I guess I have heard somewhere that the reason for the slightly quicker 0-60 for the tip over manual is that a driver can't shift the manual soon/quick enough to 2nd. Makes sense when looking at torque multiplier data. Torque multiplier = gear box ratio (x ) axle ratio. First gear manual 3.82(3.44) = 13.14 , and for tip 3.59(3.06) = 10.98. (torque converter adds some torque, but I think not much).

The manual has nearly 20% the twisting force at ft/rear wheels compared to what is available at flyweel than does tip. With such additional torque, the manual has got to have an initial jump on the tip.

Too bad the tt-rev limitation is so low 6800 or so. Given a 7300rpm, this would give the driver a bit more time (and road speed) to get the box into second. I wonder what damage could possibly be lurking with just a 500 blimp in rpm and why Porsche is being so overly careful in setting these tts at the 6800rpm. Suggestions?

Second gears multipliers are about the same manual 2.14(3.44) = 7.36 and tip 2.19 (3.06) = 6.70

 

The difference has been attributed to Brake Torquing. There is a Porsche press blurb somewhere explaining it and C&D did some launches to test the claims.

From Geneva Launch:


"Improvements to the Tiptronic S transmission in the latest 911 Turbo contribute to the performance gains by allowing an earlier ramp-up of boost pressure when 'brake-torquing' the transmission, and new tuning lets more torque accumulate while the brake pedal is held. Other improvements reduce the time required for the transmission to react to driver inputs, and produce quicker shifts.


If launched appropriately, a 911 Turbo equipped with Tiptronic S is essentially "pre-tensioned" at the starting line, and during acceleration runs, power-interruptions are reduced in comparison to the 6-speed manual transmission. Aiding acceleration, when paired with Tiptronic S, the all- wheel-drive system with PTM can deliver a nearly uninterrupted flow of torque to all four wheels.


The optimized interaction between the new all-wheel-drive system, Porsche Traction Management (PTM), Tiptronic S five-speed automatic transmission, and Tiptronic-specific calibration of the engine management controls and associated variable turbine geometry (VTG) system, allows the new 911 Turbo with Tiptronic S to accelerate slightly quicker than models equipped with the manual 6-speed transmission."


excerpt from C&D:

"Even with a conventional, torque-converter automatic, it's far from straightforward to extract the ridiculous numbers that the Turbo is capable of. First, remember that the latest Turbo has an overboost mode—it ups boost on the 3.6-liter flat-six by 2.9 psi, increasing torque from 460 pound-feet to 505 for 10 seconds when the dash-mounted "Sport" button is ticked and the throttle is pinned—so, to get the best launch, the brake torquing must happen with your right foot all the way to the floor.

With feet firmly planted on both pedals and the car starting to creep forward from the wave of torque, make sure the up-arrow illuminates in the boost-display window-the indication that overboost mode is activated-before releasing the brake.



If you've gotten it right, the tricky part is over and all 505 pound-feet of torque are unleashed, giving the driver an impressively harsh shove into the seat. During our testing, however, getting repeatable launches with in overboost mode proved difficult and those extra pounds of boost sat out about half the runs for no apparent reason."

 

Got ya...but it seems like a sure fire way of burning up some expensive tip components in short order.

 

That .2 seems to be an ego thing if anything at all. The car is flat out fast regardless of which transmission you choose.

 

the one thing that I dont like about the turbo is the fact that redline is so low. I came from an M3 and with software the redline was 8100. waaaay different getting used to driving with such a low redline.

 

Agree 100% especially 1st gear. I too came from M3s with high revving engines. I guess these turbos generate so much heat that Porsche to be sure holds back on rpm. When you floor it in first, you gotta shift...wait too long and your teeth can hit the steering wheel. I still think a 7300 would be OK, but probably would void warranty claims if problems. I have learned with a bit reluctancy to shift almost instantly when flooring the tt in first.

And too, remember back 01-03, BMW had to come off the 8100 redline because a lot of engines were being blown even with SMG and poor BMW tried vigorously, but couldn't blame drivers for a bad shift because SMGs protect against overrev mistaken shifts. I had one of those engines go bad. Incidentally, there is talk that the '09 v8 M3 will be turbo powered. I moved my '08 deposit to '09.