Does the 2016 C7 have the Start/Stop functionality?
Pro
Joined: Mar 2014
Posts: 631
Likes: 172
yup, the switch is called "last user mode" i.e. if you turn it off when you are running, it will not come back on - ever - unless you flip the switch back the other way. Simply, it remembers the mode you want when you start the car. Kinda like how you set sport driving mode.
if your wife gets in and turns it back on, it will stay on until switch is flipped again. The switch is part of the starter button pad.
if your wife gets in and turns it back on, it will stay on until switch is flipped again. The switch is part of the starter button pad.
Last edited by fumbling; Jan 31, 2016 at 12:42 PM.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 34,953
Likes: 12,364
From: NE South Carolina
What I find interesting is folks who complain have perhaps not driven the latest versions. As Glen notes if to cold or hot out or for a dozen other parameters the computer control doesn't active the system! When I take my foot off the brake when leaving a stop light the engine starts. If I have the Four Season's playing on the radio I can't tell!
Perhaps they consulted IBM's Watson and it figured out what folks like!!
PS: I can hear the grumbling now when the 2025 model Vette is announced with a 4 cylinder dual turbocharged engine with one turbo driving a generator to charge the hybrid drive battery! Excess available turbo power is a portion of what some Formula 1 cars use now to charge their KERS (Kinetic energy recover systems.) However expect when the 160 hp battery power kicks in on acceleration, like the current LaFerrari, it will put a smile on their face!
Last edited by JerryU; Jan 31, 2016 at 05:37 PM.
The Consigliere
Joined: May 2006
Posts: 22,993
Likes: 6,042
From: 2023 Z06 & 2010 ZR1
I agree. This place will explode when it happens. Will make fixed headlights and C7 tail end pale in comparison.
I'm humored by the reference to "vitriol" against this. I have no "vitriol" regarding this. When it comes to my engine turning on and shutting off, I simply want to be the thing/being that makes that decision. Others, it appears, look forward to the efficiency gains and nuttin' wrong with that.
Buy yeah, when they roll this out, it should make for some good comedy.
Race Director
Joined: Sep 2013
Posts: 11,825
Likes: 2,474
From: Ft Lauderdale
Tech Contributor
Mfrs learned early, you will affect sales if you can't turn it off......
Pro
Joined: Nov 2013
Posts: 630
Likes: 94
Porsche and MBZ have stop-start, too. It's coming, just a matter of when.
How much weight and complexity will it add? In particular, how much weight will it add to the turning mass of the engine?
I dunno.... but, can't see that it will degrade the performance of the car in any significant way. And, as others have noted, you will be able to turn it off.
How much weight and complexity will it add? In particular, how much weight will it add to the turning mass of the engine?
I dunno.... but, can't see that it will degrade the performance of the car in any significant way. And, as others have noted, you will be able to turn it off.
Drifting
Joined: Aug 2002
Posts: 1,452
Likes: 190
From: Zion NC
A few facts about this, in that I have used it pretty heavily.
Its generally okay. The car does not get too hot, and it does a good job of regulating the temperature. But, you can feel a change in the A/C as the car sits at a red light. It is nearly instantaneous startup when you take your foot off the brake.
Now for some opinion.
1. They either had to put a much more beefy starter in it, or be prepared to replace the starter eventually. If it is beefier, that's extra weight, but it is non rotational, and should only impact the performance by the extra weight of the starter motor.
2. I don't like the idea of the motor constantly shutting on and off. Irrespective of what anyone who is a proponent of this system will tell you, this does put more stress on parts. It does cause issues with differential heat, with uneven oil, etc.
Is your motor going to break down at 101k miles just after the warranty runs out. Who knows, but I highly doubt it. Manufacturers are not stupid, they have already figured the failure probabilities out, long before they started installing these things.
But, it will increase wear on your motor, battery, electrical system, oil system, brakes, everything over the life of your car. If you plan on keeping the car for 3 years and then upgrading or trading it in, who cares. If you plan to keep it for 20 years and put 350k miles on it, you may want to turn it off. Lastly, romping on the throttle a few times will likely be just as damaging and stressful as the start stop. Now being that the fuel pumps on the Z06 (and I assume the base c7) are mechanical, I have no idea how long they hold pressure when the car is shut off.
