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mTune SMARTflash m260 Upgrade [Mk8 Fiesta ST]

The mountune m260 power upgrade for the Mk8 Fiesta ST takes performance to a whole new level, quite literally, releasing up to 260PS and 365Nm from the ST's 1.5-litre 3-cylinder EcoBoost engine - and all whilst still retaining the factory GPF and catalyst.

The additional torque output is delivered across a wide spread in the rev-range which translates into effortless drivability and totally transforms the overall driving experience and fun-factor. By removing some of the inherent bottlenecks in the OE hardware, the optimised calibration boosts peak power to between 250-260PS and makes it equally rewarding to rev!

Installation couldn't be simpler, as the m260 calibration is supplied on our mTune SMARTflash app which allows for quick and easy calibration changes in minutes. All you need is our app, the supplied Bluetooth OBD interface and your Smartphone; no laptop, no wires, no handsets, no problem!

m260 SMARTflash also includes plenty of user choice as standard, with three specific performance calibrations, plus two companion calibrations (standard and anti-theft) which are supplied with the following features:

  • m260 performance calibration
Increased power and torque (up to 260PS / 365Nm)
More aggressive launch control strategy
Enhanced audible exhaust output in Sport / Track modes
Optimised no-lift shift functionality
  • m260 performance ASMO calibration 
Increased power and torque (up to 260PS / 365Nm)
More aggressive launch control strategy
Anti Social Mountune Overrun Enhanced audible exhaust output in Sport / Track modes (for those who really like their pops and bangs)
  • m235 performance calibration
Increased power and torque (235PS / 350Nm)
More aggressive launch control strategy
Enhanced audible exhaust output in Sport / Track modes
Optimised no-lift shift functionality
  • Standard power calibration
  • Anti-theft

In addition, the SMARTflash app, which is available for Apple and Android users, also allows for easy future calibration updates and includes a handy VIN and calibration ID reader as standard.

In order to achieve and maintain performance and reliability, the m260 upgrade should be used in conjunction with the hardware listed below and should only be used with 97RON+ fuel. If a lower octane rating of fuel is the only grade available we recommend switching to the m235 calibration which can be used on normal unleaded fuel reliably in all scenarios.

Recommended m260 hardware:

Phone shown for illustration of SMARTflash app only.

    Power, on another level

    Even versus our m235 upgrade, our m260 provides a very noticeable uplift in power and torque across the entire rev-range. Compared to the standard vehicle it's quite literally on another level!

    Please note: 97RON+ fuel should be used with m260. If this is not available, the m235 calibration should be utilised to maintain reliability.

    Individual vehicle output may vary based on vehicle condition, external parameters and method of testing.

    Recommended hardware

    To help achieve the power and torque figures indicated and to ensure maximum reliability and a degree of headway remains, the m260 should only be used when our charge pipe upgrade (which removes a very restrictive bottleneck in the charge system), an uprated intercooler and induction kit have been installed.

    Although not essential for m260, where possible, we would additionally recommend the use of our high-flow elbow, silicone induction hose, ACAI and GPF-back exhaust to ensure maximum unrestricted airflow and minimal pressure-drop across the entire intake and exhaust system.

    The Path To Performance

    Already running our m225 or m235 calibration, or perhaps your car's standard and you're not sure which option is right for you?

    Follow our look-up chart to see what your next calibration step is and which hardware you need to consider with it.

    Please note: installing the m260 calibration without the correct hardware may result in failure to achieve the quoted power / torque figures, abnormal running, detrimental fuel consumption or engine warning light illumination or, in extreme circumstances, damage to and / or failure of the engine. in any such instance no warranty is offered or implied by mountune.

    By purchasing this product you agree for mountune to send you email about new updates or technical features relating to SMARTflash. you can opt out at any time.

    Customer Reviews
    5.0 Based on 4 Reviews
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    Filter Reviews:
      Ross H.
      United Kingdom United Kingdom
      Just wow!

      Been running the m260 upgrade for a month or so now and I can honestly say I'm seriously impressed! I have all the required hardware a few other bits and I can honestly say I was not expected the end result to be as good as it is! Excellent throttle response in all gears and the pull throughout the rev range is staggering! A nice bonus is that I have also gained an impressive improvement in economy too! Not long after fitting, I completed a 150 mile round trip and averaged 55mpg sitting at between 60-70mph. This car did it all to begin with and now does so even better!

      Tom Y.
      United Kingdom United Kingdom
      Noticable increase in driving pleasure

      Don't hesitate, Coming from the M235 to the M260 puts a smile on my face every time I plant the pedal.

      United Kingdom United Kingdom

      Currently running on the m235 option and so far I'm very impressed. as I'm missing a vital piece of hardware to be able to run the full m260. Can't wait for the Charge Pipe Upgrade Kit [Mk8 Fiesta ST | Puma ST] to be available so I can run the full power

      mountune mTune SMARTflash m260 Upgrade [Mk8 Fiesta ST] Review