Tuning · BMW M140i (F20 / F21)
M140i
B58 Gen 1
One of the great hot-hatch sleepers. Calibrated by hand from Stage 1 to a fully bespoke big-turbo build. Choose your package, send your build to Samuel, and get a tune that fits the way you actually drive.
BMW M140i tuning
The B58 Gen 1 in the F20 / F21 M140i is the same 3.0-litre single-turbo straight-six fitted to the M240i, 340i and 440i — same MG1CS003 or MEVD17 DME, same hardware ceiling. Samuel starts with the specific car: its fuel grade, installed hardware, and the 335 bhp / 500 Nm factory baseline that BMW kept conservative against global fuel variation and warranty exposure. Stage 1 revises boost, ignition timing, fuel delivery and torque limiters to reach 420 bhp / 600 Nm on the stock turbo and standard fuelling, flashed in around 15 minutes over OBD. Stage 2 recalibrates around downpipe (OPF delete if 2018+) and intake or panel filter, targeting 450 bhp / 650 Nm; Stage 2+ adds the B58 TU fuel pump for 480 bhp / 680 Nm. Stage 3 is bespoke around the turbo spec you submit.
Engine
B58 Gen 1
Stock
335 bhp · 500 Nm
Stage 3 ceiling
335 bhp
Configurator
Build your M140i tune
Choose your stage — Stage 1, Stage 2 or Stage 3 — add the options that fit your car, and send the full build to Samuel for a custom remote remap. He'll quote, schedule, and personally calibrate within 24 hours of confirmation.
Add a stage or add-on
£0
About this tune
The F20 / F21 M140i (2016–2019) is the LCI 1 Series hot hatch with the B58 Gen 1, the direct replacement for the N55-powered M135i and widely regarded as the last rear-wheel-drive 1 Series. Available as the F20 5-door and the rarer F21 3-door, both sharing the same drivetrain: B58 Gen 1 straight-six, ZF 8HP, rear-wheel drive. Samuel tunes both variants to the same standard — every file calibrated for the specific car, the actual fuel grade, and whatever hardware is installed.
Compatibility
This M140i tune runs on Bootmod3, MHD or MG Flasher — all three flash the B58 Gen 1 over OBD. Compare platforms or see full B58 Gen 1 compatibility.
Engine guide
What the M140i map revision covers: B58 Gen 1 stages explained
The MG1CS003 or MEVD17 DME in the M140i manages boost pressure, ignition timing, fuel delivery and torque limits — and the factory calibration runs all of them conservatively against global fuel variation and the warranty position. Samuel's Stage 1 map revises each of those targets for 420 bhp / 600 Nm from the OEM hardware, flashed via the OBD port. Stage 2 recalibrates around the expanded airflow from downpipe (OPF delete if 2018+) and intake or panel filter, targeting 450 bhp / 650 Nm. Stage 2+ adds the B58 TU fuel pump headroom and extends the target to 480 bhp / 680 Nm — the stock turbo, properly fed, at its real ceiling. Every file is log-reviewed after the first flash before sign-off.
Stage 1
420 bhp · 600 Nm
No hardware required. The MG1CS003 / MEVD17 DME is flashed via the OBD port, boost pressure, ignition timing, fuel delivery and torque limiters all revised. On the M140i the result is 420 bhp and 600 Nm (up from 335 / 500 stock), with substantially more accessible torque through the mid-range and a noticeably sharper throttle. This is the BMW M140i chip tuning starting point and by far the most popular single modification on the F20 / F21 platform.
Every M140i tune Samuel produces is calibrated individually for the specific car, fuel grade and installed hardware, not a base map loaded and left. BMW M140i tuning done correctly accounts for the F20 chassis weight bias, the 8HP gearbox calibration and the realities of UK fuel quality; the map is reviewed against your data logs after the first flash and revised before sign-off.
M140i specs & stage targets
BMW M140i tuning at a glance
- Engine
- B58 Gen 1
- Body styles
- F20 5-door · F21 3-door
- Chassis codes
- F20 / F21
- Production
- 2011–2019
- Drivetrain
- Rear-wheel drive
- Gearbox
- 8-speed ZF automatic
- Stock output
- 335 bhp · 500 Nm
- Tuning ceiling
- ~1000 bhp on the right hardware
| Stage | Target |
|---|---|
| Stage 1 | 420 bhp · 600 Nm |
| Stage 2 | 450 bhp · 650 Nm |
| Stage 2+ | 480 bhp · 680 Nm |
| Stage 3, Hybrid Turbo | 550-1000 bhp depending on spec |
| Stage 3, Big Turbo Kit | 550-1000 bhp depending on spec |
FAQ
M140i tuning — frequently asked questions
The calibrated M140i map is delivered to your BM3, MHD or MG Flasher account within 24 hours of payment confirmation. You flash it over OBD yourself in around 15 minutes — Samuel personally calibrates every file, no automated delivery.
Yes — the original B58 Gen 1 stock file is supplied before you flash, so the car can return to factory calibration at any time. The flash takes the same 15 minutes in reverse.
A factory warranty can be voided if BMW attributes a specific failure to the tune — that's a personal call. Samuel's M140i maps are calibrated to stay within the mechanical limits of the B58 Gen 1 hardware, and the tune is fully reversible to stock before any dealer visit. Many owners run a tuned M140i without issue.
BM3 is the most widely used on the B58 Gen 1 and the best pick if you want realtime monitoring through the app. MHD covers Stage 1 through Stage 2+ cleanly with a strong data-logging toolset. MG Flasher is a clean alternative for owners already in that ecosystem. The calibration is the same on all three.
Yes. Once you've driven the M140i on the new map, send your data logs back through your platform and Samuel reviews them before sign-off. If anything needs adjusting, the file is revised. That review step is what separates this from a generic off-the-shelf map.
Keep exploring
Keep exploring M140i tuning
Other B58 Gen 1 models we tune: M240i, 340i, 440i.
Engine guide
B58 Gen 1 tuning
Every B58 Gen 1 BMW we calibrate, with the full Stage 1, 2 and 3 breakdown for the engine.
Learn moreStages
Stage 1 & Stage 2 explained
What separates Stage 1 from Stage 2 on the M140i, the real-world gains and the hardware each one needs.
Learn morePricing
How tuning is priced
How the licence, off-the-shelf maps and custom calibration are priced. We quote your exact spec, never a fixed menu.
Learn moreGuide
What is bootmod3?
New to remote flashing? A plain-English explainer on the platform and how a custom map reaches your car.
Learn more