BMW 2 Series ECU Remapping & Engine Tuning

Which 2 Series engines gain the most?

Every 2 Series engine we list is turbocharged, so the differences here come from engine size and how much power each version already makes as standard. The B48 2.0 four-cylinder is the clearest example. In the 220i it makes 189 bhp and goes to 263 bhp (+39%); in the 230i the same engine already makes 248 bhp and goes to 300 bhp (+20%). The lower-output version has more in reserve, so it gains nearly twice as much in percentage terms.

The B38 1.5 three-cylinder in the 218i goes from 134 to 176 bhp (+31%) and from 220 to 268 Nm. At the top of the range, the 3.0 straight-sixes start from much higher outputs: the M235i’s N55 goes from 322 to 377 bhp (+17%) and the M240i’s B58 from 335 to 385 bhp (+14%), still worth 55 and 50 bhp.

The diesels follow the same rule. The 2015-on 218d, with the B47 2.0, goes from 148 to 185 bhp (+25%), while the 225d, which uses a twin-turbo version of the 2.0 four-cylinder, starts at 215 bhp and reaches 257 bhp (+19%).

2 Series generations we cover

F22/F23 and F45/F46 (2013–2021). Our figures cover the F22 coupé (2013–2021) and F23 convertible (2014–2021), plus the F45 Active Tourer five-door (2014–2021) and the longer-wheelbase, three-row F46 Gran Tourer (2015–2021). Petrol engines run from the B38 1.5 three-cylinder in the 216i and 218i, through the N20 2.0 (2014–2016) and its B48 replacement in the 220i, to the N55 in the M235i and the B58 in the M240i. The diesels moved from the N47 2.0 to the B47 2.0 in 2015, and the 225d used twin turbochargers with both.

Last updated 19 October 2026