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2004 Chevy Silverado 2500 - Ludicrous Speed

Just Your Average Red Duramax—with 1,100 hp!

Jason Sands
Dec 16, 2013
Photographers: Jason Sands
Hey, look—another red Duramax. Sure, it looks clean and has some wheels, but where are the huge stacks, rollcage, and race-only parts? Surely the truck can’t be that much of a hot rod. After all, the rear bumper is still intact, the Chevy’s still at full weight—it doesn’t even have traction bars. So what if we told you that cranked all the way up, Jay Wilson’s Duramax-powered rocket has run as quick as 10.41 seconds at 128 mph? Interested yet?
As it turns out, the wild ride was kept on the downlow as far as looks went, on purpose. Even the DSP5 switch to change EFILive tunes is made with a tricked-out version of the factory cigarette lighter. While outside and interior cues are kept to a minimum, pop the hood and it’s clear where the truck’s performance stems from.
"We’re thinking of entering Diesel Power Challenge next year…
— builder David Browning"
The estimated 1,100hp (at the wheels) engine was built by David Browning at Diesel Technology Source (DTS) and features a host of aftermarket parts. The short-block needed to be able to withstand awesome boost levels, so it was outfitted with an ATI damper, Howard’s connecting rods, and ARP 12mm main studs. Aftermarket main caps from Pro Gram were also added to keep the factory crankshaft from wandering around too much. The final touch came with a set of Mahle racing pistons designed for performance applications just like this.
But the engine work didn’t just stop there. DTS supplied a custom-ground cam for the build, valvesprings, and rocker arm bridges to handle high-rpm situations. Trend Performance was responsible for the pushrods, but it was back to DTS once again when the heads were concerned, and both were treated to a full porting job.
Photo 2/14   |   Auto Meter Phantom II gauges (boost, pyrometer, and fuel pressure) are used to keep track of the truck’s vitals.
To break into the 10-second zone and four-digit power mark, a massive amount of air and fuel would be needed. To this end, DTS spec’d a turbo setup using Garrett ball-bearing turbochargers. For the manifold turbo, a 75.8mm GTX4202R got the nod, while the atmospheric charger is a mammoth 106mm GT5541 turbocharger. Matching the big air is an impressive amount of fuel. A PPE Dual Fueler kit was used in conjunction with twin Stage 2 CP3 pumps from Wicked Diesel Motorsports to keep rail pressure up. The twin pumps are supported by a FASS 220-gph lift pump, and they send fuel to DTS-spec’d 100hp injectors. The all-important tunes were created for the truck by Nick Priegnitz at Duramaxtuner.com using EFILive software.
If you’re thinking this truck must have one wild transmission to handle the Duramax engine’s oomph, you’d be right. Built by DTS, the Allison 1000 features a Sun Coast flexplate, Diesel Performance Converters triple-disc torque converter, aftermarket billet shafts, drive hubs, and planetaries. The transmission also uses a set of just-released Raybestos GPZ clutches to transmit power to the ground.
And boy, what fun there is to be had when the rubber meets the road. Since the truck doesn’t have a rollcage, Jay mostly runs the DSP5 switch on Level 3, a no-smoke tune that’s still good for about 700 rwhp and 11s at the track. Recently, David and Jay turned it up at a private test session just to see what it would do. After perfecting the launch, the truck cut a high-1.5-second 60-foot time on the way to a 10.41 at 128-mph pass. Both were elated, as the crew was hoping to crack 10s—but they didn’t expect it to be that quick.
Since then, the Chevy was clocked at 147 mph at a recent half-mile shootout in Georgia, bouncing off the limiter. David reports that a set of 3.42 gears and a six-speed swap are in the works to try and break the existing 167-mph standing mile record for a diesel pickup. “After that, we’re thinking of entering Diesel Power Challenge,” smiles David.
Bring it!
Fast Facts
Year/Make/Model: 2004 Chevy 2500
Owner: Jay Wilson
Hometown: Dunwoody, Georgia
Odometer: 172,000 miles
Engine: 6.6L Duramax, Pro Gram main caps, ARP studs, ATI damper, DTS cam, valvetrain, and ported cylinder heads
Air: Garrett GTX4202R and GT5541 turbochargers, Banks intercooler
Fuel: Wicked Diesel Motorsports Stage 2 CP3 pumps on a PPE mount kit, 100-percent injectors, FASS 220-gph lift pump, and Duramaxtuner.com EFILive tunes
Horsepower: 1,100 hp at 4,000 rpm (est.)
Torque: 1,600 lb-ft at 3,500 rpm (est.)
Transmission: DTS-built Allison 1000 with billet shafts, planetaries, drums, and Raybestos GPZ clutches; DPC torque converter
Tires: 305/50R20 Nitto Terra Grappler
Wheels: 20x10 Ultra Predator
Suspension: Stock
Fun Fact: At the Georgia half-mile shootout, the Chevy made an incredible 98 psi of boost!

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