Cody’s C6 Z06: Father-Son Duo Builds Best Of Both Worlds

Being a GM development driver comes with a few perks. In addition to the privilege of getting flown around the world to test interesting new machines, one of the less obvious pros to this line of work is being able to cement a relationship with your father when he decides to turn his Corvette into a special sort of track toy.

Cody Bulkley’s education and career facilitated the development of his dad’s C6 Z06 — a project ten years in the making. His background has helped him from being swayed by forumthink, as the idea of a clubsport build isn’t always encouraged by the armchair authorities. Some claim that the best of both worlds just can’t be attained and, in actual fact, any attempt will result in something that performs poorly on street and track. Cody thought otherwise.

In his mind, a reasonably modern car can be versatile enough to drive three-hundred miles to a track, compete with caged cars, and drive home in relative comfort, but it’s not an easy balance to strike. It takes a special sort of patience and technical insight to arrive at this compromise.

During his five years in a dual bachelor’s program at the Oregon Institute of Technology, Cody joined the school’s FSAE program, which later led him towards a role in the performance end of the automotive industry. General Motors hired him as a chassis integration engineer and he joined the team that developed the C8 Corvette. Concurrently, his dad picked up the Z06 with the intention of turning it into a serious track toy. With all Cody had gleaned from his job, he had to get involved.

“The easy answer to building a track car is to throw a set of Penskes, a cage, and full aero at the car and call it a day, but we couldn’t do that. Dad drives the car to work regularly, so we had to make it more than a back-breaking trailered car.”

While that was a tall order with a relatively spartan and simplistic performance car, the C6 Z06 has good bones, and proved to be much more versatile than he had originally believed.

The first order of business, as his father requested, was increasing power, which was followed by the attendant challenges of cooling a hot-rodded powertrain. A big cam, a ported intake manifold, upgraded trunion rockers, bronze guides, race lifters, ported and polished heads, and long tube headers added another two hundred horsepower to the tally.

To enjoy some 700 horsepower on hot days, the father-son duo had to labor over the cooling package. After plenty of deliberation, the two installed a GSpeed dual oil cooler, Spal fans, a C&R radiator with the GSpeed C7 fan kit, and an LG Motorsports vented hood. Along with engine coolers, they added a GSpeed power steering cooler and a Turn One power steering pump.

The dual-wishbone setup needs little to make it work well with wide tires and a good deal of lateral load.

To keep the car civilized enough for stoplight-to-stoplight driving, they pulled a few OEM products from the Vette parts catalog, including a C6 ZR1’s torque tube, a C7 ZR1’s clutch and mated them to an RPM-built transmission, which has proven capable of handling the power.

Its 600 lb-ft of torque and 7,100-rpm redline would make a 4,000-pound vehicle feel frighteningly fast, but this Z06 weights in at 3,150 pounds without driver. Not many can outgun this car on straighter sections, but many modern cars could make better use of the power — at least before Cody went to work on the suspension.

The combination of stock suspension and big power left Cody with no leeway. Its sudden breakaway made it difficult to attack faster corners, and when the road surface varied much, it didn’t inspire confidence. Along with the optimized spring rates for their LG coilovers and the GM T1 bars at their softest settings, they installed a Wavetrac torsen-style differential. “That diff made all the difference. It made it possible to finesse the throttle. We found a second with that one modification alone, easily. All these touches have made it progressive in the power-down phase, and that’s why I’ve been able to find most of its time in the high-speed sections.”

Subtle aero mods helps this car slip under the radar while encouraging faith at higher speeds.

It has to be said that, despite its stockish silhouette, the aerodynamics have been massaged, though only a little. Nevertheless, the resulting improvement of the center of pressure helped improve the car’s performance in faster sections. “Originally, it was a little aero-loose,” Cody began, “but we moved its pivot point rearward with a rear wing, wickers, and a big front splitter for balance.”

Thankfully — and making the finer points of this process is due to Cody’s education — the improvement in stability didn’t come with any detriment to livability. “We’ve kept all the factory rubber to keep it semi-civilized,” Cody said.

