Finally, PDK is absolutely consistent lap after lap.
![2008 porsche c4s sport chrono plus hp 2008 porsche c4s sport chrono plus hp](http://www.axisauto.ca/wp-content/uploads/2014/03/9756bb961c79582a3445f6b9458e61d6x.jpg)
Third, overall acceleration is quicker with PDK (Carrera S Coupe launches 0-60 mph in 4.5 sec with a manual, just 4.1 sec with PDK). Second, there is no tractive-force interruption with PDK (no measurable loss of power to the pavement).
2008 porsche c4s sport chrono plus hp manual#
First, the lightning-fast shifts with PDK best even the quickest manual or Tiptronic gear change (e.g., a 6th to 2nd shift took 1.05 sec with Tiptronic S – PDK drops it to just. Shake your head in disbelief, and then read on. In a complete reversal of trend, Porsche expects enthusiasts to prefer PDK over a traditional 6-speed manual transmission. At worst, it was a slow-shifting slushbox vehemently shunned by enthusiasts. Introduced nearly 20 years ago, Tiptronic was at best an electronically controlled transmission with a torque-converter. In "Sport Plus" mode, shifts are blindingly fast – they include a swift kick in the back with each upshift (Porsche engineers realize that hundredths of a second count on the track or in an autocross, so they didn't want to leave anything on the table). However, when the console-mounted "Sport" button is depressed, the shifts are accelerated to outpace in speed and feel those of the even sportier Tiptronic S.
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The PDK in standard mode shifts smoother than the outgoing Tiptronic. It can also be completely automatic as engine electronics shift gears based on engine speed, engine load and vehicle speed. Gear selection is done manually via twin sliding levers on the steering wheel (push forward to upshift, pull back to downshift) or with the console-mounted shift lever. As one clutch pack is engaged, the other disengages the previous gear and readies itself for the next shift (up or down). One multi-plate clutch pack controls the odd gears (and reverse), and the other controls the even gears. Technically speaking, the new PDK is a conventional 7-speed manual gearbox with two electronically-controlled clutch packs. The Tiptronic (a traditional slushbox) is now gone from the 911 lineup for 2009, completely replaced by the new PDK. While it may seem that Porsche is the last to the game with a direct-shift gearbox, the automaker politely reminds everyone that it introduced the world's first PDK in the Porsche 956 in 1983, and won in the Supercup at Nürburgring in the PDK-equipped Porsche 962 the following year. It's officially called the "Porsche-Doppelkupplungsgetriebe" (German for "double-clutch transmission"), but we'll stick with the acronym "PDK" for brevity.
![2008 porsche c4s sport chrono plus hp 2008 porsche c4s sport chrono plus hp](https://www.sloanmotorcars.com/wp-content/uploads/2016/03/4301_web-1104x677.jpg)
Despite their increased horsepower and torque, the LEV-II certified engines also deliver about 10 percent better fuel economy.Ĭonnected to the front of the engine (that's where it goes in a rear-engine 911) is an all-new electronically-controlled double-clutch transmission. Compared to their predecessors, the new engines also weigh about 13 pounds less. Under the rear deck lid of the standard 2009 Carrera is a 3.6-liter (3614 cc) flat-6 now rated at 345 hp and 288 lb-ft, while the Carrera S receives a larger 3.8-liter (3800 cc) flat-6 rated at 385 hp and 310 lb-ft.
![2008 porsche c4s sport chrono plus hp 2008 porsche c4s sport chrono plus hp](https://www.corcars.com/sites/default/files/styles/colorbox/public/vehicle-images/2017/12/Porsche2009911CarreraS_722454_03.jpg)
Both engines also boast Porsche's VarioCam Plus intake-valve timing and lift system. The essentially all-new engines feature direct fuel injection, two-piece crankcases, and revised intake and exhaust systems. Still striving to perfect its unique 6-cylinder boxer, the German automaker burned the midnight oil to completely rework the powerplants for 2009 (don't be misled by the countless uninformed sources who attribute the bump in horsepower solely to the new direct injection). The Carrera S was fitted with a slightly more powerful 3.8-liter (3824 cc) flat-6 rated at 355 hp and 295 lb-ft. Last year, the standard 2008 Carrera offered a 3.6-liter (3596 cc) flat-6 rated at 325 hp and 273 lb-ft of torque.