A teenager will face court after he allegedly sped at more than 200km/h through Sydney's north then led police on a pursuit while drink-driving.

Police siad they clocked the 18-year-old Chinese national's black Lexus at 205km/h in an 80km/h zone on the Warringah Freeway at North Sydney, about 6.50am on Sunday.

Police followed the car as it sped along Willoughby Road then activated their lights and sirens and pursued the car on local roads, before it stopped on Penshurst Street.

The teen's 18-year-old girlfriend, who was a passenger in the car, was arrested after she allegedly assaulted officers who were handcuffing the driver.

Police allege they found a machete and a 30-centimetre metal blade under the driver's seat.

The pair were taken to Chatswood police station, where police said the driver blew an alcohol reading of 0.137.

He has been charged with speeding by more than 45km/h, driving at a dangerous speed, police pursuit and mid-range drink-driving.

His authority to drive in NSW on his Chinese driver's licence has been suspended.

His girlfriend was charged with assaulting and hindering police.

The pair will appear at Downing Centre Local Court on January 30.

AAP