Lap 87 at Wheatland, Missouri. Bobby Pierce, who started fourteenth in a field of thirty on a three-eighths-mile surface that had gone completely slick and shiny by intermission, threads the needle past Jonathan Davenport and disappears. Seventy-five thousand dollars. That is the Show-Me 100. This is The Dirt Debrief. I'm HUNTER, with Hast on the call. Tonight — Pierce's move, what the track did between hot laps and lap 87, and the Black Book column on invisible weight: fuel slosh, driver shift, driveline wind-up — the stuff that changes your car on lap 12 when nothing changed on the car. This is The Dirt Debrief. Hunter, with you.
HUNTER Let's run the week. The big one first — the 34th Show-Me 100 at Lucas Oil Speedway in Wheatland went to Bobby Pierce, who started fourteenth and led the final thirteen laps of a hundred-lap feature to cash the seventy-five-thousand-dollar check. Jonathan Davenport led early and had the car to beat most of the night, Josh Rice worked the top groove hard in the prelim and actually won the Cowboy Classic on Friday — ten grand for Rice — but on Saturday in the main event, the track went away from the top and Pierce found the bottom lane at the exact moment it started to give. Meanwhile in High Limit sprint car action, Aaron Reutzel picked up his fifth win of the season at Grandview Speedway Tuesday night, that's five wins in the last eight races for the Clute, Texas pilot, and this is a man who is absolutely locked in right now — dominant at Route 66 earlier in the year, now cleaning up in the northeast.
HAST And Hast on that note — Reutzel's Grandview win was not exactly clean, he actually lost the lead to Rico Abreu with seven laps to go when Abreu blew by him in traffic, and then a red flag came out and wiped the pass, which put Reutzel back on the point for the restart, and he held on for the twenty-thousand-dollar check — his fifth High Limit win of the season. Abreu settled for second, Chase Dietz ran a career-best third at the one-third-mile oval, and Kasey Kahne came home fourth for Macri Motorsports. World of Outlaws side, David Gravel is still sitting on top of the sprint car points, and the series just ran Knoxville and Huset's for the Stars and Stripes Memorial Day weekend — twenty grand to win each night.
HUNTER Here's what I want to dig into tonight, and it connects directly to what happened at Wheatland, because the Black Book this week — May twenty-second — is titled Weight You Cannot See. Fuel slosh. Driver position. Driveline wind-up. The weight that moves during the race that was never on the scale, and why your car changes on lap twelve when nothing changed on the car. That is the exact story of the Show-Me 100. Bobby Pierce's car on lap eighty-seven was not the same car Jonathan Davenport had to deal with on lap one — the fuel load was down almost a full tank, the balance had shifted rearward, the driveline had been cycling through wind-up and release for eighty-seven laps, and the track surface itself had lost all the rubber it picked up during intermission and gone back to a blue-grooved slick. Pierce read all of that. Davenport was still fighting the car he set up for lap one.
HAST Right, and what I keep coming back to is the fuel slosh piece specifically, because on a three-eighths-mile with a thirty-gallon fuel cell sloshing through short-radius corners, you can have four to six pounds of lateral weight transfer happening inside the chassis that your scales never saw on the pre-race sheet. The crew chief set the stagger, set the left-rear bite, checked the j-bar height — all of it calibrated for static weight — and then the green drops and every corner that fuel load shifts, the contact patch on the left-front loads and unloads on a different cycle than the setup was built for. By lap twelve, the car is lying to the driver about what it can actually do. The Black Book nails it when it talks about why the car changes on lap twelve when nothing changed on the car — because plenty changed, just none of it with a wrench.
HUNTER And the driveline wind-up is the part nobody wants to write down, which is exactly why the column exists. A dirt late model under acceleration on a tacky-to-slick track is constantly winding torsional load into the rear axle assembly, and as the surface transitions to slick and the throttle application point moves later in the corner, that wind-up releases differently — the car pushes where it used to rotate, or it snaps loose where it used to hook up, and if your crew chief is standing on the pit box looking at lap times instead of watching where the driver's right foot is in relation to the flag stand, you will never diagnose it. That is a setup problem that presents as a driver problem every single time, and lazy crews call it driver error and move on.
HAST And Pierce — to his credit — managed that transition better than anyone in the field at Wheatland on Saturday. He came from fourteenth, which means he spent the first half of the feature in traffic reading how the surface was evolving lap by lap in real time, by watching what the cars in front of him were doing in the slick, not just reacting to his own chassis feedback. By the time he had clear air and was hunting Davenport, he already had a mental map of where the bottom lane was giving and where it was not — and that is the track walk, the transition zone read, the whole thing the Black Book has been building toward all spring.
