Adrian Sutil says that Sauber's form in this weekend's Malaysian Grand Prix will provide the team with information on the strengths of the C33.
Sutil finished the season-opening Australian Grand Prix in 11th place and the German says that Sepang is a good barometer for the remainder of 2014.
"The track consists of many fast turns, long straights and a few hairpins, which make it quite an interesting one," he said.
"I am curious to drive the car on this track where the aerodynamics play a huge role. This is important in order to get to know where we stand. If a car is good in Sepang, then it will be fast on other tracks as well.
"You need everything here – good aerodynamics, grip in the corners and high speed on the straights. The aerodynamic efficiency of the car is a key. Generally, my hope is that we improve from race to race. In Malaysia, the main objective is to get better and to make a step forward."
Team-mate Esteban Gutierrez is hopeful that Sauber can make progress with the brakes on the C33.
"It can give us a better feeling when braking, which is where we were struggling quite a lot during the whole weekend in Melbourne," said the Mexican. "The track has several high speed corners where we will be able to evaluate our downforce and see what the balance of the car is like. Also, the set-up is quite different. It is a fact that we are not happy yet with our performance."