You Can Now Tune Your Ford Fiesta ST's 1.5 I3 To 256bhp Using An App

We won’t ever see a Ford Fiesta RS, but via the aftermarket, it’s possible to get the next best thing. Mountune, arguably the go-to name when it comes to fiddling with Blue Oval stuff, has just revealed a new ‘M260’ package for the Fiesta ST.

This sees the stock 197bhp output jump up to 256bhp (260PS, hence the name of the kit), while the torque goes from 214lb ft to 269. Mountune hasn’t offered any performance figures for this, but with a clean enough launch, 0-62mph in five or so seconds should be doable.

The bumps in power and torque are made possible via the ‘mTune Smartflash ‘phone app, which works with a Bluetooth unit that plugs into the car’s OBDII slot. You’ll need to shell out £675 for the unit and the app, or if you have the existing M235 Fiesta ST upgrade, it’s £100 to upgrade to the new software. With the app, it’s possible to drop back to the stock power output whenever you wish.

Sounds like a steal, but you’ll probably want to spend a little more than that. Mountune recommends the fitting of an induction kit, an upgraded charge pipe and a beefier intercooler to “maintain performance and reliability”. Plus, you’re supposed to run the car on 97 octane fuel post-conversion.

Coinciding with the Fiesta announcement, Mountune also confirmed an M260 pack for the Puma ST, which uses the same 1.5-litre inline-three turbo engine as the Fiesta.

The increase in poke will more than make up for the Puma’s increase in weight and ride height relative to the Fiesta, but if you don’t want to go that far, it’s also possible to get an M235 upgrade for the vehicle. All the costs plus the recommendation for supporting modifications are exactly the same on the Puma.