This Porsche 993 Has a PDK Transmission
Porsche 993 PDK Transmission
Dutch shop KC Performance does restomods a bit differently. Their founder explains how it got a PDK into an air-cooled 911.
Just about everyone and their mother makes a Porsche 911 restomod, most following the template set out by Singer, blending modern engineering with absolute reverence for the past. But over in the Netherlands, KC Performance does something different. It built a 993 with a PDK transmission.
And this isn’t a full drivetrain swap. Their 993 retains its original air-cooled flat-six, albeit modified both to work with the new transmission. KC Performance builds all sorts of restomods beyond Porsches for individual customers, but it also works with other shops. Its experience doing modern electronics for air-cooled 911 engines took it down this particular path.
Kazimir von Hooijdonk, one of the co-founders of KC Performance, felt that some higher-powered old 911s left a bit to be desired. When you go up in power, you need a stronger clutch, and almost invariably that means a heavier pedal action. He’s not a fan, and he suspects customers aren’t either.
Still, there’s a lot more to the project than just bolting everything together, and this is where KC Performance’s expertise helps. In addition to the electronic throttle, KC Performance fits the engine with modern fuel injection and electronic ignition, plus a handful of other sensors. An aftermarket ECU running a custom map directs the conversations between the engine and transmission. This obviously enables the whole system to work, but it also provides for a ton of flexibility. You can make “comfort” and “sport” throttle maps, and if you ditch the stock Porsche transmission controller, you even set up how the transmission itself shifts.
“If you look at the gearbox in [a GT3 RS] car, they slam it in gear. We can do the same thing,” von Hooijdonk says. On the flipside, KC Performance can also make shifts feel as smooth as those in a regular 911 Carrera.
If you want a stock look, KC Performance can make the system work with the original Tiptronic gear lever, or fit the more modern PDK lever. You can shift manually with the Tiptronic rocker switches on the steering wheel, too.
Porsche 993 With PDK
The PDK also opens up some interesting possibilities. All that extra hardware added to the engine enables the use of modern traction control, and the shorter ratios of the seven-speed gearbox can influence engine tuning. While KC Performance did its first PDK conversion with a 993—Von Hooijonk’s favorite of all the air-cooled 911s for its modernity—any air-cooled 911 can be so equipped. The shop is even building an all-wheel drive 930 Turbo with PDK for a client, and that car will even get the ABS system off a BMW E46 M3.
It took KC 1,500 hours to realize this first PDK swap, but now that the hard work has been done, future cars will take far less time. Von Hooijdonk says that even creating engine and transmission maps should only take a couple hours on the dyno, since KC Performance already has a baseline to work with thanks to this 993. Still, it’s not cheap. Figure around €50,000, depending on how you want it configured.
Porsche 993 With PDK
At the end of the day, it’s about drivability. “I think the difference between us and a lot of companies is that we want you to be able to hammer [the car] all day, every day and drive it to work without fail,” von Hooijdonk says.
The company prides itself on the unusual, too. Plenty of restomod shops can take off-the-shelf parts and put them in an old chassis and call it good. KC Performance does real R&D.
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