This is an excerpt taken from Car and Driver....
"From the March 2014 Issue of Car and Driver
Even the cruelest parking valets are unlikely to rev a car’s engine to redline and dump its clutch. But that’s just what a Subaru engineer suggested we do when we asked him how to get the best acceleration times out of the 2015 WRX.
In human terms, this sort of launch is equivalent to jumping out of a moving car and hoping to suddenly start running like Usain Bolt.
“Rev the engine high enough to get wheelspin when the clutch engages, and shift out of first around 5200 rpm,” advised the engineer. With the four-wheel-drive traction of the WRX in mind, we wondered aloud, “You sure the clutch and gearbox will survive that launch?”
“Oh, yes,” he grinned.
And so, here’s how we hit 60 mph in 4.8 seconds: We held the engine at the 6700-rpm redline, jumped off the clutch, shifted out of first at about 5300 rpm, and held on to second until the car hit the redline in second at 61 mph. To get down to a repeatable 4.8-second time, we subjected the WRX to this mechanical mayhem 14 times. To its credit, it didn’t utter a peep of discontent. The clutch didn't slip, no driveshafts turned into fusilli, and the six-speed ’box shifted and responded exactly as it did when we started. Will you try this with your new WRX? We doubt it. And if instead you just ease off the line, your times will likely be somewhere closer to our 6.3-second rolling-start 5-to-60-mph figure.