BMW Z3 ECU Remapping & Engine Tuning

Which Z3 engines gain the most?

Every Z3 we list is a petrol straight-six, including the entry-level 2.0, which uses the M52TUB20 rather than a four-cylinder. With no diesel in our list, the differences in our figures come down to where each engine starts.

The 2.0 gains the most in percentage terms, going from 150 to 166 bhp (+10%) and from 190 to 210 Nm. The 2.8, with the larger M52TUB28 six, goes from 193 to 204 bhp (+5%), with torque rising from 280 to 310 Nm. The 3.2 M Roadster, the most powerful engine in the range, goes from 321 to 339 bhp (+5%) and from 350 to 380 Nm.

Across the four engines we list, the gain is between 11 and 18 bhp. The torque figures are worth reading alongside the power: the 2.8 gains 30 Nm (+10%), twice its percentage gain in bhp.

Z3 generations we cover

Z3 (1995–2002). The Z3 was built from September 1995 to June 2002 as the E36/7 roadster and the E36/8 coupé. The coupé was offered only with the 2.8, 3.0i and M engines. The 2.0 and 2.8 used M52TU sixes, the 3.0i the M54B30, and the M Roadster and M Coupé a 3.2 straight-six: the S50B32 in earlier cars and the S54B32 from 2001. In the US, M models used a different engine, the S52, until 2000.

Last updated 19 October 2026