Colling of turbos
Thread Starter
Newbie
Joined: Aug 2021
Posts: 9
Likes: 0
Mercedes c63 v8 biturbo 2017
Colling of turbos
Hi everyone I'm new to the forum. This is probably a silly question. But from my knowledge its good practice after a long drive to let the car run for a while so the turbos can cool down before turning the car off. Yes?
However when the car is being drove in comfort mode even for long distances or long time. It turns its self off when stopping at junctions roundabouts traffic lights
So is this damageing the turbos?????
However when the car is being drove in comfort mode even for long distances or long time. It turns its self off when stopping at junctions roundabouts traffic lights
So is this damageing the turbos?????
Out Of Control!!
Joined: Nov 2018
Posts: 11,451
Likes: 5,352
From: San Francisco Bay Area
2019 C63CS
In general its always good to do a cool down after driving the car hard, so the fluids keep circulating and bring everything back down to normal operating temperatures. The brakes should also be cooled before parking the car or coming to a longer stop and staying on the brakes, as the brake pads will imprint on the hot rotors otherwise and cause uneven brake pad deposits. These cars have sophisticated cooling, though. When you come to a stop there is separate cooling for the turbos. The fan will kick in to cool the turbos. If you open the hood you can see air channels specifically for the turbos and you might have noticed that if the car is hot and you park it, the fan can run for up to 10 minutes to cool the turbos. A very common phenomenon for these Hot-V turbo setups. I always wait until the fan stops before closing my garage so that much of this hot air blows out into the environment and when I go for a hard drive in the canyons I take it easy afterwards to cool everything down before coming to a stop and turn off the car. As for auto start/stop I turn that off first thing after starting the car. It's a silly feature on an AMG. Many times it only turns off the engine just to restart it a couple of seconds later.
Thread Starter
Newbie
Joined: Aug 2021
Posts: 9
Likes: 0
Mercedes c63 v8 biturbo 2017
Thread Starter
Newbie
Joined: Aug 2021
Posts: 9
Likes: 0
Mercedes c63 v8 biturbo 2017
In general its always good to do a cool down after driving the car hard, so the fluids keep circulating and bring everything back down to normal operating temperatures. The brakes should also be cooled before parking the car or coming to a longer stop and staying on the brakes, as the brake pads will imprint on the hot rotors otherwise and cause uneven brake pad deposits. These cars have sophisticated cooling, though. When you come to a stop there is separate cooling for the turbos. The fan will kick in to cool the turbos. If you open the hood you can see air channels specifically for the turbos and you might have noticed that if the car is hot and you park it, the fan can run for up to 10 minutes to cool the turbos. A very common phenomenon for these Hot-V turbo setups. I always wait until the fan stops before closing my garage so that much of this hot air blows out into the environment and when I go for a hard drive in the canyons I take it easy afterwards to cool everything down before coming to a stop and turn off the car. As for auto start/stop I turn that off first thing after starting the car. It's a silly feature on an AMG. Many times it only turns off the engine just to restart it a couple of seconds later.
Out Of Control!!
Joined: Nov 2018
Posts: 11,451
Likes: 5,352
From: San Francisco Bay Area
2019 C63CS
Skratch thanks. This helps a lot. Is this also the same procedure if I'm driving in sport plus for example can I just turn the car off and It will run the oil through the pumps to cool of itself. Sorta sick of sitting about for 5 minutes outside the house after coming home waiting on cool down. I know these questions are probably silly. But just trying to look after the car as best I can
Last edited by superswiss; Aug 2, 2021 at 05:59 PM.
MBWorld Fanatic!
Joined: May 2015
Posts: 4,037
Likes: 1,012
From: Miami, FL
2003 CL 600
Oil pump is engine driven, so there is no oil going though when it shuts down. But the turbos are cooled by engine coolant, and those coolant circuits have auxiliary electric pumps that can run with the engine stopped or after you turn the car off to keep the turbos at a reasonable temp. Because of this, the oil in the stationary turbos never gets hot enough to bake off, which is the old school reason for letting an engine idle down for a little after driving, because you didn't have coolant in there and had to rely on the fresh oil supply to moderate turbo temperature.
Trending Topics
MBWorld Fanatic!
Joined: Mar 2008
Posts: 3,632
Likes: 150
C63s Cabriolet, BMW M4, Civic
MB World Stories
The Best of Mercedes & AMG
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)
Verdad Gallardo
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
Out Of Control!!
