Bennet’s C8: Driver Mod Comes First

Bennet Kao learned quickly that the Tesla Model 3 was a capable track car with the right technique. By capitalizing on its strengths — surprisingly capable brakes and its torque and traction advantages — he could stop the car in a short distance, sacrifice the mid-corner, and prioritize a strong exit to lengthen any subsequent straight.

Good traction and a favorable weight distribution make the electric heavyweight a serious contender on the track, but it’s not without its issues. The problem is the Model 3 is only good for about two hot laps before it starts to limp. Since Bennet recognized that driving skill came before a long mod list, he prioritized seat time. Posting only eight to ten laps per track day didn’t exactly constitute time well spent, so he decided to make a change to a car which weighed less than two tons.

“I figured the gen-two BRZ was the perfect segue,” he recalled. “I wanted to learn to carry momentum and drive a manual, and since this was rear-drive, I wasn’t comfortable with having too much power at first.”

He sent his new toy to TDW Auto in San Jose for their advice and mechanical expertise; having them install a pair of Stoptech big brakes, Racecomp Tarmac 2 coilovers, and a set of Kumho V730s. With how playful the car was from factory, these were the only modifications they felt were necessary.

Transitioning into a lighter, nimbler, and less powerful car was not easy; after setting times at 2:02 at Buttonwillow 13CW and 1:27 at Thunderhill West, he had to ask himself what wasn’t working. Thankfully, he had a few friends with similar setups who offered him some help. Seigo Ma, another gen-two BRZ owner, offered Bennet his passenger seat and fielded a few questions.

“I tried to focus on the exit with the Tesla. I also braked pretty late and hard with the Tesla, but I couldn’t do that in the BRZ; it would just oversteer too much. I looked at Seigo’s data and realized he was braking a little softer and a little earlier, but released the brake earlier, carried more mid-corner speed, and got back to throttle earlier. His inputs were gentler. That way, he could keep the car settled more of the time.”

Following an adjustment period working at finding more rolling speed, he started feeling himself. “I never spun that car, and I spun everything else I’d owned. It is the most forgiving car I’ve owned — you could make coffee while you corrected the oversteer,” he joked.

He whittled his Buttonwillow 13CW time down to a 1:58 and felt pleased with himself. That glow lasted until, after two dozen track days in the BRZ, he lost fourth gear. That prompted him to start looking for a replacement. “I missed the mid-engine feeling of the Tesla, but I did not miss the weight.”

Browsing an auction site one Monday afternoon, he came across a C8 Corvette with a few enticing modifications. A Brembo BM6 big brake kit and a set of four–way KW V5 coilovers would make it possible to get back to track driving that much sooner. He placed a bid, crossed his fingers, then turned off his computer and picked up his kids from school.

The following morning, he learned he’d placed the winning bid.

At Buttonwillow a month later, he left his first DE in the C8 with mixed feelings. While the car had the directness that he’d been missing, it felt like it was going to kill him half the time. “There was so much weight in the rear and the spring rates were way too soft. I kinda hated it,” he admitted. Additionally, the power steering pump seemed to struggle in high-load corners. “Going into Riverside, the steering assistance would sometimes work intermittently. I guess the pump struggles with the forces there.” Lastly, the motor would pull some power once the intake temperatures reached 230 degrees. “I could get about five hot laps a session at full power that day, but it was pretty warm.

While it wasn’t a stellar shakedown, Bennet kept his head up by maintaining his driving-first approach to driving, he recognized that his technique, even more than his setup’s shortcomings, was to blame for his unsatisfying first track experience in the C8. “I studied a few YouTube videos from other mid or rear-engine drivers and made some changes. I began to understand that this layout was not as forgiving as an FR, which meant my steering rate had to be a lot slower, and I couldn’t trailbrake as assertively as I did with FR cars. It just needed to be balanced more delicately.”

Refining his inputs helped him dial in the turn in more consistently and, crucially, settle the rear end. After all, such an incisive front end was what he’d been longing for, and with the ability to put down power much earlier than the BRZ ever could, he began to love MR driving dynamics.

With his technique honed to his car’s liking, he looked to improve the suspension for track work while keeping the car streetable. The KW V5’s default spring rate was 7kg/7kg, and while that split’s higher than stock Z51’s 4kg/5kg, it was too soft for track usage; resulting in excessive nose dive under hard braking and a lazy rear end during transitions. While researching popular spring rates for track-oriented C8s, he found that C8 Z06/Z07 has a stiffer front relative to the rear, which would help him get a flatter, better stabilized platform.

With a 14kg/10kg arrangement, as well as a bit more rebound at the rear, the C8’s setup is now neutral with a touch of oversteer. That said, having almost 60% of the weight in the rear aids in traction zones, and he’s been able to apply the throttle very early. Even with the wheels spinning, it still generates good propulsion.

