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PostPosted: Mon Nov 07, 2011 10:50 pm    Post subject: The Science of Speed: 2011 Porsche 911 GT2 RS Reply with quote

With 620 horsepower, the Porsche 911 GT2 RS is a handful to drive. We trained our high speed video cameras on the GT2 RS as it takes a high speed corner to analyze the science of the most powerful 911's speed.


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http://www.motortrend.com/features/performance/1112_the_science_of_speed/

Quote:
When I think of the Porsche 911, the mental snapshot that flutters out of my memory is a snow-white car with red and blue stripes sliding vertically through my field of view. It was toward the end of a 4-hour endurance race at the old Ontario Motor Speedway, and I was flat on my back in near-empty grandstands, head cocked sideways, as Peter Gregg's Brumos Porsche 911 RSR masterfully drifted through a right-hander.
Maybe I should've sat up and paid closer attention. Because here I was, 37 years later, traveling backward at about 90 mph in a $245,000 911 GT2 RS.

Frankly, I reckoned the first half of my cornering assault had gone rather well. Not Peter Gregg caliber, maybe, but...and just like that, I was pirouetting. The warp-speed movie in the windshield was suddenly in rewind. Things I'd passed were now not only shrinking, but gradually being obscured by a contrail of my own dust. You have no idea how long it takes to stop while traveling backward at 90 mph.

There's time to reflect on how small the Michelin's contact patches actually are compared with the more than 3177-pound Porsche dancing on top of them. Time to wonder how the GT2's wind-tunnel-tuned aerodynamics are responding to a 90-mph air blast that's suddenly swapped directions. And how, if you snip all the strings of Porsche's brilliant stability-control safety net, you're still -- even in nanny-state 2011 -- really asking for it.

As I jolted to a stop, the back of my head rapped off the headrest and a hail of grime caught up and peppered my face (one must remember to nonchalantly close the windows in these situations). I wiped my eyes and slumped back in the tight, form-fitting seat. How is this done correctly?

We try to be responsible folks when we tear around corners (and sometimes spin) quarter-million-dollar, 620-horsepower Porsches, so all this was taking place on a goof-proof, cone-marked bend created at an intersection of runways at the old El Toro, California, airbase. Via an array of instrumentation, we turned this 900-foot elbow of asphalt into a giant microscope slide. What do we see when we draw the image into focus? Let me try that corner again, and as I hurtle through it as fast as my modest skills allow, take a magnified look at the spreadsheet of data we recorded. We'll be hearing, too, from an expert trio of commentators -- and sometimes kibitzers -- in the business of sports car cornering.



The 911 -- and specifically, this mightiest of them all with 620 turbo horsepower, rear drive, and a classic manual shifter -- is a car with a devil on one shoulder and a sorcerer on the other. The red guy with the tail is forever egging the Porsche to go ahead and revolve into the front-engine car Isaac Newton would expect it to be -- something that's a foot flinch away when you deactivate both stability and traction control. Meanwhile, the sorcerer is conjuring the next fast corner into a physics-defying, life-changing encounter. Get it right -- really, really right -- and you're an instant blood brother in a 911 club that figures this to be the only sports car that really matters. But how do you get a corner right in a 911? And what's really happening when you do it?

The elapsed time between my pistoning the brake pedal and blistering out of the corner was about 8 seconds. Watched in real time, it was a keening of the brakes, a quick rotation, a wag by the rear, a wiggle at the front, and an afterburner exhaust whoosh that made the photographers instinctively lean back. Gone. Our crack video crew captured it with a high-speed camera. Watching it slowed way down is like studying slo-mo footage of Fred Astaire dancing. Suddenly you see the straining muscles and the beads of sweat. Approaching the corner in third gear at 100 mph, I pulled hard on the snorting Porsche's reins. The GT2's deceleration touched 1.09 g as the car's nose snapped down a slight 0.8 degree. Underfoot, the brake pedal felt firm, as if bending a plank with my foot. Despite its reputation as a sports car, the 911 does its best work stopping. With 62 percent of its weight on the rear axle, hard braking redistributes the rump weight forward, somewhat evening out the tire loading.

