Rev Match?
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From: Little Egg Harbor NJ
Rev Match?
Just picked up my new C7 and I don't understand Rev Match. Can somebody explain to me in simple terms what it is and what it does, why or why not I should use it.
Thanks in advance,
Joe
Thanks in advance,
Joe
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Sep 10, 2016, 09:37 PM
Thread Starter
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From: Little Egg Harbor NJ
Not sure
To Silver Stingray: Not sure whether your response is meant to be funny or condescending. Certainly doesn't seem appropriate. I asked a simple question and I didn't expect a snarky answer from a fellow forum member.
Melting Slicks
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From: Rochester NY
2018 C6 of Year Finalist
St. Jude Donor '10, '17
When you press down on the clutch, you are literally disconnecting the engine from the wheels. They are no longer "in sync". The engine speed will decrease once the clutch is depressed.
If you then shift to a lower gear (downshift), the engine will need to speed up rapidly once the clutch is released and re-engaged. This rapid increase in engine speed can cause the car to "lurch". It is a jolt that you can feel it is stressful to the car. It also robs the wheels of power due to a shift in momentum.
With Rev Match, as soon as you downshift, the throttle is "blipped". This is to bring the engine speed back up to an approximation of the wheel speed. The vehicles computer determines if/when this happens. By blipping the throttle, the engine speed will be closer to the wheel speed once the clutch is re-engaged (not depressed). This is a more favorable situation for you, and for the car. The computer can conceivably do it faster than a human and more accurately (old school heel-toe).
If you then shift to a lower gear (downshift), the engine will need to speed up rapidly once the clutch is released and re-engaged. This rapid increase in engine speed can cause the car to "lurch". It is a jolt that you can feel it is stressful to the car. It also robs the wheels of power due to a shift in momentum.
With Rev Match, as soon as you downshift, the throttle is "blipped". This is to bring the engine speed back up to an approximation of the wheel speed. The vehicles computer determines if/when this happens. By blipping the throttle, the engine speed will be closer to the wheel speed once the clutch is re-engaged (not depressed). This is a more favorable situation for you, and for the car. The computer can conceivably do it faster than a human and more accurately (old school heel-toe).
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From: Florida
Thread Starter
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Joined: Sep 2008
Posts: 88
Likes: 13
From: Little Egg Harbor NJ
Not sure
To Silver Stingray: Not sure whether your response is meant to be funny or condescending. Certainly doesn't seem appropriate. I asked a simple question and I didn't expect a snarky answer from a fellow forum member.
Last edited by Joeydeluxed; Sep 10, 2016 at 09:41 PM.
Melting Slicks
Joined: Jun 2005
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From: Rochester NY
2018 C6 of Year Finalist
St. Jude Donor '10, '17
Pay no attention to the guy Joey. It was a legitimate question. Rev Matching is commonly used in road racing when entering or leaving a turn. Called the heel-toe technique. You would have to hold your toe on the brake pedal and use your heel to blip the throttle, all with your right foot, with your left foot for the clutch. This would bring the engine back up to speed while the clutch is disengaged (depressed). The Rev match on our Vettes basically does away with the necessity of heel-toe. It also lessens to a large degree the lurch or jolt from downshifting, especially if that downshift would have put you at a much higher RPM than anticipated. Plus it sounds cool!
Last edited by Mordeth; Sep 10, 2016 at 09:49 PM.
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From: Little Egg Harbor NJ
Thanks!
Thanks for the explanation and thanks to the other forum members who also answered.
No thanks to the wise *** who wrote an idiotic reply.
No thanks to the wise *** who wrote an idiotic reply.
Pay no attention to the guy Joey. It was a legitimate question. Rev Matching is commonly used in road racing when entering or leaving a turn. Called the heel-toe technique. You would have to hold your toe on the brake pedal and use your heel to blip the throttle, all with your right foot, with your left foot for the clutch. This would bring the engine back up to speed while the clutch is disengaged (depressed). The Rev match on our Vettes basically does away with the necessity of heel-toe. It also lessens to a large degree the lurch or jolt from downshifting, especially if that downshift would have put you at a much higher RPM than anticipated. Plus it sounds cool!
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Drifting
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It may be worth practicing rev matching and heel/toe without the automatic assist so you can do it when driving a car without automatic rev match built in. When in busy traffic I use the auto rev match, but when on an empty twisty road I usually do it manually.
Team Owner
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However, Mordeth's point was that you no longer need to use the heel/toe technique on the track either while downshifting for a corner because your foot is now free exclusively for braking. The computer takes care of the rest.
Drifting
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From: South Lyon MI
When I talked to Andy Pilgrim a few weeks ago, he said that he liked the system and used it at the GS test for Automobile magazine.
For me, I heel and toe well enough but using the rev match on track allows for less "driver load" as they say, and it also allows me to remove a variable and turn more consistent laps while concentrating on other aspects of driving that I'll work on improving.
When you get the timing down with clutch release and braking, it's a huge boon to any non-pro driver, IMO. The timing is the most important function of the driver to make the rev match system work. It's doesn't just happen automatically but it's pretty simple to pick up with a little practice.
For me, I heel and toe well enough but using the rev match on track allows for less "driver load" as they say, and it also allows me to remove a variable and turn more consistent laps while concentrating on other aspects of driving that I'll work on improving.
When you get the timing down with clutch release and braking, it's a huge boon to any non-pro driver, IMO. The timing is the most important function of the driver to make the rev match system work. It's doesn't just happen automatically but it's pretty simple to pick up with a little practice.
Drifting
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From: Missi'ppi... no mo' MO for me!!
I can't remember where I read it, but it was also strongly suggested that rev-matching be left turned off until the engine is warm enough so it doesn't "over-rev" early while the fluids are 'cold'. I don't usually engage RM until the oil temps are at least in the 180s. Sometimes I forget to turn it on--and I should; probably nothing can match up the clutch's friction plate revolutions better than the computer. But the psychologically objectionable part is, it's also 'just another nanny'.
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Drifting
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From: Terrell North Carolina
Rev match is a neat option, even the drivers at Spring Mountain use it when driving the Vetts in the class. They use to teach heal & toe, but since Rev Match came along, they now just tell you how to turn it on, as far as I am concerned, greatest thing yet for a manual tranny, would hate to be with out it on my Z, it is second nature that I turn it on as soon as the engine warms up.