Even more impressive than his ability to jump from platform to platform and adapt rapidly, Bennet wisely avoided going down the modification rabbit hole. “There’s so much to gain from focusing on the driver mod. I don’t think I’m a naturally talented driver, but I like to do my research and I studied a lot of the fast guys from Speed SF. They coached me with their onboard videos.”

One such driver claimed that the 991.2 GT3 RS was worth three times the C8 Corvette. To challenge this claim, Bennet handed his keys to the man. That was Joe McGuigan.

After returning from setting a 1:34 lap, Joe changed his tune a little.

“With the way you have it set up, it’s one of the best mid engine cars I’ve driven,” he began, “except for the brake pads — they don’t bite or modulate well,” he said. Bennet has since replaced those XP8 pads with Endless ME20.

For the foreseeable future, Bennet hopes to get as much seat time as possible — and as a father of three, all under five years of age, it’ll be hard to find the time. He’s got his work cut out for him, but his technique-forward approach should serve him well in the medium term. Maybe, once his schedule frees up and he’s learned all there is to learn from his C8’s current configuration, he’ll spring for aero, or level up and grab the Z06.

Cory’s C6 Grand Sport: Safe Not Sorry

He’d spent several years finding his feet in a Mustang, but after his friend was kind enough to let him try their Corvette Z06 at a track day, Cory Smetzler knew he had reached a junction, and although it would cost more, the prudent thing to do was to take a left turn.

The C6’s shape stimulated his imagination, and the performance was already so much more than what he’d been accustomed to; the Z06 in near-stock trim could already outperform his highly-modded Mustang. It was clear that it was time for a major change.

But Cory is a practical person, and making an expensive shift could not be justified by the C6’s soft, curving lines and wide arches alone. Pretty as it was, it was the performance package which convinced him to shell out some more coin, since its improved weight distribution, roomier wheel wells, and dead-reliable engine package promised much more fun and fewer headaches.

A set of American Racing headers bumps output to 470 horsepower and 470 lb-ft of torque at the wheels.

And pragmatism kept him from buying the same model, too. Instead of taking a chance with the Z06’s LS7 motor and its propensity to swallow a valve, he instead opted for the mid-tier Grand Sport, which loses the special motor and the aluminum frame. In their place, the Grand Sport comes with a more pedestrian LS3 and a steel frame, but for the price of less power and more weight, Cory purchased peace of mind.

Though the LS3 isn’t quite the motorsports-grade product the LS7 is, the improvements already made to this particular motor helped Cory forget about lost potential. The previous owner had installed a Dewitts radiator, a FAST 102 mm intake, a Nick Williams throttle body, as well as Doug Rippie Motorsports differential and transmission coolers.

The powerplant ran smoothly in the sweltering summer heat, though the engine lacked that zing and top-end that the other Corvette had, the mid-range torque of the mildly tuned LS3 was plenty exciting.

Mated to a TR6060 six-speed transaxle, the torquey LS3 and its 400-odd horsepower could get the car to GT3RS-speeds surprisingly quickly, so Cory wasted no time giving his new track car the stopping power and safety modifications that it warranted. He doled out the big bucks for an AP Racing Essex front brakes with 372mm rotors and inch-thick pads which guaranteed stopping power, consistency, and long pad life. No sense in taking shortcuts when stopping a heavy, powerful car.

Its accessible mid-range torque is exploitable on shorter courses and still strong enough to reach similar top speeds on faster ones. Surprisingly, the wonderful spread with the right combination of wheel size and final drive make it effortless to keep the engine humming along without the need for many shifts. This is a large part of what makes it so effective at tight tracks.

A 3,300-pound Corvette shows its shortcomings on tighter tracks. The poor motion ratio of the rear leaf springs pushed Cory to double the rear spring rate, which allows for the car to break away more progressively, and the resulting confidence from this predictable sliding helps Cory drive the car with more slip angle than he has with any other car.

The willingness to push a tail-happy car hard in the butt-clenching corners takes more than just progressive breakaway. Cory added a Nine Lives Racing single-element rear wing, mounts, endplates, front tunnels, and a homemade birch splitter added the stability he needed to trust the Corvette in fourth-gear sections at faster tracks like Sonoma.

The current setup isn’t perfect, but it’s nearly there. There’s the matter of weight to deal with, and he’d still like the rear to be better settled, but it is reliable and relatively kind to its tires, and so he’s been able to put in plenty of hassle-free track miles without going through too much rubber. Low maintenance and lots of seat time has been his credo since the start, and he’s hired Joe McGuigan to help put his philosophy to good use. With a little coaching, he’s been putting down impressive times after just a couple visits to Sonoma.

