Bring your BMW.
Book your visit and confirm vehicle compatibility and the work with us. İnönü Mahallesi, Düzenli Sokak No:3/A, Ataşehir / Istanbul.
BMW G20 320i tuning — Ataşehir, Istanbul
3 Series Sedan: we provide engine tuning, unlock and gearbox tuning at MOSTUNED for compatible vehicles with the 1.6 B48B16 engine and MG1CS003 ECU. The model badge alone does not establish compatibility: engine, ECU and current software must be checked together.
BMW tuning at our Ataşehir workshop.
MOSTUNED provides BMW engine tuning, ECU unlock and gearbox tuning in Ataşehir, Istanbul. We also develop our own iOS app.
300 HP workshop package
For compatible 1.6 B48B16 / MG1CS003 vehicles: unlock, engine tuning and Stage 2 gearbox tuning for €750. Plan your visit.
Stay in control afterwards.
Use the app with a compatible vehicle, an authorised VIN, the appropriate package and connection hardware. Compare workshop services with online Flash licences before purchasing.
What does the €750 package include?
Workshop service: ECU unlock, 300 HP engine tuning and Stage 2 gearbox tuning for a compatible vehicle. Total application takes approximately 30 minutes once compatibility is confirmed; vehicle condition and any additional work can affect timing.
Burble intensity and RPM range can be adjusted in the app, with burble active only in Sport mode. Sport Cooling on/off, Cold Start suppression and an optional RPM limiter depend on vehicle and package compatibility.
300 HP identifies the package level, not a guaranteed measured result for every vehicle. Actual power depends on condition, fuel and hardware. The power comparison below is not a customer vehicle dyno measurement.
Why is the 320i 1.6 litres in Turkey?
The reason is tax, not engineering. Turkish special consumption tax brackets are set by engine displacement, and the rate jumps sharply above 1,600 cc. Like many manufacturers, BMW offers a variant that stays under the threshold: the B48B16.
It is a member of the B48 family: same architecture as its 2.0-litre sibling, smaller swept volume and therefore different factory torque maps. Factory output is 125 kW — 170 metric horsepower (PS).
In practice this means most "320i tune" files you find online were built for 2.0-litre cars. Same badge, different engine. Loading them on a Turkish 320i does not give a correct calibration.
What the calibration looks at on a Turkish 320i
On a small-displacement turbo engine the priorities differ from a large one.
Torque model
Pedal demand is first converted to a torque request. Unless the torque model is updated, raising boost alone achieves nothing; the ECU pulls it back.
Intake air temperature
A small engine makes the same power at a higher boost ratio. If the temperature-based pull-back thresholds are not handled, the car falls off noticeably in summer.
Fuel quality
On direct injection an octane difference goes straight into timing. A calibration built without knowing your fuel is either unsafe or leaves power on the table.
Fuel system margin
Injector duty and rail pressure are the real limit on how far the target can go. One of the first things we look at in a log.
MG1CS003
The ECU in this car. Read, write, coding and unlock detection were verified end to end on this unit.
Unlock status
Cars built after June 2020 ship locked. The app checks for free — unlock page.
Power by stage
Factory output 170 PS. Figures in metric horsepower (PS).
280 and 300 on stock hardware; 320 needs a downpipe and suitable fuel. The stage is chosen from datalog data. Package-level comparison; not measured dyno results.
Packages and power stages
280 and 300 are delivered on stock hardware, software only. 320 needs a downpipe and fuel support — turbo and injectors stay stock on all three.
| Package | Power | Hardware | Gain |
|---|---|---|---|
| Stock | 170 HP | factory | — |
| 280 HP Package | 280 HP | stock hardware | +110 HP |
| 300 HP Package | 300 HP | stock hardware | +130 HP |
| 320 HP Package | 320 HP | downpipe + fuel | +150 HP |
Figures are metric horsepower (PS) as used in Turkey; the UK bhp equivalent is slightly lower (170 PS = 168 bhp). 320 is not delivered on stock hardware — a downpipe must be fitted and the fuel must suit it; that is Stage 2 territory. Which stage suits your car depends on fuel quality, maintenance and what we see in a road log — datalog analysis exists for exactly that.
Included features
Alongside the power stage, toggles you control from the app. For track / closed-road use; road legality is the user's responsibility.
Crackle / Pops (adjustable)
Controlled crackle and pops from the exhaust. Rev range, speed and intensity are set from the app.
Cold Start Delete
Silences the high-idle, noisy warm-up on cold starts. Quiet mornings — fully off or off once warm.
Speed Limiter Off
Removes the factory electronic speed limit (Vmax).
RPM Limiter
Adjusts the rev limit to suit your stage.
OPF / DP Calibration
Compatible calibration for particulate-filter delete or downpipe cars.
