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How Japan’s Fastest Cars Were Built in a Cowshed

How Japan’s Fastest Cars Were Built in a Cowshed

Past Gas Dec 08, 2025 51 min
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About this episode

The episode dives into the fascinating history of H-K-S, one of Japan's most iconic tuning companies, which started in a cowshed near Mount Fuji. Founders Hiroyuki Hasagawa and Gochi Kitagawa revolutionized the Japanese automotive scene by introducing turbocharging to everyday cars when most saw them as mere commuters. The discussion covers H-K-S's innovative spirit, its rise in motorsport, and the cultural impact it has had on car enthusiasts globally. With notable anecdotes about their groundbreaking products and racing successes, the episode highlights how H-K-S has remained at the forefront of automotive performance for decades.

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Company

HKS

"This week we're talking H-K-S. It's not just a random collection of words in the alphabet. It's one of the most influential and coolest Japanese tuners of all time."

HKS is a company from Japan that makes parts to make cars faster and perform better. They're famous for their work with many types of cars, especially Japanese ones.

Car

Honda Civic

"But before every car meet had at least one Honda Civic with an unmistakable purple logo on the side, H-K-S was a risk."

The Honda Civic is a small car that many people like because it's dependable and can be made to go faster with upgrades. It's often seen at car meets.

Term

boost

"H-K-S was strapping turbos to them, cranking the boost, and rewriting the rules of what a four-cylinder engine could do."

Boost is a term used to describe how much extra air pressure a turbo adds to an engine. More boost usually means more power, but it has to be managed carefully.

Part

supercharger

"That's a supercharger. Nice. I don't know if you can tell."

A supercharger helps an engine produce more power by pushing in extra air, which lets it burn more fuel. This makes the car go faster.

Car

GT-R

"...group A, GT-Rs and even an airplane at some point."

The Nissan GT-R is a fast sports car that is very popular among car enthusiasts. It is known for being powerful and has a history of winning races.

Car

Subaru Wrx

"They had a fully built, like, new Subaru WRX. Very cool."

The Subaru WRX is a fast car made for racing and driving on different types of roads. It has a powerful engine and all-wheel drive, which helps it handle well in various conditions.

Term

Group A

"...The Group A car?"

Group A is a type of racing where regular cars are modified to compete. It helped create some very famous racing cars.

Concept

Fuji Speedway

"...symbolized by the opening of Fuji Speedway in 1965. The track quickly became a beacon for motorsport fans,..."

Fuji Speedway is a well-known racetrack in Japan where many car races happen. It opened in 1965 and helped make car racing more popular in Japan.

Car

Toyota Celica

"...ns, cars like the Nissan Skyline GT-R, the Toyota Celica, the Mazda Cosmo, and Datsun Fairlady Z."
Car

Datsun Fairlady Z

"the Mazda Cosmo, and Datsun Fairlady Z."

The Datsun Fairlady Z is a well-loved sports car famous for its speed and sleek design. It's part of a series of cars that many people admire.

Car

Mazda Cosmo

"the Mazda Cosmo, and Datsun Fairlady Z."

The Mazda Cosmo is a sports car known for its unique rotary engine, which is different from traditional engines. It's famous among car fans for its design and performance.

Car

Nissan Fairlady Z

"...R, the Toyota Celica, the Mazda Cosmo, and Datsun Fairlady Z. That was the first rotary Mazda, right?"

The Nissan Fairlady Z is a sporty car that has been around since the 1960s. It's loved for being fast and stylish, making it a favorite among car fans.

Term

rotary engine

"That was the first rotary Mazda, right?"

A rotary engine is a type of engine that works differently from regular engines. Instead of pistons moving up and down, it has a spinning design that helps it run smoothly.

Term

Wangan Midnight

"it's really funny, in Wangan Midnight, the arcade game, that's the fastest car."

Wangan Midnight is an arcade game where you race cars on a famous highway in Japan. It's all about going fast and tuning your car for better performance.

Car

Mazda Miata

"It's tiny. It's like the size of a Miata. I really like it because it's not a big car."

The Mazda Miata is a small, fun sports car that seats two people. It's known for being light and easy to drive, making it popular with car lovers.

Concept

performance potential

"These cars had enormous performance potential, but due to Japan's strict regulations, they were heavily restricted for street use."

