The 2014 Camaro Z/28 had a problem spinning its tires. Not doing traditional burnouts, mind, the rubber was actually rotating on the wheels. Well it did, until Chevrolet engineers noticed the vibration that it caused and fixed the flaw.

Chevy observed the issue while it was running laps of the Z/28 on a track. It claims that the Camaro's aggressive Pirelli P Zero Trofeo R tires and were generating so much traction that under braking, the rubber was actually slipping on their wheels. The engineers say that the car can develop 1.5 g of force under deceleration thanks to its Brembo carbon-ceramic brake rotors.

They initially suspected an issue with the tires or wheels, and the test was relatively simple. The engineers marked a chalk line relative to the valve stem and took the Camaro out for a lap. When it came back, they found that the Pirellis had rotated 360 degrees or more.

Of course, now Chevy had to fix it. Scroll down to watch a video of the Camaro Z/28's engineers explaining the problem and their novel solution, plus the press release about it. We have reached out to Chevy with some further questions but have yet to hear back. Look for an update to this post if and when we do.
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Camaro Z/28 Engineers Get a Grip on Wheel Slip

Tire grip, braking capability require action to prevent wheels rotating in tires

DETROIT – While running fast laps at several of the country's most challenging tracks, Camaro Z/28 engineers noticed the tires were providing so much traction and the brakes so much stopping force that the wheels rotated inside the tire – an unexpected challenge that required fast thinking.

"We were told to build a fast car – period," said Mark Stielow, Camaro Z/28 program manager and pro-touring expert. "We knew on Day One we'd need to bring some of the best suppliers onboard to make it happen."

The suppliers included Pirelli and its P Zero™ Trofeo R tires and Brembo for carbon-ceramic brake rotors. The Trofeo R tires have a track-oriented tread design and compound that, together with the carbon-ceramic rotors, help the Z/28 achieve up to 1.5 g in deceleration force.

It was a perfect combination, but engineers quickly found that when the Z/28's capability was tested, the wheels were rotating – slipping – inside the tires. They sought the root of the problem by marking one of the Pirelli P Zero™ Trofeo R tires at the beginning of a lap with a chalk line relative to the valve stem on the wheel. At the end of the lap, they recorded where the chalk line ended up and noticed the tire had rotated at least a full 360 degrees from where they started.

Racers use an abrasive paint around the bead of the wheel, where the tire meets the rim, to combat the problem on race cars. The Z/28's engineers tried it, but it wasn't strong enough to prevent the slippage, so other approaches were tried. Finally, they tried media blasting, which involves shooting a gritty material through an air gun at the wheel's surface, adding texture to the paint for the tire to grip.

"Media-blasting the wheel created an extremely aggressive grit on the rim, which finally got the tire to hold," said Stielow.

Along with the tires and brakes, some of the tire slip can also be attributed to the 7.0L LS7 engine helping spin the wheels with an SAE-certified 505 horsepower (376 kW) and 481 lb-ft of torque (652 Nm). While going around corners, the helical-gear limited-slip rear differential also sends power to the wheels so well that differences in tire slip can be observed from side to side on the rear axle.

The 2014 Camaro Z/28 arrives in dealerships this spring.

Founded in 1911 in Detroit, Chevrolet is now one of the world's largest car brands, doing business in more than 140 countries and selling more than 4.9 million cars and trucks a year. Chevrolet provides customers with fuel-efficient vehicles that feature spirited performance, expressive design, and high quality. More information on Chevrolet models can be found at www.chevrolet.com.


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    • 1 Second Ago
  • 110 Comments
      RevenantDC5
      • 9 Months Ago
      Others have had this figured for years. Enkei, for example, uses what they call a roulette pattern grooved on the rim to reduce the slippage ratio between tire and rim during extreme acceleration and deceleration. The roulette pattern is also used for McLaren Mercedes Formula One racing wheels.
      Joe
      • 9 Months Ago
      This has been a problem with drag racers for a long time. The solution is to screw the bead to the rim. This would not be a great solution on a street car, so the engineers devised a way of creating mor friction between the tire bead and the rim.
      j.matison
      • 9 Months Ago
      This story is just an embarrassment, especially for GM. They "never" encountered slippage before? REALLY? No, it's just a "we got big power" subliminal b.s. to make their point to 16 year olds. Worse, the writer almost presents this whole thing as a tongue in cheek exercise. Bremo isn't responsible for that 1.5 G deceleration, they're mostly about fade resistance in production cars. Stopping power is all in the tire selection, just like any car's 60-0 mph stopping distance. Full-on lock can be accomplished by any DOT approved brakes. If the anti-lock setup is really making a difference in G force, there is something GM needs to admit, which would be that their regular systems are as reliable as a $2 ignition lock.
      Will
      • 9 Months Ago
      If it rotated 360 degrees, how did they know it rotated at all?
      churchmotor
      • 9 Months Ago
      If only GM could engineer an ignition switch to hold the weight of two keys.
      Gerardo Mata
      • 9 Months Ago
      so much traction...so much power....and they overlooked the 'so much weight' section heh
      EvilTollMan
      • 9 Months Ago
      Have the engineers figured out a way to reduce the ugly?
        Bernard
        • 9 Months Ago
        @EvilTollMan
        Simple. They avoid your family gene pool and the problem solved itself...
        VDuB
        • 9 Months Ago
        @EvilTollMan
        LOL. Noice.
      bleexeo
      • 9 Months Ago
      Too. Damn. Heavy.
      Brodz
      • 9 Months Ago
      What an awesome vehicle. Stand proud Chevy Engineers.
      TedB
      • 9 Months Ago
      "When it came back, they found that the Pirellis had rotated 360 degrees or more." If the tires rotated 360 degrees...how would you tell? If they rotated 370 degrees, isn't it possible they rotated just 10 degrees? **confused**
        ELG
        • 9 Months Ago
        @TedB
        be easy on them, they got their educations in detroit
        Will
        • 9 Months Ago
        @TedB
        How did they know it wasn't 1090 degrees?
      GRR
      • 9 Months Ago
      The Camaro(metal car) is not grippy, its the tires, and many other cars can equipe this tires without this problem, the issue here is not the Camaro being grippy, but rather being too heavy
      alexkoolur
      • 9 Months Ago
      Great they fixed it. Now it's still over-priced and nowhere near as the C7 vette. Explain to me why anyone would buy this? Spare me the hillbilly who struck it big.
        jah-nay
        • 9 Months Ago
        @alexkoolur
        Other than the Z06 its faster around the track than a C7! ""The 2014 Chevrolet Camaro Z/28 has set a blistering lap time at the benchmark Nurburgring Nordschleife race track. The stripped down muscle car dispensed of the 154-turn, 12.9-mile-long circuit through Germany’s Eifel mountains in 7:37.47, putting it ahead of a list of notable exotic sports cars that includes the $100,000 Porsche 911 Carerra S, $240,000 Lamborghini Gallardo Superleggera and $400,000 Lexus LFA, not to mention the 556 hp Camaro ZL1 at 7:41."
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