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Rev Match Response Time with Modes?

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Old Mar 28, 2014 | 11:41 PM
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Default Rev Match Response Time with Modes?

Does the speed of the blip with rev match change depending on the mode of the car? For example, if I shifted from say 5th to 2nd in ECO mode, would it be slower to match the Revs vs being in SPORT or TRACK mode?
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Old Mar 28, 2014 | 11:47 PM
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shift from 5th to 2nd.
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Old Mar 28, 2014 | 11:49 PM
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Originally Posted by themonk
shift from 5th to 2nd.
That was just an example, but what's wrong with that? Lets say you're cruising along at 60MPH and need to suddenly slam the brakes...2nd has a pretty wide range in terms of speed and can easily handle that... unless I'm missing something..
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Old Mar 29, 2014 | 12:03 AM
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Rev match is based on a one gear downshift so it's unlikely to do anything close to what's needed for a multi gear drop.
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Old Mar 29, 2014 | 12:08 AM
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Originally Posted by djseto
That was just an example, but what's wrong with that? Lets say you're cruising along at 60MPH and need to suddenly slam the brakes...2nd has a pretty wide range in terms of speed and can easily handle that... unless I'm missing something..
not me, brake suddenly......clutch in, shift to neutral and hard on brakes....I don't know just how many RPM's you'd be at in 2nd at 60 but I can't think of any circumstance in which you'd need to go from 5th to 2nd...not saying it's wrong, I just wouldn't do it.
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Old Mar 29, 2014 | 12:23 AM
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Originally Posted by mjw930
Rev match is based on a one gear downshift so it's unlikely to do anything close to what's needed for a multi gear drop.
Isn't the whole point of rev match in a car like this to aid in downshift times...especially in track applications? I can heal-toe the "old fashioned" way, but where did you read it was designed for one gear drops?
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Old Mar 29, 2014 | 12:27 AM
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Originally Posted by themonk
not me, brake suddenly......clutch in, shift to neutral and hard on brakes....I don't know just how many RPM's you'd be at in 2nd at 60 but I can't think of any circumstance in which you'd need to go from 5th to 2nd...not saying it's wrong, I just wouldn't do it.
What about braking hard before entering a corner? I guess I'm comparing the benefit vs Dual clutch tranny. When I did the BMW 2 Day M school, it was pretty common to be in say 4th gear on a straight, brake hard, go down 2 gears to 2nd to enter a turn. This is high performance car...I guess I'd surprised if rev match was never intended to drop more than one gear.
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Old Mar 29, 2014 | 12:28 AM
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I thought rev match simply read sensors for shifter location and speed and matched revs accordingly. I didn't think it was limited to 1 gear at a time. I often am pulled to the 3-4 gate when I don't want it by a strong spring, and I can hear the revs match. Sometimes, that's how I know it's not the intended gate. But I don't think the mode selector would have any effect on it.
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Old Mar 29, 2014 | 12:31 AM
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Owners manual says it matches up to 5400rpm. FYI the max speed for 2nd gear in the manual says 67mph
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Old Mar 29, 2014 | 01:52 AM
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Originally Posted by djseto
Owners manual says it matches up to 5400rpm. FYI the max speed for 2nd gear in the manual says 67mph
at what RPM and is that for a Z51 or non?
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Old Mar 29, 2014 | 06:50 AM
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Originally Posted by mjw930
Rev match is based on a one gear downshift so it's unlikely to do anything close to what's needed for a multi gear drop.
I think he's talking on a MT car... it will rev match any gear change.

That's one of the disadvantages of an auto... multiple gear downshift time when in manual mode.

Last edited by gthal; Mar 29, 2014 at 07:03 AM.
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Old Mar 29, 2014 | 06:53 AM
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Originally Posted by arcticblast
I thought rev match simply read sensors for shifter location and speed and matched revs accordingly. I didn't think it was limited to 1 gear at a time. I often am pulled to the 3-4 gate when I don't want it by a strong spring, and I can hear the revs match. Sometimes, that's how I know it's not the intended gate. But I don't think the mode selector would have any effect on it.
I think the poster was thinking about the auto.

