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COBB Accessport V3 ECU Flasher - Ford Focus RS B3 Package
COBB Accessport V3 ECU Flasher - Ford Focus RS B3 Package

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Sale price:$1,299.00
Savings: $178.00

Availability: Due to heavy demand of RS products, customers may receive partial shipments of orders.
Product Code: AP3-FOR-004B3

Auto Start / Stop:

Downpipe Type :

Engine Idle Speed :

Flat Foot Shifting :

Fuel Octane:

Hose Color :

Intercooler type:

Launch Control :

Shift Assist :

Turbocharger Bypass Valve :

Vehicle Type:

Exhaust Burble:


COBB Accessport V3 ECU Flasher - Ford Focus RS B3 Package

  • COBB Accessport V3
  • mountune Custom Calibration
  • mountune High Flow Intake (optional colors
  • mountune Uprated Air Recirculation Valve
  • mountune Roll Restrictor
  • mountune Badge

The mountune Focus RS B3 upgrade package includes the very best components to enhance and optimize the performance of your Focus RS including custom ECU calibration to optimize the performance of your car based on your specific use and build specification. mountune performance calibrations are proven to extract the maximum reliable performance and the mountune B series upgrade packages bring together the essential pieces to get you going.

We rely on the industry’s best tuning/flashing device, the COBB Accessport, to deliver our proven ECU calibrations. The Accessport coupled with mountune’s custom performance calibration, unlocks power hidden within the factory ECU calibration by replacing conservative factory settings with more aggressive calibrations. The COBB Accessport from mountune USA includes all of the standard COBB calibrations along with a custom 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. Our calibration team has more Focus RS tuning experience than any other source available to you. Our team has spent countless hours on the dyno and track developing performance upgrades that perform in a wide range of applications. Choose from one of the many upgrade packages to enhance your Focus RS.

Read about the Focus RS tuner B3 Package on Jalopnik.

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 Focus RS are laid out as such:

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

Maximize the performance of your Focus RS

For those who require additional support, the mountune ECU calibration can be optimized further with data logging and program revisions at no extra charge. Engine performance is enhanced by reviewing data logging files along with calibration revisions based on feedback from the end user. The duration of the calibration and file revision period for the chosen fuel type / octane is 45 days from the time the first file is sent to the customer, which is preloaded onto the AP when it ships out. Multiple calibrations can also be requested during this time period. Once the 45 day period has expired the free custom calibration period ends. Future custom calibrations are subject to additional fees depending on the exact nature of the request. mountune optimized Accessport calibrations are available only to customers who have purchased the Cobb Accessport directly from mountune.

Custom programming options include, but are not limited to:

  • On-the-Fly MAP (slot) switching
  • Auto Start / Stop disabling
  • Launch Control settings
  • Flat Foot Shifting settings
  • Ethanol (E30 & E40) support
  • 100+ Octane support
  • Gear Based Torque Limiting
  • Shift Assist settings
  • Exhaust burble settings
  • Idle Adjustment
  • Rev Limiters
  • Speed Limiters
  • Shift Light settings
  • Advanced Wastegate Adjustments
  • Low Traction / Wet Weather settings
*Please note this free offer for calibration optimization is not available for turbocharger upgrades, engine swaps, or nitrous oxide applications and applies to the original purchaser only. This service is non-transferable and other restrictions may apply. Some custom options are only available on vehicles equipped with manual transmissions. If you have questions about our mountune ECU calibrations please do not hesitate to contact us directly at (714) 424-9400 or at usa@mountune.com for more information.

**Please note the switchable slots for the Focus RS are ONLY operational on Mountune calibrations created on or after 1-11-17. ECU Calibrations created prior to 1-11-17 do not have switchable slots. Nor do they have functional Flat Foot Shifting enabled. If you have early programming that does not support slot switching and FFS please contact us to get updated.

***Ford Focus RS with mountune cold air intake (part #2536-CAIS-BLK) installed. Green dyno run has aforementioned parts installed with stock ECU calibration. Red dyno run has aforementioned parts installed with Mountune USA AP ECU calibration.


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.

Mountune ECU calibration and hard parts reviewed

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Average Rating: 5 of 5 Total Reviews: 4 Write a review »

  0 of 0 people found the following review helpful:
That much more fun! March 16, 2017
Reviewer: Chris from MD United States  
I have had the B3 package on my RS for about three months now and just wow. The car is so much more responsive in all driving conditions and has a ton more usable power all over the place. Randy has been great with tweaks to the tune after adding additional parts (downpipe/exhaust) and the car screams with the most recent update. The rear motor mount adds minimal interior vibrations and really fixed the rocking effect the drivetrain used to exhibit while coming on and off power. This is really probably one of the best all-around improvements you can make to an already awesome car.

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  0 of 0 people found the following review helpful:
You can feel the mid-range - wakes the car up. December 16, 2016
Reviewer: Will Bryson from Holt, MO United States  
I knew this car needed a tune, as it just wasn't quite as manic as I wanted it to be.  Lacked punch in the mid-range and just felt a little under-powered relative to the astonishing level of grip it has at the track (you are hanging on/slightly nauseated in the corners, then under-impressed on the straights).  This first stage takes it to the right level for a daily driver.  The power deliver is abrupt and makes you think the thing is a bit nuts, maybe a bit more torque steer influencing this analysis.  Mid-range power is now abundant and instant.  Donuts are easier, as are all moves in drift mode - this could be influenced a bit by colder temps as well.  I'm excited for refinements to enable Launch Control more easily (or all the time) as well as flat foot shifting.  Hand timed results below:

40-70 3rd gear pull stock = 4.0 seconds
40-70 3rd gear pull 91 tune =3.85
70-90 5th gear pull stock = 5.0 seconds
70-90 5th gear pull 91 tune = 4.4 seconds

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  0 of 0 people found the following review helpful:
Good November 1, 2016
Reviewer: Peter Holmes from Calgary, AB Canada  
Very happy with everything.

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  0 of 0 people found the following review helpful:
How The Car Should Have Came October 9, 2016
Reviewer: Christopher Ayres from Livonia, MI United States  
Love it. Working also with one of the longest and most knowledgeable tuner of Focus doesn't hurt it's score either. It's a Must have! It wakes up the beast in the car.

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