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Product Summary

  • The GT Diesel tuner unlocks more horsepower and torque to meet the unique demands you put on your vehicle
  • Features customizable gauges to track performance
  • Offers better control of defueling and regeneration
  • Gives you the ability to summon the low-end power to take on tough jobs or improve fuel economy for long highway hauls
  • Has room for up to 10 custom tunes that help you adjust for the many ways you put your diesel to the test

Key Specs

MFG. Part #40420
BrandBully Dog

Need To Know

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Bully Dog 40420 Details

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.

Charts

CARB Warning

For race/ off road use only

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

Bully Dog 40420 Specifications

KEY SPECS
MFG. Part #40420
BrandBully Dog
GENERAL
Sold in QuantityEach