Romain Grosjean has set his sights on taking the fight to Williams during this weekend's Canadian Grand Prix.
Lotus produced some eye-catching displays during Friday's practice sessions at Circuit Gilles Villeneuve with Grosjean third behind the Mercedes cars of Lewis Hamilton and Nico Rosberg in the morning and then P7 in the afternoon with the other Lotus of Pastor Maldonado P5.
It means Lotus were faster than Williams and Red Bull in both sessions and the Frenchman hopes they can stay there for the rest of the weekend.
"It was quite surprising to be P3 this morning, and this afternoon confirmed we are in a good shape, with P5 and P7," he said.
"The car feels great, Monaco was a step forward and here is much more in our direction, so there are a lot of positives today to try and get a good result tomorrow.
"I think realistically we can try and give some hard time to Williams, if not beat them. I'm sure there will be four cars quicker than us and if we can be close to the Williams or fight them that'd be pretty good."
Lotus' decision to move from Renault engines to Mercedes power units has certainly helped the team's cause in Montreal.
"It's a huge difference," Grosjean said when asked about the difference compared to 2014.
"Last year [with the Renault power unit] was one of the worst places for us, it was really inconsistent, so it's nice this year to enjoy a track that I love so much.
"Turn 1 and 2 is good fun whereas last year I was just trying to go around it."