Originally Posted by Rboosted717 (Post 789183)

Forget about the horsepower gain or top speed number, I want to see the shape of the power curve. Based on the graphs I've seen thus far for the other tunes on the market, the power is power/torque gains are all in the low-mid range rpm band.
Of course off the line in 1st gear you'll feel the increase, however, when it comes to rolling/passing acceleration you'll only be in the upper rpm range and will benefit very little. Check out the plot for the other unnamed tunes, then go drive your car and monitor the rpm range where you'll want to feel the power/torque increase, then review those same graphs.
Creating low-mid range power is easy on a factory turbocharged engine (most are mildly tuned/boosted in this area for drivability), however, creating additional top-end power can be very difficult, especially on an engine that's been optimized for top-end/ responsive power. .

Originally Posted by JDM996CAB (Post 791464)

The X6M needs the power increase in the upper rpm range. At about 100 mph the vehicle doesn't have the ability to pull away from other cars that were literally blown away off the line.

Originally Posted by HIRISC (Post 792688)

Correct, but its always a HP (and gearing) resolvable problem. Give the X 1000hp and see how fast she pulls from 100mph :)

Originally Posted by JCL (Post 792744)

Or one could drive something that isn't quite as much of a brick....

Originally Posted by HIRISC (Post 792749)

The X5M drag coefficient of 0.38 isn't that 'brick-like'.

My Z06 is .34 Cd by way of comparison.

Originally Posted by JCL (Post 793113)

'Brick like' referred to frontal area as well as drag coefficient. Look at your photo of the two vehicles side by side.

Anyway, I think the X5M is a very impressive vehicle. I just think that high speed runs will be naturally limited by the aerodynamics.