Renault’s power unit caused Max Verstappen’s temper to boil over in the third and final practice session for this weekend’s Singapore Grand Prix.
The Dutchman reported his Renault power unit was making “weird noises” just after the halfway point of Free Practice 3.
Moments after the first report, Verstappen vented his frustration at unexpected engine braking, commenting, “the engine is doing it’s own thing.”
“I get so angry with this,” Verstappen said.
Later in the session, Verstappen said the power unit was not “reacting” the way he was hoping.
Then, when his Red Bull engineer pushed him for more information, Verstappen said, “the product in the back of this car is not working in the way I want it to.”
The Red Bull driver was stuck in the garage for the first half of the session, for reasons that have not yet been confirmed.
Tensions between Renault and Red Bull have been high in 2018, following confirmation that Honda will supply Red Bull from next year.
Red Bull’s season has been marred by multiple mechanical failures. Most recently for Verstappen, he was forced to retire after five laps in the Hungarian Grand Prix because of an engine issue.
Verstappen finished Singapore’s third practice in P6, just behind his team-mate Daniel Ricciardo, who was a tenth ahead in P5.