Its generally okay. The car does not get too hot, and it does a good job of regulating the temperature. But, you can feel a change in the A/C as the car sits at a red light. It is nearly instantaneous startup when you take your foot off the brake.
Now for some opinion.
1. They either had to put a much more beefy starter in it, or be prepared to replace the starter eventually. If it is beefier, that's extra weight, but it is non rotational, and should only impact the performance by the extra weight of the starter motor.
2. I don't like the idea of the motor constantly shutting on and off. Irrespective of what anyone who is a proponent of this system will tell you, this does put more stress on parts. It does cause issues with differential heat, with uneven oil, etc.
Is your motor going to break down at 101k miles just after the warranty runs out. Who knows, but I highly doubt it. Manufacturers are not stupid, they have already figured the failure probabilities out, long before they started installing these things.
But, it will increase wear on your motor, battery, electrical system, oil system, brakes, everything over the life of your car. If you plan on keeping the car for 3 years and then upgrading or trading it in, who cares. If you plan to keep it for 20 years and put 350k miles on it, you may want to turn it off. Lastly, romping on the throttle a few times will likely be just as damaging and stressful as the start stop. Now being that the fuel pumps on the Z06 (and I assume the base c7) are mechanical, I have no idea how long they hold pressure when the car is shut off.
Last edited by ElCid79; Jan 31, 2016 at 11:57 PM.
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Burning Brakes
Joined: Sep 2015
Posts: 954
Likes: 269
From: San Jose
Many here continue that drum beat with direct fuel injection.
Progress is complex, but it beats the chit out of the alternative I think, don't you?
Race Director
Joined: Aug 2010
Posts: 12,641
Likes: 464
From: Houston TX
it's not quite the same analogy to me...I prefer to be in control of when the vehicle's engine is running...
I do not consider the "start/stop" technology to be an advance in performance.
I do not consider the "start/stop" technology to be an advance in performance.
Last edited by Gary '09 C6; Feb 1, 2016 at 12:02 AM.
Burning Brakes
Joined: Sep 2015
Posts: 954
Likes: 269
From: San Jose
Burning Brakes
Joined: Sep 2015
Posts: 954
Likes: 269
From: San Jose
Drifting
Joined: Aug 2002
Posts: 1,452
Likes: 190
From: Zion NC
Pro
Joined: Feb 2012
Posts: 545
Likes: 85
Here is my concern: At some point EPA and/or CARB is going to note that CAGS, AFM, and potentially start/stop systems (all of which are CAFE-compliance driven) are easily disabled or overridden. They will conclude that this invalidates the CAFE certification numbers, and therefore claim that by allowing these technologies to be easily defeated, the OEM is in effect providing a defeat device as defined by the Clean Air Act. Even a hint of this will scare the OEMs into making these systems impossible to turn off and nearly impossible to disable. I hope I'm wrong.
HOOK-EM HORNS
Joined: Aug 2006
Posts: 3,517
Likes: 842
From: Port Aransas, Texas Tx
St. Jude Donor '08
Mine does not start instantly. It's takes a second for the fuel pressure to come up. I sometimes wounder if it's going to start. This would be a problem at stop lights.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 34,953
Likes: 12,364
From: NE South Carolina
Overnight that pressure would leak down and the engine is cold but not in a few minutes. The high fuel pressure is no doubt also maintained.
They also are using different starters with the demand placed upon it. Our new DI BMW literally starts instantly when I take my foot off of the brake. With the radio playing I don't even notice the difference!
Last edited by JerryU; Feb 1, 2016 at 07:49 AM.
Race Director
Joined: Jan 2005
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Likes: 4,257
From: NC
guys, they have this sorted out...they are not stupid. It's now been on BMW and Audi's for 4 years, no warranty problems or "hurting the engine". About 20 things have to be in play before it will allow engine to shut off, i.e. if it needs the heater or ac to maintain the temp you set, , it stays on, if your front wheels are turned, it won't, if the batt is low, it won't, if you are on a hill, it won't and so on...
