Max Energy tuner allows user to program in the truck’s tire height so speedometer is calibrated. Lambert and his tech team strapped Big Red on the main dyno and ran a number of runs to see what it was making in stock form. “We want to make sure in worst-case use, where your foot is on the floor with a big trailer in-tow up a steep grade for 20 minutes, your truck is still going to be OK.” “What we are looking for is maximizing efficiency and performance when the truck is being used within its factory limitations. “We aren’t looking to make the absolute maximum power with our tunes,” explains Hypertech’s hed programmer. Setting up a tune is very time-consuming and requires many, many hours of a truck sitting on one of the company’s two chassis dynos.įor example, Lambert says they put more than 2,000-plus dyno pulls on a 2007 Duramax to get the tune that they use for the LMM found in our 2008 GMC Sierra. “From there we may go on to boost pressure, fuel-injection pressure or any other parameters we can adjust to fine-tune the program to optimize the power output for the quantity of fuel used,” says Lambert. “Once we have found the sweet spot on fuel, then we concentrate on adjusting timing,” explains Lambert. When they see either a “point of diminishing return” in power related to the amount of fuel being sent into the cylinders – or temperatures rising above a certain threshold that would endanger engine longevity, they back down those adjustments.

Hypertech’s programmers are constantly watching brake specific fuel consumption (BSFC) – the fuel-to-power ratio. Lambert says the Hypertech tuning team also pays very close attention to turbo inlet/outlet and exhaust temperatures. “So we make incremental adjustments to the injector pulse widths and watch how those changes affect the engine’s power curve on the dyno. Uploading the Hypertech power tunes takes about 10 minutes the first go-‘round and less than 5 minutes thereafter. “Fuel is your primary focus of building power in a diesel,” says Lambert, who has been Hypertech’s tuning manager for more than a decade. So we turned to the engine-tuning experts at Hypertech ( 90) for a solution. In short, what the Mobil Dlevac Big Red GMC needs now is a boost in power to offset its new-found bulk.

Removing a hypertech tuner from duramax