B48 · 2.0 turbo four-cylinder

BMW B48 tuning

The B48 is BMW's 2.0-litre turbocharged four — the engine in the 320i, 330i, 420i, 430i, 530i and Z4 sDrive20i, and the petrol side of the 330e and 530e plug-in hybrids. It is far sharper than the badge suggests once it's properly mapped.

See the B48 chassis

B48 vehicles

BMW B48 tuning, by model

SamuelTuned covers B48 tuning and remapping across the BMW 320i (G20 / G21), BMW 330i (G20 / G21), BMW 330e (G20 / G21), BMW 420i (G22 / G23 / G26), BMW 430i (G22 / G23 / G26), BMW 530e (G30 / G31), BMW 530i (G30 / G31) and BMW Z4 sDrive20i (G29). Each one gets a custom, individually-calibrated remote ECU remap — Stage 1, Stage 2 and Stage 3. Open the configurator on your car to choose your stage, add the options that fit, and send the full build to Samuel.

G20 / G21

G20 320i

184 bhp stock

G20 320i Configure Tuning

G20 / G21

330i

255 bhp stock

330i Configure Tuning

G20 / G21

330e

288 bhp stock

330e Configure Tuning

G22 / G23 / G26

G22 420i

184 bhp stock

G22 420i Configure Tuning

G22 / G23 / G26

430i

255 bhp stock

430i Configure Tuning

G30 / G31

530e

288 bhp stock

530e Configure Tuning

G30 / G31

530i

248 bhp stock

530i Configure Tuning

G29

Z4 sDrive20i

197 bhp stock

Z4 sDrive20i Configure Tuning

Engine guide

BMW B48 tuning explained

More than the badge suggests

The B48 is heavily detuned from the factory across its many model variants for positioning and emissions. A custom tune frees up genuine, daily-usable performance — stronger mid-range, sharper throttle and a gearbox that responds the way it should. A 320i or 330i feels like a different car after Stage 1.

Custom calibration matters here

Because the B48 appears in so many states of tune, a generic file is a blunt instrument. Samuel maps each car to its exact variant, fuel and hardware from your datalogs — the safe, effective way to get the most from the 2.0 turbo. We also tune the ZF 8-speed alongside for the full step-change in feel.

330e / 530e plug-in hybrids

The 330e and 530e can't run xHP gearbox software, so we offer our own remote Custom TCU Tune for those cars (you'll need a Windows laptop and an ENET cable to flash it). The petrol B48 side is calibrated as normal for the platform.

Tune stages

B48 tuning stages: Stage 1, Stage 2 & Stage 3

Stage 1

Strong mid-range gain

Software only on stock hardware. Noticeably stronger and sharper everywhere.

Stage 2

Bigger top-end

Downpipe + intake where applicable for sustained delivery.

TCU tune

Faster shifts

ZF 8-speed via xHP — or our remote Custom TCU Tune on the 330e / 530e.

Figures are indicative and depend on the exact model, fuel and supporting hardware. Every tune is calibrated individually — open the configurator for your car for the precise build and price.

FAQ

B48 tuning, common questions

Definitely. The B48 is significantly detuned from the factory, so a custom Stage 1 delivers a genuine, daily-usable jump in mid-range and response — one of the most cost-effective tunes we do.

The petrol B48 is tuned as normal. For the gearbox, those PHEVs don't support xHP, so we offer our own remote Custom TCU Tune — you'll need a Windows laptop and an ENET cable to flash it.

Bootmod3, MHD and MG Flasher all cover the B48 depending on model and DME. Samuel will confirm the right one from your VIN.

No — Stage 1 is software only and flashed remotely. Hardware only comes in at Stage 2 if you want the bigger top-end.

Keep exploring