Sport Cooling
Earlier, more aggressive cooling for high load and track use.
Flash licences for the app
The products below are licences used through the app. Book a visit for the €750 workshop package including unlock and Stage 2 gearbox tuning.
Flasher
€350
- Write your own or your tuner's file
- Crackle, OPF/DP, Vmax, cold start, RPM included
- Original backup + return to stock
- No ready HP maps included
Flasher + 280/300 HP
€750
- Flasher + 280 and 300 HP ready maps
- Stock hardware, software only
- All features (crackle, OPF, Vmax…)
- Original backup + return to stock
Full: Flasher + 280/300 + 320
€900
- Flasher + all three stages
- 320 needs downpipe + suitable fuel
- €150 cheaper than buying one by one
- Original backup + return to stock
Already own the Flasher? 280/300 HP package €500, 320 HP add-on €200, both together €700. Pick your car and situation on Find my package to see the right price. You can check your car's eligibility for free from the app before buying.
You pick the package in the app
You choose the stage and the extra toggles on the app's Flash screen. The package card shows the stages authorised for your VIN — without access, the option does not open.
Exhaust sound (crackle), speed limiter and cold-start behaviour are separate switches; which ones suit your car we decide together.
Once the write starts, progress and a log of every step scroll on screen. You do not need to leave the app before it finishes.
Why we choose the stage with you
Wanting the biggest number is natural, but the right stage depends on the car's own condition. On a car with worn plugs, carbon build-up or low-octane fuel, the top stage produces constant knock correction instead of power — the ECU backs off and you are left with a car worse than the stage below.
That is why a healthy car matters. If you like, we take a road log and confirm knock, boost and air-fuel together — but the files are tested, and a log is not mandatory.
Moving between stages is possible. Because the software is updated through the app, stepping up when your car is ready does not mean going anywhere.
320i questions
Where is the work carried out?
At MOSTUNED, İnönü Mahallesi, Düzenli Sokak No:3/A, Ataşehir, Istanbul. Monday–Saturday 09:00–18:00; arrange an appointment before visiting.
Does the €750 price include gearbox tuning?
The workshop package described here includes unlock, engine tuning and Stage 2 gearbox tuning for compatible vehicles. Online Flash licence coverage is specified on the respective product pages.
How do I know whether my car is 1.6 or 2.0?
Engine displacement is on the registration document. A G20 320i bought new in Turkey is almost certainly 1,597 cc. The app also reads the ECU and software version on connection, and we confirm from there.
What if I load a file built for the 2.0?
The torque model and fill calculations are built for a different swept volume, so the car does not behave as expected; at best it corrects constantly. Not something to do.
Do you also do the 330i or 318i?
Our verified coverage is the Turkish-market 1.6 B48B16: 320i (G20), 420i (G22/G26), 520i (G30) and X3 sDrive20i (G01). For other variants we check compatibility first and say plainly if it is not supported.
Do I have to leave my car anywhere?
We offer installation at our Ataşehir workshop. You can also flash your own car through the app with a compatible vehicle, any required unlock, a VIN-authorised licence and connection hardware.
Related pages
- BMW B48 tuning — the whole engine family
- BMW 420i tuning — same engine, 4 Series
- BMW 520i tuning — same engine, 5 Series
- Unlock service — is my car locked
- Remote BMW tuning — how the process works
- Datalog analysis — health check before a remap
MOSTUNED’s own G20
MOSTUNED’s own BMW G20 — an original photograph of our car.
B48B16: Flash services by model
- BMW G22 / G26 420i — 4 Series Coupé and Gran Coupé
- BMW G30 520i — 5 Series Sedan
- BMW B48B16 — 1.6-litre engine family
Workshop, appointments and directions
- MOSTUNED Ataşehir — Address, opening hours, map and WhatsApp
MOSTUNED / ATAŞEHİR
Our Work
From the MOSTUNED workshop: engine tuning, gearbox tuning and coding projects.
Red G20 · 300 HP
Unlock, 300 HP engine tuning, Sport-mode burble and Stage 2 gearbox tuning.
G20 · 283 HP and M Track
283 HP engine tuning paired with Sport-mode burble, Stage 2 gearbox tuning and M Track.
G20 · 300 HP and Stage 2 TCU
This G20 received unlock, 300 HP engine tuning, burble and Stage 2 TCU as a combined engine and gearbox setup.
Contact
Get in touch
WhatsApp: +90 547 470 40 40
Email: destek@mostuned.com
Instagram: @mostuned
Istanbul · Monday–Saturday 09:00–18:00 (TR time) · Remote service by appointment
Not sure?
Send your model, hardware and goal — we will pick the right package together. We do not sell what does not fit.