With the release of the 6.7L Cummins came numerous advancements, one of which being the variable geometry turbo (VGT). A major benefit to this turbo design is the integrated exhaust brake that utilizes an internal sliding nozzle to cause back pressure for additional braking. For the majority of people that had never driven a vehicle with an exhaust brake, it was the greatest thing since sliced bread. But for those that were used to driving a vehicle with a traditional style aftermarket exhaust brake, or possibly even a Class 6, 7, or 8 truck with a legitimate engine brake, the factory VGT brake left something to be desired in terms of how much braking force was actually delivered.
Unfortunately, there wasn’t much that could be done to increase this braking power, short of installing an aftermarket non-VGT turbo and a traditional in-line exhaust brake….until the release of PacBrake’s LoadLeash engine brake! The LoadLeash is a supplemental brake that works in unison with the factory VGT brake to double your factory retarding power.
Now, how does it work? Lets first start off by comparing the key difference between an exhaust brake and an engine brake. An exhaust brake typically mounts down stream of the turbo inline the exhaust system and features a butterfly valve that is operated by an air supply. Based upon various parameters, the valve closes, causing the exhaust gases to pressurize, creating back pressure on the engine. In particular, the VGT exhaust brake found on 6.7L Cummins works by controlling a sliding ring within the turbocharger that moves back and forth. To contrast, an engine brake is mounted to the head of the engine, and creates a similar type of back pressure, but done so by controlling the opening and closing of the exhaust valves. The LoadLeash gives 6.7L owners the best of both worlds. As previously stated, the factory VGT brake does not provide nearly the retarding power as a traditional inline exhaust brake, and especially not as much as an engine brake, but by combining an engine brake with a VGT exhaust brake, the results are quite remarkable.
The LoadLeash has been in development for the past several years to ensure, without a doubt, that every potential flaw had been addressed, and that its compatibility was not sacrificed for any normal modifications that many Cummins owners typically make to their vehicles. The result is a product that will work on all 2007.5-2014 Ram and Sterling Cummins powered vehicles from a 2500 all the way to a 5500, no matter what transmission is installed, or what exhaust modifications may have been done.