Speed SF’s First Enduro Goes Off Without a Hitch

Endurance racing is the next step for many HPDE drivers who want to try their hand at wheel-to-wheel racing. The long sessions, the greater emphasis on strategy, and the ability to share a car make it easier to find a seat, generally speaking. We recognized that some of our talented HPDE drivers, some of whom already have been racing in other long-distance series, might be willing to take the leap into a new style of enduro if we helped them stick the landing.

So we brought our most experienced drivers together to brainstorm. After several months of revisiting various rulebooks and taking a look at the greater range of driving experience we had among our regulars, we devised a plan for an accommodating, competitive endurance format that would not break the bank. Endurance racing can be very expensive, but it doesn’t have to be.

Our loose rules are meant to be easily understood, keep barriers to entry low, and welcome a wide range of driving talent and vehicle performance. Tire choices, horsepower, and weight are all left open. Tires are open as well, as long as they’ll last a 2.5-hour race. There isn’t a restriction on driver count, either — some brave souls can run solo if they choose to.

The one mandatory pit stop is timed at seven minutes. We want to make sure the teams have plenty of time to safely refuel and remain hydrated. It also evens out the playing field; the high budget teams can’t take advantage of a fast refilling system and the low budget teams behind.

As for the regulations, we allow vehicles that pass the safety standards of NASA, SCCA, Lucky Dog, and other major endurance racing series. The vehicle will need to pass our safety tech inspection.

Drivers are required to hold a race license from another approved organization, though we can make exceptions. For drivers without a racing license, as with LeMons, Lucky Dog, and Chump Car drivers; we require they have experience in wheel-to-wheel racing or advanced open-passing run groups with Speed SF track day events. Essentially, they must have a long-standing record showing they are capable of racing in close proximity to others.

The classing is easy and straightforward. It’s based only on the car’s capabilities and the drivers’ performance during the event.

Whatever the time set in qualifying must be adhered to in the race. Essentially, that time cannot be beaten by an established delta or a penalty will be issued. The first infraction will incur a drive-through penalty; the second, a two-minute hold in the pits; the third, a five-minute hold; and the fourth, disqualification. We can also force the team to change class, depending on how much faster their race pace is. Sandbagging is something we hope to avoid.

Last weekend, we put these plans to the test at Thunderhill Raceway Park.After collecting the qualifying lap times from our 21 different cars that day, we established the parameters that would determine which team would run in which class.

Class A: 1:55 - 1:59

Class B: 2:00 - 2:05

Class C: 2:06+

The drivers on the cusp then decided whether to push their car to race in the faster class or dial back to race in the slower group — to push for total dominance or take the conservative approach. Strategy (as well as reliability and consistency) is what decides an endurance race, and our drivers were forced to make a choice that morning.

We started our race at 8 AM, the coolest time of the day, as we wanted to reduce the effects of heat on both drivers and vehicles. Many drivers appreciated that.

Class A and overall winner Daniel Rose had competed in many sprint races in NASA before this, but only a few endurance races. He had his worries about running an enduro, since they aren’t always the best organized, but that wasn’t the case here.

“Speed SF has always been a good host for the track day events, and I’m happy I did it because the enduro was really well organized; everyone knew what they needed to do. Sometimes things can get a little hectic with these kinds of races, but everything was well explained to the drivers that morning.

The classes were split just right — the competition at the front was intense and I had to stay sharp since I was running solo. Thankfully, my car ran well the whole race and went without a single hiccup, but I made one mistake — I drove over some oil in T3 and went into the dirt, but nothing major. Still, with how close it was until the end, I had no idea where that mistake put me. We pitted at the right time, I kept consistent with my lap times, I put my head down, and we came out on top. Group A win and first overall!”

“As far as I heard from everyone else in the paddock, everyone was happy with the class sorting,” Rose added.

Coming in second in Class A were Maxwell Lisovsky and Nate Hackman, who put the plan together at the very last minute. “Maxwell called me on his way down from The Ridge. He needed a co-driver. I’d never driven the car before,” Nate said. He wasn’t filled with confidence, but he took the opportunity.

The two met at Thunderhill and crossed their fingers. Max’s TT2-spec E36 wasn’t built to endurance specs, so he had to sort out a few things during qualifying.

Nate, with fifteen minutes to get a feel for a car he’d never driven before, jumped in and put the car on pole with a time of 1:54. With such a strong start, he decided to start the race and battled door-to-door through four consecutive corners over the first lap to take the lead.

