Sauber will not use Ferrari's updated engine at the Canadian Grand Prix and will instead wait until the Belgian Grand Prix to introduce upgrades.
Ferrari spent three of its remaining 10 performance tokens ahead of the Canadian Grand Prix and is expected to run the upgraded power unit in Montreal this weekend. Sauber, however, will wait until Spa-Francorchamps, which is also a high-speed track, as it does not want to use another of its allocation of four power units to access the upgrades.
Although it may seem strange not to take the more powerful engine this weekend, Kaltenborn said Sauber is waiting on further upgrades from Ferrari to make the most of taking its third engine of the season for each car. She also denied it was a financial decision.
"It's nothing to do with finances," she said. "That's the strategy that has been chosen on when you want to introduce what and what engine you want to use. First of all it is about when you want to use a new engine. We are now on our second engine, they are taking their third engine. Obviously they have a different strategy because if needs be they can return to an old engine.
"That's a different approach to things and the second thing is that the development is ongoing and Spa is a race where it really matters. Here, we are more or less fine and the next one coming it is also alright, but Spa and Monza are definitely the ones where you can really feel the upgrades. Maybe there is more to come."