McLaren, AlphaTauri and Alfa Romeo all have significant upgrades as most teams bring new parts for the start of Formula 1’s flyway races in Singapore. As explained by Lando Norris on Thursday, McLaren has brought a raft of upgrades that are the biggest set of developments since it made a major step forward in Austria earlier this year. The new parts target the car’s performance in low-speed corners, and relate to the front wing endplates, sidepods and engine cover, a fully revised floor, Halo, rear brake ducts, rear suspension, rear wing endplates and beam wing. Only Norris will run all…