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      03-16-2011, 10:47 PM   #1
Prince_of_Persia
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Perfect Rev Matching for 6MT M3

Hey guys,

I have been driving my first manual car (M3) for the last three months and I am loving it!
I am practicing for rev matching these days and I wanted to hear some expert opinion about it. Do you always add almost 1000 RPM to go to the lower gear? Is there any different between rev matching that you have to do to go from 5th gear to 4th or 3rd gear to 2nd?

Any help is really appreciated!

Thanks!
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      03-16-2011, 10:54 PM   #2
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Quote:
Originally Posted by Prince_of_Persia View Post
Hey guys,

I have been driving my first manual car (M3) for the last three months and I am loving it!
I am practicing for rev matching these days and I wanted to hear some expert opinion about it. Do you always add almost 1000 RPM to go to the lower gear? Is there any different between rev matching that you have to do to go from 5th gear to 4th or 3rd gear to 2nd?

Any help is really appreciated!

Thanks!
If you're just learning to rev-match, don't worry so much about bringing the RPM's up some predetermined amount. Instead, just quickly push the clutch in, "blip" the throttle, and shift into your lower gear. That blip should be very quick, but don't be scared about applying pressure - make your engine roar!

When I first started driving manual, I had trouble with the downshift revmatch. Then I realized that I was overthinking it... eventually, I had much better results just listening to exhaust/engine note when I blipped the throttle. Keep practicing, buddy!
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      03-16-2011, 11:10 PM   #3
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About all the advice I can give you is just keep practicing. The RPM drop from gear to gear will vary depending on the ratios you are changing between. Also your rate of deceleration at the time of your shift (eg coasting, or during hard braking) will affect where the RPMs will end up after the change. In all cases the amount of throttle needed to perfectly match revs varies a little.

Having sport or sport+ enabled makes rev matching a little bit easier because less less input is needed to blip the throttle.

I've been doing it for so many years now that I do it without even thinking about it.
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      03-16-2011, 11:51 PM   #4
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The joy of it all is to become experienced enough to know how much to blip the throttle for any given downshift, as it's different depending on the gear you're in, and the speed your at. In comparison, the DCT's computer is smarter than any of us, so on those models, it's always perfect. But there is nothing like a perfectly executed rev-matched downshift on a 6MT. It also helps when you have a free and high reving engine (like the S65 or F20C). An engine with nice intake and exhaust noises also make it that much sweeter.
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      03-17-2011, 02:08 AM   #5
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Quote:
Originally Posted by piloto View Post
The joy of it all is to become experienced enough to know how much to blip the throttle for any given downshift, as it's different depending on the gear you're in, and the speed your at. In comparison, the DCT's computer is smarter than any of us, so on those models, it's always perfect. But there is nothing like a perfectly executed rev-matched downshift on a 6MT. It also helps when you have a free and high reving engine (like the S65 or F20C). An engine with nice intake and exhaust noises also make it that much sweeter.
Yeah I have tried several times and a few times it worked really well! It is so much fun doing it, but I need to get better at it.

I didnt think about putting my setting on sport mode when I was rev matching. Thanks for the advice.
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      03-17-2011, 02:41 AM   #6
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"Perfect Rev Matching" on (6)MT? lulz
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      03-17-2011, 02:58 AM   #7
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Quote:
Originally Posted by OC3 View Post
"Perfect Rev Matching" on (6)MT? lulz
It's far more satisfying when you get it right yourself than a computer doing it for you every time.
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      03-17-2011, 03:14 AM   #8
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Again, "perfect Rev Matching" on (6)MT? lulz
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      03-17-2011, 05:39 AM   #9
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Quote:
Originally Posted by OC3 View Post
Again, "perfect Rev Matching" on (6)MT? lulz
Don't laugh... my instructor at the BMW HPDE last year was perfect. He was so good, you would have thought my car was a DCT. I aspire to that.
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      03-17-2011, 05:41 AM   #10
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You "thought" he was perfect.
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      03-17-2011, 05:46 AM   #11
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i don't see what you are lulzing about. rev match can be done perfectly by human. the shift speed is slower yes but the match is perfect. also do a perfect rev match 5-3 or 5-2 downshift on the DCT and tell me how that works out.
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      03-17-2011, 05:47 AM   #12
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Quote:
Originally Posted by OC3 View Post
You "thought" he was perfect.
Isn't that all that matters
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      03-17-2011, 05:54 AM   #13
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Quote:
Originally Posted by karussell View Post
i don't see what you are lulzing about. rev match can be done perfectly by human. the shift speed is slower yes but the match is perfect. also do a perfect rev match 5-3 or 5-2 downshift on the DCT and tell me how that works out.
Humans can do it reasonably well, not perfectly.

