Why auto start stop only lasts for 20 seconds?
The auto start stop function of my 2017 macan can only last for around 20s. before it forces itself to start again. I notice the battery voltage is around 12.3-12.4v before I first start the car every day. Could it be the low voltage of the battery that prevents the function from working properly?
Low battery, a/c on, slight steering angle....all will affect the stop / start function, and yes, all linked to battery capacity.
(...hateful invention; 1st thing I turn off every time I get in the car )
(...hateful invention; 1st thing I turn off every time I get in the car )
1st Sapphire SD
2nd Sapphire GTS
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Current 992 S Cab
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2nd Sapphire GTS
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Current 992 S Cab
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With auto stop/start disabled, note that you also lose the coasting function, so there will be a double whammy on fuel consumption.
Current: 2022 Macan S http://www.porsche-code.com/PP4FF9A4
Sold: 2019 Macan S
Sold: 2016 Macan 2.0
Sold: 2011 Cayman
Sold: 2019 Macan S
Sold: 2016 Macan 2.0
Sold: 2011 Cayman
^^
Agreed (if there is any meaningful economy with stop/start,) but I had the diamond button programmed to enable glide when on a run.
Agreed (if there is any meaningful economy with stop/start,) but I had the diamond button programmed to enable glide when on a run.
1st Sapphire SD
2nd Sapphire GTS
viewtopic.php?f=23&t=4296
Current 992 S Cab
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2nd Sapphire GTS
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Current 992 S Cab
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One of the signs that battery voltage is down is coasting being disabled. I'm not too sure about the effect on fuel consumption. If your foot is off the throttle, is the engine still using fuel until it drops to idle? Even if the answer is no, fuel usage must be minimal.
Peter
Current: 2020 Carmine Red GTS http://www.porsche-code.com/PMST9ZI9
Gone- 2015 Sapphire Blue Diesel
Gone -2013 Cayenne Diesel
Current: 2020 Carmine Red GTS http://www.porsche-code.com/PMST9ZI9
Gone- 2015 Sapphire Blue Diesel
Gone -2013 Cayenne Diesel
Iโm no expert () but Iโve often wondered....glide mode disconnects the drive so some fuel must go through to keep the engine on idle.
In drive, with no throttle applied, the engine keeps turning as it's still connected to the wheels but no throttle should stop fuel flow?
(Someone will probably know the answer)
In drive, with no throttle applied, the engine keeps turning as it's still connected to the wheels but no throttle should stop fuel flow?
(Someone will probably know the answer)
1st Sapphire SD
2nd Sapphire GTS
viewtopic.php?f=23&t=4296
Current 992 S Cab
viewtopic.php?f=23&t=9845&p=196465#p196465
2nd Sapphire GTS
viewtopic.php?f=23&t=4296
Current 992 S Cab
viewtopic.php?f=23&t=9845&p=196465#p196465
Personally, have long wondered what the ACTUAL gain in terms of fuel economy is with auto stop/start enabled, therefore inc. coasting, when comparing two absolutely identical journeys. Meaning one with it enabled, the other with it disabled. Assuming optimal condition of battery and weather exactly the same on both occasions. Obviously total saving is entirely dependent on number of stops and amount of coasting but, all things considered,
has anyone done any real-world comparisons and calculations?
It must be pretty negligible, I would imagine, in %age terms, but maybe worthwhile if doing a lot of journeys which involve 'the right' conditions.
has anyone done any real-world comparisons and calculations?
It must be pretty negligible, I would imagine, in %age terms, but maybe worthwhile if doing a lot of journeys which involve 'the right' conditions.
Macan S, MY16 64k mls, dechromed, PASM, BiXenons, PDLS+, heated 18way sports hardbacks, 20" SportDesign rims/PZeroNeros.
Ex:
Alfa Brera S Prodrive
Porsche 911 C4 factory-lowered(M033)
Porsche968 Sport
Audi S4 quattro Avant biturbo
325iTouring, 528SE
Ex:
Alfa Brera S Prodrive
Porsche 911 C4 factory-lowered(M033)
Porsche968 Sport
Audi S4 quattro Avant biturbo
325iTouring, 528SE
Worth noting that for stop/start functions to exist, they already enlarged the battery and fitted additional re-gen functions. This allows them to comply with emissions testing and official CO2/economy figures. Testing is done from a full battery and stop/start optimised to kick in during those test conditions. Mnfrs don't care how efficient it is outside of official testing but it's likely that stop/start is worth using once you've gone to the effort of fitting all the extra kit needed. I'm not a big fan though and generally drive in Sport where it's intentionally disabled.
Taking your foot off the throttle usually cuts off fuel supply completely on an injection engine, as said above, the engine keeps turning due to drive from the wheels. The fuel cut off is what can cause nice pops & bangs from the exhaust when you open/close the throttle.
With coasting, you're right, the engine still needs to run...or does it? As soon as you come back on the throttle it can jump start itself from your momentum. Never come across this one before, so don't know the answer. Will find out.
We didn't buy these cars for economy though, did we?
Taking your foot off the throttle usually cuts off fuel supply completely on an injection engine, as said above, the engine keeps turning due to drive from the wheels. The fuel cut off is what can cause nice pops & bangs from the exhaust when you open/close the throttle.
With coasting, you're right, the engine still needs to run...or does it? As soon as you come back on the throttle it can jump start itself from your momentum. Never come across this one before, so don't know the answer. Will find out.
We didn't buy these cars for economy though, did we?
---
2018 Macan Turbo Exclusive Performance Edition with all the trimmings
viewtopic.php?f=23&t=10070
2018 Macan Turbo Exclusive Performance Edition with all the trimmings
viewtopic.php?f=23&t=10070
If it fires up as you stated without the a/c on or any other intervention by yourself (i.e touch/move controls) definitely battery, if you have a battery conditioner just leave it on for some time to bring it back to full charge state.tomyin67 wrote: โFri Aug 21, 2020 2:29 pm The auto start stop function of my 2017 macan can only last for around 20s. before it forces itself to start again. I notice the battery voltage is around 12.3-12.4v before I first start the car every day. Could it be the low voltage of the battery that prevents the function from working properly?
Previous Porscheโs
2008. 987 Boxster S Sport basalt
2012. 991 Carrera S aqua
2016. Macan Turbo volcano
2020. Macan GTS crayon (sold 04/24)
Awaiting delivery
2024. Macan GTS gentian. mid May https://configurator.porsche.com/porsche-code/PR8H7WC6
2008. 987 Boxster S Sport basalt
2012. 991 Carrera S aqua
2016. Macan Turbo volcano
2020. Macan GTS crayon (sold 04/24)
Awaiting delivery
2024. Macan GTS gentian. mid May https://configurator.porsche.com/porsche-code/PR8H7WC6
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