The Setup Part III

The Hunger to Build:

My personal success at the 2026 24 Hours of Daytona didn't begin on the high banks of the Speedway; it began with a hunger to build a dependable setup. While the rest of the team looked to Petit Le Mans at Road Atlanta, my focus shifted to the crown jewel of the IMSA WeatherTech Endurance Series.

The first leg of my quest was to learn how people choose where to get their paid setups. My questions were simple:

1. Where did you get this setup?

2. Why did you choose this setup shop or source?

3. How do you know that you are getting a good setup?

As I dove into the world of paid setups I discovered a "Wild West" of inconsistent quality. When asking fellow drivers how they chose their sources or verifiy quality, the answers were unsettling. One driver noted, "Most setups are actually shared—purchased then passed around." More concerning was the response to how they knew a setup was going to be good: "I don’t really know. Some are good, some are really bad. You buy them and hope it’s good."

For me, that lack of certainty was a frustration. If I paid for something, I wanted it to be good—or at least have something to prove its worthiness. Before I put my car on the grid at Daytona, I needed to know my setup was solid, and I wanted to be able to explain why.

The IMSA Racing Challenge:

For the 2026 season, we chose the LMP2 class. Unlike the GT3 class, which boasts 16 different manufacturers, LMP2 is a "spec" class. The Dallara P217 is the only chassis allowed. During 2025, while driving GT3s at the Nürburgring and Le Mans, we felt like small fish in a big sea. Finishing P20 out of 50 was fine, but we wanted a smaller, more competitive field. While the GTP class is the upper echelon of endurance racing, I wasn’t prepared for that leap yet. Our team, ESM, felt we could better gauge our performance in a field where every car is identical. In LMP2, the only variables are the hands on the wheel and the setup in the car.

I started with the baseline medium-downforce setup and the official LMP2 user guide (my modern-day Haynes repair manual). The mission was a delicate balancing act between the infield section, the Le Mans chicane, and the long, flat-out stretches of the NASCAR oval.

A Wing, A Deck, and A Guy named Gurney

The initial hurdle was the Aero Calculator. I quickly learned the high-stakes trade-off of the rear wing angle:

• High Angle: Increased rear aero grip, but significantly lower top speeds.

• Low Angle: Higher top speeds, but a treacherous tendency for the rear end to "snap" on corner entry.

After settling on a "sweet spot" of 12 degrees, I experimented with Wing and Deck Gurneys—perpendicular flaps intended to create extra downforce through drag. Interestingly, these were a 1971 innovation by Dan Gurney and his team. After struggling with lack of grip during practice. They realized they need to do something. Riiveted scrap metal to the car during a subsequent practice fixed the grip deficiency. They had to invent creative excuses to hide the breakthrough from competitors.

In my case, the Gurneys weren't the answer. The solution lay in the geometry: adjusting front and rear ride heights finally stabilized the car on entry.

The "Coach" vs. The Crapshoot:

A few weeks in, a teammate provided a setup from a "reputable sim racing coach." I hoped for a benchmark—something I could use to compare my setup and understand how to improve.

The result was pure disappointment. It was labeled by the setup builder as "Safe," but it felt terrible. I immediately questioned myself: Was I burnt out from too much testing? Maybe it was a good setup and I just needed to adjust my driving? I tried it again days later and even had my teammate, Parker, test it. The verdict was unanimous: it was unusable.

This led me to compare specific settings using the iRacing Aero Calculator, which diagnoses:

• Downforce and Drag

• Aerodynamic Balance

• Lift vs. Downforce

Comparing the data, I could see that my numbers landed far closer to the "ideal" values set in the advanced setup guide than the professional coach’s setup did. It was a validation of the "seat of the pants" feeling that sim drivers eventually develop—a learning curve where a deep understanding of mechanical feedback replaces physical G-forces. It also validated my disdain for the paid-setup crapshoot described by other racers.

Finding Mechanical Grip:

With the aero stabilized, a new "ghost" appeared: mid-corner understeer in low-speed sections. This shifted the focus to mechanical balance, achieved through:

• Heave Spring Rates and Gaps

• Anti-Roll Bar (ARB) Stiffness

• ARB Blade Position

I tuned and tweaked for hours over the next few days. As the mechanical grip neared perfection, the car became "nervous" on cold tires, wanting to step out during laps immediately after pit stops. The handling would improve each lap until the fourth, where the nervousness vanished. With the clock ticking toward race day, I needed a fresh set of eyes to speed up the process. 

The Birth of setup 3A:

The team stepped in, and I handed them the setup, then named Daytona2025LukeESM3. Anthony contributed a pivotal adjustment to the rear ARB, and Manith fine-tuned the high- and low-speed compression and rebound dampers. Without me mentioning the out-lap nervousness, they found it and fixed it. These tweaks made the car manageable during those critical first four laps on new tires.

During an open practice just one week before the race, I noticed I was 300 RPM short of the maximum RPM in sixth gear at the end of the oval. My final adjustment allowed the aero to compress the body more at high speeds, and just like that, I found the remaining horsepower. This was the final evolution and became known as: Daytona2025LukeESM3A.

Just days before the green flag, a teammate who hadn’t been active in the previous weeks suggested a setup that he found. The team tested it, but the consensus was clear: "I like 3A better." was the unanimous response.

Setup 3A wasn't just a file; it was a collaborative effort that bonded the drivers of both ESM team cars. When we crossed the finish line at Daytona we claimed P6 and a 3rd place podium finish, it wasn't just driver talent that got us there. It was the setup.