Quote:
Originally Posted by Can'tHave2MuchHP
Since standardization of HP testing and certifications, "under rating" is a thing of the past. People speculated the same about Hellcats being "under rated" and it never turned out to be true. There are always happy dynos and perhaps even some factory freaks but if an engine is certified 668 HP, that means that it truly is 668 HP after averaging.
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I agree for American manufacturers that follow the SAE testing and rating procedure. However, and I don't have direct proof of this, but BMW and Porsche engines are typically quicker than we expect for their hp rating because I suspect they rate the power at worst case scenarios, i.e., 100F and 6000' elevation for a nasty high DA. Then at 70F and 500' elev. they make gobs more power.
How else does a '21 911 Turbo S that weighs 3,630 lbs and has "only" 640 hp, beat a Shelby GT500 from a roll despite a worse power to weight ratio?
Or, how does the new M3 Competition that weighs 3,800 lbs and has "only" 503 hp trap 125 mph in the 1/4 mile (Motor trend got 125.6 mph with a lighter car and C&D went 124 mph with a heavier car)? It also traps several mph more than a C8, despite having similar hp ratings and being 150-200 lbs heavier than the C8.
Or the 2018 911 GT2 RS that has the "same" power to weight ratio as a 2019 ZR1 (4.8 lbs/hp), but traps 140 mph compared to 131 mph by the ZR1 in the same comparison test.
Obviously, the German cars are rated differently than the American cars.