Shan's S2000: Hitting the Books

When you’ve had so many formative driving experiences in something as light as a kart, or as purposeful as a Formula SAE, many production cars feel a little cumbersome. This was Shan’s perspective and the impetus to sell his E92 M3 for something responsive, svelte, and raw.

While a college student, Shan was both powertrain lead and test driver on his Formula SAE team. As part of getting the most from their bike-powered spaceframe car, the test drivers – he was one of several – were expected to refine their driving techniques through go-karting. As his own development as a driver dovetailed nicely with his expanding understanding of chassis setup, he developed an unshakable confidence that, years later, would enable a rapid ascent in the world of time attack.

Before he could put himself in a car which would benefit from his years of racing experience, he took a left turn – one that was unpredictable, yet understandable.

He had his foray into time trials with a heavyset production car unlike the other machinery he’d grown accustomed to: an E92 M3. “There were some cars I was considering, but this one was the most versatile.”

Its heft and plush GT-designation left him feeling a little lukewarm, and after five track days, he recognized his need for something with a bit of that single-seater urgency he missed.

First kiss

Rather than go full-180° and buy another spaceframed car, a trailer, and a tow rig, he decided to compromise in the name of practicality. For him, the S2000 was the only fendered car in his price range that had the pointiness he was after. Plus, he didn’t mind hacking one up.

He found an AP2 that, while a little rough around the edges, was a suitable candidate for a track build. A little patina and some missing interior panels didn’t upset him, but the blown Konis certainly made the trek from Los Angeles back to San Francisco less than comfortable. Thankfully, he knows a good chiropractor.

However, those minor annoyances faded when he took the car to Laguna. There, he was reacquainted with all those familiar feelings from his college days — plus a new form of fear.

“I don’t think I’d ever driven something with so much lift-off oversteer before, though that was due to the setup in some part.”

The Honda had teeth; its mystery alignment kept Shan guessing when it would slide. However, even on ancient RS4s and a comically snappy setup, the car was eagerly responding to his subtler inputs. It kept him alert and, with a little time to learn its habits, it raised his confidence.

After adding the first round of track-day bolt-ons – brakes, wider wheels, and a set of forgiving NT01s – he could start exercising his old approach to finding speed. Shan had a few areas of focus:

Ergonomics

Ensuring everything is easily reached was paramount. As he learned from FSAE, the more comfortable one is, the harder they can push. For this reason, he added a very bright shift light directly in his line of sight.

Chassis first

Aside from a Hondata piggyback and a testpipe, the motor would remain stock; the gains would be made in cornering speeds.

No more than necessary

Only parts that had proven to cause a bottleneck or had failed would be replaced. This was done to save, but also to ensure his engineering abilities would be put to good use making the most of what he had.

After accepting the limitations of his Konis, he splurged on a set of JRZ RS Pros. They’d been vetted by his car-crazy colleagues. Raised to an appropriate ride height and aligned correctly, he started putting in the seat time.

The car stayed as it was for some time as Shan delved into the data and refined his technique. “I analyze my laps through RaceStudio and take very detailed setup notes after a session to make sure I'm aware of what's going on, what changes i'm making, how the car responded to those changes, etc.,” he stated.

Complex, but simplifying

When it came time to add some aerodynamic pieces, he used his analytical mind and his engineering ability to make the most of the new alterations.

“My first laps with aero weren’t much faster than my previous best,” he started. “I was still driving the car like I had been before the wings; tentative at corner entry, braking somewhat gently. The aero changed that. I used to worry about oversteering too much at turn-in, but I can throw the car into the corner now. If it needs to scrub some speed, it’ll just understeer.”

He could start changing some parts to make use of the additional aero loading. “Previously I was running a less aggressive compound in the rear because the car was prone to entry oversteer, which would only get worse if the pad compound in the rear could cause momentary locking. With the aero grip, that’s no longer an issue, so I have a high-torque pad at the rear.

Clearly, the right sort of aero helps not only with outright cornering speeds, but stability as well.

Drag bad, grip good

However, this all comes at a price; drag cannot be overlooked in a low-powered car like the S2000. Trimming the wings was vital to find a net improvement in speed, and after using the suggested window for optimal wing angles from 9LivesRacing, he timed every subsequent alteration until he found the fastest settings.

“One thing I did after the first aero day was try to visualize the corner speed increase and drag increase around Laguna. I made plots to understand the behavior better. I could reach out to people with more racing/motorsports experience too, to see if this aligned with what they would consider a car with properly functioning aero, so it was decent validation.”

Shan had to increase his spring rates by 100lb/in to handle the aerodynamic load.

Shan’s taken a studious, resourceful approach to building this gleaming AP2. It might not sport top-shelf parts in every area, but those used have been tweaked and fettled to get the most from them.

An ideal setup is only possible if one has the ability to run the necessary calculations. Shan’s background in racing a clean-sheet kind of car has helped him see what’s vital to speed, and that alone gives him an edge that primo parts alone cannot trump.

He’s clearly passionate about the engineering side of things, too. In fact, he’s used his engineering expertise to build new bits to improve the overall package. They might not be obvious, shiny, or expensive, but, in aggregate, they make a major difference.

“When I have the time, I’ve been using some of the 3D printers at work to build some basic parts to help. For example, I put together some supports to prevent the trunk from flexing at higher speeds.”

