BMW 3 Series (E46) 1998-2005 328i 193bhp Stage 1 Eco remap figures

Who is the Stage 1 Eco map for?

• Naturally aspirated owners who want a little more response and a more efficient, relaxed drive. Every map we list stays above standard.
• Drivers who want the small gain on offer without chasing peak output.
• Anyone who would otherwise take the full Stage 1 map but wants it tuned with economy in mind.

How Stage 1 Eco compares with Stage 1

Full Stage 1 on this BMW 3 Series is expected to give 213bhp and 309Nm (+20bhp, +30Nm). The Stage 1 Eco keeps about 75% of that power gain and 93% of the torque gain, so you get 208bhp and 307Nm: 5bhp less and 2Nm less than Stage 1, with the map shaped for efficient, relaxed driving, so it suits you if you want the pull and care about running costs. Both sit above the standard 193bhp and 279Nm.

What this means for your 3 Series

Naturally aspirated petrol engines have no boost to raise, so gains from software alone are more modest than on a turbocharged car and come from fuelling, ignition and throttle response.

Engine management is by a Siemens MS43 unit. Older engine management is simpler to work with, but age matters: worn sensors, leaks and tired components can hold back what a remap delivers, which is why we run a diagnostic check first.

We remap at our Belgrave Gate workshop in Leicester, or at your home or work within 30 miles, and every job starts with a diagnostic check.

Please note: these are expected figures, not guarantees. Real results vary with the condition of the vehicle, the ECU software version, fuel quality and the hardware fitted. Some options - including Stage 2 and anything that needs extra hardware - are for off-road or competition use only. We check every vehicle first and confirm what is achievable before any work starts.

Figures reviewed 22 October 2026.