ALPINA B10 BITURBO(e-34)
In March 1989 at
the Geneva Motorshow Alpina introduced their fastest car so far,
the B10 BiTurbo. It is based on the BMW 535i and is still extremely
fast, in fact it is the second fastest car Alpina have ever made.
The fastest is the B12 5,7 Coupe. The B10 BiTurbo took two years
to develop and costed a staggering $3,2 million in R&D. But
it has paid off. The 3,5 litre, twin-turbocharged six-cylinder
engine is considered to be one of the best turbocharged engines
ever. The first car was delivered to it´s lucky owner in
August 1989. The last car, number 507, was produced in March 1994
and that car still belongs to Alpina.
When the car arrives
at Alpina, the engine is completely dismantled, as always. Then
they fit forged Mahle pistons, to bring the compression down to
7.2:1, they rebalance all moving pieces and remachine the combustion
chambers. The new pistons, which have oil-spray cooling of the
undersides, are married to stronger connecting rods. New valves,
which is sodium-cooled on the exhaust side, and a new camshaft
are also fitted. The intake and exhaust systems
are Alpinas own. They include new exhaust manifolds supplying
twin Garrett T25 watercooled turbochargers with an integrated,
electronically controlled wastegate feeding the engine through
a huge intercooler, which stretches from just below the kidney
grille down to the bottom of the spoiler. The good thing with
two small turbochargers is that the same boost is possible as
from a single larger unit but without the lag. Fuel injection
and ignition are reprogrammed Bosch Motronic. The Alpina exhaust
system(manufactured by BOYSEN) is made of stainless steel and
includes six metal-core catalysts with Lambda-Sond control. The
result at full boost, the B10 BiTurbo has variable boost control
made by Bosch(variable between 0,4-0,8 bar), is an output of 360
bhp and 520 Nm of torque. That is a little bit more than
the standard BMW 535i clutch and gearbox can take so Alpina have
fitted a stronger Fichtel & Sachs clutch and a 5-speed gearbox,
specially developed by Getrag, transmit the drive to the beefed-up
rear axle, which includes a 25-percent limited-slip differential.
are used all around with anti-roll bars and Bilstein-damped front
struts. At the rear, the Fichtel & Sachs shock absorbers also
control the ride height, which is hydraulically adjusted by an
electronically operated high-pressure system. The 17in Alpina
alloys make room from larger-than-standard Girling brakes with
Lucas 4-piston front calipers. They are of course ventilated all
around. The low-profile Michelin tires are 235 mm wide at front
and 265 mm wide at rear.
Inside, the seats
are replaced by Alpina´s own sportseats, manufactured by
Recaro. They are covered with anthracite Alpina cloth. A leather-covered
steering-wheel, which is made by Momo, is also fitted. As is a
polished wood interior. The B10 also have new instruments and
digital-indicators for engine-oil and rear axle-oil temperature
and for turbo boost and oil-pressure. The exterior changes include
a front spoiler, rear spoiler, the exhaust pipes and the wheels.
The stripes are optional. The last 50 cars have the wider kidneys
like the V8-engined 5-series cars and the new rearview mirrors.
The cloth-interior is changed to the ultra-luxurious "Alpina-wasserbüffel"
leather-interior. They also have new blue instruments and a new
a 0-100 km/h time of 5,6 seconds and a top speed of over 290 km/h.
200 km/h is passed after around 19 seconds.