BMW 1 Series remap

The current F40-generation M135i runs the B48 2.0-litre turbo with xDrive as standard, and a two-roller dyno cannot load an xDrive car properly. It forces the car into a non-standard mode or leaves an axle disconnected, and neither produces a genuine figure. Our four-roller Bapro dyno loads all four wheels at once, the way xDrive actually sends drive to the road.

The earlier F20 M140i is a different car entirely under the badge, built around the B58 3.0-litre straight-six. In the UK it was sold rear-wheel drive only; xDrive was offered on the M140i in other European markets but was never brought to the UK. Whichever drivetrain your M140i has, the same four-roller rig is used, because a load-simulated pull produces a documented, repeatable figure rather than a road estimate, regardless of how many wheels are driven.

Stage 1 is available on both the current M135i and the earlier M140i, tailored to whichever engine is fitted. Stage 2 is available where supporting hardware suits the platform, and we will advise honestly rather than push it as standard. We remap the automatic gearbox alongside the engine on both generations, and a standalone rolling road session is available if you want a baseline pull without a full remap.