Tuning · BMW Z4 sDrive20i (G29)
Z4 sDrive20i
B48
The B48 in roadster form. Hand-calibrated from Stage 1 through to a hybrid-turbo build. Choose your package, send your build to Samuel, and get a tune that fits the way you actually drive.
BMW Z4 sDrive20i tuning
BM3, MHD and MG Flasher all support the Z4 sDrive20i's MG1CS003 DME fully through Stage 1, Stage 2 and the Stage 3 hybrid and big-turbo builds — the platform choice is about your preferred flashing tool, not the calibration. Samuel delivers the same hand-built map on all three.
Engine
B48
Stock
197 bhp · 320 Nm
Stage 3 ceiling
197 bhp
Configurator
Build your Z4 sDrive20i 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 G29 Roadster is the lightest body the B48 appears in — stage figures that benchmark well in a 330i or 430i feel sharper here. Every Z4 sDrive20i map Samuel produces is calibrated to the specific car: its fuel grade, its installed hardware, and its data logs after the first flash.
Compatibility
This Z4 sDrive20i tune runs on Bootmod3, MHD or MG Flasher — all three flash the B48 over OBD. Compare platforms or see full B48 compatibility.
Engine guide
B48 in the Z4 sDrive20i: why it responds to tuning
BMW set the Z4 sDrive20i at 197 bhp · 320 Nm from the factory. The B48 underneath runs at meaningfully higher outputs elsewhere in the lineup — the same hardware, a more conservative software calibration. That gap is where Stage 1 operates: 290 bhp · 480 Nm from the OEM turbo, no hardware required, flashed over OBD in around 15 minutes.
Stage 1
290 bhp · 480 Nm
No hardware required. The MG1CS003 DME is flashed via the OBD port, boost pressure, ignition timing, fuel delivery and torque limiters all revised. BMW Z4 sDrive20i Stage 1 unlocks 290 bhp / 480 Nm from the OEM hardware (up from 197 / 320 stock), a transformative single change for a 1,500-kg roadster.
Every Z4 sDrive20i tune Samuel produces is calibrated individually for the specific car, fuel grade and installed hardware, not a base map loaded and left. BMW Z4 sDrive20i tuning done correctly accounts for the G29 chassis behaviour, the 8HP gearbox calibration and UK fuel quality; the map is reviewed against your data logs after the first flash and revised before sign-off.
Z4 sDrive20i specs & stage targets
BMW Z4 sDrive20i tuning at a glance
- Engine
- B48 · 2.0L turbocharged inline-four
- Body styles
- G29 Roadster
- Chassis codes
- G29
- Production
- 2018–present
- Drivetrain
- Rear-wheel drive
- Gearbox
- 8-speed ZF automatic
- Stock output
- 197 bhp · 320 Nm
- Tuning ceiling
- ~400 bhp on the right hardware
| Stage | Target |
|---|---|
| Stage 1 | 290 bhp · 480 Nm |
| Stage 2 | 320 bhp · 500 Nm |
| Stage 3, Hybrid Turbo | Up to 400 bhp depending on spec |
| Stage 3, Big Turbo Kit | Up to 400 bhp depending on spec |
FAQ
Z4 sDrive20i tuning — frequently asked questions
Stage 1 lifts the Z4 sDrive20i from 197 bhp · 320 Nm at stock to 290 bhp · 480 Nm — no hardware required. The map flashes via the OBD port on BM3, MHD or MG Flasher in around 15 minutes. Torque arrives earlier and the throttle response tightens substantially; in a rear-wheel-drive roadster at this weight it's an immediately different car.
This page covers the G29 Roadster — the only body style the Z4 sDrive20i was produced in, from 2018 to present. The B48 and chassis code are consistent across the production run, so the calibration applies to all years. Every tune Samuel delivers is tailored to the specific car's fuel grade and installed hardware, not pulled from a base file.
Stage 2 targets 320 bhp · 500 Nm and needs a downpipe and intake. The standard turbo, fuel system and intercooler all hold within Stage 2 on the B48 — no further hardware changes are required before submitting the build.
Stage 1 and Stage 2 run on the standard turbo. Beyond that, the B48 in the G29 scales to around 400 bhp on a hybrid turbo or big-turbo conversion with supporting fuelling — the calibration for either is built bespoke around the specific hardware spec you submit. The Z4's smaller cooling pack means the ceiling sits a touch below the saloon platforms at the same turbo, but it's the same 400 bhp figure on the right build.
The Z4 sDrive20i runs a ZF 8HP automatic, and xHP calibration is strongly recommended at Stage 2 and above — the torque increase at that level puts the standard gearbox calibration behind where the engine is operating. At Stage 1 it's optional, but the shift behaviour tightens noticeably with xHP in place. Available as an add-on on this page.
Keep exploring
Keep exploring Z4 sDrive20i tuning
Other B48 models we tune: G20 320i, 330i, 330e, G22 420i, 430i, 530e.
Engine guide
B48 tuning
Every B48 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 Z4 sDrive20i, 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