Quote:
Originally Posted by executor
correct me if i'm wrong but i'm pretty sure that by not adding gas while moving out the clutch; you will also wear out your clutch
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So let's think about this for a moment: the clutch is connecting two plates to transmit power/torque from engine to transmission. One plate is connected to the engine while the other one is connecting to the input shaft of the transmission. When you press the clutch, these two plates are disconnect. When you release the clutch, these plates are connected. When you release the clutch to the grab point, that is where these two plates start to connect.
So far, so good.
Now, let just say if on a flat ground and the car is stopped and not moving. The clutch is pressed (disconnect), brake is release and you shift to 1st gear. The gear is connected to the input shaft, which is idle because the car is not moving. The clutch plate on the engine side is spinning at idling RPM (assume it is 800 rpm for warmed up car). Now you release the clutch to the grabbing point, those two plates, one spinning at 800 RPM (or 13.3 rev per second) while the other is stationary, are trying to connect together. When you gently release the clutch to make connection, these two plates connects (grab) and the engine sends power to the input shaft, which sends the power to the transmission, and get the car moves. So your car moves.
So far so good, this is just the basics of how a car moves, right?
Observe the statements above, where does the *wear* of a clutch come in? That happens when two plates that are running different revs are trying to connect and sync the revs. To do so, the material on the plates need friction to sync the rev. This causes friction and heat, and the material would be lost gradually.
To reduce the clutch wear and make a smooth transition, it is the best when connecting these two plates they are already in sync, or very small difference, in terms of their respective revolutions.
This, IMO, is the fundamental theory of rev matching. The idea of rev matching is to rev the engine revolution with the revolution of input shaft that is connected to the gears in transmission and the driving wheels. It is all happening on the clutch.
So, if we go back to our original situation: flat ground, car stationary, clutch in, 1st gear, no brake. Whether adding gas or not, you are wearing out the clutch. The key question is by how much. Adding gas before connecting the plates, the plate on the engine side is at higher RPM while the input shaft is idle. The difference in rev is higher, more wear. Not adding gas before connection, idle rev, less difference, less wear.
In summary, your statement is correct in one way: not adding gas while releasing clutch, you will wear out the clutch.
However, by doing this it will wear out
less than that if you add gas while connecting those two plates.
In other words, that statement is correct but not effective. Clutch is a wear item, and their mileage depends on how it is used. If you ease on it, it can last longer. If you keep dumping the clutch on start up, it will need to be replace sooner. It is as simple as people already said below.
Quote:
Originally Posted by daiheadjai
IIRC, the clutch is a wear item (like brake pads).
Regardless of how you use them, as long as you use them, they will wear out.
The question is which method can spare the most unnecessary wear and tear.
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Quote:
Originally Posted by Suberman
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Reasonable driving tends to wear out a clutch around 80,000 miles these days.
Dump and run acceleration runs can shorten clutch life considerably.
The key to remember is the clutch doesn't wear at all until you push the clutch pedal. The more efficiently and smoothly you drive, especially on a track, the longer your clutch lasts.
I know skilled but conservative drivers who get well over 100,000 miles out of one clutch.
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