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Old 02-18-2014, 05:00 AM   #1
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Double clutching

I understand the mechanics, I'm looking for personal opinions and thoughts, not out of the book jargon. is it good, bad, performance gains, less or more stress on the transmission, etc...?

I ask because I have been making a conscious effort to do it lately and wonder if my opinion matches up or I'm missing something.

Thanks in advance for your commentary.
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Old 02-18-2014, 06:48 AM   #2
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Your car has a synchronized transmission, there is no need to double clutch.

That said, it can help make smoother shifts but you will not be shifting faster as you will need to wait for engine rpm to rise (down shift or fall (up shift).

With smoother shifts also means less wear and tear as there will be less of a shock to the transmission/clutch.

If you are racing, unless you want to be slower, don't do it. Although, it does sound good. Watch the chase scene from the movie Bullitt. Steve McQueen does an excellent job double clutch his Mustang.
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Old 02-18-2014, 11:33 AM   #3
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I'm with Ish, the best time for double clutching is when there is no syncro and you don't want to grind gears. I got very good at it driving a 1929 Ford Model A (no syncro's at all) and a 1959 Edsel Ranger (3 on the tree, no syncro on first gear).
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Old 02-18-2014, 11:52 AM   #4
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I understand it isn't needed... I am just looking for personal opinions, not mechanical answers.
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Old 02-18-2014, 12:20 PM   #5
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Quote:
Originally Posted by The Puma View Post
I understand it isn't needed... I am just looking for personal opinions, not mechanical answers.
Well, as for personal opinion, I think it makes it more fun. It's almost like driving an old racecar.
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Old 02-18-2014, 02:48 PM   #6
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I see no need for it either. If I feel like being nice I'll just rev match instead of double clutching
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Old 02-18-2014, 03:56 PM   #7
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I see no need for it either. If I feel like being nice I'll just rev match instead of double clutching
Rev matching does feel a bit smoother, but double clutching gives that little bite upon disengagement of the clutch with that little added feel of power in the initial acceleration, no?





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Well, as for personal opinion, I think it makes it more fun. It's almost like driving an old racecar.
Agreed. Quite a bit more fun.
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Old 02-18-2014, 04:00 PM   #8
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Originally Posted by The Puma View Post
Rev matching does feel a bit smoother, but double clutching gives that little bite upon disengagement of the clutch with that little added feel of power in the initial acceleration, no?







Agreed. Quite a bit more fun.
I've never noticed a difference honestly
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Old 02-18-2014, 04:08 PM   #9
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I see no need for a car with properly functioning synchros.
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Old 02-18-2014, 08:32 PM   #10
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As someone who had to frequently double shift a truck, I greatly appreciate modern transmissions. It is nice to have the skill when needed, but I have never mastered any real speed doing it.
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Old 02-19-2014, 12:06 PM   #11
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Quote:
Originally Posted by The Puma View Post
I understand the mechanics, I'm looking for personal opinions and thoughts, not out of the book jargon. is it good, bad, performance gains, less or more stress on the transmission, etc...?

I ask because I have been making a conscious effort to do it lately and wonder if my opinion matches up or I'm missing something.

Thanks in advance for your commentary.
Double clutching is something that you had to do way back when (and nowadays in large trucks) because the synchros sucked or were nonexistant and just pressing the clutch once wouldn't allow you to shift into the next gear smoothly, so you would press the clutch, shift to neutral, let it out, and then press it again, and shift tot he next gear and the speeds of the input shaft and the idler gear would be more closely matched. To kind of sort of get a feel for why this makes it easier, you can try shifting without using your clutch. As long as your engine RPM and your speed are at the right ratio for the gear you are shifting to, you'll shift smoothly. If your speeds are too far off, even with synchros, you'll grind the gears

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Originally Posted by The Puma View Post
Rev matching does feel a bit smoother, but double clutching gives that little bite upon disengagement of the clutch with that little added feel of power in the initial acceleration, no?







Agreed. Quite a bit more fun.
Double clutching doesn't mean what you seem to be implying. To double clutch, you're just using the clutch to shift to neutral and then again to shift to the next gear. There is no "bite" because you're removing the difference between rotational speeds of the input shaft and the gear. It should feel as smooth as butter
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Old 02-19-2014, 12:20 PM   #12
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Quote:
Originally Posted by Shuvool View Post
Double clutching is something that you had to do way back when (and nowadays in large trucks) because the synchros sucked or were nonexistant and just pressing the clutch once wouldn't allow you to shift into the next gear smoothly, so you would press the clutch, shift to neutral, let it out, and then press it again, and shift tot he next gear and the speeds of the input shaft and the idler gear would be more closely matched. To kind of sort of get a feel for why this makes it easier, you can try shifting without using your clutch. As long as your engine RPM and your speed are at the right ratio for the gear you are shifting to, you'll shift smoothly. If your speeds are too far off, even with synchros, you'll grind the gears



Double clutching doesn't mean what you seem to be implying. To double clutch, you're just using the clutch to shift to neutral and then again to shift to the next gear. There is no "bite" because you're removing the difference between rotational speeds of the input shaft and the gear. It should feel as smooth as butter
Thanks again for the mechanical explanation even though it clearly says I understand what a double clutch is... As for the term bite, it was used to describe the transmission engaging the gear upon acceleration and feeling a better acceleration than a typical shift, nothing to do with smoothness of the shift. Thanks though.
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Old 02-19-2014, 05:39 PM   #13
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Ok, well you go on double clutching your shifts then, if it makes you happy.
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Old 02-20-2014, 01:05 AM   #14
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Lol. I wasn't trying to be rude, bro. My bad if I came off that way...

I'm just looking for opinions on here and keep getting info on synchros and that it isn't needed... Sorry again, I reread my message and didn't mean to sound so snotty.
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