Firing the Best Employee (And Getting Better Because of It)
The Diesel Podcast
Firing the Best Employee (And Getting Better Because of It) The Diesel Podcast · Jun 4, 2026
Firing the Best Employee (And Getting Better Because of It)

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Firing the Best Employee (And Getting Better Because of It)
Term

dynoed

“Dynoed” means they ran the engine on a special test machine. That machine measures how much power and torque the engine makes, so you can compare results.

Term

triple turbos

“Triple turbos” means there are three turbochargers on the engine. They help push more air into the engine for more power, but the setup is more complicated.

Term

wastegate full, full, full open

On a turbo engine, a wastegate is like a valve that helps control boost pressure. If it’s “full open,” it’s set to let exhaust bypass the turbo as much as possible, usually reducing boost.

Term

atmosphere chargers

This sounds like a description of the turbo system they expected to make boost. In this test, the wastegate setup meant those turbos weren’t going to work much, so the engine’s behavior was different than normal.

Term

2450

“2450” is the measured result from the dyno test—usually a power or torque number. It’s basically the engine’s output rating from that run.

Term

Hamilton CGI solid block

They’re talking about the engine’s cylinder block material. CGI (compacted graphite iron) is a stronger, tougher type of cast iron, and using a solid block helps the engine survive harder driving.

Term

crankcase breathers

Engines build up pressure inside the crankcase. “Breathers” are the vents that let that pressure and gases escape safely, and here they’re used as a hookup point for a vacuum to clear out hot air.

Term

vacuum cleaner

They’re using a vacuum to pull air out of the engine’s crankcase area while they check what’s happening. It’s a practical way to create suction so they can test and observe changes.

Term

restrictor, which is a precision flow valve

This is a valve that controls the amount of flow through a line. By turning it a specific amount, you can fine-tune how the system behaves during testing instead of guessing.

Term

running away

“Running away” means the engine starts revving out of control and won’t respond normally. It’s a dangerous situation because you can’t just back off the accelerator to stop it.

Term

boost

Boost is the extra pressure from the turbo that shoves more air into the engine. More boost can make more power, but too much can cause damage if the engine isn’t tuned for it.

Term

rail pressure

Rail pressure is how hard the diesel’s fuel system is pushing fuel through the high-pressure lines. If it drops during a big pull, the engine may not get the fuel it needs and things can go wrong.

Term

water injection

Water injection sprays water into the intake to cool the air charge. Cooler air can help the engine tolerate higher boost without overheating or detonating.

Term

compressor wheel

The compressor wheel is the turbo’s spinning part that squeezes air to make boost. Cooling it (or cooling the air around it) can help keep temperatures down when you’re pushing hard.

Concept

blow the thing up

“Blow the thing up” means the engine gets damaged badly, usually because the tune or boost is too aggressive. It’s the fear of pushing power beyond what the engine can safely handle.

Term

engine dyno

An engine dyno is a machine that tests an engine by itself. It measures how much power and torque the engine makes while you control the RPM and load.

Term

RPM sweep

An RPM sweep is how the dyno test moves the engine through different RPMs. How quickly it ramps up can change what the engine does and what the dyno records.

Concept

slow down the acceleration rate

Acceleration rate is how fast the dyno pull ramps up. If it ramps too quickly, the engine doesn’t have time to behave normally, so the results can be misleading.

Person

Joss McCormick

Joss McCormick is mentioned as a top expert at using a chassis dyno. The point is that dyno testing is a skill, not just a machine you turn on.

Term

dyno time

Dyno time is time on a machine that measures how much power an engine makes. It’s used to test and compare builds in a controlled way.

Term

nitrous bottle

A nitrous bottle is a tank of nitrous oxide that you inject to make more power. It’s like a temporary boost that can help you hit a higher number on a dyno or at the track.

Term

motor scatters

“Motor scatters” means the engine fails badly, with parts breaking or coming apart. It’s the worst-case outcome when you push a build too hard.

Brand

Columbus diesel 5250

Columbus Diesel 5250 is the turbo setup the engine started with. The host is comparing it to a different turbo to show how the power and tune changed.

Term

14 millimeter pumps

These are fuel pumps sized to move a certain amount of diesel. Bigger/more capable pumps can supply more fuel for higher power, but they also make it easier to over-stress the engine if everything isn’t tuned correctly.