Joined: Nov 2018
Posts: 11,451
Likes: 5,352
From: San Francisco Bay Area
2019 C63CS
Those points are highly debatable unfortunately. You might actually get worse MPG depending on where and how you drive. EE has a good video showing that the engine needs to be off for at least 7 seconds before the fuel savings actually offset the extra fuel it takes to restart the engine. In my experience at least where and how I drive the engine often restarts in less than 7 seconds. Often I come to a stop, just as the light turns green a couple of seconds later, so I actually wasted fuel at that moment. Less wear is specifically debatable. Constantly restarting the engine by any means does not reduce wear. On the contrary. I can get on board with reducing air pollution, but again, the air pollution is higher during engine restart, so if the engine isn't turned off long enough you might indeed pollute more. It has been shown that *** can increase fuel economy by up to 8% in the ideal city environment and with efficient engines to begin with, but I'm willing to bet you that you don't even get close to that with the AMG V8. The feature is there, because the test cycles have a lot of idle time and it benefits the manufacturers to show higher MPG on paper. Real world is a different story. I actually leave it on whenever I'm stuck with a 4-banger loaner. First off, it's more pleasant for the engine to shut off instead of listening to the sewing machine at idle, and with those small efficient engines the engine actually stays off until I start moving again for the most part. In my experience that's simply not the case with the V8.
Last edited by superswiss; Aug 2, 2021 at 07:54 PM.
MBWorld Fanatic!
Joined: Mar 2008
Posts: 3,632
Likes: 150
C63s Cabriolet, BMW M4, Civic
As for less wear, every time an engine is not running is considered no wear in parts.
Out Of Control!!
Joined: Nov 2018
Posts: 11,451
Likes: 5,352
From: San Francisco Bay Area
2019 C63CS
It's cool if you like it. I'm not trying to make you stop using it. I just highly doubt you are saving much fuel or do much for the environment. If you wanna prove me wrong, drive one month with it off and one month with it on and compare the mpg, assuming you are willing to conduct a fair and consistent test.
Last edited by superswiss; Aug 2, 2021 at 10:23 PM.
MBWorld Fanatic!
Joined: Mar 2008
Posts: 3,632
Likes: 150
C63s Cabriolet, BMW M4, Civic
It's cool if you like it. I'm not trying to make you stop using it. I just highly doubt you are saving much fuel or do much for the environment. If you wanna prove me wrong, drive one month with it off and one month with it on and compare the mpg, assuming you are willing to conduct a fair and consistent test.
As for saving the environment, try stand behind the car while it idling and tell me you don’t smell anything. Btw, this is just a discussion not an argument.
MBWorld Fanatic!
Joined: Mar 2008
Posts: 3,632
Likes: 150
C63s Cabriolet, BMW M4, Civic
Out Of Control!!
Joined: Nov 2018
Posts: 11,451
Likes: 5,352
From: San Francisco Bay Area
2019 C63CS
It just common sense. If your engine shut off 1-2 mins at the light times 5x per day. So you don’t think any fuel saving with 10 mins engine is off vs engine running?
As for saving the environment, try stand behind the car while it idling and tell me you don’t smell anything. Btw, this is just a discussion not an argument.
As for saving the environment, try stand behind the car while it idling and tell me you don’t smell anything. Btw, this is just a discussion not an argument.
Last edited by superswiss; Aug 2, 2021 at 11:01 PM.
MBWorld Fanatic!
Joined: Mar 2008
Posts: 3,632
Likes: 150
C63s Cabriolet, BMW M4, Civic
Yes, of course, but I'm not sure you realize how miniscule those savings are. An idling engine uses up to 0.5 gallons per hour, so that breaks down to 0.08 gallon in your 10 minutes, you wipe that out and then some the next time you rip it up an onramp, so I'm just not sure what we are discussing here with a V8 that gets 11 mpg in the city. It's simply a pointless exercise. You are not convincing anybody that you are concerned about the environment.
Out Of Control!!
Joined: Nov 2018
Posts: 11,451
Likes: 5,352
From: San Francisco Bay Area
2019 C63CS
Yes, I do know and it's very well documented. As I stated earlier, the drive cycles that are used to certify the mpg are a) very conservative, and b) involve a lot of stopping and idling for extended periods. About 50% of the cycle is idle time. Auto stop/start helps manufacturers to show favorable mpg during these artificial cycles, and the benefits for us is that we don't pay a gas guzzler tax on these cars, and we get S, S+ and Race modes that are far less fuel efficient as long as the car starts up in C. But even the WLTP cycle which is supposed to be closer to real world usage is not real world usage. I think we are all pretty aware that nobody really achieves the mpg that manufacturers state, or do you? I certainly don't. The drive cycles are so artificial that it was possible for VW to come up with their cheat devices and essentially recognize a test cycle as nobody really drives like that in the real world. But anyway, feel free to measure this in the real world and collect data to support your thesis that it makes a material difference. I'm all open for it. There are benefits for smaller more efficient engines and cars that are driven more economically. But unless you drive your C63 like a grandma, it's not gonna make a material difference. It's at best virtue signaling.
