2015 gt 6r80 when on my way to the track i can pull 1st to 7500rpm im s mode all day. When i get to the track and have the car in s mode it shifts a t 6700 rpm . car cools down 30 mims before trying again and samething .would like to know whats goin on ,think i would have better times if this wasnt happening . Also is a 2.0 60 the besy i can get out of it