Brand

Hart's 5.1

Hart’s 5.1 is a particular turbo setup used on the diesel. The host says it made similar power and changed how the engine burned fuel.

Term

leaner and hotter

“Lean” means there’s relatively less fuel compared to the air/oxygen. “Hotter” means the engine runs hotter during combustion, which can be harder on parts.

Term

triple front pump cover

It’s a custom part that changes how the engine’s fuel pump is set up. The goal is to let the engine feed more fuel so it can make more power—if the engine is built to survive it.

Term

Hart's 3.6

“Hart’s 3.6” sounds like a specific turbo setup the builder uses. Bigger turbo hardware helps the engine move more air, which is what allows huge horsepower numbers.

Term

88 millimeters

That “88 millimeters” is a measurement of the turbo hardware. A larger size usually means the turbo can push more air into the engine, which helps it make more power.

Term

turbo game

This is basically “how well the turbo setup is working.” The host means the turbo choice and tuning are what let the engine make huge power.

Term

4.8

“4.8” is used as a shorthand for a larger turbo/boost hardware configuration than the earlier “3.6.” The host then reports a big power increase after swapping to this “4.8,” implying it’s a turbo size step-up.

Term

rev limiter

A rev limiter is a safety/engine-control limit that stops the engine from spinning past a certain RPM. The host is saying this build was hitting that limit hard.

Term

gate it off

It sounds like they’re limiting the engine’s airflow or power delivery after a certain point. That can help keep things under control or prevent damage while still making big power.

Term

3,000 horsepower

Horsepower is a way to measure how much power the engine can produce. “3,000 horsepower” means the engine is making an extremely large amount of power.

Term

4.1

“4.1” is the engine size—about 4.1 liters. A bigger displacement engine can generally move more air, which helps it make more power, especially with a turbo.

Term

stainless turbos

This means the turbocharger is made with stainless steel parts. Stainless can handle heat better, which helps when you’re pushing the engine very hard.

Term

285 millimeter

That “285 millimeter” number is a size measurement related to the turbocharger. Bigger turbo sizes can move more air, which helps the engine make more power.

Term

3,000 foot pounds

Foot-pounds is how you measure torque, which is the twisting force the engine produces. More torque usually means stronger pull when you accelerate.

Term

torque and horsepower across at 5250

They’re saying the engine makes strong power around 5,250 RPM. If power is strong across a range of RPMs, it tends to feel quicker and more usable.

Term

oil filler cap

The oil filler cap is where you add engine oil. If you take it off while the engine is running, you can sometimes tell whether the engine is venting too much pressure or vapor from inside the crankcase.

Term

crankcase vapor

Crankcase vapor is gas that should stay inside the engine’s bottom end. If you see a lot of it, it can mean the engine isn’t sealing well and combustion gases are getting past the piston rings.

Term

motor is really tight

“Tight” usually means the engine is sealing well inside. Less leakage past the pistons can mean fewer crankcase gases and a healthier-running engine.

Dodge Charger
Car

Dodge Charger

The Dodge Charger is a car built for performance, meaning it’s designed to be fast and fun to drive. People often change parts to make more power, including parts that help control engine boost. That’s why it can show up in a conversation about tuning and getting boost control right.

Term

wide open throttle

Wide open throttle means the accelerator is fully pressed. It forces the engine to work at its hardest, which is why people use it to test how the car performs under maximum load.

Term

common rail injectors

Common rail injectors are how a diesel sprays fuel into the engine. They use a high-pressure fuel system to deliver fuel more precisely, which helps the engine make power reliably.

Term

super stock

Super Stock is a racing class with specific rules about what the car can be modified to. The goal is to be fast, but also consistent enough to finish and compete reliably within those rules.

Term

three pumps

“Three pumps” means the engine is using multiple fuel pumps to move and pressurize fuel. The idea is to make sure there’s enough fuel available when the engine is working hard.

Term

rate trace

A rate trace is a graph that shows how an injector sprays fuel over time. It helps you tell exactly when the injector starts and stops, not just the total amount of fuel.

Term

ball comes off the seat

Inside many injectors there’s a valve that seals shut and then opens to let fuel through. When the valve lifts off its seal, spraying starts; when it closes again, spraying stops.

Term

top dead center

Top dead center is the point where the piston is at its highest position in the cylinder. It matters because the engine’s compression happens around this part of the cycle.

