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Red Bull's Daniel Ricciardo says he is not expecting a drastic improvement from supplier Renault's upgraded Formula 1 engine, which is set to be available at Austin.



Ricciardo and team-mate Daniil Kvyat have taken a series of engine-change penalties this season as Renault has struggled for reliability and performance.



Red Bull and Renault's relationship has broken down over the course of the year, culminating in the pair deciding to end their association at the end of the season.



Ricciardo said Red Bull will take the updated power unit when it is available - but the team should not "get too crazy" about it.



"We'll take what we can get," said the Australian. "It's not going to be 40 horsepower.



"It's better than what we've got now, but I wouldn't get too crazy about it.



"I'll take it, but I don't think it's going to be worth half a second."



Ricciardo and Kvyat will need to take further penalties when Red Bull chooses to fit the upgraded power units.



When asked if he feels the update is worth taking a penalty for, Ricciardo said: "It depends how much it is.



"From what I've heard it's not that much, so it's on the cusp at the moment."



Last week, Renault head of trackside operations Remi Taffin said the French manufacturer is hoping to have completed the upgrade validation in time for the United States GP.



But when Red Bull boss Christian Horner was asked what he knew of the situation regarding the Renault upgrade, he said: "I'm a little bit in the dark as to when that might be.



"It won't be Sochi that's for sure."