Bootmod3 (BM3) S58 ECU Flash Tune/Remap for BMW X3M X4M (F97 F98) M3 M4 (G80 G82) Competition - OTS Stage 1/2, E30, 95/98 RON - OBD App Tuning & Datalogging

S58 engine software upgrade for BMW X3M, X4M, M3 and M4 using Bootmod3

Unlock serious performance and razor sharp response from your twin turbo S58 without removing the ECU. This Bootmod3 licence gives you fast OBD flashing, easy map changes and powerful data tools in one polished package. It is a proven, cloud hosted calibration suite trusted by UK owners who want real gains with OEM-like drivability on road and track. We run this software on our own vehicles and customer builds and the results are superb – smooth torque delivery, repeatable power and rock solid reliability.

Key reasons enthusiasts choose this S58 software

• Flash through the diagnostic port in minutes on supported software versions
• iPhone and Android control, plus full browser access on Windows and macOS
• One off-the-shelf calibration included, with additional Free options available
• Swap maps in seconds for daily use, track days, ethanol blends and race fuel
• High speed data logging with extensive channel coverage and cloud storage
• Live dashboard gauges for real time monitoring
• Read and clear fault codes across multiple modules
• Reset learned adaptations including knock and fuel quality
• Return to stock at any time and re-lock the DME
• Supports custom tuning via the inbuilt editor or an approved calibrator

Popular OTS map features

• Editable maps through the integrated editor
• Transmission torque limit strategy adjusted in software
• Configurable exhaust overrun burbles on OTS and custom maps
• Max cooling function for hot conditions and track sessions
• Optional quieter cold start routine
• CEL suppression for de-catted setups for off-road use only
• Exhaust valve behaviour refined in sport modes
• Top speed governor removed
• Boost by gear control for improved traction
• Sport display recalibration
• Support for hybrid and upgraded turbochargers
• E30 blend, race fuel and methanol integration support
• Throttle mapping tailored for sharper pedal feel
• Backend flash options for piggyback users

Supported S58 models

• F97 X3M 2019 to present
• F98 X4M 2019 to present
• G80 M3 2021 to present – bench unlock required
• G82 M4 2021 to present – bench unlock required

Real world gains from the OTS calibrations

Stage 1 ACN91: up to 11% HP and 25% TQ

Stage 1 91 95 RON: up to 17% HP and 28% TQ

Stage 1 93: up to 21% HP and 31% TQ

Stage 1 E30 mix: up to 31% HP and 41% TQ

Stage 2 ACN91: up to 13% HP and 28% TQ

Stage 2 91 95 RON: up to 20% HP and 30% TQ

Stage 2 93: up to 23% HP and 34% TQ

Stage 2 E30 blend: up to 33% HP and 44% TQ

Stage 2 race fuel: up to 33% HP and 44% TQ

ACN91 maps are designed for regions where 91 octane 95 RON petrol may be of lower quality. Do not use fuel below 95 RON.

Good to know before you order

• Some 2019 and newer cars with November 2019 software may require an OBD unlock
• Vehicles built after June 2020 may not be flashable via OBD
• G80 and G82 platforms require a bench unlock service
• Licence is tied to a single VIN. It can be transferred once after reverting to stock and re-locking the DME

Connectivity and hardware options

• Optional BM3 OBD WiFi adapter for a cable free, in-car experience
• Direct ENET cable support for iOS and Android without the WiFi adapter

Fitting and setup by MJ Modifications

Want it installed and configured for you. MJ Modifications offers professional flashing, map selection and road setup in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.

Frequently asked questions

Can I self flash at home. Yes. You can duplicate the stock file, use the built-in map editor or work with a recognised tuner through the platform.

Do I need an internet connection every time. The system is cloud managed for updates. Once a map is downloaded you can flash offline.

Ethanol support. OTS calibrations are available for E30 blends. Full E85 typically requires a custom tune and suitable hardware.

Compliance notice

Some calibrations and hardware combinations may affect emissions control systems and road legality. Certain modifications can impact manufacturer warranty. Responsibility for compliance rests with the vehicle owner. For off-road or motorsport use where required by law.

Search and compatibility terms

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