Game of Thrones

Also from Issue 218

  • Shark Werks 540-hp GT3 RS 4.1
  • Technical primer on road wheels
  • Porsche and the English Patient
  • Ed Mayo builds an early 911 hot-rod
  • David Stone: Unsung hero of the Monte
  • Recreation of the 1968 Monte Carlo winner
  • Project 911, Part 3: Engine
  • Dennis Simanaitis on racing and horns
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While TechArt is best known for its wild 911 Turbo and GT2-based GT Street creations, they do sell an awful lot of Cayenne-based conversions. As the Cayenne Diesel is such a big seller in Europe, TechArt decided to bring along a Cayenne Diesel S to prove how fast a big oil-burner can be.

There is nothing you can do to the 3.0-liter V6-engined Cayenne Diesel that would be impressive at Nardó, but the 4.2-liter V8-engined Cayenne S Diesel is another game altogether. TechArt’s engine conversion takes the motor from 382 hp to 450 hp, and its already impressive 850 Nm (626.93 lb-ft) of twist becomes a nice, even 1,000 Nm (737.56 lb-ft). The result is a 2.2-ton SUV that rockets to 100 km/h (62 mph) in just 5.2 sec and on to a claimed 270km/h (167.77-mph) top speed while maintaining good fuel economy—in normal driving, of course.

On the first day, the TechArt Cayenne S Diesel ran to 277.5 km/h (172.43 mph), exceeding both its claimed top speed and the stock 252 km/h (156.58 mph) quite significantly. On its second run, the SUV achieved an impressive 280.70 km/h (174.42 mph) to snatch the title of fastest diesel SUV.

All the tuners provided full specifications for their cars, and one of the interesting results of the event was how close the cars got to their claimed top speeds despite tire scrub on the banking.

For a car capable of 300 km/h (186 mph), you can normally factor in around 10 km/h (6.2 mph) for tire scrub. The tuners had all established their top speed claims based on runs on a flat autobahn, so the fact that many of the cars came very close to their claimed top speeds on the banking was all the more creditable.

A handful of the faster cars at this event were running on Continental Sport Contact Vmax tires, which are officially rated to 360 km/h. The others wore the Sport Contact 5P or Force Contact trackday rubber.

On relatively light cars like the Porsche 911, such speeds are not an issue, but when you are talking about tons of Cayenne, that kind of velocity puts a serious strain on any tire. Thus, the 22-in. wheels of the TechArt Cayenne were shod in 275/35ZR22s with a variant of the Vmax tire called Conti Cross Contact LX Sport, designed for heavy, high-performance SUVs like this one.

Conti says its ultra-high-speed tires have a specially designed structure and tread pattern that delivers high levels of stability at speed while breaking up resonances. The Continental Sport Contact Vmax holds the Guinness Book of Records mark for the fastest road-legal production tire, and there are very few places left on the planet where you can explore its outer limits. Nardó is one

of them.

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