Performance potential is about how fast and well a car can drive. Some cars can go really fast and handle turns better than others, which makes them more fun to drive.

Term

OEMs

"While the OEMs, or original equipment manufacturers, offered safe and reliable cars, there was a growing community of enthusiasts hungry to unlock more performance."

OEMs are the companies that make the original parts for cars. For example, if you buy a car, the parts that come with it are made by the OEM.

Company

Summit Racing

"In the United States, the performance aftermarket was already well established, with companies like Summit Racing and Edelbrock offering bolt-on horsepower to anyone with a wrench and a dream."

Summit Racing is a store where people can buy parts to make their cars faster and perform better. They have many options for anyone who wants to upgrade their vehicle.

Company

Edelbrock

"In the United States, the performance aftermarket was already well established, with companies like Summit Racing and Edelbrock offering bolt-on horsepower to anyone with a wrench and a dream."

Edelbrock is a brand that makes parts to help cars run better and faster. They are especially famous for their engine parts that help cars get more power.

Concept

performance tuning

"The mission was simple but bold, to become Japan's first dedicated performance tuning company, one that served the unmet desires of everyday drivers and racers alike."

Performance tuning is when people change parts of their cars to make them faster or handle better. It's common among car enthusiasts and racers who want to improve their vehicles.

Part

turbocharger

"...one of the most technically demanding and misunderstood engine components of the time, the turbocharger. Ooh!"

A turbocharger helps an engine produce more power without making it bigger. It uses the exhaust from the engine to pull in more air, which helps burn more fuel and creates more power.

Term

turbocharging

"Turbos are very uncommon in production cars at this point. I think that Jetfire was like one of the only American cars that had one. They were more common in like diesels and yeah, aircraft as well. At a time when turbocharging was mostly reserved"

Turbocharging is a way to make an engine more powerful by forcing more air into it. This helps the engine burn more fuel and produce more power without needing a bigger engine.

Car

Nissan Skyline L20SU

"One designed for Japanese performance icons like the Nissan Skyline L20SU, the Toyota Celica 18RG..."

The Nissan Skyline L20SU is a type of car that many car fans like because it's fast and can be modified easily.

Term

global oil crisis

"The year was 1973 and the global oil crisis had just sent a shockwave through the automotive world. Consumers and manufacturers alike were pivoting towards fuel efficiency..."

The global oil crisis was a time when oil prices went up a lot, making people want cars that used less fuel. This changed how car companies made their vehicles.

Term

fuel efficiency

"...consumers and manufacturers alike were pivoting towards fuel efficiency and more conservative design."

Fuel efficiency means how well a car uses fuel. Cars that are fuel-efficient can go further on less gas, which became important during the oil crisis.

Part

bolt-on turbo kit

"...HKS released its first major product, a bolt-on turbo kit for the Nissan L20 engine."

A bolt-on turbo kit is a set of parts that you can easily attach to your car's engine to make it faster. It doesn't require a lot of complicated changes to the engine.

Term

turbo kits

"It was one of the first commercially available turbo kits in Japan and offered substantial power gains, boosting the L20's output from a modest 112 to approximately 160 horsepower, which was a 70% increase."

A turbo kit is a set of parts that helps make a car's engine more powerful by forcing in more air. This can make the car go faster without needing a new engine.

Term

horsepower

"...boosting the L20's output from a modest 112 to approximately 160 horsepower, which was a 70% increase."

Horsepower is a way to measure how powerful an engine is. More horsepower usually means the car can go faster and perform better.

Term

turbo lag

"Though early kits suffered from issues like turbo lag and occasional overheating, they provided real repeatable performance, something no other company in Japan was offering at the time."

Turbo lag is the time it takes for a turbocharger to start working after you press the gas pedal. It can make a car feel slow to respond at first.

Term

overheating

"Though early kits suffered from issues like turbo lag and occasional overheating, they provided real repeatable performance, something no other company in Japan was offering at the time."

Overheating happens when a car's engine gets too hot, which can cause problems. It can be due to issues like not enough coolant or a broken part in the cooling system.

Car

Nissan Silvia S15

"...my buddy, Vic, he had his S15. We drove out to see him together."

The Nissan Silvia S15 is a sporty car that many people love to modify and race. It's known for being fun to drive and has a strong following among car fans.

Term

turbo timer

"...I didn't realize he had a turbo timer and he just like parked his car and like got out and walked away. Yeah. I was like, it's still running."

