S58 · 3.0 twin-turbo inline-six

BMW S58 tuning

The S58 is BMW M's current 3.0-litre twin-turbo straight-six — the closed-deck, high-pressure-fuelling engine behind the G80 M3, G82 M4, G87 M2 and the X3 M / X4 M. It is one of the most responsive platforms on the market to a custom tune.

See the S58 chassis

S58 vehicles

BMW S58 tuning, by model

SamuelTuned covers S58 tuning and remapping across the BMW M2 (G87), BMW M3 (G80 / G81), BMW M3 CS (G80) (G80), BMW M4 (G82 / G83), BMW M4 CS (G82) (G82), BMW X3 M (F97) and BMW X4 M (F98). 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.

G87

460 bhp stock

M2 Configure Tuning

G80 / G81

503 bhp stock

M3 Configure Tuning

G80

M3 CS (G80)

550 bhp stock

M3 CS (G80) Configure Tuning

G82 / G83

503 bhp stock

M4 Configure Tuning

G82

M4 CS (G82)

550 bhp stock

M4 CS (G82) Configure Tuning

F97

X3 M

503 bhp stock

X3 M Configure Tuning

F98

X4 M

503 bhp stock

X4 M Configure Tuning

Engine guide

BMW S58 tuning explained

What the S58 responds to

The S58 leaves the factory deliberately conservative on boost and timing to protect warranty and meet emissions. A custom calibration unlocks that headroom: more boost held for longer, optimised timing and fuelling, faster torque delivery and a transmission that holds gears the way you'd expect from an M car. Stage 1 is software-only on stock hardware; the gains scale hard once you add a downpipe and let it breathe.

Why a custom S58 map beats off-the-shelf

Every S58 reads slightly differently — fuel quality, intake and exhaust hardware, ambient temperature and your goals all change the right map. Samuel calibrates each S58 individually against your datalogs rather than flashing a generic file, so the tune is matched to your exact car and the fuel you actually run. Flex-fuel (E85) builds in particular need bespoke fuelling that no OTS map can safely cover.

Hardware path

Stage 1 needs nothing but software. Stage 2 wants a downpipe (OPF/GPF delete where legal for your market) and benefits from an upgraded intake and charge cooling. For E85 you add a flex-fuel kit and Samuel builds a dedicated ethanol map. Beyond that, the S58 takes upgraded turbos for genuine big-power builds — at which point the calibration is fully bespoke around your hardware.

Tune stages

S58 tuning stages: Stage 1, Stage 2 & Stage 3

Stage 1

~550–590 bhp

Software only on stock hardware. Sharper throttle, more mid-range, quicker shifts.

Stage 2

~600–640 bhp

Downpipe + intake/charge-cooling. Bigger top-end and sustained boost.

E85 flex

650+ bhp

Flex-fuel kit + dedicated ethanol map. The biggest gain per pound on the S58.

Big turbo

Quoted per build

Upgraded turbos + supporting fuel. Fully bespoke calibration.

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

S58 tuning, common questions

On a stock S58, Stage 1 typically lands around 550–590 bhp depending on the exact model, fuel and conditions. It's software-only — no hardware required — and is flashed remotely.

Bootmod3 and MHD both fully support the S58. Samuel will recommend the right one for your car and goals, and the gearbox can be tuned alongside with xHP.

No — Stage 1 runs on completely stock hardware. A downpipe is only needed once you move to Stage 2 and want the engine to breathe for the bigger gains.

Yes. Samuel calibrates your S58 remotely from your datalogs and delivers the file to flash at home, anywhere in the world. No need to ship the car or visit a workshop.

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