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Red Bull consultant Helmut Marko says the outfit is waiting on results from Renault's different development approach, which should determine whether the partnership will be successful long-term.
Red Bull has endured a troublesome start to its 2015 campaign, currently sitting in fourth place in the Constructors' championship without a podium finish from the opening seven rounds.
"We knew that the Monaco result [fourth and fifth] did not reflect our real situation because in Monaco power is not that important," Marko told the Official F1 website.
"You saw it last weekend in Montreal [where Daniil Kvyat scored a best of ninth]: as soon as there is a long straight we lose out.
"We know that we have a handicap on the engine side, horsepower-wise. We are trying to adapt with really low downforce, low wing settings, but there is a limit to what you can achieve with that.
"Ferrari shows that it is possible to catch up in an ongoing season and Renault recognise now what they have to do. Development was obviously not going into the right direction.
"There are some steps coming, but we have to be patient. In three weeks from now we should know if the new project, which is on the dyno now, is working or not."
