How many miles does the AMG SPEEDSHIFT MCT 7-speed go before rebuild?
09-25-2017, 10:27 PM
#26
Member
Chill peeps.
Regardless of how easy it is to talk **** about people behind a keyboard, I imagine the op's question isn't completely mentally handicapped.
If the MCT uses a wet clutch pack for starting from a stop, then in theory the startup clutch has a finite service life. Motorcycle clutches need replacement after a certain number of miles even though they are in an oil bath. Obviously lots of clutch up wheelies and stop n go traffic make that sooner than later.
Maybe there isn't a single C63 in the world that has been driven hard enough, long enough for its startup clutch to be used up, but someday it will happen. OP was just curious if anyone had gotten there yet, jeesh... Apparently C63 owners are a bunch of crab apples.
Still, so glad I've finally landed in one!!!
If the MCT uses a wet clutch pack for starting from a stop, then in theory the startup clutch has a finite service life. Motorcycle clutches need replacement after a certain number of miles even though they are in an oil bath. Obviously lots of clutch up wheelies and stop n go traffic make that sooner than later.
Maybe there isn't a single C63 in the world that has been driven hard enough, long enough for its startup clutch to be used up, but someday it will happen. OP was just curious if anyone had gotten there yet, jeesh... Apparently C63 owners are a bunch of crab apples.
Still, so glad I've finally landed in one!!!
09-26-2017, 07:27 AM
#28
MBWorld Fanatic!
There is not enough info about the MCT. All the information that I can find are reposts of the brief press release.
Where does the liquid that lubricates the ... clutch... clutches...come from? We know its not the transmission fluid, because people changed that fluid and the clutch "oil pan" was not drained. Is there a pump that moves this fluid?
how do you drain it and when changing these clutches, do you change the fluid too?
How many clutches and if there are several, why are several needed if it only operates from a standing start. BTW the press release was not that clear about this.
The press release indicated a higher efficiency, yet the MCT cars dyno less and have worse gas mileage. Maybe these are not adjusted right?
Did you notice how when the gas mileage subject comes up, turns out there are a few MCT cars that have much better gas mileage than everyone else? Maybe those are running right...
And finally I have this question:
One thing I hate about the speedshift auto 7 speed is that even if I put it in sport it will only cruise in 7th at 1500 rpm. When I want to do something, change lanes or whatever, I have to wait for it to shift and it is not sure how decisive I am, so tries to downshift 1 or 2 and to see how I respond, basically we negotiate how much torque I should get and in which gear I should be, and that takes time.
So, is there a way for the MCT to cruise at say 3000 RPM? like a normal stickshift car where this is where you want to cruise and there's enough torque at this engine speed?
Where does the liquid that lubricates the ... clutch... clutches...come from? We know its not the transmission fluid, because people changed that fluid and the clutch "oil pan" was not drained. Is there a pump that moves this fluid?
how do you drain it and when changing these clutches, do you change the fluid too?
How many clutches and if there are several, why are several needed if it only operates from a standing start. BTW the press release was not that clear about this.
The press release indicated a higher efficiency, yet the MCT cars dyno less and have worse gas mileage. Maybe these are not adjusted right?
Did you notice how when the gas mileage subject comes up, turns out there are a few MCT cars that have much better gas mileage than everyone else? Maybe those are running right...
And finally I have this question:
One thing I hate about the speedshift auto 7 speed is that even if I put it in sport it will only cruise in 7th at 1500 rpm. When I want to do something, change lanes or whatever, I have to wait for it to shift and it is not sure how decisive I am, so tries to downshift 1 or 2 and to see how I respond, basically we negotiate how much torque I should get and in which gear I should be, and that takes time.
So, is there a way for the MCT to cruise at say 3000 RPM? like a normal stickshift car where this is where you want to cruise and there's enough torque at this engine speed?
09-26-2017, 09:55 AM
#29
Super Member
Thread Starter
There is not enough info about the MCT. All the information that I can find are reposts of the brief press release.
Where does the liquid that lubricates the ... clutch... clutches...come from? We know its not the transmission fluid, because people changed that fluid and the clutch "oil pan" was not drained. Is there a pump that moves this fluid?
how do you drain it and when changing these clutches, do you change the fluid too?
How many clutches and if there are several, why are several needed if it only operates from a standing start. BTW the press release was not that clear about this.
The press release indicated a higher efficiency, yet the MCT cars dyno less and have worse gas mileage. Maybe these are not adjusted right?
Did you notice how when the gas mileage subject comes up, turns out there are a few MCT cars that have much better gas mileage than everyone else? Maybe those are running right...
