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How a Simple Engine Ran 4.99 in Pro Street Diesel

How a Simple Engine Ran 4.99 in Pro Street Diesel

Power Driven Podcast Apr 14, 2026 55 min
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About this episode

A pro-street diesel truck hits 4.99 in the eighth mile, and the discussion focuses on how it’s possible without “quarter-million-dollar” complexity. The hosts break down the real tech: transmission durability at extreme power, why the 2nd-gear band is the weak link, and how pressure/speed logging helps tune shift timing and converter lockup strategy. They also cover the “tow-truck” engine approach—factory-based parts, smart coatings, and head/valvetrain choices—plus the cost/attainability shift in diesel racing. The episode ends with plans for upcoming UCC competition.

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Technical Too Afraid to Ask
Concept

4.99 seconds in the eighth mile

"And this inspiration for this video is recently Meyer went down to a test in tune and 4.99 seconds in the eighth mile in his drag race truck scratch getting ready for ultimate college challenge."

That “4.99” is how many seconds it took to run the eighth-mile (about 660 feet). Faster time means quicker acceleration and usually more power.

Concept

data log

"I mean, honestly is I checked the data log and I really only floored it for like 5.1 seconds. So right after the eighth mile..."

A data log is like a recorded report of what the truck’s systems were doing during the run. It helps them see exactly how the tune and shifts behaved.

Concept

Hail Mary passes

"...you're burning him up every past. Yeah, you're doing a Hail Mary passes like I remember that with, I mean, it's just even you guys and Josh and everything like five years ago we were going down the track and just hoping that the transmission would survive the drag race."

That phrase means they were basically taking a chance and hoping the truck would make it through the run without breaking. It implies the car wasn’t fully reliable yet.

Term

torque converter lockup clutch

"I would say the first problem I'll just throw out there is the torque converter lockup clutch drags when you're building boost at the starting line."

The lockup clutch is part of the torque converter system that helps the transmission transfer power more directly. If it starts dragging during a launch, it can overheat and wear out fast.

Term

band

"Yeah. And there's definitely some, I don't say some, like, I think a lot of people think like, oh, the band is just bands are terrible technology, clutches are way better..."

A “band” is like a friction strap inside the transmission. When it grabs, it holds a gear; when it releases, it has to let go smoothly—otherwise it slips and makes heat.

Concept

it finally hooked everything

"Oh, that's cause it finally, it finally hooked everything."

They mean the truck finally got good traction and started transferring power to the ground. Once it hooks up, the turbo can build boost the way it’s supposed to.

Term

six 20

"...you used to see, but you're like, man, I ran a six 20, but look at that mile an hour though."

“Six 20” is a quick way of saying the car ran about 6.20 seconds. That’s how long it took to cover the race distance from the start.

Term

overdrive gear

"[1166.8s] And a lot of diesel racing is traditionally eighth mile now, but if you ever want to do [1171.0s] a drag and drive event that's quarter mile, you can't run that in a turbo 400. [1175.2s] You need an overdrive gear and they don't have that."

An “overdrive gear” is a gear that lets the car go faster without the engine screaming at high RPM. That can help for longer runs where you don’t want the engine to run out of steam or get too loud/hot.

Term

RPM

"You don't have the RPM on the diesel. And so it's like, if you want to run quarter mile, you kind of need an overdrive."

RPM tells you how fast the engine is spinning. If the engine can’t spin fast enough, it can’t keep making power as you accelerate, especially in a race like the quarter mile.

Term

gear ratios

"Like a billet transfer case that you can put different gear ratios in. Which is cool."

Gear ratios are the “multipliers” between the engine and the wheels. Different ratios can make the truck accelerate harder or reach higher speed before the run ends.

Term

two, two 41 DLD transfer case

"That's got a freaking two, two 41 DLD transfer case is why not? It's got a, it's a four back in the day."

They’re talking about a specific transfer case model. The point is that this particular unit is part of why the truck can handle power and still work well with the gearing.

Term

Jagra

"Guys thought the light duty transfer cases would not hold up to Jagra."

“Jagra” appears to be a name for a vehicle, driver, or build that the speaker is using as a benchmark for torque/load. The excerpt doesn’t define it, so listeners may need context from earlier/later in the episode to know exactly what it refers to.

Term

four low

"And it's, and I got rid of the, I got rid of the four low. So it doesn't have a planetary in there or anything now."

4 Low is the “low gear” mode for 4WD that gives more pulling power at slow speeds. Removing it means the transfer case no longer has that low-range function.

Part

planetary

"So it doesn't have a planetary in there or anything now. So it's just kind of straight through..."

A planetary gearset is a compact gear arrangement used in many transfer cases to create different gear ratios, including low range. Removing the planetary gearset can simplify the unit and reduce weight, but it also removes low-range functionality.

Term

factory transfer case is 84 pounds

"And so I got rid of, I think that factory transfer case is 84 pounds. Like as reference, a DHD is a hundred pounds..."

Weight is a major factor in performance and durability, especially in motorsports. The speaker compares the factory transfer case weight to their modified setup to show how much mass they saved.

Term

microseconds

"And there's people that don't know what us. You're talking to microseconds how long with how long the injectors are pulsed on. Yep. How long the injectors pulsed on for?"

Microseconds are just a very tiny unit of time. Here, they’re talking about how long the fuel injectors stay spraying fuel during each cycle.

Term

nitrous

"And then I had, I didn't have the nitrous all the way on. I had one."

Nitrous (nitrous oxide) is an add-on system that injects oxygen-rich gas into the engine to allow more fuel to burn. It’s commonly used in drag racing to create big, short bursts of power, and the timing/solenoid control matters a lot to avoid drivability issues.

