The age old question never goes away. Which is faster? Which creates more power?
The aim of this analysis is to determine, which is "better"? from a purely mathematical standpoint. Real world results WILL vary.
The G37 revs higher by 500 RPM.
The G37 has more gears and more agressive gearing
The 335 is twin-turbo, while the G37 is NA.
Let us review a dyno of both engines first.
The dynos makes a few things clear.
The 335 has more torque, both peak, and midrange. However, the 335's torque steadily declines as you rev higher and higher.
The G37's torque doesn't have that sudden jump, but the curve is much smoother, and doesn't have that severe dropoff that the 335 does. This is important, since the G37 also revs higher.
The horsepower curves show that the G37 continues to climb in power, all the way to redline (showing that raising the redline would have beneficial power gains on this car), while the BMW chokes, and declines in power as it nears redline.
The graphs also show, that at any RPM before 6000, the BMW makes more power. However, after 6000 RPM, the G37 makes more power.
Now, to address the question: which is faster? Your average 335 supporter will state the 335. It's easy. It has more torque they say. Hell, even a lot of G37 owners will say the same, as they've had a few bad experiences already and have learned the hard way.
However, at this point, I'd point out that when you race, you are not using the middle or bottom of the powerband. You only use the top. (This is key to those reflashes available for the 335; the reflashes decrease/eliminate the torque dropoff toward redline, significantly increasing horsepower.). To further convolute this, the G37 has more agressive gearing, and more gears. How can we ever figure this out?
This is a graph of the torque the G37 generates to the wheels, accounting for gearing. Your typical dyno graph uses adjustments in an attempt to isolate power made just by the engine. This graph does not do that (and thus, the numbers are much higher).
Now, some more graphs.
This graph shows the torque put to the wheels at any given speed at wide open throttle for both cars.
This graph shows the power put to the wheels at any given speed at wide open throttle for both cars.
Finally, a graph of all 4.
What information can we get out of this? When gearing is factored for, the BMW doesn't really have a significant torque advantage at any speed higher than 30 MPH.
It does have an advantage between 60 and 70 MPH, so if you're racing against one, don't start at those speeds. This is confirmed by the higher HP output between 60 and 70.
But, look at the HP curve. The g37's advantages definitely add up to more than the 335's advantages....
Coming soon: Additional analysis including: Weight, power-to-weight ratio, and aerodynamics also factored in.