Rev match?
Thread Starter
Instructor
Joined: May 2012
Posts: 227
Likes: 14
From: Houston TX
Rev match?
Ok, so will this option be retained once you tune your car? what about once you supercharge or turbo it? what happens if you change the rev limiter? What about heads and cam? Very curious about all of this or should I say the whole NOT losing rev match at all. Thanks, 
Melting Slicks
Joined: May 2013
Posts: 2,416
Likes: 805
From: Argyle, Texas
Ok, so will this option be retained once you tune your car? what about once you supercharge or turbo it? what happens if you change the rev limiter? What about heads and cam? Very curious about all of this or should I say the whole NOT losing rev match at all. Thanks,
Pro
Joined: Oct 2000
Posts: 564
Likes: 0
From: Riverview Florida
Yes, yes, maybe, yes. The only thing that could affect rev matching would be rev limiter adjustments but I'm sure with some tweaking even those would be doable. Rev matching is done via sensors in the shift assembly that "predict" your next shift. These signals are then sent to the ECU which determines what gear you are about to shift into and how fast the engine should be revving in that gear at the speed you are currently traveling. Then the ECU tells the ECM to goose the throttle to the desired RPM while you release the clutch. All in a fraction of a second. It's pretty snazzy tech and a lot of fun...it also makes guys like myself who have monster feet and cant heel-toe to save my life look and sound much better than we actually are. Of course those that can heel toe are still at an advantage because rev matching isnt always perfect, especially when wheels start spinning...
Burning Brakes
Joined: Jul 2011
Posts: 907
Likes: 27
From: The Woodlands TX
Rev matching is used for down shifts. It basically revs to match engine speed with tranny speed to make the downshift much smoother. It's useful when coming into a corner hot as it doesn't upset the chasis or cause the back wheels to lock up for that split second.
You can rev match any car yourself using the heel-toe technique, it's just very difficult to do and takes a lot of practice.
Melting Slicks
Joined: Aug 2005
Posts: 2,874
Likes: 614
No this is not rev matching...
Rev matching is used for down shifts. It basically revs to match engine speed with tranny speed to make the downshift much smoother. It's useful when coming into a corner hot as it doesn't upset the chasis or cause the back wheels to lock up for that split second.
You can rev match any car yourself using the heel-toe technique, it's just very difficult to do and takes a lot of practice.
Rev matching is used for down shifts. It basically revs to match engine speed with tranny speed to make the downshift much smoother. It's useful when coming into a corner hot as it doesn't upset the chasis or cause the back wheels to lock up for that split second.
You can rev match any car yourself using the heel-toe technique, it's just very difficult to do and takes a lot of practice.
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Pro
Joined: Oct 2000
Posts: 564
Likes: 0
From: Riverview Florida
No this is not rev matching...
Rev matching is used for down shifts. It basically revs to match engine speed with tranny speed to make the downshift much smoother. It's useful when coming into a corner hot as it doesn't upset the chasis or cause the back wheels to lock up for that split second.
You can rev match any car yourself using the heel-toe technique, it's just very difficult to do and takes a lot of practice.
Rev matching is used for down shifts. It basically revs to match engine speed with tranny speed to make the downshift much smoother. It's useful when coming into a corner hot as it doesn't upset the chasis or cause the back wheels to lock up for that split second.
You can rev match any car yourself using the heel-toe technique, it's just very difficult to do and takes a lot of practice.
Last edited by es; May 30, 2013 at 01:58 PM.
Le Mans Master
Joined: Oct 2007
Posts: 8,396
Likes: 15
No this is not rev matching...
Rev matching is used for down shifts. It basically revs to match engine speed with tranny speed to make the downshift much smoother. It's useful when coming into a corner hot as it doesn't upset the chasis or cause the back wheels to lock up for that split second.
You can rev match any car yourself using the heel-toe technique, it's just very difficult to do and takes a lot of practice.
Rev matching is used for down shifts. It basically revs to match engine speed with tranny speed to make the downshift much smoother. It's useful when coming into a corner hot as it doesn't upset the chasis or cause the back wheels to lock up for that split second.
You can rev match any car yourself using the heel-toe technique, it's just very difficult to do and takes a lot of practice.
If you're coasting for a bit and put the car in neutral, the revs obviously drop to idle. From neutral, the car does not automatically assume you are dropping into a lower gear, it simply senses which gear you are going into based on how you move the shifter. Once it determines which gear you are going into, it matches the revs accordingly, whether it's a gear lower or higher than the previous one.
Le Mans Master
Joined: Oct 2007
Posts: 8,396
Likes: 15
On upshifts, the computer will simply hold the appropriate revs for the next gear so that the engagement is as smooth as possible. I know it seems counter-intuitive, but the rev-match's usefulness becomes more apparent when driving lazily around town rather than when driving it hard on the track.
Le Mans Master
Joined: Oct 2007
Posts: 8,396
Likes: 15
All the information that I have read says that rev matching is available on upshifts also - GM has touted patenting a new sensor on the shift linkage that works on upshifts. This is the basis of my question about keeping foot to the floor on upshifts. Will the sensor signal the system to drop the revs enough to match the rev needs of the next gear without buzzing the engine
This feature has been available on the 370Z since 2008 (2009 model year).
Race Director
Joined: Feb 2012
Posts: 10,776
Likes: 11
This is one of those bits that GM better do a great job of training people to use. Using/customizing the Driver Modes, using Rev-Matching, using the Performance Data Recorder, etc, etc, are going to require a significant group of teaching tools to ensure customer satisfaction.
Le Mans Master
Joined: Oct 2007
Posts: 8,396
Likes: 15
This is one of those bits that GM better do a great job of training people to use. Using/customizing the Driver Modes, using Rev-Matching, using the Performance Data Recorder, etc, etc, are going to require a significant group of teaching tools to ensure customer satisfaction.
Gas out - clutch in - select gear - clutch out - gas in.
Done.
Race Director
Joined: Feb 2012
Posts: 10,776
Likes: 11
I still haven't even made up my mind if I'll get an auto or manual.
Racer
Joined: Sep 2006
Posts: 300
Likes: 2
From: Leesburg VA
Quick blip of the throttle to downshift.
Lift throttle, shift to neutral, pause, upshift.
No clutch at all. No grinding at all.