Quote:
Originally Posted by E90 Skye
Could it just be that power loss is controlled much better through a more efficient build than your typical cars that you're dynoing with 20% losses? I'm sure it is still underrated but to say it is underrated by 30 or 40 hp is a bit crazy. What is the advantage for BMW?
couldn't they just say "class leading hp" by saying its a 340hp 3.0liter inline6 that still has good fuel economy?
I'm thinking it is probably making 310ish at the crank... but I would be surprised if it is much more than that.
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The power loss usually occur from moving parts. There is no way around it unless you are using Carbon & Aluminum moving bits from the engine flywheel to the tires to reduce that loss, but you cant eliminate it.
Also, power loss is usually larger on an Automatic due to the TQ Converters they run. That why the figure on a Front Engine, Rear Wheel drive Auto is between 18-22%.