OP... I have not noticed a change in rev match speed due to mode but in any mode it is very fast.
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Old Mar 29, 2014 | 06:59 AM
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It will match no matter what gear you're coming from and going to.
In the OP's example 2 from 5 is certainly extreme and not advised. On my Z51 just going from 3 to 2 seems to over rev at times.
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Old Mar 29, 2014 | 09:16 AM
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I never assumed it was an auto. I've also read that unless you are driving aggressively the rev match will always seem to over rev since it's calibrated for performance driving, not around town but that could be wrong too. I was not aware there was a sensor for shifter position but I imagine it makes sense their would be for situations where you come off a fast straight, say in 4th and brake hard for a 2nd gear turn.

Then again, you could turn it off and do it the old fashion way
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Old Mar 29, 2014 | 09:28 AM
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Originally Posted by mjw930
I never assumed it was an auto. I've also read that unless you are driving aggressively the rev match will always seem to over rev since it's calibrated for performance driving, not around town but that could be wrong too. I was not aware there was a sensor for shifter position but I imagine it makes sense their would be for situations where you come off a fast straight, say in 4th and brake hard for a 2nd gear turn.

Then again, you could turn it off and do it the old fashion way
The MT in the C7 senses what gear you are going to and rev matches for that gear whether it is 1 or more gears in the difference. You can actually get the car to rev up and down by moving the shifter around.

I consider myself to be very well versed in heel/toe driving from 100's of track hours... to the point that when I do it on the track I don't even realize I'm doing it. The rev match in the C7... around town or in aggressive driving... is pretty much as fast and as or more accurate than I would likely be. It is pretty neat actually.

I'll still do it myself on the track just because but I really wouldn't need to if I didn't want to... the C7 is that good IMO.
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Old Mar 29, 2014 | 09:31 AM
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Originally Posted by gthal
The MT in the C7 senses what gear you are going to and rev matches for that gear whether it is 1 or more gears in the difference. You can actually get the car to rev up and down by moving the shifter around.

I consider myself to be very well versed in heel/toe driving from 100's of track hours... to the point that when I do it on the track I don't even realize I'm doing it. The rev match in the C7... around town or in aggressive driving... is pretty much as fast and as or more accurate than I would likely be. It is pretty neat actually.

I'll still do it myself on the track just because but I really wouldn't need to if I didn't want to... the C7 is that good IMO.
Cool, thanks. I learn something new every day. I too have 100's of hours on the track and heel toe without even realizing it so I will be really keen to understand the rev matching algorithm when I get mine in about 8 weeks
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Old Mar 29, 2014 | 09:37 AM
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Originally Posted by mjw930
Cool, thanks. I learn something new every day. I too have 100's of hours on the track and heel toe without even realizing it so I will be really keen to understand the rev matching algorithm when I get mine in about 8 weeks
There isn't much to understand - when you downshift the vehicle senses the gear you are seeking when the clutch is depressed. It then matches the RPM to what it will be when you release the clutch in that gear at that speed. Simple.
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Old Mar 29, 2014 | 09:40 AM
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Originally Posted by mjw930
I never assumed it was an auto. I've also read that unless you are driving aggressively the rev match will always seem to over rev since it's calibrated for performance driving, not around town but that could be wrong too. I was not aware there was a sensor for shifter position but I imagine it makes sense their would be for situations where you come off a fast straight, say in 4th and brake hard for a 2nd gear turn.

Then again, you could turn it off and do it the old fashion way
It works just fine for me in around town driving.
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Old Mar 29, 2014 | 09:42 AM
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Originally Posted by level6
It works just fine for me in around town driving.
Yet there are dozens if not hundreds of posts about people complaining how it works around town? I don't have mine yet so I'm just parroting what's been typed by others.
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Old Mar 29, 2014 | 09:45 AM
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Originally Posted by mksz51
There isn't much to understand - when you downshift the vehicle senses the gear you are seeking when the clutch is depressed. It then matches the RPM to what it will be when you release the clutch in that gear at that speed. Simple.
I know, that's what I thought too when it was first announced but then why so many questions on this and other forums? Apparently it works differently than many expect.
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