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GHiT 0746:  Mark Petronis is Back

GHiT 0746: Mark Petronis is Back

Garage Heroes In Training Jan 22, 2026 60 min
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About this episode

Mark Petronis returns to share his inspiring journey of recovery and fitness transformation following a serious accident. After years of surgeries and therapy, Mark discusses his progress in regaining strength and mobility, particularly in his right hand. He details how he combined medical support with lifestyle changes, including a GLP-1 medication, to lose weight and improve his overall health. The conversation touches on the importance of consistency, discipline, and the mental aspects of fitness, making it relatable for anyone looking to make a change.

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Technical Too Afraid to Ask
Term

carbon fiber

"...you know saving 25 pounds in the race car through carbon carbons very expensive and..."

Carbon fiber is a special material that is very light and strong. It's used in race cars to make them lighter, which helps them go faster and handle better.

Car

Chevrolet Corvette

"so speaking of knowledge that you have Miss Vicki's got this small version of the Corvette right behind her"

The Corvette is a famous sports car made by Chevrolet. It's known for being fast and having a unique design, making it very popular among car enthusiasts.

Car

Mazda Miata

"it's fine so but since she's got a small Miata I thought we'd talk a little bit about the larger..."
Car

Mazda MX-5 Miata

"right so Miata is not always the answer because sometimes Corvette's the answer"

The Mazda MX-5 Miata is a small sports car that is fun to drive and easy to handle. It's known for being affordable and is loved by many car fans.

Car

Chevrolet C8

"...how fast C8 has caught on like when the C7 came out..."

The Chevrolet C8 is the latest version of the Corvette sports car, known for its new engine placement in the middle of the car, which improves handling and speed.

Part

radiator

"...it used to be you had to do radiators and you had to do oil coolers and diff coolers..."

A radiator is a part of the car that keeps the engine cool. It helps prevent the engine from getting too hot while you drive.

Part

oil cooler

"...you had to do radiators and you had to do oil coolers and diff coolers..."

An oil cooler is a part that keeps the oil in the engine from getting too hot. This helps the engine run better and last longer.

Part

differential cooler

"...you had to do radiators and you had to do oil coolers and diff coolers..."

A differential cooler helps keep a part of the car that helps the wheels turn from getting too hot. It's important for cars that do a lot of heavy work or fast driving.

Term

factory cooling

"...what the car can do factory cooling wise I did so I added a radiator but you really don't need to add much..."

Factory cooling is the cooling system that is built into a car when it's made. It's meant to keep the engine from getting too hot while driving normally.

Term

dyno graph

"...because he sent me his dyno graph but he's also a monster driver..."

A dyno graph shows how powerful an engine is at different speeds. It helps car enthusiasts see how well an engine performs.

Term

horsepower

"...makes like 40 more horsepower than mine does because he sent me his dyno graph..."

Horsepower tells you how powerful an engine is. The more horsepower a car has, the faster it can go and the better it can accelerate.

Term

VIR

"...did like a 155 at VIR on Supercar..."

VIR is a racetrack in Virginia where cars can be driven fast in a controlled environment. It's a popular spot for racing and testing car performance.

Term

Watkins Glen

"...under two minutes and either Watkins Glen or VR that's a crazy number to do it..."

Watkins Glen is another famous racetrack in New York where cars race. It's known for being challenging and exciting for drivers.

Part

eccentrics

"the one thing I told the guy like what you will need to do is change out the the eccentrics for the suspension they have the same thing that that Vicky has"

Eccentrics are parts of the car's suspension that help adjust how the wheels are positioned. This adjustment can improve how the car drives and how long the tires last.

Part

suspension

"the one thing I told the guy like what you will need to do is change out the the eccentrics for the suspension they have the same thing that that Vicky has"

The suspension is the part of the car that helps keep the ride smooth by absorbing bumps in the road. It connects the car's body to the wheels.

Part

camber kit

"...I didn't plan on making the camber kit for this car as fast as we ended up doing because I thought it was going to be robust enough that they weren't going to move on track but they absolutely do now..."

A camber kit helps change the angle of the wheels so they can grip the road better when turning. This can make the car handle better during races or on tracks.

Term

grip

"...they make so much grip now and they're heavy enough by the way the cars are..."

Grip is how well the tires stick to the road. More grip means the car can go faster around corners without sliding.

Term

3700 pounds

"...by the time you hit the track so this is a lot of force so..."

3700 pounds is how much the car weighs. The weight of a car affects how it drives and handles on the road or track.

Term

torque wrench

"...just didn't work the thing like a hit with an impact wrench but didn't actually use a torque wrench so generally..."

A torque wrench is a special tool that helps you tighten bolts to the right tightness. It's important because if bolts are too loose or too tight, it can cause problems.

Term

toe

"...so is your toe right so it's on your steering wheels all off too..."

Toe is how the wheels point compared to the center of the car. If the front of the wheels is closer together than the back, that's toe-in; if the back is closer, that's toe-out. This can change how the car drives and how quickly the tires wear out.

Car

Honda Civic

"so it was fun though we had a good time uh Civic's one of those things you gotta cross off the list even though once you go there you're like"

The Honda Civic is a small car that many people use for everyday driving. It's known for being dependable and getting good gas mileage, which makes it a smart choice for a lot of drivers.

Term

spring rate

"...it became very clear very fast and it didn't have enough spring rate so but but nobody makes a stiffer..."

Spring rate is how stiff a spring is. If a spring is stiffer, it won't compress as much when weight is put on it, which can help the car handle better but might make the ride bumpier.

Term

shocks

"...I want to have a spring that's going to work with the stock shocks like that would be a terrible idea..."

Shocks are parts that help control how much the car bounces when you go over bumps. They work with the springs to make the ride smoother and more stable.

Car

Buick Grand Sport

"...o a race car again it's probably going to be a C6 Grand Sport because that I can deal with you know where you s..."

The Buick Gran Sport is a classic car that was built for speed and performance. It's a larger car that many people admire for its powerful engine and sporty design.

Term

Limp Mode

"oh Limp Mode Limp Mode should be outlawed but that's"

Limp Mode is when your car's computer detects a problem and makes the car run slower to avoid damage. It helps you get to a mechanic without causing more issues.

4 cars featured

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