Originally Posted by ruff
One of the most informative posts I have see in some time. I am still a bit confused about horsepower ratings 414 vs 420. I haven't seen different horsepower ratings on the RS4 or GT3. I heard it is rated by different measurements. Car and Driver stated 414. Please explain. Thanks.
420 is PS (another standard)
414 is SAE HP
I actually entered 309 KW into the software and it converted to SAE.....all the same.
From Wikipedia: PS is defined as 0.73549875 kW, or roughly 98.6% of SAE horsepower