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Originally Posted by KORALLROT
Isn't this engine already under rated and BMW under reporting its output ?
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All of the petrol turbo BMW motors appear to be underrated. I wonder if BMW did this for regulatory reasons (insurance and horsepower taxes) or if all these motors have a built in overboost mode that lasts long enough to spin up a rear wheel dyno roller.
About 30 years ago when horsepower ratings started rising due to the implementation of common rail port fuel injection many manufacturers were rating engines at 300hp because they were afraid of a high performance insurance surcharge. That went on for a few years and then passed.