AMSOIL is the Official Oil of the Ultimate Callout Challenge (UCC), a friendly annual competition between owners and builders of some of the biggest and gnarliest diesel-powered American hot rods. Competitors are required to complete three events: dyno, sled pull and drag race, with winners crowned in each event.
The winning turbodiesel truck at the 2024 AMSOIL Ultimate Callout Challenge (UCC) was built by Team AMSOIL racer Ken Bruner, a mechanical engineer who designs medical devices when he’s not racing turbodiesel trucks with his company Capital Diesel Performance.
Bruner claims his engineering background helps him understand how things work, but experience comes from breaking stuff, evaluating why, then fixing it. He puts an engineering touch on everything from suspension setup to center of mass, trying to anticipate what could happen, then designing things to not break. Attention to detail is obvious in every aspect of his build.
Bruner’s 2024 UCC-winning truck started as a 2006 Dodge* Ram* 2500, upgraded with a 6.7L Cummins engine built by Freedom Racing Engines with a solid, air-cooled Hamilton Cams block, twin Garrett G55 turbochargers and tuned by Ryan Milliken of Hardway Performance Solutions. It’s a high-performance engine with a highly modified 48RE transmission to transfer that power to the ground.
The winner of the AMSOIL Ultimate Callout Challenge is decided by combined scoring in three events: one-eighth mile drag time, maximum dyno horsepower and sled pull distance.
Ken Bruner’s 2024 UCC Championship winning results:
1st-place drag: 5.29 seconds
2nd-place dyno: 2,832 horsepower using four stages of nitrous, starting at 3,200 rpm and ramping up to peak horsepower at 4,300 rpm with turbos spinning at 75,000 rpm. The dyno registered 3,120 pound-feet torque in competition.
1st-place sled pull: 317.81 feet. To prevent destroying the engine and tires, the truck was limited to output 1,600-hp to the wheels on the sled pull, running 5,500 rpm in second gear.
Ken Bruner ran the following AMSOIL products to keep his air-cooled 2,800-hp turbodiesel running perfectly throughout the entire competition:
The 2025 AMSOIL Ultimate Callout Challenge will be held May 30 – June 1 at Indianapolis Raceway Park in Brownsburg, Indiana.
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AMSOIL Technical Writer and 20-year veteran of the motorcycle industry. Enjoys tearing things apart to figure out how they work. If it can’t be repaired, it’s not worth owning.
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