“We had to replace the front and rear brakes with a set of AP Racing six and four-piston brakes, respectively, but they last a long time. OK, we have to pay the Corvette tax in tires, but we’re able to stretch a set of Supercar 3Rs through four or five weekends.”

That combination of moderate weight and mega power has produced lap times that modern supercars and a few full-on race cars might struggle to meet, as seen below:

Not to add insult to injury, but the current lap times don’t tell the whole story. Cody’s personal best at Laguna Seca was set with a failing clutch, and his best at Thunderhill was set on a 90-degree day. When all their stars align, the Corvette may run a couple seconds faster at the featured tracks.

And this very car was driven to and from the track. Cody’s dad even takes it on work trips to Washington State every blue moon, and it still hurts feelings. “As I said, it’s not easy to find that balance between street and track, but we’ve been able to compete with plenty of caged race cars in what is truly a street car. As we incrementally improve the car, we are aiming at setting several class records across West Coast time attack organizations,” Cody concluded.

I'd like to give a big thanks to Roger, Jamie, and Gary for helping me tear down and rebuild the car over the last decade. Couldn’t have done it without you guys.

Justin's IS F: Rekindling An Old Romance

Photo: Nolan Muna

Justin had his first shot at track days back in 2003, but that one afternoon at Thunderhill East in his 7th generation Celica GTS would be the last time he’d set a tire on track for nearly twenty years. Still, he managed to set a 2:15 at that event, so at least he had demonstrated his chops in the process.

Then life intervened. Marriage, children, divorce, and other financial priorities forced him to put his racing aspirations on the back burner for the better part of two decades. During his seventeen-year sabbatical, he dabbled with motorcycles and a third-generation Mazda RX-7, but never took either to the track.

Once the kids grew up, Justin saw an opportunity to return to the track. Then the pandemic hit, and to make matters worse, he lost his job. For a bitter moment, his chance to return to tracking seemed to fall just out of reach. Rather than fall prey to despair, Justin began consulting, then went into business with a close friend. Fortunately, that career move proved lucrative.

So much so that he could suddenly consider several supercars. “I debated between an NSX and an R8,” he said, “until my fiance made a suggestion. She said, ‘Instead of dumping a lot of money into one of those, why not buy a cheaper car you can modify your own way?/”

Cogent question. Justin started considering the criteria he was looking for in a mid-tier car. Reliable, large displacement, naturally aspirated, and as he thought longer and longer, he grew to like the idea of a four-door. He cast his mind back to a stoplight-to-stoplight race during the time he was driving his RX-7. “I remember an IS F totally smoked me,” he recalled. Seemed like the big Lexus sedan fit the bill.

And so he started scouring the more reputable classifieds. There wasn’t much he’d find that seemed like a suitable candidate. Ironically, it was only after four fruitless months that he capitulated and started scrolling through the Craigslist pages, where he only spent a few minutes before finding the perfect car. Better yet, it was parked just a little down the street from Justin’s house.

With only 77,000 on the clock, one owner, and complete service records tucked neatly away in a binder, this immaculate machine held a lot of promise. However, Justin being a prudent guy, he had his friend at Magnussen’s Toyota inspect the car to be certain it was the gem it appeared to be. After performing the PPI, his friend told him, “If you don’t buy this car, I will.”

Justin didn’t give him the chance. With his new acquisition sitting pretty in his garage, Justin began researching what a track-ready IS F had over his bone stock example. At the very least, any set of performance shocks and brake pads would keep it from falling on its face. However, Justin being well connected in the industry, he splurged for the fancier stuff: Carbotech XP10 pads, Michelin PS4S, and HKS Hipermax coilovers.

His return to the track—Buttonwillow this time—after seventeen years away was comically carefree. “It’s just like riding a bike,'' he told himself. He set out brimming with pride and excitement, but he quickly realized just how tire technology had come in the last two decades—and how rusty he truly was. After dropping two wheels at the exit of Bus Stop, he reigned in some of his exuberance and started to drive much more sensibly. “It was eye opening and humbling, to say the least.”