Since his recent move from the Pacific Northwest to Southern Oregon, Cory’s been able to enjoy the temperate weather and make it to track days with more energy and regularity. Seeing as how he’s been able to set impressive laps at circuits that are new to him, it’s certain he’ll be a force to be reckoned with in our Challenge series very soon. We’re happy to have him.

Thomas' Corvette: In Good Company

Finishing out his senior year of high school, Thomas DiGioacchino listened to a friend’s suggestion and scrounged the money together for his first track day. Crap tires, decent weather, and a near-stock Mustang GT were all he needed to find that thing that’s been steering his life for the last five years.

Thomas decided to pursue the mechanical side of things and enrolled in Ranken Technical College’s High Performance Technology course with a focus on Chevrolet LS engine design.

That emphasis allowed Thomas to build a motor for a car he hadn’t yet bought. It began with an iron-block LQ motor and LS1 heads, and as the LQ block only displaced 5.3 liters, he bored and honed it out to 5.7 liters to fit the LS1 head. With forged pistons and rods, oil pan baffles, and the other pieces that made it a 500-horsepower workhorse, he unknowingly set the tone for the rest of this build.

The car itself came next. During his final year at Ranken, he found himself a base 2002 Corvette within his price range and tucked it away in his side yard until graduation, when he loaded up his truck with his furniture, his motor, and began his drive from Missouri to his hometown.

Back in San Mateo, he reached out to his then-limited network for car parts and, with some luck, gainful employment as well. As he’d relied on Elite Performance to direct him towards a few bolt-ons for his Mustang, they were the natural resource to consult. One day, while speaking to Elite’s Melody Cannizzaro about getting his Corvette aligned, she provided up with a job opportunity. He didn’t have to think twice.

Working with Elite gave him access to one longtime customer who happened to be offloading some go-fast bits from their recent Corvette build. Thomas was able to grab a set of Titan 7 T-S5 wheels for peanuts, and then came big brakes, bushings, and a bucket seat. Soon, the plans for keeping the Corvette tame and civilized went out the window.

Wisely, he went for safety equipment next, and decided that this car would only help him become a truly quick driver if it was reliable first and fast second. “I knew that seat time would be the priority if I was going to run with guys like Gary Yeung,” he said.

That said, it would be silly not to make use of the big motor sitting in his parent’s backyard. Soon, it found a new home in the Corvette’s engine bay, and Thomas took the half-built C5 to its first track day, where it ran without a hiccup. It ran well the second day, too, as well as the third. Clearly, he’d paid attention in class.

Aside from the minor repairs any twenty-year-old car needs, it was the epitome of dependable. His focus was on learning to drive the car better, but, to his credit, a C5 on stock suspension does leave a lot to be desired. It would lean excessively, and under trail braking, it had a habit of snap-oversteering.

After several months of saving, Thomas bought a used set of JRZ two-ways. While he was at it, he pulled and refreshed the entire drivetrain, then upgraded the springs and clutch packs in the OE LSD. Those modifications made the Corvette much more progressive at the limit, regardless of whatever cheap tires he happened to be running.

When he found the time to fine-tune the suspension, he increased the rake to increase rotation at corner entry. A square 295-35/18 setup was the cost-conscious tire option, and he stretched every set until the cords showed. Still, the car was mostly neutral with a hint of understeer in the faster stuff thanks in part to his APR GTC-300 wing.

As his confidence grew, he started to recognize that driving around on worn rubber was no longer the training tool it had been, so he sprung for a set of AR-1s and turned his first sub-two-minute lap at Buttonwillow 13CW. “I had to fight it the whole way around, but I got 1:58. A sloppy 1:58, but still,” he said.

Good tires helped, as did having a hare to chase. With Gary Wong driving his S2000 off into the distance, Thomas was able to see where he could push harder than he believed was possible. It’s a huge help having an experienced driver luring your outside your comfort zone.

Logging that first milestone lap gave him the confidence to try the Speed SF Challenge the next weekend at Thunderhill’s five-mile configuration. He did his homework and studied several record laps, focusing on curb usage. With Gary Yeung giving him some basic feedback the day of, Thomas saw his lap times fall by as much as four seconds. In the end, he was able to clinch third place in S2 — just half a second behind Kevin Schweigert in his BMW M2.

That success turned Thomas into a sponge. His subsequent lapping days have been spent studying data and having the experienced drivers like Joe McGuigan critiquing his onboard videos. “Joe’s been a huge help; giving me pointers on which gears to use so I can put the power down more easily.” The result of this traction-conscious approach to driving is evident in the footage below:

He’s also benefited from picking a short list of prime parts. In fact, he’s never bent his Titan 7 wheels or broken any suspension parts, despite hammering curbs and dropping wheels regularly. Maybe it has something to do with emphasizing robustness with this build—a tip he picked up from his mentor, Gary Yeung.

