Dodge Cummins Diesel Drag Truck

A 1,500-hp Monster of a Drag Truck

When Skyler Oestreich of Spirit Lake, Idaho decided to build a Dodge Cummins diesel drag truck, he went all-in. While the Ram would still be configured like a normal diesel (four-wheel drive, stock-style suspension and body) virtually every single part on the ‘07 Ram has been modified for performance, reliability, or power. It takes quite a lot of work to transform a 16-second stocker into a 9-second screamer, and Skyler was nice enough to walk us through the entire build.

The heart of any fast diesel is the powerplant, and Skyler had a good platform to start with in a 5.9L Cummins engine. Since the entire engine would be rebuilt, Skyler started with a clean sheet, just using the block and nothing else. From there the engine was fitted with ARP main studs which secure a 6.7L crank, and give the engine a little added displacement. Diamond Pistons forged pistons were also added, and connected to the crankshaft with rods from D&J Precision Machine. Skyler used ARP 625 studs to secure a ported head to the short block, and the entire camshaft and valvetrain assembly is from Hamilton Cams.

Skyler has a leg-up on the competition in the power department because he builds high-performance injectors for Dynomite Diesel Products. This meant he could carefully select the exact pump and injector setup he needed for the truck. Starting with a FASS 290gph lift pump, Skyler then added twin 12mm CP3 pumps from Dynomite Diesel, which feeds a set of custom “Super Mental” 250-percent over injectors also from DDP. Tuning for the truck is done through Breakout Performance. For airflow, Skyler relied on the simple combination of a single 80mm turbocharger and a whole lot of nitrous, with a Turbosmart wastegate keeping boost in check at 60 psi.

Transmission

The Ram makes power–lots of it–but going down a track is definitely different than just running on a dyno. Here Skyler went with an interesting combination of manual and electric parts to achieve success, based around the factory 48RE transmission. For starters, Skyler had Dynamic Transmission replace all three factory shafts with aftermarket pieces from TCS. The intermediate shaft is standard-sized but the input and output are both oversized for strength. Power from the engine is transferred to the transmission via a DPC quad-disc converter that keeps everything locked once engaged. The shifting is quite a clever arrangement, as missed shifts can be common when dealing with the factory computer. To combat this, Skyler installed a manual valvebody from Goerend Transmission that is electronically shifted via a Shiftnoid shifter and through tuning from Breakout Performance. This insures 4,750-rpm shifts every time as the truck goes down the track.

Chassis

When it comes to the suspension and axles, what’s impressive is what’s not done. Skyler has achieved 1.42 60-foot times with little tricks here and there, but with no radical changes. The rear axle has had Yukon axle shafts and a Grizzly locker added for strength, but retains the factory 3.73 gears. The truck has also been slightly lowered, as coils were cut in the front, and the rear only rides on two leaf springs, but on Viking double-adjustable shocks.

Dodge Cummins On A Diet

At more than 7,500-pounds from the factory, Dodge Cummins diesels have weight as their mortal enemy. Skyler sought to combat this hindrance too, with a complete gutting of the entire truck. Only bedsides remain of the rear bed, while the cab and front end also feature extensive weight reduction. All of the factory glass was replaced with Lexan, which saved hundreds of pounds. Even with the 8.50-cert full rollcage (that Skyler built himself) the truck comes in at a svelte 5,800 pounds, and that’s with driver.

So the big question is, did all of this add up to performance? You bet it did! With all three stages of nitrous flowing, the Dodge Cummins diesel has made an impressive 1,564 rwhp on a chassis dyno, and quickly dipped into the 10s, then the 9s at the dragstrip. With a current best of 9.60 at 145 mph, Skyler’s diesel is quicker and faster than many gas rides out there, at nearly twice the weight! Skyler had a goal in mind, and he quickly accomplished it. Next up, the 8s!

AN EVERCHANGING PROPOSITION

When we talked to Skyler last, he indicated that his truck has yet again gone through a transformation. He cut another 400 pounds of weight out of the Dodge Cummins by removing the factory sheet metal and switching to lightweight Wilwood brakes, and 16-inch wheels. A new wrap also gave the truck a new look, and a quick-spooling 88mm Garrett turbocharger was added. We guess he wasn’t kidding about wanting that 8.99 timeslip!

FREQUENTLY ASKED QUESTIONS

How does the lighter race weight of older diesel trucks benefit drag racing?

In the world of drag racing, every pound counts. The lighter weight of older diesel trucks offers distinct advantages for racers looking to maximize their speed and performance on the track.

Enhanced Speed and Acceleration

1. Reduced Weight, Increased Speed: Older diesel trucks, such as those from the late ’90s to early 2000s, weigh less than their modern counterparts. This is crucial in drag racing, where lighter vehicles can accelerate faster, thanks to less mass needing propulsion.
2. Efficient Power-to-Weight Ratio: With less weight, these older models benefit from a more efficient power-to-weight ratio. This means that the engine’s power can focus more on acceleration rather than overcoming excess weight, resulting in quicker sprints and improved overall performance.

Structural Simplicity

• Less Structural Reinforcement: Unlike newer trucks, older models didn’t have to compensate for heavy towing capacities. As a result, they avoid the extra weight of reinforced frames and suspension systems, which are great for towing but not necessary on the drag strip.

