Bmw X3M X4M F97 F98 - Full Stage 1 package FJM650/620 - Custom Tuned or Bootmod3 OTS Stage 1

Stage 1 Custom ECU Tune & Gearbox tune with Optional OTS Map

The FJM650 Performance Package is our premium Stage 1 upgrade for the BMW X3M and X4M, designed for both pre-LCI and LCI S58 models. Whether you want a fully tailored calibration or a quick OTS solution, this package delivers noticeable power gains, sharper throttle response, and enhanced drivability — all with a focus on safety and real-world performance.

What’s Included:

• FEMTO ECU Unlock – Your ECU is sent to Finland for a Femto unlock, which is required to enable tuning access. Typical turnaround is 3–5 working days, and your vehicle is securely stored with us throughout.

• FJM Stage 1 ECU Calibration – Our in-house custom Stage 1 map is built for stock hardware and refined through real-world data logging. It enhances power, torque, and throttle feel while retaining OEM drivability and safety margins.

• Optional: Bootmod3 Stage 1 OTS Map – Included with Licence. For those who prefer an off-the-shelf solution, we can flash a BM3 Stage 1 OTS map. This offers a reliable power boost of up to 620bhp using 98/99 RON fuel.

• FJM Stage 3 TCU Tune (XHP) – Sharper shift response, raised torque limits, and more intuitive gearbox behaviour across all driving modes. Essential for pairing with any performance tune. All our packages comes with Xhp gearbox map as this allows more torque through the gearbox. 

• Optional: FJM Drop-In Air Filters. High-flow filters that fit the OEM air boxes. Support improved breathing with no extra noise or harshness.

Performance Expectations

Custom Stage 1 Tune (FJM650)

• Power: Up to 650 bhp
• Torque: Around 870 Nm

BM3 Stage 1 OTS Option

• Power: Up to 620 bhp
• Torque: Approx. 800–820 Nm
• Ideal for those looking for a quick, proven Stage 1 flash with less setup time

Performance figures based on Tesco 99 or Shell V-Power and Dragy-tested real-world conditions. Results may vary based on fuel, tyres, vehicle condition, and temperature. 

Compatible Model's

• BMW X3M (F97) – Pre-LCI & LCI
• BMW X4M (F98) – Pre-LCI & LCI 

Why Choose FJ Motorwerkes?

We don’t just tune, we build, test, log, and refine. All FJM packages are proven on our own vehicles before being offered to customers. Whether you choose our custom calibration or a BM3 OTS option, you get expert installation, proper setup, and performance that’s backed by real data, not guesses.

Step 1 – Purchase Your Package Choose your desired tuning or performance package and confirm your booking with us.

Step 2 – Consultation & Booking One of our technicians will get in touch for a quick consultation to understand your needs and goals. We’ll then schedule your vehicle in at one of our locations.

Step 3 – Vehicle Drop-Off & ECU Unlock Drop your vehicle at one of our secure locations in Cambridge, Peterborough, or Essex.

We remove the ECUs and send them to Finland for Femto unlock (required for custom tuning on locked ECUs).

Turnaround time is typically 3–5 working days. Your vehicle is stored safely on our premises throughout.

Step 4 – Performance Parts Installation & Testing Once the ECUs return, we install all your selected performance hardware.

Your car is road tested to ensure everything is functioning safely and correctly.

Step 5 – Gearbox & ECU Tuning We install the XHP gearbox map, followed by custom ECU tuning.

This process takes 1–3 days as we log and fine-tune every setup properly —

no base maps, no shortcuts.

We’ll also log Dragy times on request (fuel costs passed on). Please note we tune & map vehicle on 99RON FUEL TESCO MOMENTUM OR SHELL V POWER - PLEASE MAKE SURE AT LEAST 2 Week before booking this fuel type is being utilised for optimum results.

Step 6 – Vehicle Handover & Setup Review Your car is ready for collection. One of our technicians or advisers will walk you through the full setup, provide usage guidance, and answer any final questions. Including BM3 Operation for Pop bangs and other gestures which maybe available within your BM3 licence.

This is a true hands-off service.

NOTE; All Bmw’s build after June 2020 require FEMTO

All tuning services and vehicle modifications offered by FJ Motorwerkes are strictly intended for off-road or motorsport use only. These services may not comply with local emissions or road safety regulations.