In addition, 49-state and 50-state versions of the GT Diesel are available. The Bully Dog unit for diesels combines four primary features into one controller: engine tuning, engine monitoring/safeguards, gauges/performance-capturing, and diagnostics.

We grabbed a GT Platinum Diesel Gauge/Tuner, and decided to check it out thoroughly by installing it on a 2005 Ram with the 5.9-liter Cummins. One such tuner is the Bully Dog GT Platinum Diesel tuner, and this handy little device is the company’s best-selling product. Above and beyond adding fuel and air, these tuners often also offer a truck load of other features. This gives the truck better towing and acceleration characteristics. This is most noticeable in the low- to mid-RPM range, where it is not uncommon to have torque increases in excess of 100 lb-ft. With the alteration of air-fuel maps in the PCM, the engine will have improved throttle response, horsepower, and torque.ĭiesel engines are capable of running on a wide range of air-fuel maps, and huge gains can be made. One of the worst kept secrets in the aftermarket performance products world is the fact that enormous power gains can be achieved in a diesel truck through the installation of digital tuners. The Bully Dog GT Platinum Diesel Tuner offers access to special features such as diagnostics, as well as providing a power boost.

Bully dog tuner