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Formula 1 rookie Lando Norris says McLaren's 2019 car feels "completely different" to last year's car and that the mood within the team has "definitely" improved.

McLaren has responded to a dismal 2018 campaign with a shake-up of its design team and has begun testing with encouraging reliability and pace, with Norris setting the second fastest time behind Ferrari's Charles Leclerc on Tuesday.

Norris's team-mate Carlos Sainz has also expressed similar sentiments with McLaren's start to 2019 testing.

But Norris also warned that there are areas McLaren must improve.

"It's a completely different car to last year," said Norris, when asked by Autosport about whether the team had cured all the vices of its 2018 challenger.

"Overall, it feels very different in terms of aero to last year with the differences.

"Some things we have improved on from a car perspective, but there's a lot to work on and a lot of things we've learned in the last two days that we need to develop and improve on for the rest of the test, and also for the first race.

"It's hard to say if all the problems are gone, and there are still some things we struggle with.

"It's not a perfect car - but I think that between Carlos [Sainz] and myself we are reasonably happy with the way that things have felt so far."

Norris said that McLaren was using this week's test to experiment with set-ups to try to expose any weaknesses within the MCL34.

"I'm sure we will run into some problems at some point, but it's just making sure we can get through this whole test," Norris said.

"We know the problems that might come up so it's just about making sure we have them figured out before Australia.

"We wouldn't want them to pop up knowing we could have done something to fix them over the course of these next two weeks.

"It's good confidence for myself and for the team, knowing that there's not a lot to keep chasing up on and keep checking on.

"I think for the team it's nice they can be confident in getting through every run plan for each day."

Norris added that the mood at McLaren has improved.

"I definitely think it's an improvement from last year," he said.

"Obviously, I wasn't the driver last year so I wasn't as integrated as I am now, but in terms of seeing the motivation for everyone and the way that they work as a whole group and family, it definitely seems to be going in the right direction.

"It's not perfect, but I think that some of the problems that we have had and the niggles that we have had to overcome have been ironed out slowly, so it's just about making sure everyone is working in the right direction and in a positive way.

"It'll take a bit of time to get there completely, but everyone is very motivated and working extremely hard."