Quote:
Originally Posted by ron_jeremy
What is the difference between this and the M550d? Similar numbers, great looking touring
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One less turbo = 1 less thing that can go wrong. Also Alpina reworks all the internals of the BMW engines they modify with higher quality components such as Mahle forged pistons etc. They also use their own turbos and oversize all the cooling systems (adding an oil cooler for example).
Below is information from their website about this tri-turbo engine:
6-Cylinder Diesel (D5 S)
The new BMW ALPINA D5 S (S for “Sportdiesel”) has the most powerful diesel drivetrain ever to feature in a BMW ALPINA automobile. The 3.0 litre straight-six cylinder engine with three turbochargers and common rail high-pressure direct injection delivers an impressive output of 285 kW (388 hp) between 4000 and 5000 rpm. A maximum torque of 800 Nm is available between 1750 and 2650 rpm.
The permanent two stage charging system comprising a total of three turbochargers is responsible for a responsive throttle and energetic power build-up while also ensuring maximum power output is achieved. The arrangement consists of two high-pressure stages with variable turbine geometry and one large low-pressure stage.
Power delivery is smooth, effortless, and – for a diesel – unusually dynamic over the entire rpm range. This is in part due to a flow-optimised air intake system with revised air filter housings which reduce pressure losses in the system overall, allowing the engine to breathe and rev freely.
More output requires more cooling. The high performance cooling package of the new BMW ALPINA D5 S is designed for maximum effectiveness. Large volume coolers and optimised coolant hosing allow high throughput rates. An indirect intercooler set-up keeps air intake distances short. A primary air-water cooler located in front of the engine supplies a large volume water-air intercooler. Additionally three external coolers and a transmission oil cooler guarantee thermodynamic stability even under highest loads.
Fuel consumption in the combined cycle measured according to ECE norms is 6.6 l/100 km with CO2 emissions of 174 g/km. The new BMW ALPINA D5 S is homologated according to the latest exhaust emissions standard Euro 6c.