EU customers, please read before purchasing

Important Info

Search our store

93 reviews

2709-235-BA

mTune SMARTflash m235 Upgrade [Mk8 Fiesta ST]

The mountune m235 power upgrade for the Mk8 Fiesta ST provides a substantial uplift in the performance from the ST's 1.5-litre 3-cylinder EcoBoost engine, 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 'first stage' 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.





Important: In order to achieve and maintain performance and reliability, the m235 upgrade should be used in conjunction with the hardware listed below. To achieve peak performance figures 97RON+ fuel should be used, however, it remains perfectly safe to use everyday and for all uses on 95RON fuel.

Recommended m235 hardware:

m235 supports 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!

    Our numbers don't lie

    m235 delivers a substantial, yet safe increase in power and torque across the entire rev-range. 
    genuine gains of up to 65nm and 36ps over the oe calibration transform the driving dynamic and in-gear performance and also allows the sprint from 0-60mph to arrive in just 5.9secs and knock well over a second off ford's standardised in-gear 31-62mph benchmark!

    power output may vary based on individual vehicle condition, fuel grade and method of recording.

    please note: all hardware is supplied as standard with a 12-month, 12,000-mile warranty against manufacturing defects.
    installing the m235 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 93 Reviews
    Write a Review Ask a Question
    • Reviews
    • Questions

    Thank you for submitting a review!

    Your input is very much appreciated. Share it with your friends so they can enjoy it too!

    Filter Reviews:
      C
      27/07/2021
      Chris
      Belgium Belgium
      m235

      What a difference over the stock map! Strong performance and a factory feel! Also a very good calibration of the throtlle response wich is way better and smoother in sport mode than stock! A must have! Great job mountune !!!

      LB
      24/07/2021
      Lindsey B.
      United Kingdom United Kingdom
      M235 power upgrade

      Very impressed with the M235 tune, i admire Mountunes philosophy when it comes to engine tuning. Most other companies just turn up the boost to make the highest numbers possible, and they do it because, to lots of people the highest number is all that matters. I put proven reliability, power delivery, drivability and traction above outright numbers, so whilst im fully aware that other tuners claim to make more power, sometimes for less money, from their stage one re maps, to me its all about the R & D and the thought and quality thats gone into all Mountune products. My ST is really punching strongly with the new M235 tune, and im looking forward to taking the next step up to M260...just need the intercooler. Thank you Mountune DB.

      mountune mTune SMARTflash m235 Upgrade [Mk8 Fiesta ST] Review
      W
      06/07/2021
      Will
      United Kingdom United Kingdom
      M235 Software

      As many others have said, this upgrade just finishes the car off and unleashes the hidden potential.