BMW 330i 2020Custom ECU Tune
The electronic brain of your car — recalibrated.
A few decades ago, some nerds figured out that computers allowed for incredibly precise control of internal combustion engines... thus the ECU was born.
The Engine Control Module — often shortened to ECU, ECM, or DME — is the electronic brain of all modern cars. Unfortunately, car makers must consider things other than performance when designing ECU software, leaving much to be desired.
Enter S4T. Focused solely on properly developed ECU calibration software, giving you the highest performing and best driving car possible — sharper throttle, stronger mid-range, optimized airflow, and a more characterful engine note.
Switch back anytime.
Before we flash a single byte, we save your original ECU file. If you ever need to return to factory — for service, resale, or any other reason — you can revert to stock at any time.
How Remote Tuning Works (FEMTO)
Step 1
After you check out, you will receive a form via email (FILL OUT THE FORM).
Step 2
ECU Removal & shipping instructions provided via email
Step 3
FEMTO unlocks typically take 10-14 business days
Step 4
Deactivate over-the-air updates. These settings are found in 2 places. On the I-Drive and on your BMW app. Both must be deactivated. Deactivation instructions are available from us.
Step 5
Reinstall your ECU(s). Data log with the provided cable (We walk you through it).
Step 6
Have Fun.
ECU UNLOCK “FEMTO Unlock”
Any BMW produced after June 2020 requires a FEMTO Unlock. You'll send your ECU to us, and we'll pass it along to our associates in Europe for unlocking. Once unlocked, OBD tuning and data logging become possible. This entire process typically takes 10–14 business days. ECU removal and shipping instructions, plus an OBD device, are provided after purchase.
Transmission (TCU) Tune
Transmission Control Unit — TCU tuning allows us to further refine the shifting speed, ferocity, and characteristics of various automatic, semi-automatic, and dual-clutch gearboxes.
- Improved acceleration times (1/4 mile, 60-130 mph, 100-150mph, etc.)
- Torque limiter adjustment
- Custom torque management
- Paddle-to-shift delay time improved
- Increased internal control pressures to support greater torque demands and prevent slip
- Launch Control Enhancement
Options & Features
Extend Or Add Burble
Multiple Custom Maps That You Can Alternate Between
Adjust the tune for your octane rating
Top speed limiter removal
Calibrate the tune for every additional upgrade on the vehicle
Check engine light removal for downpipes (Stage 2 & For off-road use only)
Cold start delete - On/Off
Real-Time Data Monitoring
* All tunes are for off-road use and/or motorsport applications only. All tunes void factory warranty. Horsepower numbers are dependent on fuel, density altitude, and vehicle modifications.
Frequently asked questions
ECU tuning is the process of modifying the software inside your vehicle's Engine Control Unit to optimize parameters such as fuel delivery, ignition timing, and boost pressure — unlocking additional power, torque, and throttle response while preserving drivability.
