Max Verstappen says only time will tell if Red Bull's divorce from Renault will pay off as his Toro Rosso squad are linked to a Ferrari engine supply deal for 2016.

Red Bull and Toro Rosso are set to complete a split from the French engine manufacturer at the end of the season after a difficult couple of seasons. Both teams are yet to secure a new power unit supplier with Mercedes point-blank refusing while Ferrari has offered a customer package similar to the one provided to Sauber and Haas.

The 18-year-old says nobody knows if it is the right decision by the team to cease its partnership with Renault but says the F1 world championship is about who has the best power unit rather than overall car package.

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"With Red Bull if you compared the years before the hybrid engines it was not really an engine championship, it was a car championship," Verstappen said. "The last few years is more about the engine than the car performance - they became world champion. Everyone knows the struggles Renault had and has but we have to wait and see if it was the right decision, we don't know yet."

Despite Toro Rosso's power unit headaches it has been one of the most successful F1 campaigns in the team's history since being rebranded from Minardi in 2005. Verstappen feels most of the achievements are down to the STR10 and it could have excelled even further if it didn't have to compromise with a lack of top-end speed.

"I think we also built the best car of Toro Rosso so far, so that's a great help," he explained. "It was not too bad but we were still missing top speed. I think our car was performing really well in Singapore and you always want more top speed. So if we had a bit more top speed we could also add a bit more downforce to the car and then it would get a bit easier."