Dyno Indicates BMW Fibbed On M5 Horsepower Ratings

So according to DynoJet, the M5 is really pushing out 620 HP if their standard 15% power loss holds true.

Then again, is it possible that the 15% may not be as constant as they believe and BMW is really delivering a 6% power loss through the powertrain?

Isn't Dynojet well known for showing numbers that are higher than other dynos? High power German turbo cars have had fairly conservative "paper" ratings the last few years. Probably because the hp that is quoted is for a worst case 100+ degree day just to be safe.

Absolutely agree. German manufacturers are known to state numbers which are on the low end of the high end. Just as they did years ago with their claimed 0-60, usually with a tank full of petro, spare tire, the whole nine yard, and get very conservative numbers, while Japanese counterparts would empty out their car to perform the 0-60.

Its all a part of their attempts to shroud the car's true potentials.

Wow, 527hp and 476lb-ft at the wheels is pretty nuts. Plus the max power platues for about a 1200rpm peroid.

*plateaus

Well they have to be over rating their 2.0 turbo because it blows the doors off of the competitions smaller cars with more powerful ratings. The Hyunbdai Santa Fe sport with the 270hp turbo engine takes 9.5 seconds 0-60 while the X3 doesn it in well under 7 sec. The 528i is bigger and heavier than the sonata and is down 30hp yet beats it 0-60 by over 2 seconds. heck, its faster than the lighter more powerful regal GS. They have to be over rating this engine because I doubt both Buick, Hyundai and Ford are all over rating their turbo engines.

Down rating