Notices
 
 

  

User Tag List

Thread: Audi stop-start facility

Page 1 of 3 123 LastLast
Results 1 to 10 of 26
  1. Audi stop-start facility 
    #1
    Join Date
    Apr 2013
    Location
    Auchterarder, Scotland
    Posts
    15
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)
    I am interested in the views of others into the default setting where the engine stops automatically and starts again when clutch is depressed and gear engaged. I switch off this facility as it seems strange to have the starter motor operating so often in heavy traffic. I am also uncertain as to its overall effect on reducing emissions. I welcome comments on this from those who also have this facility and whether or not they favour its use.

    Cheers

    David
     
    0 0 0
     

  2. Re: Audi stop-start facility 
    #2
    Join Date
    Apr 2009
    Location
    Surrey
    Posts
    2,785
    Post Thanks / Like
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    182 Post(s)
    Quote Originally Posted by fiddler3 View Post
    I am interested in the views of others into the default setting where the engine stops automatically and starts again when clutch is depressed and gear engaged. I switch off this facility as it seems strange to have the starter motor operating so often in heavy traffic. I am also uncertain as to its overall effect on reducing emissions. I welcome comments on this from those who also have this facility and whether or not they favour its use.

    Cheers

    David
    Use it all the time and have no problems with it all. In a recent Autocar longterm test, one of the cars they had (think it was a Kia o Hyundai) actually recorded the amount of time the engine was off with Stop/Start system. If I recall correctly over the 12 month period they had the car the engine was off for something close to 24 hours. Think how much fuel you would burn leaving the car to idle for 24 hours and I think it is pretty certain the system is saving both fuel and reducing emissions. Also look at the fuel consumption on the DIS drop as the car is sitting in traffic. Some will say that it burns more fuel to restart the car, but as it only operates when the engine is at a reasonable temperature this is not a real issue. Find it strange driving other cars that do not have it available
     
    0 0 0
     

  3. Re: Audi stop-start facility 
    #3
    Join Date
    May 2010
    Location
    Scotland
    Posts
    90
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)
    I'm on my second car with the system.

    I was nervous / concerned about it before hand but ended up having no issues at all with the first car (BMW) and so far no problems with the A6 either.

    My understanding is that the car systems are designed around the increased duty cycle and that many clever things go in the background to 'park' the engine allowing for minimal fueling on a restart.

    All in all I don't even notice it anymore, it's second nature. I'm only reminded of it whe I have passengers who are not used to such a system and get concerned that the engine has suddenly cut out...

    I have no science to back up emissions / mpg figures but it seems logical to me that the engine being switched off whilst not in use is far preferable to it being on and burning fuel.

    In a few years time we'll all have cylinder deactivation common place as well I imagine!
     
    0 0 0
     

  4. Re: Audi stop-start facility 
    #4
    Join Date
    Jul 2009
    Location
    Renfrewshire
    Posts
    65
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)
    How does this effect the turbine in the Turbo? this beast is spinning at about 20,000 RPM engine, engine stops and (oil pump is engine driven I take it) no oil feed to compressor/turbine bearings. Imagine busy period and car stopping and starting in heavy traffic how does lubrication feed turbine bearings...........Learned in merchant navy that you never stop a turbo diesel on full load but bring it down slowly to idle before stopping.
    I always disable stop start due to this problem.
     
    0 0 0
     

  5. Re: Audi stop-start facility 
    #5
    Join Date
    Nov 2009
    Location
    UK
    Posts
    23,541
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    1 Thread(s)
    Quoted
    46 Post(s)
    Quote Originally Posted by harryg View Post
    How does this effect the turbine in the Turbo? this beast is spinning at about 20,000 RPM engine, engine stops and (oil pump is engine driven I take it) no oil feed to compressor/turbine bearings. Imagine busy period and car stopping and starting in heavy traffic how does lubrication feed turbine bearings...........Learned in merchant navy that you never stop a turbo diesel on full load but bring it down slowly to idle before stopping.
    I always disable stop start due to this problem.
    I think the engineers at Audi have took into consideration the turbo and starter and the car probably have fail-safes should the car be stuck in traffic etc and there is constant on and off. If SS was going to cause damage to the turbo then no-one would use SS and wouldn't be invented?
     
    0 0 0
     

  6. Re: Audi stop-start facility 
    #6
    Join Date
    May 2010
    Location
    Scotland
    Posts
    90
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)
    I suspect the oil pump is electric. And / or turbos likely water cooled as well?

    The problem you describe would also require you to idle the car at the end of a journey to let the turbo cool. Perhaps on a highly modified and high strung performance engine but otherwise that shouldn't be necessary in a modern car.

    These were all concerns I had as well but I came to the conclusion :

    - The info that's out there on some of the systems answers the questions.

    - Ultimately there's no way they'd manufacture a car with that inherent an issue. If I can identify it as a problem then engine engineers who are 1000x smarter than me have fixed it before breakfast.

    - Stop / start isn't a binary function. The car will only shut off if any number of parameters are within tolerance. I can well imagine this includes temperature / pressures in the cooling system for the engine and turbo.

    Of course the other question you should ask is that if all the turbo etc components have been designed to have a shorter overall lifespan as it's assumed they will not be in service as much due to stop start. Therefore by disabling the system you're causing greater than designed wear. I think I'm joking...
     
