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Mk8 Fiesta ST m235 SMARTflash Upgrade - Fully Fitted at mountune HQ


The new flagship mountune m235 power upgrade for the Mk8 Fiesta ST releases the ultimate potential from the ST's 1.5-litre 3-cylinder  EcoBoost engine, substantially yet safely raising power and torque output; improving performance and drivability, whilst adding a host of functionality, unique to mountune.

As with all mountune upgrades, it's had to pass our own stringent durability testing criteria, which included additional months of in-cylinder pressure monitoring to ensure engine robustness, whilst retaining all safety parameters, so you can have complete peace of mind that you're not just buying the best upgrade for your Fiesta ST, but also the most robust aftermarket calibration, too.

Peak power is increased to 235PS, whilst torque is uplifted to 350Nm but, as can be seen from the power graphs, it's the substantial increase throughout the rev-range and the way the torque is delivered that transforms the driving experience.

Working together with industry leading software and hardware teams has enabled the very latest technology available to be incorporated, taking mTune - and making it a whole lot smarter!

The mTune SMARTflash app allows you to easily DIY install and update calibrations to your ECU using nothing more than our app, the supplied Bluetooth OBD interface and your Smartphone; no laptop, no wires, no handsets, no problem!

m235 SMARTflash includes three calibrations, with unique functionality:

  • m235 performance
Increased power and torque (235ps / 350nm)
More aggressive launch control strategy
Enhanced audible exhaust output in Sport / Track modes
Optimised no-lift shift functionality
  • Stock performance
  • 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.

The m235 calibration has been fully optimised around the mountune induction kit, which itself delivers a 
1.5kPa pressure drop, allowing the engine and turbocharger to work more efficiently in achieving the increase in power and torque.

Induction noise is also boosted and, with an engineered approach that retains the OE appearance, the airbox provides a subtle improvement to engine bay aesthetics, whilst also capable of flowing enough air to support further, future increases in power output.

m235 is available in two versions that support all known regional variations and as it can be installed and removed anywhere in the world, at any time yourself, you could say the power's in your hands, quite literally!

  • mTune SMARTflash m235 upgrade
    (supplied with induction kit)
  • mTune SMARTflash m235 lite
    for owners that have already upgraded their induction kit)

Please make your selection from the drop-down below.

Please note: the price shown for this product includes installation* at mountune HQ in Hutton, Essex and is not transferrable to any other Ford dealer or installer.

Please specify your preferred installation date in the 'notes' section when checking-out; our workshop team will then contact you back to confirm this date. If we can't accommodate your preferred choice, the team will discuss with you other available dates, that are still acceptable to you.

*subject to availability. Lead times may vary. Contact us for more information.

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5.0 Based on 7 Reviews
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Filter Reviews:
    Martyn B.
    United Kingdom United Kingdom
    Installed and working perfectly

    Now I installed the kit (corvid 19 shut the factory) the car is sooo different much better and is a joy to drive. love the pops and bangs too

    United Kingdom United Kingdom
    Feels more than 225bhp

    Had a great day at Mountune HQ. Their shop and waiting room is amazing and staff a very friendly and informative. I had the m225 package installed along with a throttle body elbow, and what a combination it is. The power comes on a lot sooner and is spread across the Rev range. It makes the already torque focused Mk8 engine feel even more powerful. A perfect upgrade that I feel makes the car feel even more sure footed and capable. I had the overrun calibration added to the package and it sounds incredible. Pops and bangs are easier to start and last longer without being ridiculous. All In all, a must have package that feels more than 225bhp.

    Christian A.
    M225 upgrade for Fiesta STmk8

    The whole buying experience and then a short notice booking of the fitting was very professionally handled. Fitting at Mountune HQ was great. If only all customer lounges were like this. Smart tv, games consoles free drinks and snacks etc and comfy leather seats, surrounded by cool car parts and clothing meant it was like a man cave which I loved. The install was super quick. Ryan Sinclair my contact was really attentive and helpful and really couldn’t do enough. I decided whilst I was there to have the throttle body elbow and it was installed with no problem despite the late notice. The car feels much more urgent and makes a few extra pops on gear changes as well as sounding more meaty. Really does feel night and day different. I am keen to have more things fitted when they come out. Despite the distance as I live in Derby, Mountune HQ fitting is the way to go. Thanks very much once again, brilliant service and great products.