A trip to Thunderhill West a few weeks later was not only humbling, but dispiriting. The IS F’s inability, so he thought, to handle the constant barrage of corners put him in a foul mood. In fact, he was considering abandoning the platform that day at a somber lunch.

Post-meal, he found a little more encouragement from the car and managed not only to stick in a respectable 1:33, but he executed a spectacular pass around the outside of Joe McGuigan, who was then riding shotgun in a student’s car.

Two months later, he had his 22/20k setup that convinced him to give the platform a fighting chance.

Joe, another proponent of the Lexus sport sedans, could see by the IS F’s bucking-bronco body language that the damping was insufficient for the workout Justin was putting it through. Following Joe’s recommendation, Justin reached out to Shaftworks and ordered a custom set of coilovers to suit the heavyweight.

“That’s when it spiraled,” he laughed. Along with those new coils, he picked up Ultra Racing chassis braces, FIGS arms and bushings, Sikky swaybars, and a few other items that stiffened the chassis to the point he could drive the car as aggressively and accurately as he hoped. Of course, the newfound cornering forces required some additional core support for the driver, so he threw in a Recaro Profi XL.

It didn’t take long before he had to fortify the platform again. With all the extra energy he was putting into his wheeling, the tires and brakes were struggling to keep up. “I tried RT660s, but they got greasy too fast. I spoke with a Camaro owner who recommended Goodyear Supercar 3s and figured I’d try ‘em.”

Now that the car’s sorted and sweet, he has to be careful not to overdrive the car. “It will do what you want, provided you keep it within a certain window,” he added.

Wrapped around a new set of Momo Catania wheels measuring 18x10”, he was thrilled with the newfound consistency these new tires provided him. “Once they’re warm, they remain at the same temperature for the rest of the day—it’s a little like cooking with a cast iron skillet.”

Naturally, the added grip strained the binders to the point of developing stress fractures and mirroring some. In their place, Justin added a set of GS F calipers, bigger OEM Brembo rotors, and a set of Carbotech XP12s to bring everything up to a dependable par.

Swept away by the rate of development and the improvements he was enjoying, Justin asked himself, ‘What could it hurt to have a little more power?’

With a custom tune from Tuned by LOI, full bolt-ons, and a tankful of E30, the 5.0-liter made a very healthy 438 horsepower and 401 lb-ft at the rear wheels. To make the most of this bump in grunt, he added a Sikky carbon driveshaft and an OS Giken 1.5-way LSD.

With the level of funding he’s put into this machine, Justin decided to make this former heavyweight into a svelte track-only sedan—and is leaving it to the pros to help realize its potential. Additional cooling, a welded cage, and some lightweight body panels are just a few of the additions Race Factory will be making this summer.

If all goes to plan, he’ll be trailering this beauty to several shakedowns next year before entering in Global Time Attack, where he hopes to make a splash in the Street Class. With the good luck he’s had thus far and the wise McGuigan to guide him on his way, he has a shot at making some waves with this (perhaps former) heavyweight.

“I just want to thank my family, friends, and the car community for being so supportive. Without all three, my return to motorsports wouldn't have been anywhere as fulfilling as it has been.”

Photo: Nolan Muna

Justin's Moore's Mustang GT: Practicality Pays Dividends

In its earliest state, Justin had wrapped the Mustang in highlighter yellow.

Justin Moore figured this time around, he’d save himself a little misery. Exchange some sentimental attachment for peace of mind, keep your ass in the seat, and drive the wheels off it. What is it? “It’s a piece of expendable athletic equipment,” he declares. That’s the way he feels about his 2011 Mustang GT. Not quite the passion project his big STI was, this Ford has proven to him that there are other aims in motorsport outside of manifesting the vehicle he saw in his teenage dreams.

