Diesel Power Challenge 2015 Competitor Cory Chomos' 2011 GMC Sierra

A Built LML Duramax

Jul 11, 2015
Photographers: Trevor Reed, Jason Gonderman, Jeremy Cook
This 2011 GMC Sierra 2500HD owned by Cory Chomos is a repeat performer at Diesel Power Challenge. Cory and his truck, named Carmela, were voted into last year's competition, but catastrophic engine failure on the way to the event prevented him from participating. For DPC 2015, however, his truck is better than ever.
Photo 2/10   |   2011 Gmc Sierra Lml Duramax V 8 Engine Tubing Detail
Although it's hard to call anything this large and imposing "subtle," that word definitely describes the Sierra's sleek, silver bodywork. Amid a decidedly black-or-white competitive set, the Sierra stands out with its liquid-mercury paint, which has been applied to the truck's front and rear bumpers as well for a sleek, well-integrated look. The Fuel grille removes some of the truck's brightwork, while "bright" is the order of the day for its gigantic driving lights mounted behind the mesh. Inside, the truck looks fairly stock, but nitrous switches give away its potential.
Those switches control a two-stage nitrous system from Nitrous Express. The added stress of that nitrous could be dangerous, but learning from last year, Cory ensured his Sierra now runs a fully built 6.6L LML Duramax engine, featuring Arias pistons, Wagler Competition X-Series heads, and an alternate firing-order cam. Feeding that monster are dual Exergy Performance 12mm Stroker CP3 pumps, S&S Motorsports 400-percent-over injectors, and dual Fass 220-gph lift pumps. A Garrett GTX4202R 76mm turbocharger and a Precision Turbo & Engine 118mm ball bearing turbo complement the air-fuel mix with a lot of boost. A Custom Auto intercooler and ATS Diesel Performance–built custom intake, intake manifold, and exhaust manifolds keep everything breathing cool and easy, and a Kory Willis PPEI Custom Tuning program makes all the components work together.
Photo 3/10   |   2011 Gmc Sierra Front Drivers Side With Owner Cory Chomos
While Cory's Sierra isn't necessarily a sleeper, it's also not some overbuilt show pony. A 6-inch CST Performance Suspension lift kit and 37-inch Nitto Terra Grappler tires (wrapped around 20-inch Fuel Cleaver rims) provide it with a mean stance. Those tires are controlled by twin-reservoir Walker Evans shocks front and rear for prime stability. The whole setup promises good performance and reasonable reliability, and we're excited to see Cory is back for this year's Diesel Power Challenge. He's a passionate truck owner, and we're glad he's sharing his pride and joy with us.
"I started my company with this truck and have always loved it," Cory says. "I've owned it since it was new, and it's a big part of my family."
Build Sheet
Name: Cory Chomos
City: Drumheller, Alberta, Canada
Vehicle: '11 GMC Sierra 2500HD
Driver Experience: Dyno, drag race, and tow
Engine: 6.6L LML Duramax V-8
Turbo(s): Garrett 76mm GTX4202R 78mm turbo and Precision Turbo & Engine 118mm ball bearing turbo
Fuel: S&S Motorsports 400-percent-over injectors and twin 12mm Exergy CP3 pumps
Electronics: PPEI programmer with custom tuning by Kory Willis
Injectables: Nitrous Express two-stage nitrous-oxide system
Intake/Exhaust: Custom ATS Diesel Performance intake with AFE filter, custom intake manifold, and Custom Auto intercooler/ATS Diesel Performance manifolds and up-pipes; custom 6-inch exhaust
Transmission: ATS Diesel Performance LCT 1000 Allison 1000 six-speed automatic
Suspension: 6-inch CST lift and twin remote reservoir Walker Evans shocks, Customtrac traction bars
Tires/Wheels: LT355/60/R20 (37x14x20) Nitto Terra Grappler/20-inch Fuel Cleaver
Differentials: Front RCV axles with billet collars and rear Yukon Gear ring gear and axleshafts, 4.56:1 axle ratio
Photo 4/10   |   2011 Gmc Sierra Rear Drivers Side

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