Though the car is fast and forgiving, Shan’s still seeking a sharper edge. “The front is much less effective than the rear, and, for now, I just deal with the understeer. I’ll try increasing the rear spring rates to encourage some rotation. It’s not a normal way of dealing with an aero problem, but it might work.”

He’ll find a solution — even if it keeps him in the garage all weekend. For Shan, staring at plots all Sunday to find a few tenths is time well spent.

Parts List

• Sakebomb rear sway bar, Eibach front sway bar

• Bump steer + roll center correction kits

• Recaro Profi SPG driver's seat

• JRZ RS Pro (900lb/in front, 800lb/in rear spring rate)

• Racebred Components front splitter kit

• 9LivesRacing rear wing

• Wilwood Superlite front BBK w/ Carbotech XP12 brake pads all around

• Hasport polyurethane engine and differential mounts

• Maxxis RC1 255/40-17

Alex's AP1 S2000: Earning His Spurs

Though this AP1 wasn’t Alex Caruso’s first track car, it was the car with which he truly earned his spurs. A few years before buying this car, he got his feet wet with an NA Miata, then later an Integra GSR. Thesef two taught him about car control and patience with the right foot, but they lost their appeal with time. Eventually, he wanted to try something a bit more exhilarating. By then, Alex was no longer a student just scraping by, and he had a little more to spend on a special sort of car.

When this car popped up in his feed, he immediately checked his bank balance. Hardtop, great paint, totally stock, and basically a blank slate with which he could express his creative streak. There was one problem, though: he couldn’t quite afford it. Undeterred, Alex committed to finding the money. With the help of his supportive wife, he scraped together enough for a down payment and brought it home.

Not long after, he started leafing through those old lists of dream parts he’d scrawled away when he was a daydreaming, broke college kid. The first round of mods were intended to make the motor indestructible. Because the ‘01 models didn’t receive the piston-cooling oil squirters the following year’s motor did, he retrofitted those to fit his motor, careful not to crossthread anything down there. Following that, he added AP2 valve retainers, then sent his valve covers out to be drilled; the AP1’s valve covers need to be perforated to help move some of the blowby.

Though these drilled valve covers works with the stock PCV system, Alex added a catch can—one which doesn’t need emptying until the fifth track day.

With the powertrain bulletproofed, he started running his car to the 9,000-rpm redline and enjoying the honeymoon phase, spins and all. The AP1’s nervousness was thrilling, challenging, and hugely educational—even if he had to clean plenty of grass out of his wheel wells. “Once I started pushing, I looped that thing so many times,” he laughed.

Though AP1’s dynamic toe curve kept him busy and certainly accelerated his steering corrections, he felt it prevented him from totally trusting the rear. “It almost felt like the rear was taking two sets in every corner,” he explained. In an attempt to get closer to his car and predict its movements better, he started with the second round of improvements.

Wisely, Alex went for a full set of Blacktrax sphericals, Hard Race motor mounts, and solid LSD collars. The added responsiveness and transparency of the car grew in proportion to his confidence. However, there was one glaring shortcoming he still hadn’t addressed.

That pesky toe curve could only be truly changed by swapping out the old AP1 subframe for an AP2 subframe. The first weekend out, the car was predictable and encouraging in a way Alex had never felt before, and so the second honeymoon phase began.

Never once in his four-year relationship with the car has he felt bored with the car, but he has always wondered if the wear items would let him down. To give him peace of mind, he reinforced the flimsy spot where the front upper control arm connects with the chassis. While at it, he swapped all four hubs out for Karcepts items and rid himself of another potential nightmare.

Finally, after a year of tracking his stout and predictable AP1, he started searching for more speed. The first round of go-fast goodies consisted of Sake Bomb Garage’s brake kit, a set of JRZ RS Pros, and a few engine bolt-ons—the last chosen mainly for noise.

“The coilovers really transformed the way the car handles over rough or uneven pavement. I knew the stock suspension was already well-tuned by Honda, so I didn't want to skimp on coilovers that would ruin the handling characteristics the Honda engineers worked so hard to develop. After popping my right rear upper ball joint out of its control arm coming at Laguna Seca, I knew wanted to get something that could control the chassis better without bottoming out as frequently or harshly.

I happened to make a connection with a JRZ vendor and scored a deal on a set of RS Pros. Now, not only is weight transfer much more immediate, I don't have a second thought about the car unsettling over bumps, like the Dorito at Thunderhill West. Having two-way adjustable coilovers also opens up a whole new world of suspension tuning that I'm slowly learning about. The ability to adjust the handling balance at the track and the peace of mind that the dampers will soak up any bumps I throw at them make these coilovers worth their weight in gold.”

The focus on the foundation, the time spent learning an imperfect car, and the carefully chosen selection of performance modifications all paid off in the first session following. Running on the same set of Hankook RS4s he’d used the time before, he dropped his times at Thunderhill West by two seconds.

There’s not much more this dependable car needs. It’s lively, reassuring, and while it’s not the punchiest car in the field, it is one of the most agile. Because he prioritized predictability and transparency over any other performance trait, he might opt for an aftermarket differential—Seigo Ma’s shown him how important they are. Maybe a little aero in there for good measure, but beyond that, all he needs is good weather and the time to spend with his second love.

“With how much I’d dreamed about this car before buying it, I was worried that I would be disappointed with the S2000, but I can safely say it's lived up to all of my expectations and then some. It's been rewarding to work on, to fix, to push myself with, and it's the exact tool I needed to get comfortable on track.”