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Are Clutchless Manual Gearboxes Better Than You Think? — Carmudgeon w/ Cammisa & DTS — Ep 232

Are Clutchless Manual Gearboxes Better Than You Think? — Carmudgeon w/ Cammisa & DTS — Ep 232

The Carmudgeon Show Apr 06, 2026 61 min
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About this episode

The Carmudgeon Show dives into the long, weird history of “clutchless” manual solutions—starting with pre-war preselectors like Wilson and Kotal, then jumping to post-war oddballs such as Citroen’s Citromatic and Mercedes Hydrak, and later to Ferrari’s F1-style single-clutch automation and Valéo’s automated manuals. The hosts compare how these systems tried to solve non-synchro and clutch-footwork problems, why many failed (tuning, dry vs wet clutches, learning/logic), and how today’s dual-clutch automatics finally got close to seamless. Along the way, they debate what “automatic” really means and share horror stories from F1/SMG/SMT experiences.

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Technical Too Afraid to Ask
Company

Haggerty

"Yeah, all of which are insured by Haggerty. This is the Carmageddon show. They're real. But they're not insured. Or you think they're insured? ... Okay, so this is all this nonsense is driven by Haggerty. No, no, no, it's not. The podcast is driven by Haggerty."

Hagerty is an insurance company that’s known for covering classic and hobby cars. They’re basically the “collector car” insurance brand, which is why the hosts joke about insuring even weird things.

Term

carbon monoxide

"It's got four webers, and there's a lot of carbon monoxide, and I think we all may be on the verge of death. Carbon monoxide gauge over there, say."

Carbon monoxide (CO) is a toxic exhaust gas that can build up if the engine isn’t tuned correctly or if the car is run in an enclosed area. The mention of a “carbon monoxide gauge” suggests they’re actively monitoring dangerous levels, which is a serious safety concern.

Term

surface corrosion

"when I bought it from you, which was a bit of surface corrosion in the back."

Surface corrosion is basically rust that starts on the outside of the metal. It might look small, but if it keeps getting moisture, it can spread.

Term

rust bubbles

"because some of the rust bubbles for those not watching, these little rust bubbles by the right rear quarter of the car behind the wheel opening."

Rust bubbles are little bumps under the paint caused by rust forming underneath. They’re a warning sign that the metal is starting to corrode.

Term

touch-up paint

"I went and touched up, and I think we used about 71 gallons of touch-up paint on this car, touched up everything, including all those rust spots."

Touch-up paint is small-area paint used to cover damage or spots. It can help protect the metal, but if rust is still there underneath, it may come back.

Car

Dodge Dart

"I got sort of pit maneuvered by a Dodge Dart. [505.9s] And I bought the last remaining new old stock bumper in the world rather than trying to fix mine."

They’re saying a Dodge Dart was the other car that hit them. The takeaway is that accidents can be rough enough to require serious body repair.

Term

chemically strip the bumper

"Well, they had to then chemically strip the bumper down to bear plastic again. And it was just, it was a month of frustration or two months of frustration"

They used chemicals to remove the paint completely. Then they could repaint it so the original bumper texture shows through instead of being filled in by thick paint.

Concept

CO poisoning

"They had the car running so they had CO poisoning just like Jason does. What? Um, yeah."

CO poisoning refers to carbon monoxide poisoning, which can happen when an engine or exhaust system produces CO in an enclosed or poorly ventilated space. The speaker is using it as a cautionary anecdote about running the car in a way that could expose people to dangerous exhaust gases. It’s not a car “feature,” but it’s a real safety risk tied to how vehicles are started and tested.

Concept

Pebble Beach restorations

"He comes from a shop where they do Pebble Beach restorations of cars. Right."

Pebble Beach is a famous car show where cars are judged like art. A “Pebble Beach restoration” means the work is aimed at making the car look perfect, not just good enough to drive.

Term

paint code

"There is no like, you pull up a paint code and this comes up, you pull up a paint code and it's something approaching this color. But every one of them is different and they're all completely different."

A paint code is like a recipe number for the exact color the car left the factory with. The point here is that this car’s paint history is messy enough that the “recipe” doesn’t match what’s on the panels.

Car

Volkswagen Egolf

"In fact, I'm thinking about buying one of those badges and putting it on something, maybe even the Ferrari automatic stick shift. You could put it on your e-golf. Right next to the manual gearbox preservation society license plate frame that pisses everyone off."

The Volkswagen e-Golf is a Golf that runs on electricity instead of gasoline. It’s meant to be a normal, practical car, just powered by a battery. The episode brings it up because the name and badge are easy to recognize.

Term

clutch

"Basically, it disengages the clutch, allows you to shift and then re-engages the clutch. And it has two pedals."

A clutch is what lets you separate the engine from the gearbox. When you press it, you can change gears without grinding them.

Concept

Sport-O-Matic

"So automatic stick shift and Sport-O-Matic are the same thing. So Sport-O-Matic was available starting in the late 60s... And then like you said, there's a micro switch... it just engages, it puts the clutch in... And it disengages your clutch."

Sport-O-Matic is a type of “semi-automatic” gearbox. You can move the shifter like a manual, but the car controls the clutch for you.

Term

over rev

"You can, but you're not going anywhere. And you will maybe over rev. And then you move the lever and then it does everything for you."