Term

piston

"And so I was like, well, I'll just coat the piston as well. [1504.0s] You know, that makes sense."

A piston is the part inside the cylinder that moves up and down. It’s under a lot of heat and pressure, so builders sometimes use stronger pistons or add coatings to help it last.

Term

ceramic coating

"We played with our coatings on there. [1556.9s] Like you said, we got a little ceramic."

A ceramic coating is a heat-resistant layer applied to parts like pistons. It helps keep the piston cooler and can make it last longer under hard use.

Term

total seal

"They're not a total seal or anything special there. You don't want to try those."

“Total Seal” refers to a higher-end piston ring design meant to seal better. Better sealing can help the engine make more consistent power and reduce blow-by.

Term

horsepower

"So this time you're at 2100 horse, but you feel like you've done 25, 2600 on a PDD crank... it was going to be 25, 2600."

Horsepower is a number that describes how much power the engine can make. They’re talking about what the engine should be making based on the parts and the tune.

Term

dyno pulls

"It's kind of like a, I've yet, I've put a lot of dyno pulls through a motor with those like the different motors I've done, never had a girdle."

A dyno pull is when you run the engine on a test machine that loads it like it’s driving. It helps you see how the engine performs and whether it stays healthy under stress.

Term

good rods

"Same rods on both. You need good rods at that power level. Yep."

Connecting rods are the parts that connect the pistons to the crankshaft. When an engine makes a lot of power, the rods have to be strong enough to survive the extra force.

Term

cylinder head

"And then the cylinder head, that's another fun thing for us. It's like, you can spend, we had, we had a whole podcast on how much money you can end up spending in cylinder heads, like crazy amount of money with the,"

The cylinder head is the top part of the engine where combustion happens. Changing or upgrading it can help the engine breathe better and make more power, but it can also get expensive.

Term

30 more CFM

"So you, you got 30 more CFM of intake flow. And all that really does is that lets the engine efficiently turn another about 500 RPM."

They’re saying the new head flows about 30 more units of air in testing. That extra breathing can help the engine keep making power at higher rpm.

Term

exhaust flow

"Exhaust flow is actually in the realm. Might even be slightly less on this one than the last one."

Exhaust flow is how easily the engine can push out burned gases. If the exhaust can’t keep up, the engine can’t breathe as well and power suffers.

Term

wet

"So a little over 4,400 pounds. So you did save some weight, but I mean, this is a wet, you could drive it on the street motor."

In this context, “wet” likely refers to a street-drivable setup (as opposed to a race-only configuration), meaning it can be driven on public roads. Drag builds often trade off between maximum performance and street usability—so “wet” here is about real-world drivability.

Term

belts

"how many belts were laying on the track after common rails were pulling... having a belt driven like higher PM sustained for 20 seconds, like you're going to throw a belt."

Belts are the rubber/serpentine drive straps that spin accessories. If the engine is turning fast and pulling hard, belts can slip or snap.

Term

transmission

"And everybody gets like, these guys have more money in their transmission than your"

The transmission is what sends power from the engine to the wheels using different gears. If the engine makes a lot of torque, the transmission usually needs stronger parts to handle it.

Term

cooling system

"Doesn't have cooling system. And I was like, man, thanks. Just go off to the pits. Super fun thing. Like, like everybody in your class..."

The cooling system is what keeps the engine from getting too hot. If it’s missing or not working, the engine can overheat fast, so the car can’t run safely for long.

Concept

heads

"Like we're getting all kinds of flow through way less expensive heads than we've had to in the past."

“Heads” are part of the engine that sit on top of the cylinders. They help control how air and fuel get in and how well the engine burns, so better heads can make the engine perform more.

Term

GT 55 style turbos

"...these Garrett, you know, all these GT 55 style turbos, the Gressor 98, there's a few, there's a few companies making them now."

This is a way of describing a certain size/type of turbo. Bigger/higher-flow turbo setups can make more power, but they usually change how the truck/engine feels and how quickly it spools.

Term

Gressor 98

"...GT 55 style turbos, the Gressor 98, there's a few, there's a few companies making them now."

This sounds like a specific turbo model name people use in diesel builds. Without the exact spelling/part number, it’s hard to say precisely what size or spec it is, but it’s clearly part of the turbo lineup being discussed.

Brand

Garrett's

"I mean, I've blown up Garrett's. I've won."

Garrett makes turbochargers that a lot of performance cars use. The point here is that even popular turbo brands can break when you run them at extreme racing settings.

Term

castings

"...it takes a while to get parts and development and the molding for like, for the castings and all that kind of tooling we got to get figured out."

Castings are metal parts made by pouring melted metal into a mold. The speaker is saying they need time and tooling to make those turbo components.

Term

compounds

"And when you have compounds, you don't just hurt one. You lose multiple turbos. Sometimes three. True."

“Compounds” means the engine uses more than one turbo. The goal is to get boost sooner and keep it strong, but it’s more complicated.

Concept

tree

"Even if Philip shows up, if you've run 499s, he's nervous when he's lined up next to you. He's like, I've got to be on the tree or this guy's."

The “tree” is the set of lights that starts the race. “Be on the tree” means you time your launch so you don’t jump the start and you get the best possible reaction.

Term

power windows

"And I'd have to get rid of my power windows, which power windows are awesome. Cause when it's Vegas and you're stuck in the lanes..."

Power windows are windows you move with a button instead of a hand crank. For racing builds people sometimes remove them to save weight, but they’re convenient in real life.

Term

bed

"I could get rid of the bed. That's probably 300 pounds."

The “bed” is the part of a pickup where you’d normally carry stuff. Taking it off can save a lot of weight.

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