[adamizme]

There isn't any evidence to back this up and I may be completely wrong, but I'm not sure rev matching or even engine braking is a great idea when your motor is cold. That may be why it doesn't stay enabled. I purposely wait until my car is warmed up before turning on rev matching.

I love the feature, but I find myself "disabling" it by manually blipping the throttle most of the time. I didn't have rev matching in my old car... old habits and what-not. That said, I can't wait to use rev matching on track! I never did get heal toe down so I'd end up dumping the clutch in my previous car when down shifting while braking.

[DenverTaco07]

Originally Posted by adamizme

There isn't any evidence to back this up and I may be completely wrong, but I'm not sure rev matching or even engine braking is a great idea when your motor is cold. That may be why it doesn't stay enabled. I purposely wait until my car is warmed up before turning on rev matching.

I love the feature, but I find myself "disabling" it by manually blipping the throttle most of the time. I didn't have rev matching in my old car... old habits and what-not. That said, I can't wait to use rev matching on track! I never did get heal toe down so I'd end up dumping the clutch in my previous car when down shifting while braking.

i get where you are going with that, but i think the downshift would have to be really drastic, if it is in fact an issue with a "cold" engine, but if that was true they wouldnt let it turn on until a certain temp was reached...??

[Cldgin2]

I just got my m6... I'm an old school shifter. What exactly does rev match do for me? In English lol. When I turn it on, it makes a bunch of noise but seems to effect my breaking, where when off I feel I get more from downshifting

[adamizme]

Originally Posted by DenverTaco07

i get where you are going with that, but i think the downshift would have to be really drastic, if it is in fact an issue with a "cold" engine, but if that was true they wouldnt let it turn on until a certain temp was reached...??

Building in a correlation between temperature and rev matching in the ecu would make sense if it were a huge issue, but I doubt it's that big of an issue. Besides, would you want your car to lock you out of a feature until it sees fit? It's your car, you should be able to treat it as you wish.

[Dubchitts]

Originally Posted by adamizme

There isn't any evidence to back this up and I may be completely wrong, but I'm not sure rev matching or even engine braking is a great idea when your motor is cold. That may be why it doesn't stay enabled. I purposely wait until my car is warmed up before turning on rev matching.

I love the feature, but I find myself "disabling" it by manually blipping the throttle most of the time. I didn't have rev matching in my old car... old habits and what-not. That said, I can't wait to use rev matching on track! I never did get heal toe down so I'd end up dumping the clutch in my previous car when down shifting while braking.

So long as it's smooth and your not going from like 60mph in 6th to 3rd or something it's fine. Just keep your rpms low like normal for the warmup

[DenverTaco07]

Originally Posted by Cldgin2

I just got my m6... I'm an old school shifter. What exactly does rev match do for me? In English lol. When I turn it on, it makes a bunch of noise but seems to effect my breaking, where when off I feel I get more from downshifting

The real purpose of rev match is to automate heal-toe driving - downshifting while braking, so folks don't have to do heal-toe themselves.

I use it each time I drive though - it makes the downshifts so smooth (I could blip the throttle myself I suppose to make them as smooth) during braking as well as highway driving or street driving IMO.

Not sure how it affects your braking - you'd have to clarify.

I take it you don't blip the throttle yourself when downshifting with regards to "old school shifter"?

[JR91]

Does anyone know if the auto rev match will still blip the throttle if you downshift into a wrong gear causing your RPMs to exceed redline?

[BoostedB]

I was at the Corvette driving school last year at spring mountain. The instructors told us that the reason GM doesn't have rev match on as default is that Nissan's patent on their own rev match feature actually includes this. So as to not infringe on patent rights, GM had to make theirs off by default and select-able on/off. Again, just what I was told.

[jlagman]

Originally Posted by Cldgin2

I just got my m6... I'm an old school shifter. What exactly does rev match do for me? In English lol. When I turn it on, it makes a bunch of noise but seems to effect my breaking, where when off I feel I get more from downshifting

Under spirited driving conditions, when you downshift, your engine speed will jump; ever downshift while running the car hard and it bucks when you get off the clutch? A rev match is just you (or in this case, the car) blipping the throttle to increase engine speed in preparation for the downshift, for the purpose of a smoother gear transition.

Heel-toe is essentially rev matching while braking.

Honestly, I just love the noise, I rev match my truck the old fashioned way when I ascend steep hills.

[Norm Peterson]

Originally Posted by Cldgin2

I just got my m6... I'm an old school shifter. What exactly does rev match do for me? In English lol. When I turn it on, it makes a bunch of noise but seems to effect my breaking, where when off I feel I get more from downshifting

Rev matching (whether done electronically or by you and your right foot) puts the revs up to where the downshifted gear needs them to be for a downshift so smooth that you hardly notice it.

The difference in braking happens because without any rev-matching your clutch engagement has to speed the engine up to the rpms that the new gear needs them to be at, which introduces engine compression braking in whatever amount it takes to get the engine "up to speed". The noise is the engine being revved, except you're not doing it, so as an old-school driver and probably not a road-racer either, you probably aren't primed to expect this.

On a road course out near maximum cornering you do not want to introduce compression braking, as it brings on the risk of momentarily (albeit only partially) locking the rear tires. Which encourages them to snap wide and try passing the front tires. A similar situation could exist on the street in wet weather or worse conditions.


Norm

[nancygrl]

only use rev matching sparingly....not sure if it should be on by default, but agree it should be configurable in the driving menu.

[JR91]

Do other car manufacturers with rev matching (Porsche and BMW) have it on by default?

[I`m Batman]

Other than making cool noise and smoother downshifts and track use... I'm not a mechanic... but doesn't it reduce clutch wear as well since the clutch and flywheel are spinning at the same speed when they make contact? And reduce impact on the gearbox as well?

[Lafourche1]

Click on the picture and the video plays. At the end of the straight you hear two rev matched shifts as I was under braking. Under these speeds, dropping from 5th straight to third, without a rev match, would have put the car somewhere in the weeds as the backend would have broken loose and things would have gotten out of hand from there.