Over-rev means the engine is being pushed to too high an RPM. If it happens during a bad shift, it can be rough on the engine.

Concept

column shifted four-speed manual transmission

"In low trim cars, you've got a conventional four-speed manual transmission, albeit column shifted."

Instead of the shifter being on the floor or center console, it’s on the steering column. In these versions, it’s a four-speed manual.

Car

DS

"...because it was expensive for a car of that category when the DS came out, especially for post-war France..."

The Citroën DS was a famous Citroën from the post-war era. The speaker is using it as a reference point for how expensive the car was when it first came out.

Concept

decontent the car

"So they tried to decontent the car and make it a conventional manual to save money."

“Decontenting” means taking out features to make the car cheaper to build. The idea is to lower the price so more people can afford it.

Company

SMG

"And the SMG. SMG, yeah, correct."

SMG is BMW’s automated manual transmission. It lets you shift without using a traditional clutch pedal because the system controls the clutch for you.

Company

Bosch

"If you look closely at, like, they make all kinds of little bits and bobs in the same way that LEM, Ford or Bosch or..."

Bosch is a major automotive supplier known for electronics and systems (and historically many mechanical and electromechanical components). Mentioning Bosch in the same breath as Valéo and other suppliers emphasizes that many “car technologies” come from specialized component companies, not just the automaker itself.

Company

ZF transmission

"So they work with the car companies to develop technologies that they then sell to the car in the same way that ZF transmission would be."

ZF is a well-known transmission and driveline supplier that develops gearboxes for many automakers. The speaker uses “ZF transmission” as an analogy for how Valéo works with car companies to develop and supply driveline technologies.

Term

paddle

"Yes, or it's like watching someone drive an F1, but instead of pulling a paddle, they're moving a lever in the gate to the next gear."

A paddle is a small lever behind the steering wheel that you pull to shift. They’re saying this system uses a normal-looking gear lever instead of paddles.

Term

blip the revs

"It would blip the revs and then just a little bit and then engage gradually and go."

A “rev blip” is a quick moment where the engine speed jumps up. It helps the car shift or launch more smoothly instead of feeling rough.

Term

RPM

"There'd be a feedback loop where it monitors RPM and decides what to do accordingly."

RPM tells you how fast the engine is spinning. The transmission computer uses RPM to help decide the right moment to shift.

Term

QP5

"you're creating a massive amount of heat and wear, which is what happened in the QP5 with Garrett back in the day. And all I did was car had like 31 miles on it and I just backed into a parking space in San Francisco and"

QP5 sounds like a specific test or early program name. In this story, it’s used to point to a real example where the clutch got damaged quickly because of how the car was behaving at low speed.

Term

automatic transmissions

"When you're dealing with automatic transmissions in the US and people who are buying an automatic, they don't expect compromises."

An automatic transmission changes gears by itself. You don’t have to push a clutch pedal or shift manually, and most drivers expect it to feel smooth and effortless.

Brand

BMW

"And I looked up a car that I think, so everyone sort of knows BMW unleashed SMG on the unsuspecting public because it wasn't just in the M cars."

BMW is the brand being discussed. The speaker is talking about BMW’s SMG transmission and why it didn’t always match what drivers expected from an automatic-like experience.

Concept

rev flare

"And LFA? [2822.0s] LFA had a bit too much rev flare. [2827.4s] And you're like, oh, no, the clutch."

Rev flare is when the engine revs jump up during a shift. If it’s too strong, it can make the car feel jerky or like the clutch isn’t engaging smoothly.

Brand

Mercedes-Benz

"Which is weird because Mercedes-Benz was, I guess, not so much then using Automatics widely, but Mercedes relatively early was like all in on Automatics."

They’re talking about Mercedes-Benz and how the company chose a particular style of automatic transmission. The point is that Mercedes did things a little differently than other brands.

Brand

Honda

"is it relevant to you that Honda uses planetaries ... but Honda uses high-point gears."

Honda is the car brand being used as an example here. They’re described as using a different kind of gear setup inside their transmissions.

Term

H pattern shifter

"That would be finally a world in which you can have an H pattern shifter and then just hit D and drive it in automatic and traffic and never worry about anything."

That’s the familiar gear-shift pattern you see in many manuals, where you move the shifter into different positions for each gear. People like it because it feels more direct and mechanical.

Term

synchromesh

"You know, if you go to pre-war, it was the act of the gear change and the lack of synchromesh. That was kind of the thing that you were working around."

Synchromesh is the mechanism in a manual transmission that matches the speed of the gears before they engage. That makes shifting smoother and prevents grinding, especially when the engine and transmission input speeds differ.

Concept

0-60 time

"And the reality is, 0-1X, for example, like you couldn't have a car that does 0-60 as quick as any of these cars do because the shift alone would ruin any chances."

This is a simple test: how fast a car goes from stopped to 60 mph. If the car has to shift gears slowly, it can lose time and make the number worse.

Concept

fuel efficiency

"and it's all for fuel efficiency. So yeah. What an uplifting place to end. Fuel efficiency."

Fuel efficiency is how far a car can go per unit of fuel, driven by factors like engine load, shift strategy, and drivetrain losses. In the context of transmissions, modern control systems try to keep the engine operating in more efficient ranges and reduce unnecessary power interruptions.

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