Triple Turbo 6.7L Cummins Engine - Engine Builder Magazine

Triple Turbo 6.7L Cummins Engine

Competing in the 2020 King of the Street for the first time, Unrivaled Diesel showed up to the diesel challenge with a 2007 Dodge Ram 3500 and this triple turbo 6.7L Cummins under the hood. Find out what is in the build helping it make well over 2,000 hp!

Diesel of the Week is presented by

We recently attended the 2020 King of the Street Challenge held in West Salem, OH at Dragway 42. The competition, promoted by Smoke & Speed, was the third annual running of the diesel challenge, which pits diesel trucks up against one another in five different performance events – drag racing, dirt drags, sled pulling, a dyno competition, and a 100-mile street drive.

Ohio offered up a perfect weekend for the 2020 King of the Street (KOS) and we got an invite to attend the high-horsepower excitement. That’s where we met Chris Patterson, owner of Unrivaled Diesel in Weatherford, TX. Chris and his team were new to the KOS Challenge this year, but they were none-the-less eager and excited to see how their truck, a 2007 Dodge Ram 3500, could do.

Unrivaled Diesel specializes in Cummins work for everything from high-performance street builds and competition builds to regular maintenance and repair. The shop does its own engines, transmissions, turbos and fabrication work. Patterson says they can do it all, with the exception of tuning and cage work.

Chris’ 2007 Dodge Ram 3500 was originally a 5.9L Laramie, which Patterson jokes was pretty nice until he got it.

“We put a 6.7L in it, Flux Diesel 330% comp hybrid injectors, two 14mm Exergy race pumps, triple 472 turbos, a couple kits of nitrous, and we came out here to King of the Street hoping to do 2,100-2,200 horsepower, run some low 6-second passes, pull 300-some feet, and dominate,” Patterson told us.

While this 6.7L Cummins engine had a bunch of goodies on the outside helping it make tons of power, the build started with a stock 6.7L Cummins block, but that was about all that was stock on it.

“We used Apex triple-beam billet rods, wide-bowl pistons, a ported cylinder head done by us with a Banks Big Hoss side draft, 14mm head studs, a girdle, a Hamilton 188/220 camshaft, and full Manton valvetrain with roller rockers and everything,” Patterson says.

There’s no doubt this 6.7L Cummins was built for big performance, but the key to Unrivaled Diesel’s set up was the engine’s triple turbos.

“They’re definitely small and they spool up quick,” he says. “We have a wastegate and we’ve tuned a lot with that and we’ve really made it to our advantage. I feel a lot of guys aren’t properly utilizing them. This set up is sweet, small and spools up quick. It’s hard on engine parts, but it’s been working pretty good for us.”

Whether competitor’s engines are running well entering the challenge is one thing, but they have to make it through five competitions that make up the KOS Challenge in order to earn points and a chance at the prize money.

“It’s a 100-mile street cruise, 1/8th-mile drag race, a dyno horsepower-only competition, a dirt drag, and a sled pull,” he says. “I’m obviously a dually. I’m probably the heaviest here. I’ll probably be one of the top three in horsepower, so I feel like my advantage is going to be dirt drag with the weight and six tires, as well as the sled pull with the weight and six tires.

“I’m not going to be on the top edge of the drag race, but I’ll be up there, and hopefully I’ll be one of the top two or three in horsepower and the street cruise should be easy, because we street drive this thing all the time.”

When the dust settled on the 2020 KOS Challenge, unfortunately, things didn’t go according to plan for Unrivaled Diesel. After running an impressive 6.38 in the 1/8mile to start the event in fourth place, the truck had issues after that. However, we know Chris and his team will look things over and be ready for more high-horsepower fun real soon.

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

You May Also Like

Twin-Turbo 5.9L Cummins-Powered Lamborghini

The last thing that comes to mind when thinking of a Lamborghini is a diesel engine, but that apparently wasn’t the case for the guys at 1 Way Diesel Performance…

In the world of performance engine building and racing, engine swaps have become commonplace – but every so often someone decides to do something crazy enough that it captures the attention of automotive fans everywhere. Some of the particularly odd, yet interesting, amalgamations happen when builders decide to swap a diesel engine into a more exotic sports car.

Compound Turbo 6.7L Cummins Engine

Many of the guys at the top of the diesel sled-pulling totem pole often use the 6.7L Cummins for their builds, both for its reliability and efficient power making potential. Michael Brown just finished up work on this Cummins that he’ll be using this year at events like King of the Street. Check it out!

Billet 6.0L Powerstroke Engine

Leave it to Jared Alderson and the guys at Kill Devil Diesel to build a kickass Powerstroke engine! This competition-level, billet aluminum 6.0L will be going under the hood of KC Turbo’s truck for the upcoming race season. Check it out!

Compound Turbo 6.7L Enforcer Engine

The popularity of D&J Precision Machine’s Enforcer series engine can’t be understated. We checked this one out at the 2022 PRI Show.

Coffman Starter 24-Valve 5.9L Cummins Engine

This 24-valve 5.9L Cummins is your average workhorse build for pulling trailers… until you learn about the Coffman-inspired starter James Crutcher built for this engine.

Other Posts

Choate Engineering Performance’s 6.7L Powerstroke Engine

Choate Engineering Performance, located in Bolivar, TN, does a ton of diesel engine remanufacturing and custom engine building. We were recently visiting the shop and got the run down of Choate’s 6.7L Powerstroke build. It’s our Diesel of the Week! Related Articles – Scott Mueller’s Supercharged 406 cid Small Block Chevy Engine – Jason Sack’s

Kill Devil Diesel’s 7.0L Billet Powerstroke Engine

The team at Kill Devil Diesel does some amazing work surrounding all light-duty diesel engines, but the Poplar Branch, NC-based shop specializes in Ford Powerstroke work. As such, they do a ton of trick stuff on 6.0L Powerstrokes, and we got a first glimpse at a billet 7.0L/6.0L Powerstroke build for Charlie Fish of KC

Intellectual Horsepower: Light & Medium Duty Diesel Replacement Parts

*Skip to the video at 1:37. Engine Builder Editor, Greg Jones, talks to Paul Kelly from Maxiforce and Bryan Menke from R&R Engine and Machine about “Light to Medium Duty Diesel Engine Parts.” From skid steers to back hoes and mini excavators, these machines are being used at a high rate and are often in

Nitrous Update

The use of nitrous oxide in diesel engines is not a new concept. In fact, it has been used in drag racing for decades. However, it is only in recent years that it has gained widespread popularity in the worlds of diesel truck pulling and drag racing. Now, it seems as if almost everyone in the competitive scene is using it.