    0 0 0
     

  7. Re: Audi stop-start facility 
    #7
    Join Date
    Oct 2008
    Location
    Pembrokeshire
    Posts
    13,118
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    22 Post(s)
    the turbo is fed oil from the engines oil pump which is driven by the engine so indeed when the engine stops oil stops as well. a turbo will spin at speeds in excess of 200,000 rpm ( yes, two hundred thousand) when going flat out. you should indeed let a turbo'd engine idle before shutting it down after using the turbo. in traffic you are not using the turbo so no need to idle as the engine is only really on or just above idle. the problem is not the speed or the turbo though but the heat it generates. if the unit is glowing cherry red and you switch the engine off, the oil in the turbo burns and forms carbon. do this too many times and say goodbye to your bearings. so if you have been ragging it then hit traffic its not good if the ss turns the engine off. but for most everyday driving it won't cause a problem. how many people don't treat a turbo properly anyway and have them blow in 50k miles ?
    Audi 80 tdi avant with 360,000 miles...
     
    0 0 0
     

  8. Re: Audi stop-start facility 
    #8
    Join Date
    Nov 2009
    Location
    Stratford upon Avon UK
    Posts
    1,133
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    36 Post(s)
    I can see how S/s works in cities or in a queue on the motorway but it drives me nuts when I drive around the country lanes that surround me. It is a pain in the whatsit when you arrive at a T junction and all is clear so you put your foot down just as the engine stops. I turn it of as a matter of course.. part of my heading out of the driveway ritual.
    Plus I do wonder about wear and tear on batteries and starter motors...
     
    0 1 0
     

  9. Re: Audi stop-start facility 
    #9
    Join Date
    Oct 2008
    Location
    Pembrokeshire
    Posts
    13,118
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    22 Post(s)
    oh man, that must be soooo annoying then in the country. as you say its fine for where it was intended, the city. i wonder how long before accidents are caused by it.
    Audi 80 tdi avant with 360,000 miles...
     
    0 0 0
     

  10. Re: Audi stop-start facility 
    #10
    Join Date
    Nov 2009
    Location
    Stratford upon Avon UK
    Posts
    1,133
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    36 Post(s)
    YUP... and it is one of the few "settings" that the car does not remember between start-ups...
    It's a lovely (REALLY lovely) car but there are a few technology decisions that Audi made that may not be aligned with the desires of their customers.. I suspect the s/s one may be policy driven from the perspective of gaining specific fuel consumption ratings.
     
    0 0 0
     

Page 1 of 3 123 LastLast

Similar Threads

  1. Audi A3 start stop issue
    By abz1981 in forum Audi A3 - 8P - 2004 - 2012
    Replies: 2
    Last Post: 10-12-2012, 11:35 PM
  2. How does Start/Stop interplay with Stop-Go on the ACC?
    By Timothy Nathan in forum Audi A6 - C7 Forum - 2011- 2018
    Replies: 7
    Last Post: 09-02-2012, 11:40 AM
  3. Please Help audi diesel start stop since crash
    By crane in forum 80 - 90
    Replies: 1
    Last Post: 15-09-2010, 12:45 PM
  4. Start Stop
    By Tony2 in forum Audi A4 - B8 Forum - 2008 - 2015
    Replies: 5
    Last Post: 22-03-2010, 09:32 AM
  5. Audi Starts With Stop-Start Technology
    By Bristle Hound in forum Audi A4 - B8 Forum - 2008 - 2015
    Replies: 0
    Last Post: 06-03-2009, 07:03 PM
Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


 



  


Disclaimer: VW Audi Forum is an "independant enthusiast website", administered in line with guidelines supplied by VAG in the UK, and is in no way related to any of the Worldwide Volkswagen,Audi,Seat,Skoda,Bentley,Bugatti,Porsche or Lamborghini group of Companies. For official up to date information on any of there vehicles, please visit the official websites. Any comments made throughout this website, are the views of the respective poster, and in no way represent the views of the VW Audi Forum Administration, or the worldwide Volkswagen & Audi Group of companies.


VW Audi Forum do not vet and are not responsible for any information which is posted in this forum. All content is viewed and used by you at your own risk and we do not warrant the accuracy or reliability of any of the information.


Copyright: Certain "words", "phrases" and "Images" used on this website by the Administration are "Copyright" of Volkswagen GB, Volkswagen AG (Germany), Audi GB, Audi AG (Germany), Volkswagen Motorsport GB, Volkswagen Motorsport AG (Germany), Audi Motorsport AG (Germany), Volkswagen Racing GB, Bentley, Bugatti, Porsche and Lamborghini. No image can be replicated by anyone WITHOUT the relevant Companies written permission.


All trademarks and copyrights remain property of their respective owners.

No part of the VW Audi Forum website or forum may be reproduced without written permission from the site administration


PLEASE NOTE - PERSONAL ABUSE, ABUSE AGAINST THIS OR ANY OTHER WEBSITE OR ANY COMPANY WILL NOT BE TOLERATED. OFFENDERS WILL BE MODERATED OR EVEN BANNED.


This website and forum are best viewed at a minimum resolution of 1024 by 768.



  



- VW AUDI Forum - The #1 Volkswagen (VW) Group Forum - Volkswagen (VW) - Audi - Seat - Skoda - Bentley - Bugatti - Lamborghini - Porsche - Scania - MAN - Ducatti - VW Audi Forum -


- www.vwaudiforum.co.uk - www.vwaudiforum.co.uk -