does double clutch extend clutch's life?

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does double clutching extend clutch life.

yes
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10%
no
18
90%
 
Total votes : 20

does double clutch extend clutch's life?

Postby suprakid95 » Wed Jul 26, 2006 3:42 am

like the subject says does double clutching extend the life of the clutch? I had a debate with another member and just wasent seeing how it couldent be better for your clutch.

we both agreed it to save on syncros.
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Postby grip addict » Wed Jul 26, 2006 4:48 am

well, first let me say that double clutching is not worth the effort and time.
rev matching, however, is. when you double clutch, the only benefit as opposed to rev matching is that you're spinning the tranny input shaft. i personally find just rev matching to be more efficient. other people swear by it, though...

disclaimer aside-

whenever you downshift, you should always rev match. especially if you're at the car's traction limit around the corners...
not rematching during a downshift is actually called clutch braking

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Postby TheAutoholic » Wed Jul 26, 2006 4:59 am

The man speaks the truth.
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Postby theUNYTEDone » Wed Jul 26, 2006 9:22 am

i LOVE rev matching. learning it for the first time felt so awesome. still end up bogging sometimes, however...some ricers are like "wtf, why're you revving me out?!"

but when you just hear your car get louder and you dont FEEL any difference in the ride...not many things like it. :smokes:
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Postby MetalliKAT97 » Wed Jul 26, 2006 12:46 pm

Especially with any clutch beyond OEM your GOING to want to REV match reguarless because if you havent noticed the grip is a lot more intense. The only way to downshift without any major jerks to you or your passengers is rev matching.

With stock clutches you usually get away with it which is why ppl look at you funny when they hear you rev for no reason lol.

my car especially being a straight exhaust all the way back with any resinators or cats....LOUD AS HELL when you downshift from a high rev to begin with...but I Would rather do that than just drop it into a lower gear or any other method.


also helps if you heel-toe...im getting the hang of it. It really helps with highway traffic where you have the retards who all of a sudden slam their brakes and your going 80+ behind em...gatta use everything you've got. :P


probably way off topic but w.e :shrug:
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Postby jprine01 » Wed Jul 26, 2006 2:13 pm

Can somebody please explain the difference from double clutch to rev match?
When I downshift I stick it in N and mash the gas before I clutch again and put it into gear. This way the input shaft is spinning the right speed, and gives a smooth transition going into gear. This process matches the revs, and I clutch twice? Which one am I dong?? both??

If I do it right I'll over rev it a few hundred rpms so when I am letting the clutch back out on a downshift the car will actually start accelearting when the clutch grips, then i just hit the gas and boom super smooth downshift/acceleration. But I always called it double clutching, since every time I clutch twice.

And no, I think it only saves sycro ware not clutch.
Last edited by jprine01 on Wed Jul 26, 2006 2:20 pm, edited 1 time in total.
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Postby Simba » Wed Jul 26, 2006 2:19 pm

Rev match: Shifting directly to a lower gear, while blipping the throttle when the clutch is disengaged.

Double Clutch: Shift from a gear to neutral, engage clutch, blip, disengage clutch, shift to lower gear.

Double clutching doesn't do much for clutch life, but it does make synchros rather happy. It's more of a requirement with race boxes that run straight gears, than on any street car, but most people who do it do it as second nature and don't even think about it.

I double clutch everything but bikes and race cars with sequential boxes.

Lots of fast, loud things.
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Postby jprine01 » Wed Jul 26, 2006 2:30 pm

^^ AH Thanks.

Problem with my car is the syncros.
If I am say 3k rpm in 4th gear, and I want to downshift to 3rd so say 5k rpm?
When push the clutch in the input shaft on the trany is spnning 3k rpm and when I shift it into 3rd it has to suddenly speed up to 5k rpm via the sycros. My tranny = ERRR sounds.

Double clutching practicly elimiates all wear on the tranny. I can go from 2.5krpm 4th to 6k rpm in 2nd without the slightest grinding if I goto N and rev the input shaft up.

Its become natural on the alltrac, every downshift even when engine breaking basically. I got it down to like .25sec
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Postby 1BADGT4 » Thu Jul 27, 2006 2:57 am

What extends clutch life, is not using it as much as possible. That means shifting without the clutch ... much easier on a bike.
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Postby theUNYTEDone » Thu Jul 27, 2006 3:06 am

1BADGT4 wrote:What extends clutch life, is not using it as much as possible. That means shifting without the clutch ... much easier on a bike.


:lol:

dry shifting...to me, it's a ricer trick.
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Postby toayoztan » Thu Jul 27, 2006 5:47 am

Haha, dry shifting...similar to power shifting. Power shifting (to my knowledge) is holding down the gas, and slamming it to the next gear up..

In any case, rev matching is also good because not only are you jerking you and the passengers, but you're putting more "shock" to ball joints, cv joints, etc. Rev matching helps reduce the shock to these areas.

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Postby syko says » Thu Jul 27, 2006 8:21 am

i cant rev match, i try to, but i cant.. of course my tach doesnt work :( . but sooner or later i will gain that "i am one with my car" feeling and know how much its reving just by sound :smokes:
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Postby bloodMoney » Thu Jul 27, 2006 1:55 pm

Wait so lets go back to this whole powershifting thing for just a moment... Wont powershifting destroy a transmission? I had a friend who used to "powershift" in his viper and, don't get me wrong, it was fast as hell and the throwback from the acceleration was incredible... bu the also destroyed 2nd gear in just under 8,000 miles. Can someone clear this up for me?

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Postby 1BADGT4 » Thu Jul 27, 2006 3:27 pm

As toayoztan said - powershifting and what the others were calling my "dry-shifting" is the same.

There is a point in time where the tranny and the motor has a really light load ... during this time, you simply apply pressure on the shifter and BAM! The stick magically pops outta the gates and into "N."

If done right, without hearing the grind, it does NOT hurt your tranny.

syko - practice this before driving. Drive in gear (+2nd gear), clutch in, "blip" aka rev lightly, and clutch out (with _one_ lower gear). Done. My 165 hasn't been running in .. yrs, but I can remember the gear difference is about 500rpm? (Someone correct me if I'm wrong?)

BTW - How is this a ricer trick? I'm very sure old-school-muscle-car-guys have been using this technique since their era. If not, even older.
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Postby Simba » Thu Jul 27, 2006 8:02 pm

syko says wrote:i cant rev match, i try to, but i cant.. of course my tach doesnt work :(


Who needs a tach? You don't need to be exact. Just stab it higher than the input shaft speed for a given gear.

As for power shifting, it does involve the clutch, however one keeps the throttle at WOT. Fairly common in drag racing.

Dry shifting has nothing to do with power shifting, and is done without a clutch. Easy and relatively painless on sequential boxes, on upshifts only. On downshifts, or with a conventional box, dry shifting will destroy it quick.
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