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COBB Accessport V3 ECU Flasher Fiesta ST 2014-2019 FB3 Package
COBB Accessport V3 ECU Flasher Fiesta ST 2014-2018 FB3 Package

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Sale price:$1,249.00
Savings: $348.00

Availability: Usually Ships in 1 to 2 Business Days
Product Code: AP3-FOR-001FA3

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COBB Accessport V3 ECU Flasher Fiesta ST 2014-2019 FB3 Package


COBB Accessport V3 ECU Flasher Fiesta ST 2014-2019 with:

  • COBB Accessport V3
  • mountune High Flow Induction Upgrade
  • mountune Roll Restrictor (RMM)
  • mountune Optimized Calibration
  • mountune Intercooler
  • mountune Badge

The Accessport is the industry leading OEM ECU flashing, managing and monitoring assistant. Unlock power hidden within the ECU by replacing conservative factory settings with more aggressive calibrations. The standard Cobb Accessport from mountune USA includes all of the standard Cobb calibrations along with an Optimized mountune calibration built to your specifications based on your modifications, octane, and preferences. The results are impressive gains in torque and horsepower with incredible custom features that can be adjusted to meet your requirements. With over 15 years of Ford 4 cylinder ECU calibration experience it's no surprise that mountune USA are partners with Team O'Neil Motorsports, LaRoza Racing, and O.D.D. Racing. And with multiple Rally America Championships won using mountune USA custom calibrations, our programming team has more Fiesta ST tuning experience than any other source available to you. This Accessport is not locked and can be further adjusted at any time.

Mountune Performance calibration slot assignments

The mountune calibrations include 4 slots that are switchable at any time, on the fly, by simply pushing a few buttons. This is a very convenient feature that can be further adjusted in many cases. The default settings for the Fiesta ST are laid out as such:

  • Slot 1 - Standard high performance calibration
  • Slot 2 - Standard high performance calibration with indicated Launch Control
  • Slot 3 - Low boost performance calibration
  • Slot 4 - Same as Slot 1 with LESS spark (aka panic mode / bad fuel mode)

**Launch control & flat foot shifting can be adjusted anytime via the Accessport. By default launch control is set at 2400 RPM and flat foot shifting is set at 4000 RPM.

Ford Fiesta ST with mountune ECU calibration compared to the stock ECU calibration. Greater gains will be realized with the mountune air intake and intercooler upgrade installed.


This part has been designed and is intended for off-highway application only. Installation of this part on a vehicle that is driven on public roads may violate U.S. and Canadian laws and regulations relating to emission requirements and motor vehicle safety standards. Click Here for Emissions compliance information.

Championship winning Fiesta ST with Mountune ECU programming and hard parts
Cobb slot switching, Launch Control, and Flat Foot Shifting explained

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Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 5 Write a review »

  0 of 0 people found the following review helpful:
5 of 5 Exceeded my expectations! March 23, 2019
Reviewer: Edgar Quiroz from San Diego, CA United States  
What a difference! I never considered my 2015 Fiesta a slow car, but after installing this package stock feels slow. For comparison: my Fiesta carrying 5 people feels like it did stock with just me in it. 6th gear on the freeway feels like 4th stock. It feels like the car doesn't even notice uphills anymore.  
The rear motor mount does add a tiny bit of vibration at idle but I only notice it if I'm looking for it, feels normal. Improved the shift feel a lot.

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  0 of 0 people found the following review helpful:
5 of 5 Best mod package January 21, 2019
Reviewer: Evan from OH  
Purchased 6 months ago and had datalogs done for about 4 months now. Wow! This package has to be the best buy for the fist in terms of cost to power. An absolute monster now with gobs of torque that hits way above it's weight class and pulls/hangs with much more powerful cars. I had my doubts that the factory turbo could put much more out than stock but those concerns were quickly silenced post install.  Highly recommend adding a traction bar and good tires to keep everything in line as you will need it to get the most out of the power in this setup and be able to maximize use of the LC. 211whp/285wtq (running pilot a/s3's with upgraded IC piping and no exhaust or additional intake mods outside the fb3 package).

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  1 of 1 people found the following review helpful:
5 of 5 Power Package December 20, 2018
Reviewer: Christopher Schwab from Santa Clarita, CA United States  
High Quality products. Everything as described. The Fiesta is a fun car and this package makes noticeable power gains. Just get it. You won’t be disappointed.

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  1 of 1 people found the following review helpful:
5 of 5 My new daily March 23, 2018
Reviewer: Stephen Anderson from Lakeville, MN United States  
haven't had a chance to do data log yet but loving everything so far !!!
Worth every penny !

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  1 of 1 people found the following review helpful:
5 of 5 Great Product, True Bolt-On October 7, 2017
Reviewer: Foster from Lexington, KY United States  
The quality of Mountune's products were great, and absolutely everything fit as well as an OEM product. I couldn't be more happy with my purchase!

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