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C&D - Instrumented Test

 
Old 07-12-2019, 11:29 AM
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TheStanman
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Default C&D - Instrumented Test

Car and Driver posted their instrumented test of the 992. Good performance all around.

C/D TEST RESULTS
Zero to 60 mph: 3.0 sec
Zero to 100 mph: 7.2 sec
Zero to 130 mph: 12.4 sec
Rolling start, 5–60 mph: 4.2 sec
Top gear, 30–50 mph: 2.2 sec
Top gear, 50–70 mph: 2.6 sec
Standing ¼-mile: 11.3 sec @ 125 mph
Top speed (drag limited, mfr's claim): 191 mph
Braking, 70–0 mph: 140 ft
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Old 07-12-2019, 11:39 AM
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Sam Dickson
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How could a rolling start 5-60 mph take almost half again longer than from a dead stop?
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Old 07-12-2019, 11:44 AM
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Originally Posted by Sam Dickson View Post
How could a rolling start 5-60 mph take almost half again longer than from a dead stop?
Rolling start you're not in boost and not revved up like you would be with a launch control start.
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Old 07-12-2019, 05:00 PM
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Here is the actual C&D review. In it they mention why rolling start is 1.2 secs slower (4.2 vs 3.0) than launch control for 0-60mph. Also note it is a German spec 992 S being tested.

https://www.caranddriver.com/reviews...y-the-numbers/
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Old 07-12-2019, 05:12 PM
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Hmm, my 991.2 c2s 5-60 is 3.9 sec... C and D numbers.
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Old 07-12-2019, 05:20 PM
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Also, you need to keep in mind that the US is unique in how it records 0-60 times. The time is not from a complete dead stop.

Rather, it allows for a 1 foot rollout which the ROW does not. This adds at least 0.3-0.5 of a second to the 0-60 time. If the time was genuinely recorded from a dead stop then it would be more like 3.3-3.5 secs.
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Old 07-12-2019, 05:48 PM
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Originally Posted by Chris3963 View Post
Also, you need to keep in mind that the US is unique in how it records 0-60 times. The time is not from a complete dead stop.

Rather, it allows for a 1 foot rollout which the ROW does not. This adds at least 0.3-0.5 of a second to the 0-60 time. If the time was genuinely recorded from a dead stop then it would be more like 3.3-3.5 secs.
I checked this out and you are right. I thought it was just motortrend that did that, but it seems all US publications do that. Seems like cheating. with foot you are probably testing 5-60
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Old 07-13-2019, 07:11 AM
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I'm amused at how they refer to the 991.2 GTS as "the old GTS". lol
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Old 07-13-2019, 11:17 AM
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Originally Posted by stealthpilot View Post
I checked this out and you are right. I thought it was just motortrend that did that, but it seems all US publications do that. Seems like cheating. with foot you are probably testing 5-60
This is done so that the quarter-mile times match what you would get a drag strip, where you get about a foot of rollout from the staging lights. Once you start using the rollout for the quarter-mile, you have to use it for everything to avoid any inconsistencies.

Europeans don't care about this because they don't have any drag strip heritage.

5-60 rolling start was developed to simulate a more real-world launch because few owners are willing to perform the 6000-rpm clutch drops that used to be required to extract maximum acceleration from older Porsches on the street. Developing a more moderate clutch drop that could be replicated consistently proved impossible, so the solution was to put the car in first gear, drive at a steady 5 mph, and then go full throttle and shift for maximum performance until 60.
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Old 07-13-2019, 04:02 PM
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Originally Posted by iliveoncaffiene View Post
Rolling start you're not in boost and not revved up like you would be with a launch control start.
Indeed, rolling start is meant to simulate 'real world' acceleration, which sometimes can expose a turbo heavy engine...
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Old 07-13-2019, 05:55 PM
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Confused. How would the foot of rollout better replicate 0-60 if, presumably, you can’t use the launch control while rolling? Or, can you use LC by letting off the brake only slightly for that first foot? Need help understanding.
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Old 07-13-2019, 06:06 PM
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So much expertise, so much confusion.
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Old 07-13-2019, 08:58 PM
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Originally Posted by chance6 View Post
Indeed, rolling start is meant to simulate 'real world' acceleration, which sometimes can expose a turbo heavy engine...
Precisely. According to Car and Driver tests, the 991.2 GTS 0-60 (with the rollout) measured 3.4 seconds, while the 5-60 rolling start was 4.6 seconds.

Meanwhile, a C7 Corvette with the automatic did 0-60 in 3.7, while the 5-60 rolling start was only slightly slower at 3.9 seconds.

This, of course, is the worst case comparison, turbo/manual versus big NA V-8/auto. But it shows than any idiot can get the Corvette under 4.0 seconds by simply mashing the throttle to the floor. Achieving a similar time with the GT manual requires a degree of clutch slip and speedy shifting that might be beyond the abilities of willingness of many drivers.
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Old 07-13-2019, 09:25 PM
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Originally Posted by Valvefloat991 View Post
Precisely. According to Car and Driver tests, the 991.2 GTS 0-60 (with the rollout) measured 3.4 seconds, while the 5-60 rolling start was 4.6 seconds.

Meanwhile, a C7 Corvette with the automatic did 0-60 in 3.7, while the 5-60 rolling start was only slightly slower at 3.9 seconds.

This, of course, is the worst case comparison, turbo/manual versus big NA V-8/auto. But it shows than any idiot can get the Corvette under 4.0 seconds by simply mashing the throttle to the floor. Achieving a similar time with the GT manual requires a degree of clutch slip and speedy shifting that might be beyond the abilities of willingness of many drivers.
Yep, one should look at the delta between 0-60 and 5-60 rollout and really decide which is more applicable to what they want. I think the 991.1 GTS PDK had 3.6 sec 0-60 and the 5-60 rollout was 4.2 sec.
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Old 07-14-2019, 11:08 AM
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Wait, aren't the "5-60", and the "0-60 with one foot of rollout" two different things? And isn't 5-60, simply 5-60 (i.e accelerating from a constant 5, then flooring it up to 60, without a so-called rollout)? Either wires are crossed here, or I'm totally confused, which is entirely possible.
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