MBWorld Fanatic!
Joined: Mar 2008
Posts: 3,632
Likes: 150
C63s Cabriolet, BMW M4, Civic
MBWorld Fanatic!
Joined: Dec 2019
Posts: 1,511
Likes: 424
From: Florida
AMG C63s
Have you noticed how jerky the gliding is when shifting back in gear on highway? Kind of scary you glide out of gear at 90 mph and then when you hit the gas it jerks a little to back in gear. I never used that feature until recently by accident and will never use it again.
Out Of Control!!
Joined: Nov 2018
Posts: 11,451
Likes: 5,352
From: San Francisco Bay Area
2019 C63CS
Yeah, highway mileage is relatively easy to achieve, especially with the 9-speed in the FL. Interestingly, the FL no longer glides in Comfort mode. Have to use I* with Drive setting in Moderate or Reduced. Where it goes south is city and combined driving.
MBWorld Fanatic!
Joined: Mar 2008
Posts: 3,632
Likes: 150
C63s Cabriolet, BMW M4, Civic
Have you noticed how jerky the gliding is when shifting back in gear on highway? Kind of scary you glide out of gear at 90 mph and then when you hit the gas it jerks a little to back in gear. I never used that feature until recently by accident and will never use it again.
Last edited by Klinh; Aug 3, 2021 at 06:13 AM.
Member
Joined: Oct 2020
Posts: 124
Likes: 21
C63s
Interesting takes, I agree with a few points from each of you. I find the eco start stop to be very annoying at times, and nice at others. If I'm moving towards a light that turns red 100 feet in front of me, I really appreciate it. In some places lights are LONG (try getting stuck at a light that just turned red in vegas) 
. I appreciate the silence at times when it activates, our engines idle loudly-even when fully on the brakes. Conversely, it can be a real P.I.T.A. Pulling up to a stop sign?- engine stops. Pulling up to a red light that turns green the instant you stop?- engine is off. Possibly the worst part about those 2 situations is that there is then a lag between the engine restarting and the clutch engaging. Its enough to make taking off a rough jerk of an experience, or to leave you sitting still while people around you are going.
Glide mode I also have mixed feelings on.....
On long highway stretches it has the propensity to be useful, pretty annoying on city streets. I like it on long, rolling hilly highways (obviously), and it can certaibly be handy if cars are braking ahead of you. What i can't stand is when you come off of the gas for 0.25 seconds on the highway, and it pops into neutral. It upsets the car for nothing, and it can't possibly be good from a wear perspective. I guess what I really miss is having a manual trans, and being able to select neutral or any other gear non sequentially, on a whim. The best ecu is your brain- you know what gear you will need 200 feet ahead based on what you see. An ecu only knows what you're telling it right NOW.
. I appreciate the silence at times when it activates, our engines idle loudly-even when fully on the brakes. Conversely, it can be a real P.I.T.A. Pulling up to a stop sign?- engine stops. Pulling up to a red light that turns green the instant you stop?- engine is off. Possibly the worst part about those 2 situations is that there is then a lag between the engine restarting and the clutch engaging. Its enough to make taking off a rough jerk of an experience, or to leave you sitting still while people around you are going.Glide mode I also have mixed feelings on.....
On long highway stretches it has the propensity to be useful, pretty annoying on city streets. I like it on long, rolling hilly highways (obviously), and it can certaibly be handy if cars are braking ahead of you. What i can't stand is when you come off of the gas for 0.25 seconds on the highway, and it pops into neutral. It upsets the car for nothing, and it can't possibly be good from a wear perspective. I guess what I really miss is having a manual trans, and being able to select neutral or any other gear non sequentially, on a whim. The best ecu is your brain- you know what gear you will need 200 feet ahead based on what you see. An ecu only knows what you're telling it right NOW.
Member
Joined: Oct 2020
Posts: 124
Likes: 21
C63s
Back on topic-
Good info on cooling on this thread. Have had similar questions myself for a while now. In the past I made a point to turn off start/stop if my temps were on the higher end (>210F). I probably still will but good to know cooling is still occurring when the engine stops.
Good info on cooling on this thread. Have had similar questions myself for a while now. In the past I made a point to turn off start/stop if my temps were on the higher end (>210F). I probably still will but good to know cooling is still occurring when the engine stops.
Member
Joined: Jul 2021
Posts: 97
Likes: 14
C63S
I've heard the start/stop feature is automatically turned off once you get into Sport+ or Race mode, but are there other means to disable it permanently so it doesn't keep reengaging requiring a manual turn off? I hate auto start/stop and on an earlier 911 I had all that was required was a button to turn it off and it'd never turn itself back on unless you manually disengaged.
MBWorld Fanatic!
Joined: Nov 2004
Posts: 6,697
Likes: 382
2005 E55