“I really didn’t want to blow the motor in the first stint, so I short-shifted the whole time,” Nate admitted — a sensible approach to getting a time attack car to last 2.5 hours. Even leaving the car in fifth gear for half of the lap, he could set consecutive lap times in the 1:55s.

With a healthy lead, Nate made the mistake of beating his qualifying pace in the race — excusable considering his inexperience with the car — and had to serve a five-second penalty. While in the pits, Daniel snuck by and held onto the lead.

Considering the fact Maxwell and Nate had “no real plans, no communication, and no execution,” as the latter put it, their performance deserves a tip of the hat. Turns out the “send it and pray” approach, even with a time attack car, can yield impressive results in a medium-length race.

Abdul Osmani, a regular Lucky Dog endurance racer and the only solo driver on the Class A podium, also challenged Daniel through much of the race. “I found the 2.5 hour-length perfect. In comparison to my experiences with longer enduros, the 2.5-hour format makes logistics and planning simple and cost effective. It’s almost like a really long advanced DE session,” he said.

Joe McGuigan, regular endurance racer and Speed SF Challenge winner, used the enduro to shake down his newly acquired E46 M3 and get an idea of its fuel burn rate. As his co-driver Don signed on for twenty laps tops, Joe felt he’d leave some on the table, run in Class B, and use the track time to identify any possible problems with his new car.

The M3 had pace, though, and Joe beat Speed SF favorites Gary Yeung and Yunni Zhai to the win by a lap. The M3 proved more economical than he’d planned, so he finished his two hour-long stints with a few gallons left in the tank. The fact that he was able to run an endurance race without having to spend more money to buy a high-capacity fuel cell is just another way this medium-length race lowers the barriers to entry; a fully-built endurance car isn’t necessary for a race of this length.

At 10:30 that morning, the checkered flag flew and we could breathe a sigh of relief — our first endurance race was a success. A total of 21 cars entered and 19 finished. Considering the heat that weekend, not to mention the added strain of a medium-length race, that finishing rate speaks highly of our drivers and their level of preparation.

We’re in the middle of planning next year’s season of endurance racing. but waiting on confirmation from our regular tracks before we publish what we hope will be a very busy 2025 calendar. In the meantime, we’ll be using the race data from this event to create better classing rules that will accommodate an even wider range of drivers and vehicles.

Seeing our dedicated drivers take the next step into racing and proving themselves in a new environment makes planning these events worth the extra effort.

Class A Winners:

1st Daniel Rose BMW E46

2nd Maxwell Lisovsky / Nate Hackman BMW E46

3rd Abdul Osmani BMW E46

Class B Winners:

1st Joe McGuigan / Don BMW E46

2nd Gary Yeung / Yunni Zhai Nissan 350z

3rd Nicolas Voordeckers Funduro Speedster

Class C Winners:

1st Michael McColligan Honda Civic

2nd David Vodden Honda Civic

3rd Becky / Niki Arsham Honda Civic

Results

Near-Win at the 25 Hours of Thunderhill: Team Tazio Ottis Racing's Day-Long Battle

Four days before Friday’s Final Practice, Team Tazio Ottis Racing was treated to a reassuring practice at Sonoma Raceway with Speed SF Track Events. It had been the cherry on the sundae after a successful season in WERC E0.

The second year of competition had given Tazio and his team to sort out their FK8 Civic Type R. Their transmission, the FK8’s weak link, had been fortified with stronger third and fourth gears, which has served them well the whole season.

Concerned for the health of the drivetrain, they decided to cap the power at a healthy and reliable 300 horsepower and seek out more speed by reducing the total wet weight to 2,850 pounds with Seibon carbon parts and a titanium Remark exhaust. Along with that car, they had a team of four strong drivers: Tazio Ottis and Daniel Wu, the team’s regulars, aided by Patrick Chio (Speed SF) and Will Wattawongkiri (WRTeknica) for the 25.

Unfortunately, they seemed to have snagged a bad part. During final practice for the 25, third gear blew. After a successful season without gearbox issues, it came as a surprise.

The team was stretched thin hustling to repair the box with a used third gear—one with eighty race hours on it. The effort took them until 11:30 that night, and the delay had kept them from attending qualifying and relegated them to the last position on the grid. Thankfully, they had a long race ahead of them.

Rolling around to take the green flag in last, Will Wattawongkiri was feeling the weight on his shoulders. All of a sudden, the car wouldn’t move. It turned out the driveshaft wasn’t seated properly, so it came out and they brought the car back in the pits and lost six laps. Clearly they weren’t off the start that they wanted.