In any case, what I'm lulzing about is all this talk about how satisfying doing it well is. Come on, it's no monumental achievement. It's not a difficult thing to do. After doing it a thousand times, it's like... meh.


Quote:
Originally Posted by gthal View Post
Isn't that all that matters
Sometimes, sure.
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      03-17-2011, 07:18 AM   #14
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Which is more accurate?
Your heel or your hand.
Your toes or your fingers.
Your brain or your computer. (oh and for those who believe their brain works better, try 1766/31 x 45)

Just sayn!
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      03-17-2011, 07:42 AM   #15
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Please not another DCT vs 6MT. Wow..

Have fun OP!!
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      03-17-2011, 08:34 AM   #16
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Quote:
Originally Posted by OC3 View Post
Humans can do it reasonably well, not perfectly.

In any case, what I'm lulzing about is all this talk about how satisfying doing it well is. Come on, it's no monumental achievement. It's not a difficult thing to do. After doing it a thousand times, it's like... meh.
Yeah you're right, who cares what other people like. I just want to hear about what you like.
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Last edited by jmflukeiii; 03-17-2011 at 08:44 AM.
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      03-17-2011, 08:43 AM   #17
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Quote:
Originally Posted by CarForHire View Post
Please not another DCT vs 6MT!!
Comon.. It's been like 26 hours without a 6MT Vs DCT thread.. This one has a very good potential..Please
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      03-17-2011, 08:47 AM   #18
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Quote:
Originally Posted by OC3 View Post
You "thought" he was perfect.
better than thinking dct is perfect
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      03-17-2011, 08:59 AM   #19
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I've been practiing my heel toe for a while now. I get it right often but my biggest problem Is how fast to release the clutch. Too fast and if your not exactly on the shift won be smooth. But too slow and the engine falls off the rpms too quickly. Im thinking about removing the spring on my clutch to see if it will help with smoother shifts
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      03-17-2011, 09:02 AM   #20
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I believe many people can downshift much better than a DCT. Anyone with any driving skill that has driven both the DCT and the manual M3s will tell you the same thing. And yes, I've had both a 6sp e90 and DCT e90.

The DCT does a very quick blip of the throttle then performs a painfully slow release of the clutch.

I pop the clutch while moving the lever to neutral. I next rev the engine to somewhere near where I need to be with the clutch ENGAGED and put it into the lower gear without disengaging the clutch completely. This is way faster in practice than the DCT.

I still prefer the DCT for mostly street driven cars; which is the vast majority of them.
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      03-17-2011, 09:02 AM   #21
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Quote:
Originally Posted by sameh View Post
Which is more accurate?
Your heel or your hand.
Your toes or your fingers.
Your brain or your computer. (oh and for those who believe their brain works better, try 1766/31 x 45)

Just sayn!
have you ever played baseball? think about the math your brain does to calculate trajectory along with coordinating the millions of cells in your body to catch it. computer processors have a long way to go before they catch up.

back to topic. OP just keep practicing. Your super computer resting on your shoulders will know exactly the right RPM to rev match no matter the speed, deceleration rate, or number of gears once its had enough data and it won't even require you looking at the tach.
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      03-17-2011, 10:56 AM   #22
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In addition, if you let say rev too much, you can always delay the clutch in. It all needs practice eventually. When I was practicing I was watching the rev counter.. Sometime later you can do by ear... Sometime later it becomes second nature.

Don't rush for heel&toe though. First perfect your rev matching skill.
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