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2015 Chevrolet Silverado 2500HD Speed Demon

Truck Trend logo Truck Trend 3/9/2018 Jason Sands

When Michael Runk bought his ’15 Chevrolet Silverado 2500HD, he immediately liked the power and torque of the 6.6L Duramax LML engine, but he thought the truck could be a little faster. “At one point right after it was new, I had one of the fastest LML-powered rigs in the country,” Michael laughs. “I didn't mean to; it just sort of happened.” Like any diesel enthusiast, Michael started his upgrade process with ECM tuning, then turbocharger swaps.

After conferring with Cody Spaulding and Mike Graves of Hollyrock Performance, Michael then added nitrous oxide and an awesome transmission from Evan Drosehn at Limitless Diesel Performance. “That led to a best elapsed time of mid-12s on fuel—and an 11.46 at 120 mph with nitrous,” Michael recalls.

When we shot photos of Michael's ride, it was dialed back from its 11-second trim. However, “The nitrous is still on there if I need it,” Michael points out. In its current and past forms, the 6.6L engine remains bone-stock, with the exception of a set of ARP 625 cylinder-head studs and a keyed crankshaft. The air and fuel systems, on the other hand, are massaged quite a bit.

a blue and white motorcycle parked on the side of a road: 002 Runks 2015 Silverado 2500Hd Engine© Jason Sands 002 Runks 2015 Silverado 2500Hd Engine

Fuel upgrades start with Michael using Fleece Performance Engineering’s CP3 conversion hardware to ditch the stock CP4 injection pump in favor of more reliable CP3 pumps. He then added a pair of 10mm Exergy Performance CP3s (one in the valley of the engine) using an ATS Diesel Performance Twin Fueler kit. A set of 100-percent-over Exergy injectors was added, as was a FASS Fuel Systems 150-gph lift pump.

The fuel system isn't the only part of the engine that received upgrades, as Michael has gone through several different turbo combinations. The setup presented in the photos is based on an HSP Diesel swap kit that’s highlighted by a BorgWarner S476 turbocharger prepared by Engineered Diesel and Pacific Performance Engineering up-pipes. Exhaust exits through an AFE Power 4-inch downpipe and intake air is chilled by a Mishimoto air-to-air intercooler. Michael doesn't want to have a shortage of nitrous, so he used some of the biggest pieces he could find from Nitrous Express, along with a Maximizer 4 progressive controller.

a close up of a car: 003 Runks 2015 Silverado 2500Hd Hsp Turbo Kit© Jason Sands 003 Runks 2015 Silverado 2500Hd Hsp Turbo Kit

With a conservatively estimated 700 hp on fuel and 900 hp when nitrous is flowing, the stock LML driveline’s fortifying includes a full competition transmission from Limitless Diesel Performance. The Allison 1000 six-speed automatic on steroids features billet C2 and P2 planetary gears; aftermarket input, main, and output shafts; a shift kit; Raybestos and Alto clutches (in a top-secret combination); and a SunCoast Diesel Transmissions triple-disc torque converter. Michael also went a bigger step toward drag racing his rig by lowering the rear, reinforcing the front end, and adding high-traction Nitto 420S tires.

“The truck only has 19,000 miles on it in three years, because we spent a lot of time running it at the track,” Michael laughs. In the end, though, he says one of the best decisions he made was retaining its street qualities. “It's a great truck for driving when the weather is nice.”

Why retire an 11-second truck? Michael is going all-in, building a Pro Street drag truck. “It should have nearly double the power and weigh about half as much—so it should be just a little faster, right?” Now that its track time is minimal, Michael plans to start driving the ’15 much more. “It's still a great driver, and there were definitely times I wanted to give up, but in the end I'm so glad I built this truck.”

004 Runks 2015 Silverado 2500Hd Ed Turbo

004 Runks 2015 Silverado 2500Hd Ed Turbo
© Jason Sands

Fast Facts

Year/Make/Model: ’15 Chevrolet Silverado 2500HD

Owner: Michael Runk

Hometown: Sykesville, Maryland

Odometer: 19,000 miles

Engine: 6.6L Duramax V-8, keyed crankshaft, ARP 625 cylinder-head studs

Fuel: FASS Fuel Systems 150-gph lift pump, twin 10mm Exergy Performance CP3 injection pumps, 100-percent-over injectors, Fleece Performance Engineering CP3 swap kit, ATS Diesel Performance Twin Fueler system

Air: BorgWarner S400 76mm turbocharger prepared by Engineered Diesel, HSP Diesel turbo-swap kit, PPE up-pipes, Mishimoto air-to-air intercooler

Exhaust: AFE Power 4-inch downpipe, SoFlo Diesel Custom Stacks dual 6-inch stacks

Programming: EZ Lynk with tuning by PPEI

Transmission: Allison 1000 six-speed automatic by Limitless Diesel Performance; billet P2 and C2 planetaries; aftermarket input, main, and output shafts; Pacific Performance Engineering deep pan

Horsepower: 900 hp

Torque: 1,500 lb-ft

Tires: 305/50R20 Nitto 420S

Wheels: 20x10 BMF Novakane

Suspension: McGaughy's Suspension 2-inch drop shackles, one leaf removed, CalTracs traction bars, Cognito Motorsports tie-rod braces, pitman-and-idler-support kit

Axles: 3.73 gears, AFE Power differential cover

Body: SoFlo Diesel Custom Stacks Cree LED foglights and lightbar

Interior: AutoMeter Competition Instruments recall gauges, Dirty Hooker Diesel Dirty Alli-Locker, BD Diesel Performance staging limiter

Fun Fact: The Silverado’s best 60-foot time is 1.63 seconds, which is pretty good for a 7,600-pound truck! Michael says the good launch is the result of perfecting his technique over many dragstrip passes.

Runks 2015 Silverado 2500Hd Lead© Jason Sands Runks 2015 Silverado 2500Hd Lead

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