S55 · 3.0 twin-turbo inline-six

BMW S55 tuning

The S55 is the 3.0-litre twin-turbo straight-six from the F80 M3, F82 M4, the M3/M4 CS, the M4 GTS and the F87 M2 Competition. It is a brilliant tuning base that comes alive with the right calibration and fuel.

See the S55 chassis

S55 vehicles

BMW S55 tuning, by model

SamuelTuned covers S55 tuning and remapping across the BMW M3 (F80) (F80), BMW M3 CS (F80), BMW M4 (F82) (F82 / F83), BMW M4 CS (F82), BMW M4 GTS (F82) and BMW M2 Competition (F87 LCI). 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.

F80

M3 (F80)

425 bhp stock

M3 (F80) Configure Tuning

F80

M3 CS

460 bhp stock

M3 CS Configure Tuning

F82 / F83

M4 (F82)

425 bhp stock

M4 (F82) Configure Tuning

F82

M4 CS

460 bhp stock

M4 CS Configure Tuning

F82

M4 GTS

493 bhp stock

M4 GTS Configure Tuning

F87 LCI

M2 Competition

410 bhp stock

M2 Competition Configure Tuning

Engine guide

BMW S55 tuning explained

The last of the analogue-feel M cars

The S55 ran conservative boost and fuelling from the factory, and it has serious appetite once that's freed up. A custom tune sharpens throttle, holds boost longer and wakes the car up across the range — Stage 1 alone makes the F80/F82 feel like the M car it always promised to be.

Where the big gains live: E85

The S55 absolutely loves ethanol. With a flex-fuel setup and a dedicated E85 map, the gains are substantial and that's where Samuel's custom calibration earns its keep — fuelling and timing on ethanol need to be matched to your exact car, which no off-the-shelf file can do safely.

Hardware path

Stage 1 is software only. Stage 2 wants a downpipe and benefits from an upgraded charge pipe and intake. E85 flex is the headline upgrade. Bigger builds move to upgraded turbos with a fully bespoke map around the hardware.

Tune stages

S55 tuning stages: Stage 1, Stage 2 & Stage 3

Stage 1

~480–520 bhp

Software only on stock hardware. Sharper, stronger everywhere.

Stage 2

~520–560 bhp

Downpipe + charge pipe/intake. Fuller top-end.

E85 flex

560+ bhp

Flex-fuel kit + ethanol map — the S55 thrives on E85.

Big turbo

Quoted per build

Upgraded turbos + supporting fuel. 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

S55 tuning, common questions

A custom Stage 1 on the S55 typically lands around 480–520 bhp on quality pump fuel, with E85 builds going well beyond. Exact figures depend on fuel and hardware.

The S55 responds exceptionally well to ethanol's higher knock resistance, allowing more boost and timing. With a flex-fuel kit and a dedicated map it's the single biggest gain available on the platform.

Bootmod3 and MHD both fully support the S55. The tune is calibrated remotely and flashed at home.

No. Stage 1 runs on stock hardware. A downpipe comes in at Stage 2 when you want the engine to breathe for the bigger numbers.

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