The Mustang wasn’t the first dependable track vehicle he bought. Prior to this, he’d been autocrossing a 987.1 Cayman S with a few minor tweaks. Though the two got along beautifully, the thought of an IMS failure or a big crash in the Porsche left him feeling a little tense. 

Rather than risk it, he sold the Porsche and consulted the knowledgeable Tony Rodriguez. “I wanted something that was fast, fairly cheap, fun, and fuss-free.” Basically, the costs had to be restricted to consumables for the platform to work. There were a few possibilities, but Tony and Justin agreed fairly quickly on the Mustang.

Most of the chassis modifications he’s chosen are second-hand, including the homemade splitter and the APR rear wing. 

Soon enough, there was a new car in his driveway. With Tony’s guidance, the put together a fairly lengthy list of modifications: big wheels and tires, a few aero pieces, and a set of pads. The S3 rules at the time limited the tire width, but he learned to drive around the resulting understeer and got on with getting regular seat time. 

Though the mechanical grip wasn’t really satisfactory, the combination of that and the aerodynamic download ended up ruining a motor. Oil starvation is never fun, but Justin didn’t sit with his head in his hands. Instead, he contacted Mark Luton and laid out a very basic plan for the replacement lump. 

For Phase 2, Justin shed the yellow wrap.

Justin calls it “Stock Engine-Plus,” but that doesn’t really paint much of a picture. MMR made sure that the motor could handle track abuse and lateral loading. Included in the parts list is an expanded oil pan, an Accusump, and all the ARP hardware to make the motor more resilient. Of course, a few bolt-on modifications and a tune by Ed Susman helped raise the power output to a respectable 480 horsepower at the rear wheels. It’s also held up to all the abuse Justin’s put it through in the past two years.

After the motor came back, the rules changed. Now the SpeedSF Challenge rules allowed wider tires and the option of slicks without a big points hit, so Justin moved on from his 285-width Nankang AR1s to a set of Hoosier A7s measuring 315, and the handling balance shifted dramatically. “I used to deal with the understeer, which made me angry. Now, it’s neutral, forgiving, and much faster. Wider tires were exactly what this car needed.”

Getting the handling balance right also required leaning the front tires in some—about 3.6 degrees of negative camber. There’s not much one can do to improve the solid rear axle in that respect, so he dropped the rear as much as he could without scraping. Along with a Watts Link and a soft enough setup has given him enough grip and predictability to get airborne and continue attacking.

This handling balance and reliability allowed Justin to grow along with the car. “It was never scary—and not just on the track. There wasn’t a need to ever worry about much, and so I could relax and focus on the driving side of things.”

That approach paid off. Currently, Justin’s leading the S3 Championship and hoping to secure the title. All he’s had to do is build a motor—not a meager expense, but still a simple fix. Well, there were the modifications he had to make to his air-oil separator, but that’d have to be classified as a minor annoyance rather than anything that could turn hair gray. The rest has been sweet and simple.

Times

• Thunderhill Cyclone: 1:57.465 (Speed SF record)

• Thunderhill Bypass: 1:56.494

• Thunderhill West: 1:20.610

• Buttonwillow 13CW: 1:54.516

• Laguna Seca: 1:36.938

Modifications

• ST Suspension coilovers

• Whiteline Watts link and front bar

• Forgestar wheels 18x12”

• Kooks long tube headers and x-pipe

• C and J intake

• custom air-oil separator

• custom hood vents

• Ford Performance crate motor with MMR-built bottom end.

• ARP hardware

• Ford Performance oil pump

• Accusump

• MMR baffled oil pan

• Ford Performance trans cooler

• 3.55 final drive and rear end fluid expansion reservoir

• lightweight radiator support subframe connector

• APR GTC300 rear wing

• Custom birch splitter

• Boss 302 lower front fascia for brake ducts

• Brembo Performance Package brakes

• DBA brake rotors

• Fidanza clutch assembly

• steel braided clutch lines

• Hawk DTC-60 brake pads

• Holley dual fuel pump upgrade

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.