How To: Ford EcoBoost Mustang Transmission Brake and Bump Box (15-17)

Things To Look Out For

Threshold Requirements for Use of These Features

• Engine Coolant Temperature - at least 150 degrees F
• Transmission Temperature - at least 120 degrees F
• Maximum Time Allotted For Feature Use - 10 seconds maximum at WOT
• Cooldown Time Between Feature Use - 3 seconds
• These features can be used in any drive mode, however, we strongly recommend disabling traction control or ADVTrac prior to use.
  
  

Accessport Model Compatibility

• APv3 
  • AP3-FOR-003: 1.7.3.0-14822 or greater
    
    

Map Compatibility/Requirement

• COBB OTS Mapping, v5.02+ only
  
  

Applicable Model/Year

• Mustang EcoBoost 15-17, AT (automatic transmission) only
  
  

How To Enable Transmission Braking

To enable transmission braking, navigate through the following menus, starting at the main menu:

• Tune
  
  
   
• Adjustments
  
  
   
• Enable Transbrake and/or Transbrake 2-Step
  
     
     
  
  

How to Enable Bump Box

Transmission braking bump box is enable as a result of enabling the Transbrake feature, so you do not need to enable this feature separately.

Steps to Use Transmission Braking

Automatic Transmission Vehicles

1. Enable the transmission braking feature on the AP, either standard or 2-step.
2. Depress the brake pedal to 100%.
3. While holding the brake pedal down, fully depress the gas pedal to 100%.
4. The engine will rev to your specified RPM (if the 2-step limiter is enabled) and begin to build boost.
5. Release the brake pedal completely and keep the gas pedal at 100%. This will release the transbrake and launch the vehicle!
   
   

Steps to Use Bump Box

Automatic Transmission Vehicles

1. Enable the bump box feature on the APv3.
   1. For street tires we recommend using values between 12-15.
   2. For drag tires we recommend using values between 15-20.
2. Depress the brake pedal to 100%.
3. While holding the brake pedal down, fully dpress the gas pedal to 100%.
4. The Engine will rev to your specified RPM (if the 2-step limiter is enabled) and begin to build boost.
5. Press the "Set +" cruise control button to bump the car forward. You can do this repeatedly if you wish.
6. Release the brake pedal completely and keep the gas pedal at 100%. This will release the transbrake and launch the vehicle!
   
   

Available Adjustments and How to Make Them

Adjustments to transmission braking and bump box feature are configurable on the APv3.

• Adjust transmission braking settings
  
  
  • Tune
    
    
    
    
  • Adjustments
    
    
    
    
  • Change Transbrake 2-step RPM (Default Transbrake RPM must be configured within Accesstuner)
    
       
    
    
• Adjust bump box settings
  
  
  • Tune
    
    
     
  • Adjustments
    
    
    
    
  • Change Transbrake Bump Delay (we've found that a delay between "12-15" works well for a car on street tires)
    
       

Related Articles

• COBB Custom ECU Features
• How To Update Your AP's Firmware

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