2006 Chevrolet Silverado 2500HD 7.1L Duramax - Diesel Power Challenge 2014 Competitor

Mike McGlothlin
Jun 24, 2014
Photographers: Diesel Power Staff
It's been said that a truck built to sled pull has the best chance of winning Diesel Power Challenge. After all, prepping a truck to hook to the sled requires a stout driveline, reinforced suspension and steering components, and the truck itself is often kept low to the ground and sporting all-terrain tires. All of these things help a truck do what it must do in order to win DPC: perform and survive.
Well, it just so happens that each year we get a few experienced sled pullers competing in Diesel Power Challenge. This year's veteran puller is Troy Sankey of central Wisconsin, aka Duramax country. He's a regular on his local pulling circuit (the Southwest Wisconsin Pullers organization) with a lot of wins racked up, and a battle-tested Silverado to show for it.
Photo 2/10   |   Troy Sankey 2006 Chevrolet Silverado 2500HD Duramax Rear View
The LBZ Duramax under the hood benefits from added displacement, courtesy of a stroker kit from SoCal Diesel. Carrillo connecting rods, forged-aluminum pistons, SoCal's 3388 cam, and ported cylinder heads all made it into the long-block build. Troy handled the engine assembly and tells us it's been bulletproof so far, holding up for countless sled pulls and plenty of passes at the dragstrip.
After Troy was voted into this year's competition, he began forming a plan of attack for dealing with the elevation change he would face out in Denver. Opting for compound turbos instead of a single S400, Troy contacted Engineered Diesel, which spec'd him an S400/S400 remote mount arrangement with an 84mm low-pressure charger. Considerable fabrication work would follow, including a masterpiece of an individual runner intake manifold from Wehrli Custom Fabrication. Troy would also ditch the stroker CP3 for a set of Wehrli Custom Fabrication's dual CP3s. The proven, rock-solid engine was left untouched, as was the built Allison transmission with a loose, 3,000-rpm-stall torque converter.
Back home (much closer to sea level), Troy's 2006 Chevrolet Silverado 2500HD stroker Duramax dyno'd more than 1,100 hp at the rear wheels. If he can make that kind of horsepower at altitude, you're looking at a truck that could run 10s in the quarter-mile—easily. The standard cab Bow Tie's 6,800-pound race weight will certainly be beneficial on the pavement as long as it can find traction. Troy has already clicked off an 11.19-second run at 123 mph in the truck's previous form (single CP3 and turbo), so you can bet a 10 is in the truck's near future.
As far as towing a trailer is concerned, Troy has that covered, too, having towed trailers ever since he can remember. The combination of his Chevy's light weight helping him at the dragstrip, vast towing experience aiding him in the trailer obstacle course and eighth-mile trailer tow, great familiarity with this truck, and vast sled pulling experience, could definitely make Troy a top contender in all events.
Photo 6/10   |   Troy Sankey 2006 Chevrolet Silverado 2500HD Duramax Under Side
Photo 10/10   |   Troy Sankey 2006 Chevrolet Silverado 2500HD Duramax Engine

Build Sheet
Name/City: Troy Sankey/Stevens Point, Wisconsin
Vehicle: 2006 Chevrolet Silverado 2500HD
Driver Experience: Dyno, sled pull, drag race, tow, wrench
Engine: 7.1L LBZ Duramax stroker motor from SoCal Diesel with Carrillo rods, forged-aluminum pistons, ported heads, SoCal 3388 camshaft, Wehrli Custom Fabrication individual runner intake manifold
Turbo(s): Engineered Diesel S484/S400 compounds, externally wastegated
Fuel: Wehrli Custom Fabrication dual CP3s, Exergy Engineering 100-percent-over injectors, AirDog 200-gph lift pump
Electronics: EFILive (self-tuned)
Injectables: Custom two-stage nitrous system with select Nitrous Express parts
Intake/Exhaust: Custom intake/Custom exhaust with 5-inch stack
Transmission: Allison 1000 six-speed automatic with Sun Coast billet shafts, GMax-6 clutch kit, and 3,000-rpm-stall torque converter
Suspension: 4-inch Tuff Country lift kit, custom traction bars
Tires/Wheels: 305/65R18 BFGoodrich A-T/18x10-inch Pro Comp
Differentials: 4.56 gears, Eaton ELocker locker (front), spool (rear)

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