From the alpinaregister site (thanks bumps):
Quote:
The D3 engine starts life as the 2.0-litre four cylinder turbocharged diesel that you find in a normal 320d. ALPINA use a combination of other BMW model parts plus some of their own grown technology to breathe more life into the engine.
From the 330d they use the exhaust half of its turbo. This is bigger and therefore can accommodate more airflow. They also use the 330d’s intercooler to accommodate the new engines thirst for cold air.
From the 535d they use its injectors.
Finally, the inlet half of the turbo is a patented ALPINA/Garrett/ Honeywell unit.
The goal of these changes was simple: to double the throughput of fuel that can be delivered per millisecond. Effectively this allows the car to rev higher and thus give a much more exploitable engine. If you drive the 320d you will find that the power tops out between 3,800 – 4,000 rpm; in the D3 this is extended to between 4,500 – 4,600rpm on to its redline at 5,000rpm.
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