Speaking about the strengths and weakness of the team this year, Norris highlighted the difficulty he sometimes has with the car during a weekend.
"Our strength is teamwork, it's really good at the moment," he said. "Weaknesses are slow-speed corners, the car doesn't like slow-speed corners and it hasn't done pretty much the whole year.
"That's where we lose our lap time. And mistakes, whether it's in the pit stops or not putting a lap together in qualifying.
"The car isn't always the easiest to drive and out together, so it's easy to make a mistake and we can quite often be out in Q1 or Q2."
McLaren is currently fourth in the constructors' championship, holding a 34 point lead over Renault for the 'best of the rest' position.
As the team looks to hold onto fourth place, which would be its highest finishing position in the standings since 2013, Norris added that there will be minor upgrades in the remaining races.
"I'm sure there'll be some things, but nothing extreme. There's already from halfway through the season that they're trying to figure out for next year."