‘I’ve learned a decade’s worth of motorsports knowledge in the last two years. Everyone’s been so supportive, and I owe my progress to all of them. They’ve pushed me to improve as a driver and a builder—especially Gary. Watching him work inspired me to raise my game, and I think it shows. My Corvette’s overbuilt, so I can push it all day. Like Mango, my Corvette is a workhorse that’s made it possible to attend almost every Speed SF event in the last two years. All I do now is change the fluids and try to find out where I can go faster.”

Parts

• JRZ motorsport coilover conversion

• Titan 7 T-S5 wheels 18x10.5”

• Trackspec hood vents

• Dewitts radiator

• Spal fans

• Improved Racing oil cooler

• Improved Racing oil pan baffles

• Prothane polyurethane bushings

• APR GTC-300 wing

• APR splitter

Matt Paige's C6 Z06: The Track Rat’s Idea of a Hybrid

Photo credit: APEX Staff Photographer @victorgiang

There’s something refreshing about watching the onboards Matt Paige posts all too infrequently to his YouTube page. It only takes a couple corners to see evidence of a well-sorted car in action. Soft turn-in, great traction, and a real sort of stability that gives him the reassurance to push hard are traits we can appreciate from the start of his lap linked below.

By addressing every performance-related department in more or less equal measure, the car has a wide array of strengths which make it a versatile machine most speed freaks can appreciate. It’s a car that’s civil enough for short drives on the street, despite being tuned and tweaked to drive full lapping sessions without worry.

The track-street mix doesn’t place much emphasis on comfort, but it does make sure the factory bodywork is retained while using the airflow over it more effectively. For instance, the rear brake ducts are repurposed to direct air towards the gearbox and differential.

The vented hood isn’t stock bodywork, but it does fit the whole scheme as it’s painted the same shade of yellow.

Up front, the LG Motorsports splitter removes the front airdam and, in conjunction with a vented hood, helps the hot air inside the engine bay evacuate. Downforce and cooling addressed in one fell swoop—all without disrupting the soft, curvaceous shape of the C6.

That two-birds-one-stone approach could be seen in the greater build objectives with this particular Corvette. First, Matt wanted to show what his company is capable of. Few cars really fill the dual-purposer role, but Laptimz Motorsports used all their knowhow and a considerable budget to make it a track guy’s idea of the ideal hybrid.

The second objective was to demonstrate the value of a track car that doesn’t prioritize outright speed. Even with the lap times it’s capable of, the build emphasis was on stress-free track work; the company aim is getting enthusiasts onto the track with minimal fretting and frustration.

For that reason, reliability came first. Matt strove to keep the temperatures low through a set of Setrab oil coolers and a G-Speed laydown radiator. To ensure steady lubrication at high lateral and longitudinal loads, he picked a dry sump system from Dailey Engineering. For a milder balance with a hint of push, he chose a staggered set of Apex VS-5RS wheels wrapped in wide rubber—315s up front and 345s in the rear.

That wide footprint easily harnesses the engine’s output, as this LS7 isn’t crazy-powerful by LS standards. With the help of American Heritage heads, a Katech Torquer cam, Katech valves, and a pretty mild exhaust, it makes 525 horsepower and 520 lb-ft of torque—more than enough shove for Sonoma and Thunderhill.

Unfortunately, the retention of the interior pieces and most all the factory bodywork makes this 3,000-pound middleweight a little heftier than most track cars of this caliber. Still, those lightweight wheels, SKF hubs, aluminum hubs, lighter AP Racing brakes, and LG Motorsports drop spindles trim some unsprung weight. It all contributes to a feeling of uninterrupted adhesion with the road beneath. After all, it’s not only about the total weight, but where it’s located.

Photo credit: Trevor Ryan

The result is a car that’s sure on its feet, urgent, stable, and somewhat progressive when it does break loose. Now, the use of a delicate right foot helps Matt stay out of trouble, but he has to tread carefully on cold tires—big 315s have a habit of letting go abruptly if they’re not brought up to temperature before getting abused.

A little Lexan, lightened footwork, and a carbon roof help this Corvette belie its weight.

Even when the car does slide, the fresher suspension and direct feeling through the wheel give Matt enough information to correct snaps and shimmies without breaking a sweat. Not even a slide through the middle of Sonoma’s Turn 10 seems daunting, as seen at 1:28 in the footage above. This surefootnedness helps Matt push hard without trepidation—and feel like a superhero in the process.

Without a doubt, we’d certainly have fuller fields if this is how all track toys were built.