Motor Trend Talks to Michael Krumm About the Porsche 918

Michael Krumm, NISMO driver, and the man that lapped the Nurburgring in 7:08 with the R35 GT-R NISMO track pack/edition, talks with Motor Trend about the Porsche 918 and its 6:57 lap time.
Michael Krumm

2010 GT1 World Champion Michael Krumm managed to pedal the GT-R around the ring for that hero time mentioned above, but about a week before the GT-R’s time was released, Porsche proudly crowed that its 918 Spyder managed the job in 6:57. Michael has studied the in-car playbacks and notices that while the 918 was faster climbing up all the hills, and it frequently achieved higher top speeds on the straights, the GT-R cornered as quickly. He also noticed that toward the back half of the track, the split times were equalizing as the hybrid hypercar’s batteries eventually wore down. He also pointed out that that car was essentially running on grooved slicks. Fitting similar tires to the GT-R helped but did not equalize the cars’ performance. His observations raise the question: Which of these cars would be faster over two laps? The GT-R certainly won’t run out of gas before the 918 runs low on boost electricity, but will it run out of tire?
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The Porsche was equipped with the Weissach package. 77 lbs lighter, and some additional aerodynamic parts.

For very performance-oriented customers of the 918 Spyder, Porsche offers the "Weissach" package. These modified super sports cars can be recognized at first glance by special colors and designs that are based on legendary Porsche race cars. The roof, rear wings, rear-view mirrors and frames of the windscreen are made of visible carbon. Parts of the interior are upholstered with Alcantara instead of leather, and visible carbon replaces much of the aluminum. Sound insulation has been reduced. The emphasis on performance is not just visual: very lightweight magnesium wheels reduce unsprung masses; gross weight was reduced by about 77 lbs. The benefits are experienced in further improved dynamic performance. Other references from motorsport are six-point seatbelts for driver and front passenger, optional film-coating instead of body paint, as well as additional aerodynamic body parts in visible carbon.

The 918 was on the new Michelin Pilot Sport Cup 2 tires. Not a lot of information about the Sport Cup 2's, but the original Sport Cups were a 80 UTOQ treadwear tire. Very sticky, very fast tire. The Chevrolet Corvette ZR1 that ran the 7:19 Nurburgring time was on a set of Pilot Sport Cups.  The U.S. Department of Transportation (DOT) National Highway Traffic Safety Administration's (NHTSA) Uniform Tire Quality Grade Standards (UTQG) were originated to provide consumers with useful information to help them purchase tires based on their relative treadwear, traction and temperature capabilities.

The Dunlop SP Sport Maxx GT 600 DSST tire is a 200 UTOQ tire, but the new tire exclusive to the NISMO GT-R is said to be stickier. The Dunlop has been the quick tire on a GT-R since the car was released, but it is still a run flat street tire. Lots of GT-R owners run the Toyo R888 (non-runflat) as a street/track tire. They are 100 UTOQ tire, and a popular tire. GTROC from the UK did a test with a set of 285/315 Toyo R888, and this is what they had to say.  Some more information on wheels and tires for Nissan GT-R's.

Head over to Motor Trend to read about some of the additional modifications that the track edition of the NISMO had to run the 7:08 time.  Seems like these "Nur" specials are going to be the ones dominating the videos, and lap times of the future. 

Source: Motor Trend for Nissan Skyline GT-R and GT-R parts.

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Item Reviewed: Motor Trend Talks to Michael Krumm About the Porsche 918 Rating: 5 Reviewed By: Sean Morris