Technically, these are astonishing brakes, with six-piston front calipers previously used to grab the rear discs of the mighty Carrera GT; within them is brake fluid that's thermally isolated via zirconium inserts. At the rear, the brakes are a ceramic riff on the 911 Turbo's with stiffer calipers and fatter pistons.

"The mistake most people make with a car like a GT2 is they charge into a corner too fast," warns Hurley Haywood. As a five-time winner of the 24 Hours of Daytona, a thrice victor at Le Mans, and quite simply, the greatest driver in the 911's history, Hurley knows of what he speaks. (Coincidentally, he was driving a Brumos 911 RSR in that same IMSA race I mentioned earlier, and later became Brumos' team leader and executive vice president.) "Enter too fast in a 911 -- easy to do in a GT2 -- and the car is going to understeer."

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CarraraWhite
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PostPosted: Sun Nov 27, 2011 2:23 am    Post subject: Reply with quote

Thumb Very Happy Mr. Green Thumb
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Ocean Blue
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PostPosted: Sun Nov 27, 2011 9:13 pm    Post subject: Reply with quote

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wow just something else.
 
  
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nick w
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PostPosted: Sun Nov 27, 2011 9:52 pm    Post subject: Reply with quote

Awesome car !!! Thumb
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Roro
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PostPosted: Sun Nov 27, 2011 10:42 pm    Post subject: Reply with quote

Excellent, very informative. So nice to see a GT2-related review that doesn't shout "this car will kill you, don't buy it unless you want to die!!!" Thumb
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mikegr
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PostPosted: Tue Dec 06, 2011 9:07 am    Post subject: Reply with quote

So much technology and still can't beat the half priced Viper ACR...
 
  
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PeterS
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PostPosted: Tue Dec 06, 2011 9:37 am    Post subject: Reply with quote

Apparently so many inherent flaws, and yet the most amazing cars to drive.

Interesting F1 analogy too.

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Roro
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PostPosted: Thu Jun 27, 2013 9:07 pm    Post subject: Video - The science behind cornering a GT2 RS Reply with quote

.. Or any 911 really for that matter... good video.

(... Strange deja vu feeling, I may have posted this last year Embarassed ). Worth watching a second time though thumbsup


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Interesting comment re F1 cars having an even greater rear biased weight distribution than a 911, that's 2 fingers up at those who say that the engine is in the wrong place
Razz Grin
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PostPosted: Thu Jun 27, 2013 9:11 pm    Post subject: Re: Video - The science behind cornering a GT2 RS Reply with quote

Roro wrote:


Interesting comment re F1 cars having an even greater rear biased weight distribution than a 911, that's 2 fingers up at those who say that the engine is in the wrong place
Razz Grin


Dream sequence complete, topics merged!

Still a worthy repost !
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Roro
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PostPosted: Thu Jun 27, 2013 9:15 pm    Post subject: Reply with quote

thumbsup
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MisterCorn
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PostPosted: Thu Jun 27, 2013 9:29 pm    Post subject: Re: Video - The science behind cornering a GT2 RS Reply with quote

911UK wrote:
Roro wrote:


Interesting comment re F1 cars having an even greater rear biased weight distribution than a 911, that's 2 fingers up at those who say that the engine is in the wrong place
Razz Grin


Dream sequence complete, topics merged!

Still a worthy repost !


Interesting comment, but AFAIK completely incorrect, from 2011 F1 rules won't allow more than something like 55% rear weight bias, it is controlled by the regs to within a percent or two.
We all know the engine is in the wrong place Very Happy

MC
 
  
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Roro
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PostPosted: Thu Jun 27, 2013 9:34 pm    Post subject: Reply with quote

... I'm in denial til the bitter end ... Grin
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p1rob
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PostPosted: Thu Jun 27, 2013 9:44 pm    Post subject: Re: Video - The science behind cornering a GT2 RS Reply with quote

Roro wrote:
.. Or any 911 really for that matter... good video.

(... Strange deja vu feeling, I may have posted this last year Embarassed ). Worth watching a second time though thumbsup


Open Youtube Page


Interesting comment re F1 cars having an even greater rear biased weight distribution than a 911, that's 2 fingers up at those who say that the engine is in the wrong place
Razz Grin


Great clip,what a car Bandit
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