A turbo timer helps protect the turbocharger by keeping the car running for a little while after you park it. This is important because turbochargers can get very hot, and letting them cool down helps them last longer.

Car

Porsche 911 Turbo

"... begin until 1975 with the release of the Porsche 911 Turbo. HKS was already in it,"

The Porsche 911 Turbo is a fast and stylish sports car that started being sold in 1975. It's known for being very powerful and fun to drive, making it a favorite among car enthusiasts.

Car

Jeep Renegade

"Now this wasn't a sanctioned series, but rather a renegade motorsport subculture obsessed with achieving one..."

The Jeep Renegade is a small SUV that can drive well both in the city and on rough roads. It's designed for people who want a car that can do a bit of everything.

Car

Chevrolet Camaro

"Yeah. And I believe there was a Camaro as well. There's a Z31 engine."

The Chevrolet Camaro is a sporty car that has been around since 1966. It's known for being fast and having a cool design, making it popular among people who love cars.

Car

Toyota Supra

"...ily tuned Celica XX, known overseas as the Celica Supra, they began to break the 300 kilometer per hour b..."

The Toyota Supra is a well-known sports car that became popular in the 1990s. It's famous for being fast and can be modified to go even faster, which makes it a favorite among car fans.

Car

BMW Z4

"...e a Dooley. Did you see the Supra that they put a Z4 front end on? What?"

The BMW Z4 is a fancy sports car that looks great and is fun to drive. It's available as a convertible, which means you can take the roof off, making it a nice choice for sunny days.

Car

Chevrolet Corvette

"...is pretty convenient. So for context, the 1984 C4 Corvette with double the displacement made only about 205 ..."

The Chevrolet Corvette is a classic American sports car that started being made in 1953. The C4 model from 1984 is known for its unique look and good performance, making it a popular choice for sports car lovers.

Car

Peugeot 205 T16

"...ry machines like the Audi Quattro and the Peugeot 205 T16. So, Asagawa made a bold move."

The Peugeot 205 T16 is a special car made for racing in the 1980s. It's known for being very fast and winning many races, making it an important part of car history.

Car

Peugeot 205

"... legendary machines like the Audi Quattro and the Peugeot 205 T16. So, Asagawa made a bold move."
Car

Audi Quattro

"...racing thanks to legendary machines like the Audi Quattro and the Peugeot 205 T16. So, Asagawa made a bold ..."
Car

Mitsubishi Pajero

"He extracted the transfer case from a Mitsubishi Pajero SUV and integrated it into the Starian"
Car

Ford Ranger

"... range of vehicles from SUVs, light trucks to the ranger. When we were out in Baja, we lost our spares"

The Ford Ranger is a smaller pickup truck that many people use for work and play. It's known for being tough and useful, making it a good option for those who need a truck without it being too big.

Car

Subaru Baja

"..., light trucks to the ranger. When we were out in Baja, we lost our spares and ended up running the same..."

The Subaru Baja is a mix between a small truck and an SUV that was made from 2003 to 2006. It's known for being able to handle different types of roads and is useful for carrying things.

Car

Mitsubishi Lancer

"...build of the decade, the HKS CT230R, based on the Mitsubishi Lancer Evo 9. The CT230R featured a fully built 4G63 eng..."

The Mitsubishi Lancer Evolution, or Evo for short, is a fast version of a regular car called the Lancer. It's popular for its ability to handle well on the road and is often used in racing.

Car

Kia Soul

"...s a legacy brand stay relevant without losing its soul? Their answer was not to retreat from innovation,"

The Kia Soul is a small car that has a unique boxy shape. It's popular because it's affordable and has a lot of room inside, making it a good choice for many drivers.

Car

Toyota 86

"...forms, including turbo kits for vehicles like the Toyota 86 and hybrid-compatible ECUs."

The Toyota Corolla is a very popular car that has been around since 1966. It's known for being reliable and getting good gas mileage, making it a great choice for everyday driving.

Car

Toyota GR Yaris

"...ferent company. My favorite recent HKS car is the GR Yaris that they built with a huge, like, wide body on i..."

The Toyota GR Yaris is a fast version of the regular Yaris car, made for racing. It's known for being fun to drive and has a powerful engine, which makes it popular among car lovers.

24 cars featured

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