Numbers don't make sense...
 

If a 997.2 C4S w/ PDK shows on several magazines as slightly quicker than a 997.2S w/PDK than how can a 991C2 w/PDK show on the Porsche site as slightly quicker than a 991C4 w/PDK. What would you guys guess as the 0-60 on a 2013 C4 w/PDk and Chrono really be?

Thanks

Just my 2 cents here.The 4 wheel drive may help at take off, but in the end, all things being equal, the C4 is always heavier than a C2 and has the same engine. You should logically always be faster (on the dry) with a C2, whether it is a 997 or a 991.

Maybe the new PDK is so good that the added traction of the all-wheel drive is not really needed and the added weight just slows it down.

eg9 has a point, something is strange:
c2 is _faster_ than c4: c2 4.2s vs c4 4.3s (pdk sport+ 0-60)
BUT
c2s is _slower_ than c4s: c2s 3.9s vs 3.8s (pdk sport+ 0-60)
This info is from the US website.

Perhaps the rear-wheels are sufficient to use the 350bhp whereas you really need all four wheels to exploit the 400bhp?

I would not trust numbers that close too heavily. I agree with SM_ATL (congrats on the Falcons by the way) stricktly on a logic assumption. Also, I question all the numbers that come from the Porsche engineers. After Ll, they think the next number after 997 is 991hilarious

That was supposed to be "after all...". iPad autocorrect issue. Sorry!

Agreed. Numbers that close generally aren't considered significant unless statistically verified (eg. an appropriately powered analysis of the average of something like thousands of runs in many different examples of the same cars).

If history is any indication, the "C4" models are usually the same from 0-60 as the C2, (a little more weight but better traction) but the C4's are usually a tick or two slower and trap a few MPH slower in the 1/4 mile,....the added weight plays on them here.

However with the advent of the 997.2 I believe Porsche has officially stated that the C4s are faster around any track compared to the C2s. I'm sure this will remain the same on the 991.

More, a C4 or C4S, are not full 4WD always on.
the 4x4 traction is not always present. It goes, for example, from a 100% rear - 0% front, t a 60% rear - 40% front and so on for example. It depends on how the car spare the traction depending on needs...

Anyway often 4wd are slower than 2wd. Wheigt, machanics, and other reason involved...

Wonder if PDCC is the key variable in the difference of numbers.

1ft rollouts by the magazines will help with this.

It really doesn't matter a whole lot but I did just check the Porsche USA site and the figures for PDK with Sport Plus for both the C2S and C4S are identical:

3.9 secs (PDK Sport Plus)

Their top speeds do vary C2S 187 mph, C4S 184 mph both pdk.

On a track I would say yes. In a straight line, I'm not sure.

Christophorus Aug/Sep 2012 has the following PDK 0-60 times:
C4: 4.5 sec
C4S: 4.1 sec

Where did the 3.8 sec and other data come from?

ChuckJ

Chuck, I got them by using the comparison tool, by comparing the C2S with the C4S (click on Compare Models on the left of the main page):

Top Track Speed 187 mph 184 mph
Acceleration 0 - 60 mph 4.1 sec (3.9 sec Sport Plus) 4.0 sec / 3.8 sec (PDK with Sport Plus)

See attached screenshot

But the data page for the C4S:
http://www.porsche.com/usa/models/91...turesandspecs/
says:
Acceleration 0 - 60 mph:
Manual: 4.3 sec
PDK: 4.1 sec / 3.9 sec (PDK with Sport Plus)

Clearly not very reliable.