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Old 11-14-2007, 04:04 PM   #1
Zyrtor
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Default How important is it to learn how to rev match?

I want to learn how to rev match because I was told it can lessen the shock on your tranny when you downshift. Is it even neccessary? I feel uncomfortable downshifting sometimes because I feel that nasty clunk sound. I have ridden with people who can do that and it feels sooo smooth when they do it.
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Old 11-14-2007, 04:07 PM   #2
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Not very important.

But, I like to do it because it feels smooth when down-shifting and its habitual now. Helps save the synchros a little bit and sounds cool when pulling into a ricer meet. Also helpful for going into 1st gear while still moving, which can be difficult in our cars.
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Old 11-14-2007, 04:12 PM   #3
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It takes some time to learn. I figured out it's really easy to do wearing dress shoes, since the sole is wide enough to brake and tap the gas at the same time. This way you don't have to heel-toe. It took me about 5,000 miles, but now I can do it easily every time.
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Old 11-14-2007, 04:12 PM   #4
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In autocrossing, i only do it do go back into 1st off a tight U-turn...

other than that, Brakes are cheaper than Transmissions.. no need to downshift to slow down

I cant say it wouldnt hurt to learn it, but I cant say that you MUST learn it either

EDIT: you don't have to heel-toe to blip the gas pedal before a downshift..
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Old 11-14-2007, 04:13 PM   #5
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i too am addicted to rev-matching. i just recently started doing it but i would say that about 80 percent of the time i hit the rpms right on. the other 20 percent of the time i'm either a little bit too high or too low when i let off the clutch.

it does help a bit i'm sure. but i look at it this way. which is cheaper to replace??

tranny, or brake pads?

you can slap pads on your car quickly and wayyyyyy cheaper than dropping the tranny and replacing it.

--J
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Old 11-14-2007, 04:17 PM   #6
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For daily driving you never need to use it, but if you are ever on a road course or pretend that the street is a road course then its pretty damned important to do it well.
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Old 11-14-2007, 04:21 PM   #7
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I do go into neutral to brake to a, let's say, a stop light, but what if you are driving and some guy pulls out in front of you going about 10-20 MPH on a highway in your lane (Happens all the time). If I want to move over to the other lane and I down shift to get more torque, because there are cars incomming in the other lane, can't you just revmatch so that you don't shock your transmission?
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Old 11-14-2007, 04:23 PM   #8
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Yeah, but its easy in that situation, just brake, after you are slowed down floor it and then downshift. And remember its better to guess to high with the rpms than to guess to low.
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Old 11-14-2007, 04:25 PM   #9
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I do it pretty much every downshift out of habit. It wont cause tranny problems if you dont grind it. Slowing down with downshifts obviously causes more wear on the clutch (only as much as a normal shift though) and thats way more expensive than brakes.

I have always used downshifting and the engine for minor slow downs and such, I only started rev matching because I was starting to do track days and needed to learn the skill so I did it to practice. It just became habit. *shrug*
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Old 11-14-2007, 04:28 PM   #10
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its habitual to me also, i was watching WAY too much Best MOTOring
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Old 11-14-2007, 04:36 PM   #11
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^^ I have to agree with several others above. Don't downshift to slow down, only downshift to go faster. Brakes are on the car for a reason, and they are indeed..._much_ cheaper than trannies and clutches.
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Old 11-14-2007, 04:51 PM   #12
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If you live in any place it snows, you WILL use down-shifting to slow down...


Best reason to double clutch:

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Old 11-14-2007, 05:04 PM   #13
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It's rarely necessary to use, but nice to know how. I, on the other hand, rev-match constantly when downshifting. if you're driving aggressively, it'll help to rev-match when down shifting so as to keep the weight transfer to a minimum in a turn (serious understeer/oversteer can occur)
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Old 11-14-2007, 05:10 PM   #14
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if you really want to drive your car fast (and by drive i mean something other than hauling ass in a straight line) doing it on every shift just makes it that much more of a muscle memory response for when you actually need it.
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Old 11-14-2007, 05:14 PM   #15
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What is a double clutch btw?
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Old 11-14-2007, 05:19 PM   #16
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Quote:
Originally Posted by Zyrtor View Post
What is a double clutch btw?
clutch in
out of gear
clutch out
rev
clutch in
into gear
proceed

useless unless you have a hurt transmission or no synchros
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Old 11-14-2007, 05:21 PM   #17
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clutch in
shift to neutral
clutch out
blip throttle
clutch in
select gear
clutch out

http://www.youtube.com/watch?v=0j-3xIZK-Bk
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Old 11-14-2007, 05:51 PM   #18
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Quote:
Originally Posted by Squidz View Post
^^ I have to agree with several others above. Don't downshift to slow down, only downshift to go faster. Brakes are on the car for a reason, and they are indeed..._much_ cheaper than trannies and clutches.
do you move the gear selector to different gears when the clutch is in and you are slowing down?

if you do, you are putting more wear on your synchros.

downshifting (and rev matching) won't have any more of a negative effect on your drive train than any thing else.

to save the synchros you should double-clutch, I'm sure others have chimed in on this, but anyway, I've driven a couple of cars over 100k miles downshifting with rev matching, but no double clutching, no synchro issues, and on my old integra I put almost 200k on it without seeing any noticable wear on the synchros.

anyway, know that there are potential issues not only with doing a downshift incorrectly, but that there are potential issues with wearing out the synchros faster.
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Old 11-14-2007, 05:55 PM   #19
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Don't go into too low a gear and let the clutch out, rev limiters don't prevent a 12K rpm connection to the tires.

Do braking first, then rev match.
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Old 11-14-2007, 05:56 PM   #20
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Quote:
Originally Posted by TyrannoSullyRex View Post
Don't go into too low a gear and let the clutch out, rev limiters don't prevent a 12K rpm connection to the tires.

Do braking first, then rev match.
5th to 1st is bad then?
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Old 11-14-2007, 06:05 PM   #21
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5th to 1st is bad then?
Not sure, I'll have to ask the moron friend of mine who did that in his Z3.
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Old 11-14-2007, 06:18 PM   #22
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Quote:
Originally Posted by TyrannoSullyRex View Post
Not sure, I'll have to ask the moron friend of mine who did that in his Z3.
I was in a Mustang GT when my friend went from 5th to 2nd. Not sure how he pulled that one off, but we made lots of white smoke.
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Old 11-14-2007, 06:42 PM   #23
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Old 11-14-2007, 06:49 PM   #24
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Quote:
Originally Posted by jasperw4 View Post
clutch in
shift to neutral
clutch out
blip throttle
clutch in
select gear
clutch out

http://www.youtube.com/watch?v=0j-3xIZK-Bk
Ugh thats so fast I had to watch that 8 times. I still do not get it.
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Old 11-14-2007, 06:55 PM   #25
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just start doing it whenever you drive. You'll get the hang of it and rev match like Speed Racer in no time.
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