Turbocharged 6.7L Cummins Engine - Engine Builder Magazine

Turbocharged 6.7L Cummins Engine

Austin Ouellette is a true diesel head who's worked as a field technician for years on various vehicles. Being too busy with work, he enlisted Sin City Diesel & Off-Road to build him a standout 6.7L Cummins engine... and they delivered. Check it out!

Diesel of the Week is presented by

There’s no shortage of diesel talent out West – we’ve met our fair share of “desert” diesel engine builders who’ve impressed us with their standout builds. Frank Davis of Sin City Diesel & Offroad is one of the recent names that comes to mind. Last year, a Cummins build of his was voted our 2022 Diesel of the Year winner. Being audience elected, our readers were impressed with his cleanly put together compound-turbo 6.7L Cummins Engine.

The Las Vegas shop recently expanded to a 17,500 sq.-ft. space where they provide a number of diesel services like custom tuning, engine rebuilds, turbo upgrades, suspension lift kits, and custom paint. They’ll do just about anything when it comes to customizing 4-wheeled off-road vehicles; they’ve even started a sister company that handles UTV builds.

Almost a year later, and we’ve found another Sin City-built 6.7L Cummins engine to feature in our Diesel of the Week series. This time, it was built for customer Austin Ouellette.

“I had been wanting to do a diesel build and I contacted a friend’s shop to do it for me,” Austin says. “He didn’t really want to do anything with commonrails though, so he suggested I call Frank. Anyways, I put my truck with no engine in it in my trailer and dropped it off to him along with an engine block and a box of parts. He’s done a real good job with it.”

Austin works as a field mechanic in Phoenix fixing up diesel cranes, tractors, and light pickups, and formerly worked in the mines in northern Nevada for Komatsu. He’s no stranger to diesel work, and even built a few “budget” 12-valve builds when he was in the Air Force.

With the long hours and travel associated with his current career, Austin found it best to enlist the help of Sin City Diesel on the build of his 6.7L Cummins powered ’08 Ram 2500.

The engine features a fire-ringed block, ARP 625 head studs, a ported cylinder head, D&J freeze plugs, Wagler Street Fighter rods, D&J tool steel wrist pins, fly-cut factory Mahle pistons, and a Hamilton 188/220 camshaft with flat tappets.

When it came to the turbocharger, Austin decided on a Midwest CRT dual ball-bearing S480, sporting a 96mm compressor wheel and a 1.15 T6 housing. This provides the necessary boost to reach his power goals. The truck was making just under 900 horsepower before the turbo was installed, and Austin bets that number is now somewhere between 1,000-1,200 horsepower.

For fueling, Austin opted for Dynomite Diesel’s 200% over injectors, complemented by two stock pumps – a Cummins lower pump and a Duramax upper pump. To add an extra kick of power, Austin included a Nitrous Express stacker three kit with a 250-hp shot.

“I’m eventually going to go with a single, 14mm fuel pump, but as of right now I’m just leaving it with two stock pumps since we’re still getting all the tuning down,” he says. “It’s not a race truck, just a fun weekend-warrior-type build.”

Diesel of the Week is sponsored by AMSOIL. If you have an engine you’d like to highlight in this series, please email Engine Builder Editor Greg Jones at [email protected].

You May Also Like

Triple-Turbo 6.6L LLY Duramax Engine

The LLY Duramax often catches some flak for having overheating issues, but that doesn’t stop some people from using it in their one-off diesel builds. Thomas even went as far as putting triple-turbos on his engine!

“This truck is pretty much what got me into the diesel side of things,” says Thomas, a welder turned diesel enthusiast. “I just started cruising the forums, watching a lot of the videos and how-to’s and asking questions."

Tom's journey didn't start with a background as a mechanic or an automotive engineer like some. He was a welder and would take on various jobs, from fabrication to repairs. Tom's passion for diesel work began when he acquired his 2006 Chevrolet Colorado. Ever since, he’s been completing all the work on the truck himself in his garage.

Triple-Turbo 12-Valve Cummins Engine

Resurrecting an old Dodge truck that had rolled down a mountain, Mike Martin’s “Franken Truck” has undergone quite the transformation. The build features a triple-turbo 12-valve Cummins engine, and it’s only the beginning of Martin’s plans for the build. Check it out!

Turbocharged 5.9L 12-Valve Cummins Engine

Logan Yelton’s ’93 Dodge has gone through quite the transformation. It was once used to transport him and his wife to prom back in the day to now burning rubber on the drag strip with 1,800 horsepower on command. This 5.9L 12-valve Cummins-powered monster has done it all. See what went into the build!

393 cid Billet Cummins Engine

When it comes to power, the engine propelling Scheid Diesel’s drag car doesn’t dissapoint. It makes 2,800 horsepower on fuel alone… no wonder it’s a record setter!

Turbocharged LML Durmax Dragster

Everybody loves a good diesel dragster! Paul Vasko’s is an LML Duramax, complete with a GT55 turbo, a heap of nitrous, and a number of other additions that make this build an absolute powerhouse.

Other Posts

Engine Builder Magazine’s 2023 America’s Best Engine Shop Winners

Engine Builder magazine has announced the three winners of its 2023 America’s Best Engine Shops contest, sponsored by The ArmaKleen Company and Safety-Kleen. The three winners, Noonan Race Engineering (Race), Warren Diesel Injection (Diesel) and 955 Automotive (Vintage), accepted their awards during Engine Builder’s PRI Party, sponsored by The ArmaKleen Company and Safety-Kleen, at Tin

Engine Builder Magazine Announces 2023 Diesel of the Year Winner

Engine Builder magazine has announced its annual Diesel of the Year winning engine – a Billet 7.0L Powerstroke – based on the 6.0L platform and built by Jared Alderson of Kill Devil Diesel in Poplar Branch, NC. Members of Kill Devil Diesel accepted the Diesel of the Year award at Engine Builder’s PRI Party, sponsored

Engine Builder Magazine Announces 2023 Engine of the Year Winner

Engine Builder magazine has announced its annual Engine of the Year winner for 2023 – a Twin-Turbo 5.0L Coyote engine – built by Joe Irwin of Fast Forward Race Engines in New Port Richey, FL. Joe Irwin and his team accepted the award at Engine Builder’s PRI Party, sponsored by The ArmaKleen Company and Safety-Kleen,

Tyler Hewett’s 6.0L Powerstroke Mustang

We love seeing something out of the ordinary, and at this past summer’s Ultimate Callout Challenge, we got to spend a few minutes with Tyler Hewett talking to him about his love for the Powerstroke platform and the reasons he stuffed a 6.0L into a Mustang. It’s our Diesel of the Week! Related Articles –