Last spring Pirrelli launched the latest evolution of their P Zero and P Zero Corsa tires. Apart from new and improved rubber see: http://blog.caranddriver.com/rubber...-p-zeros-30th-anniversary-debuts-new-version/ the tires now come with PNCS or Pirelli Noise Cancellation System see: http://www.pzero.com/en-us/technology#pnsc-section.
My car came equipped with the new PNCS model and recently I was complaining to my service director at McLaren that I was experiencing some wheel shake at high speed that felt like a wheel balancing issue. We discovered that the foam used to carry out the noise cancellation (spread as foam blocks inside the tire) is coming loose and bunching up effectively causing a wheel balancing issue. The shearing tends to happen after track sessions or on very hot days when the tire temps are high. I witnessed another tire yesterday while at McLaren where you can clearly see bunched up foam in one part of the inner tire.
As an aside I've tried 2 570s one with PNCS and one without, and I couldn't really hear the difference, but I'll bring a decibel meter next time.
Is anyone else running these latest Pirellis with PNCS experiencing the same issue?
My car came equipped with the new PNCS model and recently I was complaining to my service director at McLaren that I was experiencing some wheel shake at high speed that felt like a wheel balancing issue. We discovered that the foam used to carry out the noise cancellation (spread as foam blocks inside the tire) is coming loose and bunching up effectively causing a wheel balancing issue. The shearing tends to happen after track sessions or on very hot days when the tire temps are high. I witnessed another tire yesterday while at McLaren where you can clearly see bunched up foam in one part of the inner tire.
As an aside I've tried 2 570s one with PNCS and one without, and I couldn't really hear the difference, but I'll bring a decibel meter next time.
Is anyone else running these latest Pirellis with PNCS experiencing the same issue?