Last month, Automobile Mag generated some chassis dyno numbers with a turbocharged BMW
335i coupe that were a bit healthier
than one would suspect, given the factory's rating of 300 HP at the crankshaft. In a follow-up, they're now stating that the 275 rear-wheel horsepower number that was reported was actually the lowest
of four pulls; one even generated 283 ponies. And all of this was with 92 F ambient temps - the sort of air that usually kills the output of boosted engines.
The publication then strapped a second sample to the same dyno, but this time in 78 F weather. Three runs yielded an average of 285 RWHP, with the other two varying from that by a maximum of three HP. Such consistency in the static air environment of a dyno is downright amazing and attests to the effectiveness of the Bimmer's intercooler and engine management system.
[Source: Automobile Mag]