Term

dwell time

Dwell time is the “hold” period before the injector’s effective spray timing. If that timing is wrong, the engine doesn’t get the fuel when it needs it, so power drops.

Term

rate of injection

Diesel engines spray fuel into the cylinder. The injection rate is how fast that fuel gets sprayed, and it strongly affects how well the engine burns the fuel and how much power it makes.

Term

injection off time

Fuel injection has a start and a stop. Injection off time is when the engine tells the injector to stop spraying fuel, which changes how the engine burns and how hot it gets.

Term

exhaust gas temperatures

EGTs are how hot the engine’s exhaust gets. If they get too high, it can damage parts and it usually means the engine isn’t burning efficiently.

Term

timing

Timing is about when the engine injects fuel during the cycle. If it’s too early or too late, the engine can make less power and run hotter.

Term

cylinder pressure

Cylinder pressure is how much force is created inside the engine when fuel burns. Higher or poorly controlled pressure can mean the engine is working too hard or burning inefficiently.

Term

ECM

The ECM is the engine’s computer. It decides things like how much fuel to inject and when, based on sensor inputs.

Term

two wheel drive

Two-wheel drive means the truck only powers one set of wheels. With big power, that can make it easier to lose traction compared to driving all four wheels.

Term

Cummins common rail

“Common rail” is a modern way of feeding fuel to a diesel engine. It keeps fuel at high pressure in a shared “rail,” so the engine can inject it more precisely—often making it easier to tune for power or records.

Term

chassis dyno

A chassis dyno is a test setup where the car sits on rollers and the wheels are loaded. It helps measure how much power the car actually makes to the wheels while it’s under resistance.

Term

exhaust valves

Exhaust valves are the engine’s “exit doors” for burned gases. If you’re pushing boost hard, the exhaust side has to work well too, so the engine can breathe and stay stable.

Term

injector on time off time

This is about exactly when the fuel injector turns on and off. The timing controls how much fuel gets injected and how well it burns, which matters a lot when the engine is heavily boosted.

Term

methanol

Methanol is a different fuel than gasoline or diesel. In performance setups it can be added to change how the engine burns, but the host is saying they’re not using it for this record.

Term

dynamite diesel injectors

Fuel injectors are the parts that spray fuel into the engine so it can burn. In a diesel, they’re especially important for power and smooth running, and the host is talking about a specific injector brand that racers use.

Term

fuel injectors

Fuel injectors decide how much fuel the engine gets and how well it sprays. Better injector setups can help a diesel make more power and burn fuel more cleanly.

Topic

Fast 72

Fast 72 is described as a drag-racing event format where competitors get a limited number of “hits” (runs) and then the schedule shifts to additional track time. The host is using it to explain how tight the weekend becomes when it’s split with another event.

Topic

UCC

UCC is the name of a racing event in the diesel-truck world. The host is saying it’s sharing a weekend with another event, which makes the schedule tighter for racers.

Term

two hits

A “hit” here means one race run down the track. If you only get two, you have less time to fix problems, so the truck has to be dialed in quickly.

Concept

drag race truck

A drag race truck is a truck built to go fast in a straight line for short races. The goal is quick acceleration, often with changes that help it hook up and launch.

Concept

truck pull guys

Truck pulling is a competition where a truck drags a heavy sled and tries to go as far as possible. The people who are “truck pull guys” focus on making the truck put power to the ground and keep pulling.

Concept

dyno guys

“Dyno guys” are people who use a dyno, which is a machine that measures how much power and torque a vehicle makes. It’s a way to test and tune cars or trucks more precisely than just driving them.

Ford Excursion
Car

Ford Excursion

The Ford Excursion is a big SUV built like a truck. It’s the kind of vehicle that can handle towing and long trips, and the host is saying they used one to bring their kids to events.

Term

90 horsepower nozzles

Diesel engines use fuel injectors to spray fuel into the engine. “Nozzles” are the injector tips, and “90 horsepower nozzles” is a tuning term meaning a nozzle upgrade that’s marketed to make more power.

Term

diesel injector products

A diesel injector is a part that sprays fuel into the engine. The “products” part means they sell injector replacements or upgrades for diesel engines.

Concept

behind the scenes

They’re talking about showing what’s really going on inside the business—how the product is handled and supported. For shops and dealers, that builds trust that problems will be handled quickly.

Term

code

A “code” is an error message the car’s computer saves when it finds a problem. If the code keeps coming back, it usually means the fix didn’t fully solve the issue.

