BMW 3 Series ECU Remapping & Engine Tuning

Which 3 Series engines gain the most?

The E90 generation is where the 3 Series changed. It was the last with naturally aspirated petrol engines, and the E92 335i was the first 3 Series with a turbocharged petrol engine. Both sit in the same table. The 2007–2013 330i uses the naturally aspirated N53 3.0 six and goes from 272 to 287 bhp (+5%); the 335i’s twin-turbo N54, also 3.0 litres, goes from 306 to 351 bhp (+14%). The E9x M3’s naturally aspirated S65 4.0 V8 adds 25 bhp, from 420 to 445 bhp (+5%), while the F80 M3, with the twin-turbo S55 six, goes from 424 to 506 bhp (+19%).

Every F30 engine is turbocharged, and the B48 2.0 four-cylinder shows how much a lower-output turbo petrol can gain: in the 2015-on 320i it goes from 181 to 264 bhp (+45%), against 322 to 380 bhp (+18%) for the B58 six in the 340i.

The diesels are all turbocharged too, and some of the E90 sixes respond strongly. The 2006–2009 E90 325d goes from 197 to 277 bhp (+40%), and the twin-turbo N57 in the F30 335d from 309 to 375 bhp (+21%). For the G20, the 320d goes from 188 to 218 bhp (+15%); the 330d and the six-cylinder petrol are still in development.

3 Series generations we cover

E46 (1997–2006). Saloon, Touring, coupé, convertible and, from 2000 to 2004, the three-door Compact. Petrol engines include M43, N42 and N46 fours and M52 and M54 sixes; the M3 used the S54 3.2 six, and the M3 CSL a 360 PS version of it.

E90/E91/E92/E93 (2004–2013). Saloon, Touring, coupé and a convertible with a retractable hard top. The 335i moved from the twin-turbo N54 to the N55 twin-scroll single turbo in 2010.

F30/F31/F35 (from 2011). Saloon, Touring and a long-wheelbase F35 for China, and the first 3 Series sold only with turbocharged engines, from the N13 1.6 and B38 1.5 three-cylinder up to the N55 and B58 sixes.

G20/G21 (2018 onwards). Saloon and G21 Touring, facelifted in July 2022, with the B47 2.0 and B57 3.0 diesels and the B58 in the M340i.

Last updated 19 October 2026