HUNTER Here's the take, and I'll own it: the Show-Me 100 result proves that ninety percent of dirt late model crews are still setting up for the car they drove in hot laps, not for the car they'll have on lap fifty. The fuel math alone should shift your j-bar measurement a full turn between hot laps and the feature, because you're carrying ten extra gallons of methanol at roughly six-point-three pounds per gallon — that's sixty-three pounds of fluid sitting in a cell that's going to slosh and burn off at a rate that changes your rear percentage every single green-flag lap. If your crew chief isn't factoring density-altitude shift at sunset plus the fuel burn curve into the feature setup, you are handing positions to the guy who did — and Bobby Pierce's team clearly did the homework that Jonathan Davenport's team apparently left in the hauler.
HAST Hold on, because I want to push back on part of that, not the fuel math — the fuel math is correct — but the implication that Davenport's team missed something feels too easy, because Davenport led laps in the Show-Me 100, fought Josh Rice for the top groove early, and was genuinely fast all weekend including the prelim nights. The car wasn't wrong — the track called an audible on them and the surface transition from tacky to slick happened faster than the DA drop at sunset would predict alone, which means the rubber window closed early and the bottom lane came alive sooner than the intermission read suggested it would. That is the fifteen-minute window problem the Black Book wrote about on April tenth — the ninety percent of racers who make the wrong call during intermission — and Davenport's team may have read the intermission data correctly and simply got burned by the track transitioning faster than the model said it would. That's not a lazy crew. That's a hard call that went sideways.
HUNTER Okay, fair — but here is where I close the loop: correct or not on the transition call, Pierce's advantage was not that he had better data at intermission, it was that he spent sixty laps in traffic recalibrating his model in real time, and the crew that wins at this level is the one that builds a driver who can communicate what the car is doing on lap forty and translate that into a setup call that's actually executable in the three minutes you have at the halfway caution. The scale sheet tells you what the car weighs standing still. The Black Book exists to tell you what happens after the green drops. That gap — between static setup and dynamic reality — is where the Show-Me 100 was won and lost at Wheatland on Saturday night.
HAST Other dirt-track results from the past week worth knowing: at Silver Dollar Speedway in Chico, California, the Fair Race Finale ran 360 sprint cars on May twenty-third — that card closed out the fair race schedule on the West Coast. Over at Circle City Raceway in Indianapolis on May twenty-first, Briggs Danner of Allentown, Pennsylvania absolutely demolished the USAC sprint car field in the Circle City Salute, winning the forty-lap feature by six-point-four-three-nine seconds — the largest winning margin in the USAC series since October 2023 — after Logan Seavey stumbled on the turn-two cushion on lap seventeen and handed Danner the lead. Seavey held on for second, Kyle Cummins came through from tenth to third, and Thomas Meseraull ran fourth in his first USAC national start of the season.
HUNTER And Danner's win was his ninth career USAC sprint car victory, which ties him with Mario Andretti on the all-time list — that's a name you file away because that man is going to win a lot more races before the summer is out. Short Track Super Series ran the King of Spring at Lebanon Valley Speedway on May twenty-first, and the Lucas Oil Speedway weekend also included the Tribute to Don and Billie Gibson preliminary feature alongside the Cowboy Classic — Josh Rice banking ten thousand dollars in the prelim, Bobby Pierce banking seventy-five thousand in the main. Wheatland was busy and the payout board was heavy.
HUNTER Quick hits: World of Outlaws ran their Stars and Stripes Salute on Memorial Day weekend — Knoxville Saturday night, Huset's Sunday night, twenty grand to win each, and David Gravel is still sitting on the points lead like he owns the deed to it. The man has won five of twenty-one World of Outlaws features this season and the data says nobody in sprint car racing is running the numbers he's running right now, so we will keep watching that. Also worth noting — High Limit has now staged at Route 66 Motor Speedway out in Amarillo and the Texas dirt scene is getting the big national money it deserves — Tanner Thorson won that Route 66 date back in March, and Reutzel has been on a wire-to-wire tear since Fort Worth in early May, where he led all thirty laps of the Stockyard Stampede at the Texas Motor Speedway dirt track.
HAST And the USAC national sprint car series heads to Knoxville Raceway on May twenty-ninth and thirtieth for the Corn Belt Clash — half-mile, fast, and Briggs Danner is going to show up absolutely loaded with confidence after dismantling a full Circle City field by six seconds, which, on a quarter-mile bullring, is not a margin — that's a statement. Cummins set a new Circle City track record in qualifying at eleven-point-six-oh-one seconds, so the speed was all there, and Danner still won by half a lap. Keep your eye on that twenty-ninth and thirtieth at Knoxville. That's the Dirt Debrief for May twenty-fifth. Bobby Pierce, seventy-five grand, Wheatland. Aaron Reutzel, five wins in eight races. And if your crew chief still thinks the scale sheet is the whole story — send them the Black Book. Find it at racer.wiki. Back next week. Hunter out.