Monday, March 31, 2008
GTR Break-in Procedure
Kazutoshi Mizuno, Nissan’s project leader and self proclaimed ‘Mr. GTR’ wanted to ensure that every GTR be capable of the performance claims they’ve made and to keep themselves honest, each car goes out for nine laps on a test loop on the proving ground at the Tochigi plant facility. The loop itself isn’t a picturesque road course or even a high speed wailing on the banking, but instead looks like a multi-lane drag strip with different lanes with different road qualities. The goal is to properly and uniformly break in the various systems on the car. The procedure is well orchestrated, with the first four laps consisting of a set number of progressively harder stops and a little brake and throttle at the same time to properly break in the massive rotors and bed the pads. Laps five to seven focus on checking turbo boost and loosening up the transmission, and the final laps take the GTR on a bumpier section of pavement to reduce the friction in the suspension bushings. After the drive, each car is measured at several key points, and the alignment specs are re-checked and adjusted if needed. Nissan doesn’t want any funny vibrations at 300kph!