And finally I have this question:
One thing I hate about the speedshift auto 7 speed is that even if I put it in sport it will only cruise in 7th at 1500 rpm. When I want to do something, change lanes or whatever, I have to wait for it to shift and it is not sure how decisive I am, so tries to downshift 1 or 2 and to see how I respond, basically we negotiate how much torque I should get and in which gear I should be, and that takes time.
So, is there a way for the MCT to cruise at say 3000 RPM? like a normal stickshift car where this is where you want to cruise and there's enough torque at this engine speed?
Where does the liquid that lubricates the ... clutch... clutches...come from? We know its not the transmission fluid, because people changed that fluid and the clutch "oil pan" was not drained. Is there a pump that moves this fluid?
how do you drain it and when changing these clutches, do you change the fluid too?
How many clutches and if there are several, why are several needed if it only operates from a standing start. BTW the press release was not that clear about this.
The press release indicated a higher efficiency, yet the MCT cars dyno less and have worse gas mileage. Maybe these are not adjusted right?
Did you notice how when the gas mileage subject comes up, turns out there are a few MCT cars that have much better gas mileage than everyone else? Maybe those are running right...
And finally I have this question:
One thing I hate about the speedshift auto 7 speed is that even if I put it in sport it will only cruise in 7th at 1500 rpm. When I want to do something, change lanes or whatever, I have to wait for it to shift and it is not sure how decisive I am, so tries to downshift 1 or 2 and to see how I respond, basically we negotiate how much torque I should get and in which gear I should be, and that takes time.
So, is there a way for the MCT to cruise at say 3000 RPM? like a normal stickshift car where this is where you want to cruise and there's enough torque at this engine speed?
However, that seems unnecessarily high for cruising with a 6.2 liter engine, even if you want lots of throttle response without a downshift.
Also, I suspect you will get notable oil consumption cruising at 3000 rpm.
Jim G
09-26-2017, 10:34 AM
#30
MBWorld Fanatic!
When I want to do something, change lanes or whatever, I have to wait for it to shift and it is not sure how decisive I am, so tries to downshift 1 or 2 and to see how I respond, basically we negotiate how much torque I should get and in which gear I should be, and that takes time.
09-26-2017, 01:01 PM
#31
Super Member
Just jab the throttle in S+, it will usually put you at 4-5k.
09-26-2017, 01:20 PM
#32
MBWorld Fanatic!
I have the pfl torque converter based 7 speed.
My curiosity was regarding them MCT, which I never experienced, if it has a mode in which it keeps the RPM moderately high.
But I see already that the MCT also cruises at 1500 rpm.
I am already using the paddles to keep it at 3000 part of the time.
It dawned on me to restrict the number of gears that it can shift up to, by using the shifter and keeping it in C5, but that doesn't seem to work well either, unless I shift into C5 once I start cruising. However, the advantage of doing this is that it can downshift even from there and in S it does it fast.
In the case of my car, there is no additional oil consumption that I have to complain about.
I don't keep it at 3000 for most miles I drive.
Honestly out of concern for the transmission, not the engine.
Also if there WAS a built in mode where it stays at 3000, I would not be worried that I am doing something that will kill it, in say 50,000 miles.
I live in an area with dense commute traffic, a lot of time things happen, there is no time for relaxed 7th speed 1500 rpm cruise.
Now when the traffic is stop and go or rubber necking, I let it do what it wants and be at 1500, but when the traffic is moderate, I have to go.....
The consumption difference for commute is between 12.5 MPG and 12 MPG. I lose .5
My curiosity was regarding them MCT, which I never experienced, if it has a mode in which it keeps the RPM moderately high.
But I see already that the MCT also cruises at 1500 rpm.
I am already using the paddles to keep it at 3000 part of the time.
It dawned on me to restrict the number of gears that it can shift up to, by using the shifter and keeping it in C5, but that doesn't seem to work well either, unless I shift into C5 once I start cruising. However, the advantage of doing this is that it can downshift even from there and in S it does it fast.
In the case of my car, there is no additional oil consumption that I have to complain about.
I don't keep it at 3000 for most miles I drive.
Honestly out of concern for the transmission, not the engine.
Also if there WAS a built in mode where it stays at 3000, I would not be worried that I am doing something that will kill it, in say 50,000 miles.
I live in an area with dense commute traffic, a lot of time things happen, there is no time for relaxed 7th speed 1500 rpm cruise.
Now when the traffic is stop and go or rubber necking, I let it do what it wants and be at 1500, but when the traffic is moderate, I have to go.....
The consumption difference for commute is between 12.5 MPG and 12 MPG. I lose .5
Last edited by Vladds; 09-26-2017 at 01:25 PM.
09-26-2017, 01:27 PM
#33
MBWorld Fanatic!
