Korean GP: Sauber Friday quotes

Sergio Perez = 15th/15th: "For me the first session went quite well but then in the second session I lost a lot of track time because of a technical problem. I just had no engine power anymore and had to stop on the track. That was why I could not complete my programme and haven't done any long runs on either tyre compound yet so it is too early to say what we can do here. Nevertheless I am very confident for the remainder of the weekend."

Giampaolo Dall'Ara, head of track engineering: "Unfortunately we have lost half of the second session on Sergio's car because of a problem with the engine management. With Kamui's car we didn't have any reliability issues but performance-wise we have to improve. We need to get a better understanding of a few things and decide what to do. Generally speaking the soft tyre compound is definitely the better one for us. We have to look deeper into the data to find solutions on how to manage the super-softs."