There was something to lift their spirits, though: the speed was there. Compared to their main rivals on the DIG Motorsport team, their pace was comparable and so their fuel economy was superior. Perhaps the Mustang’s dry performance was better, but things didn’t stay dry long enough for them to benefit much.

The weather was tricky; starting wet, staying wet, and eventually drying slowly, but the Honda was well suited to these conditions. An OS Giken differential and the added weight over the driven wheels helped when the track was slippery. All this was more impressive by the fact that the hasty gearbox repair kept them from getting a good alignment. As a result, they had to swap the fronts out every two hours.

With a prediction of thirty percent rain a little before midnight, they opted for their grooved Toyo RRs—their dry tires. “The difference in lap times was as much as twenty-three seconds, but it was a little risky to go to dries. The dry line was obvious, but it was extremely cold and wet off-line. Passing off the dry line would result in a massive loss of traction, so we had to pick their passes especially carefully,” Patrick said.

Thankfully, they gambled intelligently. In the slippery conditions, the Civic enjoyed a real advantage over the DIG Mustang, which struggled to put the power down. Additionally, the team’s overall pace—very similar across all four drivers— was not limited by the equipment. “We never had to soft pedal the whole race—we all pushed really hard,” Tazio noted.

TTOR were clawing their way back to the front of their race when the fuel started dropping to a worrying level and the fog rolled across the surface. When the fog was deemed thick enough to warrant postponing the race, they had to park the car on the front straight and leave it alone until the race resumed.

“We were catching up lap by lap until three in the morning when the fog rolled in. We were only two laps down when the race was stopped,” Patrick said.

Around 7 AM, the conditions were deemed acceptable for a restart. The team gathered around their new car and stuck Patrick Chio in the seat.

Their Type R had parked on the right side of the track and DIG’s Mustang had parked on the left. A prototype ahead stalled at the restart and boxed the left lane, though that hadn’t stopped the NASA marshall from continuing to wave the right line to move, resulting in a reshuffling of the grid that didn’t sit too well with the DIG team. However, the Civic needed to refuel and had to pit as soon as the green flag dropped. (Note: During a full course yellow condition, the pit lane is closed, prohibiting any team to do any work on their vehicles).

Around that time, DIG lodged a protest about passing during the restart, which Tazio and the team chose to debate initially, but did not persist in fighting the call. They accepted the compromise presented to them: a half-penalty drive through, which they served an hour afterwards.

Thankfully, they could make up for this minor setback. The similar pace among the TTOR drivers meant none of them had to double-stint. To improve matters, they could lap fast enough to push DIG’s fastest driver into running a triple stint and driving quite defensively. The Type R was catching up lap after lap and finally when, with Will Wattawongkiri at the wheel, they eventually passed the DIG Mustang in the twenty-third hour; giving them the class lead and a ninth-place-overall standing.

The actual action in some endurance races only lasts a dozen laps, but that was not the case here. Tazio enjoyed a multi-lap battle with DIG’s Michael Whelden. “Michael was making his car very wide and I was trying to get in his head by flashing my high beams. Honestly, that whole stint felt like a sprint race!”

Roughly one hundred minutes from the end, TTOR made their final pit stop. While stuck in the pits, the DIG Mustang regained the lead of E0, though they hadn’t yet pitted for refuel and we were aiming to repass them and lead the race til the end. They planned to pass; pace was still very strong—until third and fourth gear broke . They had to back off, using fifth in most places, minding the car, and watching their delta grow and grow.

Fifty minutes from the finish, they had to make a decision. “We could have continued running in fifth gear, but the transmission was making a lot of noise. We wanted to avoid blowing up the gearbox and leaving oil all over the track, so we decided to retire the car,” Patrick explained.

“It just made sense. Plus, we wouldn’t have been able to make up the deficit. It was the right thing to do at that point,” Tazio added.

“While we spent many hours in preparation for the race, picked great endurance components, hired a lineup of strong drivers, our team executed perfect pit stops, the 25 was not guaranteed—it never is. The mechanical failures during the last hour made our hearts sink, and we still feel the pain of losing—we were so close to crossing the finish line in first place,” Patrick reflected.

“We couldn’t have done it without our excellent crew and our sponsors. We’ve learned a lot about the car and the competition, and we’ll come back stronger next year.”

Thanks to all who supported TTOR:

Aventon E-Bikes

Honda Performance Development

Toyo Tires

Greddy

Seibon

Inozetek

Titan 7 wheels

Paragon Performance Brakes

Clutch Masters

Hybrid Racing

PTP Turbo Blankets

OS Giken

APR Performance

Remark Exhaust

Student Driver

Speed SF

WRTeknica