Better Handling and Performance

• Maneuverability: A lighter truck is more nimble, allowing for better handling during races. This can be a game-changer when precision is just as important as speed.

In summary, the reduced weight of older diesel trucks gives them a significant edge in drag racing by boosting acceleration, optimizing the power-to-weight ratio, and enhancing handling. This makes them a strategic choice for racers seeking a competitive advantage.

What are the benefits of using a single CP3 pump and a single turbo setup in diesel drag racing?

Benefits of Single CP3 Pump and Single Turbo Setup in Diesel Drag Racing

The evolution of common-rail injection technology has revolutionized diesel drag racing, offering racers simplified and cost-effective solutions without sacrificing performance. One standout advancement in this arena is the ability to use a single CP3 pump, modified to a 14mm stroke, to support up to 1,500 horsepower. This eliminates the need for multiple high-pressure fuel pumps, which not only reduces costs but also streamlines the engine setup. Fewer components mean less maintenance and potentially fewer points of failure, enhancing reliability on the track.

Similarly, the trend of using a single large turbocharger instead of multiple smaller ones, as in compound setups, has gained popularity. This shift is supported by advancements in 4-valve cylinder heads and the availability of larger displacement engines. These improvements facilitate the driving of larger turbos, offering substantial power boosts without overly complex configurations.

Key Advantages:

• Cost Efficiency: Reduce the overall expense by using fewer components.
• Simplified Setup: A streamlined engine configuration aids in easier maintenance and troubleshooting.
• Improved Reliability: Fewer mechanical parts potentially decrease the likelihood of system failures.
• Power Gains: Exploit the capabilities of modern engines and turbochargers for increased horsepower.

By choosing a single CP3 pump and turbo setup, racers can optimize their performance while maintaining a practical and efficient racing machine.

How important are tires in diesel drag racing, and which tires are commonly used?

The truck is propelled forward by four Hoosier DR2 drag radials that claw at the pavement. They’re mounted on 18×10-inch wheels.

Tires are a crucial element in diesel drag racing, often determining whether a truck can effectively transfer its power to the track. On the drag strip, a well-chosen set of tires can mean the difference between victory and disappointment. Many racers opt for tires that offer both street performance and track reliability, ensuring they can compete in various bracket categories.

In addition to the Hoosier DR2s, racers frequently use drag radials and all-terrain options, each providing unique advantages. Drag radials offer maximum grip and consistency during high-speed runs, while all-terrain tires allow for versatility across different surfaces. This choice is pivotal, as it directly impacts a truck’s ability to maintain traction and achieve optimal launch speeds.

When selecting tires, competitors weigh factors such as tread pattern, compound, and size to tailor their setup to the specific demands of diesel drag racing. This strategic selection underscores the importance of tires in achieving peak performance on the strip.

Why are these specific tires chosen by racers?

Racers choose these tires for their proven performance, adaptability, and ability to handle both street and track conditions effectively.

What kind of events feature these tires?

These tires are prominently seen at ODSS races, which are organized drag racing events that take place during the summer months.

What is the typical usage of these tires?

These tires are typically used both on the street and at the race track, indicating their versatility and reliability for everyday and competitive driving.

What are some commonly used tire models in diesel drag racing?

Popular tire models include Nitto’s NT420V, NT555 RII drag radial, and occasionally the Terra Grappler G2 all-terrain, which are favored by many racers.

How important are tires in diesel drag racing?

Tires play a crucial role in the performance of diesel vehicles at the drag strip, as they significantly influence traction and speed.

How do modern ECMs and aftermarket software enhance the performance of diesel drag trucks?

To combat this, Skyler installed a manual valvebody from Goerend Transmission that is electronically shifted via a Shiftnoid shifter and through tuning from Breakout Performance. This insures 4,750-rpm shifts every time as the truck goes down the track.

But the enhancements don’t stop there. Modern ECMs, paired with advanced aftermarket software, play a crucial role in elevating diesel drag truck performance. By allowing precise control over fuel injection systems, drivers can achieve more consistent launches and repeatable 60-foot times—an essential factor in maintaining a competitive edge.

Moreover, the ability to finely tune the system enables progressive adjustments in timing and fuel quantity, even multiple times within the first 60 feet. This ensures optimal traction and adaptability on the track. Such precision and control are vital in the quest for victory, as repeatability and consistency are the keys to winning rounds and ultimately championships.

What is the broader impact of these technologies on racing success?

By enhancing consistency and repeatability, these technologies are instrumental in achieving consistent round wins, ultimately contributing to championship victories.

How can ECMs and software adjustments help maintain traction during a race?

These technologies offer the ability to adjust timing and fuel quantity dynamically, ensuring that traction is maintained even under the demanding conditions of a drag race.

How do these technologies contribute to consistent performance in drag racing?

The precise control over the injection system results in more reliable launches and repeatable performance metrics, which are crucial for maintaining competitive edge in drag racing.

How do ECMs and aftermarket software enable precise control over fuel injection systems?

Advanced ECMs and aftermarket software options allow for meticulous adjustments to the fuel injection system, enabling it to reach its full potential in various racing scenarios.