09-26-2017, 06:31 PM
#38
Super Member
Thread Starter
09-27-2017, 06:34 AM
#39
There is not enough info about the MCT. All the information that I can find are reposts of the brief press release.
Where does the liquid that lubricates the ... clutch... clutches...come from? We know its not the transmission fluid, because people changed that fluid and the clutch "oil pan" was not drained. Is there a pump that moves this fluid?
how do you drain it and when changing these clutches, do you change the fluid too?
How many clutches and if there are several, why are several needed if it only operates from a standing start. BTW the press release was not that clear about this.
The press release indicated a higher efficiency, yet the MCT cars dyno less and have worse gas mileage. Maybe these are not adjusted right?
Did you notice how when the gas mileage subject comes up, turns out there are a few MCT cars that have much better gas mileage than everyone else? Maybe those are running right...
And finally I have this question:
One thing I hate about the speedshift auto 7 speed is that even if I put it in sport it will only cruise in 7th at 1500 rpm. When I want to do something, change lanes or whatever, I have to wait for it to shift and it is not sure how decisive I am, so tries to downshift 1 or 2 and to see how I respond, basically we negotiate how much torque I should get and in which gear I should be, and that takes time.
So, is there a way for the MCT to cruise at say 3000 RPM? like a normal stickshift car where this is where you want to cruise and there's enough torque at this engine speed?
Where does the liquid that lubricates the ... clutch... clutches...come from? We know its not the transmission fluid, because people changed that fluid and the clutch "oil pan" was not drained. Is there a pump that moves this fluid?
how do you drain it and when changing these clutches, do you change the fluid too?
How many clutches and if there are several, why are several needed if it only operates from a standing start. BTW the press release was not that clear about this.
The press release indicated a higher efficiency, yet the MCT cars dyno less and have worse gas mileage. Maybe these are not adjusted right?
Did you notice how when the gas mileage subject comes up, turns out there are a few MCT cars that have much better gas mileage than everyone else? Maybe those are running right...
And finally I have this question:
One thing I hate about the speedshift auto 7 speed is that even if I put it in sport it will only cruise in 7th at 1500 rpm. When I want to do something, change lanes or whatever, I have to wait for it to shift and it is not sure how decisive I am, so tries to downshift 1 or 2 and to see how I respond, basically we negotiate how much torque I should get and in which gear I should be, and that takes time.
So, is there a way for the MCT to cruise at say 3000 RPM? like a normal stickshift car where this is where you want to cruise and there's enough torque at this engine speed?
The tech who was performing all procedures on my car mentioned that the fluid requirement for the the MCT is several litres less than on prefacelift automatic tranny.
09-27-2017, 10:00 AM
#40
I don't understand your comment, Blkrokt. As I pointed out in a post above this one, some of the newer technology trannys fail rather quickly. I just wanted to know what the apaprent track record is on our MCT trannys.
"Do you even think these through before posting?" Yes, I thought it through before posting. Did you think through yours before posting?
"What is the lifespan for ANY transmission before it requires a rebuild?" Depends on the tranny. A 6-speed manual in a Corvette or Camaro, if not abused, lasts a very long time. Whereas when GM installed its automatic in the Chevy SSR with the Corvette LS2 engine, GM had to add code to the ECM that reduced the engine's horsepower in 1st gear because that transmission, installed in the heavy (4850 lb before driver and gas) SSR, could not handle the loading. When I hotrodded the engine in my SSR, I had to buy a built tranny from Phoenix Transmissions, because the stock GM tranny lasted literally only weeks with the higher loading.
"Can't wait until tomorrow's post": I hadn't planned a post for tomorrow, but since you can't wait for one, I may try to oblige. Only because you asked, and I love you so much, Blkrokt.
Jim G
"Do you even think these through before posting?" Yes, I thought it through before posting. Did you think through yours before posting?
"What is the lifespan for ANY transmission before it requires a rebuild?" Depends on the tranny. A 6-speed manual in a Corvette or Camaro, if not abused, lasts a very long time. Whereas when GM installed its automatic in the Chevy SSR with the Corvette LS2 engine, GM had to add code to the ECM that reduced the engine's horsepower in 1st gear because that transmission, installed in the heavy (4850 lb before driver and gas) SSR, could not handle the loading. When I hotrodded the engine in my SSR, I had to buy a built tranny from Phoenix Transmissions, because the stock GM tranny lasted literally only weeks with the higher loading.
"Can't wait until tomorrow's post": I hadn't planned a post for tomorrow, but since you can't wait for one, I may try to oblige. Only because you asked, and I love you so much, Blkrokt.
Jim G
09-27-2017, 12:04 PM
#41
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09-27-2017, 04:23 PM
#43