Here are the BMW parametrs:
There are numerous vehicle parameters that are monitored as a part of the stop/start function to ensure the driving experience is not impacted. As many of the factors are not possible to monitor it may appear that the feature is not working. Reason why the stop/start may not shut down the engine include:
• The car is coasting (manual transmission)
• Brake vacuum reading is too low (manual transmission)
• Insufficient brake pedal pressure is being applied to hold the vehicle stationary (automatic transmission)
• Stopping on a hill/downhill with a 12% or greater gradient
• If the steering angle is more then 6 degrees
• If the steering wheel is still be moved after approximately one second of coming to a stop
• The system has not yet be activated by going over a speed of 5mph for automatics, 3mph for manuals since the last engine switch off
• If the gas pedal is being pressed (engine must be at idle speed only)
• You're coming to a stop from reverse
• The driver gets out of the car
• If Hill Decent Control (HDC) is activated
• If the engine is not up to temperature
• If the carbon canister is being purged
• if the grade of the fuel is too low for the engine
• Transmission adaptation is active (automatic transmission)
• The hydraulic pressure accumulator is not yet up to pressure (automatic transmission)
• Stop-and-go traffic - system is only activated by driving over 5mph for automatics, 3mph for manuals
• Batter charge is low
• Outside temperature is colder then 37.4 F / 3 C
• Outside temperature above 95 F / 35 C and the air conditioning system is on
• Fogging of the windshield is detected by the IHKA system
• Climate control system is on but passenger compartment has not yet reached desired temperature
• ABS system was used when coming to a stop
Alternatively the car may automatically restart outside the standard restart procedure if:
• The driver is moving the steering wheel
• The driver presses the gas pedal
• The transmission was shifted from D to P and subsequently back to D
• The transmission is shifted to N or R
• The battery charge runs low
• Outside temperature rises above 95 F / 35 C and the air conditioning is on
• Fogging of the windshield is detected by the IKHA system
• Low evaporator temperature is detected
Here are the BMW parametrs:
There are numerous vehicle parameters that are monitored as a part of the stop/start function to ensure the driving experience is not impacted. As many of the factors are not possible to monitor it may appear that the feature is not working. Reason why the stop/start may not shut down the engine include:
• The car is coasting (manual transmission)
• Brake vacuum reading is too low (manual transmission)
• Insufficient brake pedal pressure is being applied to hold the vehicle stationary (automatic transmission)
• Stopping on a hill/downhill with a 12% or greater gradient
• If the steering angle is more then 6 degrees
• If the steering wheel is still be moved after approximately one second of coming to a stop
• The system has not yet be activated by going over a speed of 5mph for automatics, 3mph for manuals since the last engine switch off
• If the gas pedal is being pressed (engine must be at idle speed only)
• You're coming to a stop from reverse
• The driver gets out of the car
• If Hill Decent Control (HDC) is activated
• If the engine is not up to temperature
• If the carbon canister is being purged
• if the grade of the fuel is too low for the engine
• Transmission adaptation is active (automatic transmission)
• The hydraulic pressure accumulator is not yet up to pressure (automatic transmission)
• Stop-and-go traffic - system is only activated by driving over 5mph for automatics, 3mph for manuals
• Batter charge is low
• Outside temperature is colder then 37.4 F / 3 C
• Outside temperature above 95 F / 35 C and the air conditioning system is on
• Fogging of the windshield is detected by the IHKA system
• Climate control system is on but passenger compartment has not yet reached desired temperature
• ABS system was used when coming to a stop
Alternatively the car may automatically restart outside the standard restart procedure if:
• The driver is moving the steering wheel
• The driver presses the gas pedal
• The transmission was shifted from D to P and subsequently back to D
• The transmission is shifted to N or R
• The battery charge runs low
• Outside temperature rises above 95 F / 35 C and the air conditioning is on
• Fogging of the windshield is detected by the IKHA system
• Low evaporator temperature is detected
I do wonder if it is possible to implement stop/start with Displacement on Demand....
Jimmy
Last edited by jimmyb; Feb 1, 2016 at 10:24 AM.