Toro Rosso team boss Franz Tost has warned Sauber that their decision to run year-old Ferrari engines in 2017 will put them at a “big disadvantage.”
Without an engine supplier for this year’s championship, Toro Rosso returned to Ferrari power but run the Scuderia’s late-spec 2015 engines.
While that served them well at the start of the campaign, as the year progressed and the engine manufacturers updated their power units, Toro Rosso fell further down the order.
Despite witnessing their rival’s trials, Sauber have opted to run year-old Ferrari engines in the 2017 championship.
The team, which has yet to score a point this season, made the desire based on a need to focus on their chassis development in light of the new 2017 rules.
Tost, though, has warned they will be a huge disadvantage because of it.
“I don’t know all the reasons and background stories why Sauber decided to go with this year’s engine,” he said.
“I wouldn’t like to be in this situation because it’s a big disadvantage on the performance side to run with last year’s engine.
“From the regulation side, I think it should be kept open because a one year old engine is most-often cheaper than the newest specification.
“Therefore the regulation should allow it. From the performance side the team anyway is disadvantaged.”