Standard / Manual Transmission Drivers - double clutch
#16
Rennlist Member
I can’t see the value of double clutching a passenger car, rev match yes. Big transmissions have square cut gears and double declutching on downshifts is important and mostly necessary. But upshifts can be done very fast with just a quick release of the accelerator and no clutching at all.
#17
I don't use the clutch when talking it out of gear during slowdown. There is a way to do this without causing any wear to any of the parts. Have been doing this for 15 years but not because I want to save the transmission but to save the release bearing. I use the brakes to slow the car while the transmission is in neutral, not the clutch. Rev matching during declaration makes the clutch do the job of the brake pad. Much easier to replace the pads so let them do that work.
#18
Captain Obvious
Super User
Super User
There still going to be strain on the clutch disk that's absolutely not necessary. Also, why even bother when you have brakes to do the same thing that doesn't require much effort? You are not on the race track, why drive like you are on one? #honingyourskills ?
Last edited by Imo000; 12-01-2021 at 09:48 AM.
#19
If you don't, you're simply doing it wrong.
#20
Three Wheelin'
Rev matching downshifts isn't just about going fast. It's just the proper way to downshift. If you're in 5th gear and slow down for someone making a turn in front of you... do you just stay in 5th? You can use your brakes to slow down... that's fine. Engine braking is a different debate. But you ARE gonna downshift aren't you?? When you downshift to pass someone on the highway, you rev match. When you downshift when slowing down on the street, you rev match. It's just what you do. My daily is a manual Jeep Wrangler. I rev match.
If you don't, you're simply doing it wrong.
If you don't, you're simply doing it wrong.
#22
Three Wheelin'
some years ago, my then new honda civic was not shifting smoothly. I complained to the SA who suggested I take him for a drive. Your problem is you are granny shifting and not exercising the synchos he said. You do this by pushing the lever against the gear gently, but not completing the shift. I did this (and still do it) and it solved the problem
Last edited by reacp911; 12-01-2021 at 10:48 AM.
#23
Drifting
I used to have to double clutch on some old trucks, and sometimes when the gear oil was not up to temp.
Me? I heal/toe/blip throttle. What I was tought, was transmissions, were for accelerating, brakes were used do decelerating.
Down shifting was preparing for the next gear and accelerating again.
Downshifting in a high compression diesel, the transmission will slow you down. A car @9:1 compression, has little effect, other than impressing the ladies, or passenger.
But I’m a legend in my own mind. I have large following already 🙂
Brakes are cheaper than transmissions. Miss a downshift, that’s a money shift. $$$$$$$ 11k rpm, bend something, or log a over rev.
fuel cut off, work great on acceleration. 5th to 2nd, 💥
Double clutch. Never for me.
Me? I heal/toe/blip throttle. What I was tought, was transmissions, were for accelerating, brakes were used do decelerating.
Down shifting was preparing for the next gear and accelerating again.
Downshifting in a high compression diesel, the transmission will slow you down. A car @9:1 compression, has little effect, other than impressing the ladies, or passenger.
But I’m a legend in my own mind. I have large following already 🙂
Brakes are cheaper than transmissions. Miss a downshift, that’s a money shift. $$$$$$$ 11k rpm, bend something, or log a over rev.
fuel cut off, work great on acceleration. 5th to 2nd, 💥
Double clutch. Never for me.
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997turbocab (12-02-2021)
#24
Captain Obvious
Super User
Super User
Rev matching downshifts isn't just about going fast. It's just the proper way to downshift. If you're in 5th gear and slow down for someone making a turn in front of you... do you just stay in 5th? You can use your brakes to slow down... that's fine. Engine braking is a different debate. But you ARE gonna downshift aren't you?? When you downshift to pass someone on the highway, you rev match. When you downshift when slowing down on the street, you rev match. It's just what you do. My daily is a manual Jeep Wrangler. I rev match.
If you don't, you're simply doing it wrong.
If you don't, you're simply doing it wrong.
#25
Captain Obvious
Super User
Super User
#26
When I'm slowing down from 5th I just put it in neutral without using the clutch and use the brakes. Don't downshift and use the engine to brake what so ever. I do all my own repairs and know what this does to the clutch so last thing I want is to create more work for myself. As for the highway, on the rare occasion I need to downshift to pass something, I just downshift like everyone else, no rev matching.
What if you need to suddenly accelerate again??
I mean... you're right in that you're DEFINITELY not wearing the clutch... but engine braking doesn't wear the clutch either... nor does downshifting with proper rev matching.
#27
Three Wheelin'
Another anecdote. I was coming back from a date in Hamilton in my '59 beetle. I approached a light, put in the clutch and bang. A pressure plate spring broke. Clutch would no longer release. What to do? Being an engineering student, I put it into gear. Cranked the starter. The car rolled forward and chugged to life. From then on, it was clutchless shifting. Had to repeat at a few lights.
Knowing a few techniques never hurts.
Knowing a few techniques never hurts.
#28
Another anecdote. I was coming back from a date in Hamilton in my '59 beetle. I approached a light, put in the clutch and bang. A pressure plate spring broke. Clutch would no longer release. What to do? Being an engineering student, I put it into gear. Cranked the starter. The car rolled forward and chugged to life. From then on, it was clutchless shifting. Had to repeat at a few lights.
Knowing a few techniques never hurts.
Knowing a few techniques never hurts.
#29
Captain Obvious
Super User
Super User
Then I put it in gear and off I go but that scenario would be very rare. You are DEFINATELY wearing the clutch under engine load even if you are decelerating. The load on the friction surfaces of the disk and on the disk/dual mass flywheel springs is causing wear.