Bully Dog 40420 Programmable Tuner, GT Platinum Diesel

The GT Diesel tuner unlocks more horsepower and torque to meet the unique demands you put on your vehicle. With shift-on-the-fly tuning*, customizable gauges to track performance, and better control of defueling and regeneration, you’ll be able to summon the low-end power to take on tough jobs or improve fuel economy for long highway hauls. Space for up to 10 custom tunes helps you adjust for the many ways you put your diesel to the test.

Adjustable Options with GT Platinum Diesel tuner:

• Coolant Temp Warning
  • This gauge option shows the coolant temperature in °F or °C.
• Rev Limiter
  • Regulate the highest RPM that an engine can reach before the engine is electronically limited. Increasing the RPM limit is recommended only for racing purposes.
• Transmission Shift Firmness
  • Change the shift firmness of an automatic transmission.
• Transmission Shift Points
  • Change the RPMs at which an automatic transmission will change gears.
• Transmission Temp Warning
  • This gauge option shows the transmission temperature. This information is used in warning settings to alarm when the transmission temperature limit is exceeded in automatic transmissions.
• Pyrometer Temp Warning
  • This gauge option shows the pyrometer temperature in °F or °C. This information is used in warning settings to alarm when the pyrometer temperature limit is exceeded.
• Speed Limiter
  • Change the top speed that the vehicle will reach before the engine automatically limits the power needed to go faster.

GT Platinum Manual (PDF)