- 4,896
- UK
Based on the E34 and developed at a cost of $3.2 million, the B10 BiTurbo was introduced in March 1989.
To build each B10 BiTurbo powerunit Alpina dismantled a M30 engine, replaced the stock pistons with forged Mahle units, installed two Garrett T25 water-cooled turbochargers, and added a Bosch variable boost control with range of 0.4-0.8 bar, adjustable from the driver's seat. Additional modifications helped raise the horsepower of the stock M30 engine from 155 kW/208 hp at 5700 rpm and 305 Nm/225 lb-ft at 4000 rpm to 265 kW/360 hp at 6000 rpm and 520Nm/384 lb-ft at 4000 rpm. A Getrag 290 5-speed manual transmission was specified to handle the power.
Modifications to the suspension included Alpina-spec springs and anti-roll bars. Bilstein shocks were used on front and automatic-load levelling units by Fictel & Sachs were used in the rear. Front rotors were large 13.1-inch discs from UK-based Lucas Girling, bigger even than the 12.8-inch pieces found on the E34 M5. Michelin MXX tires were standard as was BMW's Automatic Stability Control. The company claimed a 0–100 km/h time of 5.6 sec and a top speed over 290 km/h.
Sources: http://www.alpina-archive.com/?page_id=178&nmt=B10-BiTurbo
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