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You’d better either double clutch or float those gears, because if you don’t, you’re destroying your clutch brake, which means you’ll have trouble getting it into gear from a dead stop. That applies for both upshifts and downshifts.
Ever sit next to an old truck or bus and hear them grinding gears to get into gear?
That’s due to the clutch brake failing to stop the flywheel.
All semi trucks in the US use synchro-less manual transmissions.
When shifting a syncro-less transmission, YOU are the synchro.
The clutch in these trucks has 2 positions. You either just barely engage the clutch enough to break contact, or you depress it fully to engage the clutch brake and (attempt to) stop the flywheel from spinning.
If you do the second one while shifting a moving vehicle, you’re causing undue wear and tear on the aforementioned clutch brake.
I can’t speak for big rigs, but I drive and ride multiple manuals. Synchro or not, there’s no reason to double clutch an upshift in the cars under normal or high performance situations. It’d only make sense if I took too long to shift and had the engine rpm fall far below what matches the speed of the next gear. It’s a drag race. They’re burning synchros to drop 6krpm to 4k in the next gear in half a second. Even in normal driving, dropping 1000rpm or more is plenty of time to catch the next gear. 2 of my mini trucks have burnt synchros on one gear each (prior to my ownership), so I’m pretty well aware of how to time it for a smoother shift on the downfall. If double clutching was necessary on upshifts, I wouldn’t be able to do gasless clutchless shifting. But I can
Downshifts, absolutely. There’s plenty of reason to double clutch a downshift. The engine is, by definition, under spun for the next gear so yes, blipping it up will make it easier to drop a gear. Not needed for 1 gear at a time with good synchros, but certainly adds consistency when I do a 5>3 downshift to pass in the truck with a burnt 3rd. Almost required when I had braking problems and needed to downshift into 1st since the speed differential was far greater.
The source of the line form the movie is probably from the theatrical soundtrack from Bullitt. The engine sound was recorded separately from a GT40. The driver double clutched because it sounded mean.
Let’s not forget the line comes from a scene in which granny shifting burnt the piston rings, dangered the manifold, made the floorboard fall off, and spilled a jar of o-rings.
I assume you used the wrong word towards the end. The flywheel is bolted to the crankshaft. If anything stops the flywheel, the engine is now turned off.
Sure. But in the first Fast and Furious movie they’re not driving syncro-less transmission semis. They’re driving tricked out sports cars in a straight line and somehow having about 14 gear changes in a 6 speed manual.
Donut Media has excellent videos about the worst and best lines. Some are dual category because they’re so bad they’re ironically integral to the community now
You don’t double clutch on upshifts either (it was a drag race) so I’d say the parody is accurate
Uh.
I drove semi trucks in the US for years…
You’d better either double clutch or float those gears, because if you don’t, you’re destroying your clutch brake, which means you’ll have trouble getting it into gear from a dead stop. That applies for both upshifts and downshifts.
Ever sit next to an old truck or bus and hear them grinding gears to get into gear?
That’s due to the clutch brake failing to stop the flywheel.
All semi trucks in the US use synchro-less manual transmissions.
When shifting a syncro-less transmission, YOU are the synchro.
The clutch in these trucks has 2 positions. You either just barely engage the clutch enough to break contact, or you depress it fully to engage the clutch brake and (attempt to) stop the flywheel from spinning.
If you do the second one while shifting a moving vehicle, you’re causing undue wear and tear on the aforementioned clutch brake.
I can’t speak for big rigs, but I drive and ride multiple manuals. Synchro or not, there’s no reason to double clutch an upshift in the cars under normal or high performance situations. It’d only make sense if I took too long to shift and had the engine rpm fall far below what matches the speed of the next gear. It’s a drag race. They’re burning synchros to drop 6krpm to 4k in the next gear in half a second. Even in normal driving, dropping 1000rpm or more is plenty of time to catch the next gear. 2 of my mini trucks have burnt synchros on one gear each (prior to my ownership), so I’m pretty well aware of how to time it for a smoother shift on the downfall. If double clutching was necessary on upshifts, I wouldn’t be able to do gasless clutchless shifting. But I can
Downshifts, absolutely. There’s plenty of reason to double clutch a downshift. The engine is, by definition, under spun for the next gear so yes, blipping it up will make it easier to drop a gear. Not needed for 1 gear at a time with good synchros, but certainly adds consistency when I do a 5>3 downshift to pass in the truck with a burnt 3rd. Almost required when I had braking problems and needed to downshift into 1st since the speed differential was far greater.
The source of the line form the movie is probably from the theatrical soundtrack from Bullitt. The engine sound was recorded separately from a GT40. The driver double clutched because it sounded mean.
Let’s not forget the line comes from a scene in which granny shifting burnt the piston rings, dangered the manifold, made the floorboard fall off, and spilled a jar of o-rings.
I assume you used the wrong word towards the end. The flywheel is bolted to the crankshaft. If anything stops the flywheel, the engine is now turned off.
Sure. But in the first Fast and Furious movie they’re not driving syncro-less transmission semis. They’re driving tricked out sports cars in a straight line and somehow having about 14 gear changes in a 6 speed manual.
While true, there are syncro-less racing transmissions as well for a number of the more popular moddable cars.
Well I did say I was being pedantic, which is absolutely the best way to watch fast and furious with friends
Friends? Sib, you watch FnF with family
Donut Media has excellent videos about the worst and best lines. Some are dual category because they’re so bad they’re ironically integral to the community now