Company

DFC diesel

DFC Diesel is the company sponsoring this episode. They’re presented as a source for rebuilt diesel engines and technical help.

Term

remanufactured engines

Remanufactured engines are rebuilt using a mix of reused and replaced components to restore the engine to a specified standard. Compared with a used engine, remanufacturing typically includes controlled machining, part replacement, and testing to reduce the chance of repeating the original failure.

Brand

Powerstroke

Powerstroke is Ford’s diesel engine line for trucks. A remanufactured Powerstroke means that Ford diesel engine has been rebuilt and tested for reuse.

Brand

Duramax

Duramax is GM’s diesel engine line for trucks. If you’re looking at a remanufactured Duramax, you’re talking about rebuilding that specific GM diesel engine.

Term

ISO 9001 2015

ISO 9001 is a quality standard that companies follow to make sure their processes are consistent. If an engine shop is ISO 9001 certified, it generally means they have structured procedures to build and test engines the same way every time.

Concept

quality testing validation

They’re talking about testing and proof that the rebuilt engine meets the right standards. The goal is to make sure it works correctly and doesn’t fail again soon.

Term

warranty

A warranty is the promise that if something goes wrong, the company will cover repairs or replacement. Here, they’re saying the reman engine comes with strong coverage, so you’re not stuck paying for another failure.

Term

OEM engine

An OEM engine is the same type of engine the truck originally came with from the factory. The host is saying sometimes people want something beyond the basic factory-spec engine, especially if their truck is modified or used heavily.

Term

speed of air series

They’re talking about a specific engine setup/line called “speed of air.” The idea is that it helps the engine move air more efficiently, which can help it make power and run better.

Brand

speed of air pistons

They mention “speed of air pistons,” which are a particular brand/style of piston used inside the engine. Pistons are the parts that move up and down to compress the fuel-air mix and make power.

Term

lack of lubricity

Lubricity is how well diesel fuel can “lubricate” the moving parts inside the fuel system. If the fuel doesn’t lubricate enough, those parts wear out faster and can cause costly breakdowns.

Brand

hotshot secrets

Hot Shot’s Secrets is a brand that makes diesel fuel additives. They’re saying their product helps diesel fuel lubricate better so the fuel system parts don’t wear out as quickly.

Term

fuel systems

Your fuel system is everything that gets fuel from the tank to the engine. If it’s not working right, the engine can run poorly and can even damage other parts.

Term

EO number

An EO number is basically a code that identifies the exact version/spec of an injector. It helps make sure you’re working with the right matching part.

Brand

Siemens

Siemens is the company that originally made these injectors. Different injector designs from different makers can fail in different ways and may be easier or harder to rebuild.

Term

delaminates

Delaminates means the surface layers start peeling apart. On an injector, that can ruin the seal and make the injector spray and leak incorrectly.

Term

regrind

Regrinding means grinding the damaged surface back to the right shape. The idea is to restore a good seal so the injector can work properly again.

Term

case hardened

Case hardening is a way to make the outside layer of a metal part super hard, while the inside stays tougher. The problem described here is that the hard outer layer can start peeling/flaking off, which makes the part wear out quickly.

Term

rock well

Rockwell is a lab test that measures how hard a metal is. The host is saying the part needs to be very hard (around 55–57 on the Rockwell scale), but after the hard layer flakes off it drops to something much softer (about 18–25), so it wears out.

Term

needle valve

A needle valve is the tiny moving valve inside a diesel injector that controls when fuel is allowed to spray. If the metal surfaces aren’t hard enough, the needle can hammer and wear them down over time.

Term

injector nozzle

The injector nozzle is the part at the end of the diesel injector that sprays fuel into the engine. If it gets worn or damaged, the injector can’t spray correctly, and rebuilds may fail sooner than expected.

Term

six liter injectors

“Six liter injectors” means injector parts meant for a diesel engine with about a 6.0-liter size. The host is saying they make nozzle parts that other shops can install into those injectors.

Term

stock flow

“Stock flow” means the fuel injector delivers the same amount of fuel as the original factory setup. The host is saying they can get the required approvals/testing if the replacement parts behave exactly like the originals.

Term

carb testing

CARB testing is emissions testing required for parts sold in California. The host is saying they can go through that process if their replacement parts match the original fuel delivery closely enough.

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