km / h: 2.7 s
  • 0–80 km / h: 4.0 s
  • 0-100 km / h: 5.2 s
  • 0–120 km / h: 7.4 s
  • 0–140 km / h: 9.6 s
  • 0–160 km / h: 12.1 s
  • 0–180 km / h: 15.7 s
  • 0-200 km / h: 19.7 s
  • 400 m with a standing start: 13.2 s
  • 1000 m with standing start: 24.6 s
  • Top speed: 288 km / h

The US magazine Road & Track tested 0-100 miles per hour (161 km / h) in 11.6 seconds and a top speed of 288.4 km / h.

Web links

Commons : Alpina B10 Biturbo  - collection of images, videos and audio files

Individual evidence

  1. ↑ a b c d e f g h i j k l m Sport Auto 1/1990 p. 4–11
  2. ↑ a b c Auto, Motor und Sport 24/1989 pp. 12-18 Publication date: November 17, 1989
  3. ^ Road & Track September 1991