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Stop/Start systems - any good ?

  • 14-05-2010 1:50pm
    #1
    opinion guy
    Closed Accounts Posts: 11,001 ✭✭✭✭


    Been looking at some cars lately and the new models have these stop start systems. ie. when you stop at lights and put ont he handbrake the car turns off. when you depress the clutch it starts again. but all the car salesmen are saying it doesn't make any difference. Which begs the question why would the car companies spend money on the R&d to implement this and the cost or extra electronics into every car, if it doesn't make much difference ?

    Does this system really make much difference to fuel consumption ?


Comments

  • #2
    Mr Benevolent
    Closed Accounts Posts: 12,456 ✭✭✭✭Mr Benevolent


    opinion guy wrote: »
    Been looking at some cars lately and the new models have these stop start systems. ie. when you stop at lights and put ont he handbrake the car turns off. when you depress the clutch it starts again. but all the car salesmen are saying it doesn't make any difference. Which begs the question why would the car companies spend money on the R&d to implement this and the cost or extra electronics into every car, if it doesn't make much difference ?

    Does this system really make much difference to fuel consumption ?

    In heavy traffic it will - 0mpg is bad. It's more to reduce CO2 emissions though.


  • #3
    colm_mcm
    Registered Users, Registered Users 2 Posts: 73,520 ✭✭✭✭colm_mcm


    Had it on an Urban Cruiser last year, it has a timer that tells you long the car is in stop mode for - you can reset the same as a trip meter. Over 2 months it had been in stop mode for an hour and a half.

    It probably reduces consumption on the set cycle they use for determining CO2 levels for taxation reasons. car companies engineer their cars to achieve certain figures, the same way as they engineer the cars to do well in the NCAP test. i.e these seemingly are the only criteria they use.


  • #4
    Owen
    Registered Users, Registered Users 2 Posts: 12,683 ✭✭✭✭Owen


    I seem to remember looking at how much the stop start system contributed to the entire BMW efficient dynamics package ... think it was something tiny, like .7% overall - the majority of savings were due to low drag, lightweight panels, clever fuel injection, low rolling resistance tyres.


  • #5
    rebel.ranter
    Registered Users, Registered Users 2 Posts: 3,570 ✭✭✭rebel.ranter


    As others have said if it is only to bring the car into a lower CO2 bracket then if I had the system & it could be turned off I'd turn it off, especially if it only contributed a 0.7% saving.
    I would just be thinking of the extra repair bills associated with all that start/stopping like the premature starter motor wear.


  • #6
    CJhaughey
    Registered Users, Registered Users 2 Posts: 14,907 ✭✭✭✭CJhaughey


    VW had this type of system on the MkII Golf a long time ago, wasn't any good then and probably isn't any better now.
    More wear and tear on batteries/starters/ and solenoids.
    Better for Manufacturers part sales though....


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  • #7
    Guy:Incognito
    Registered Users, Registered Users 2 Posts: 38,247 ✭✭✭✭Guy:Incognito


    Slightly OT but do these cars actually turn off then have to fully start up again? I'd imagine it'd burn through starter motors at a much higher rate than a normal car , no? Plus, could you not potentially run down a battery on heavy traffic?


  • #8
    langdang
    Closed Accounts Posts: 3,857 ✭✭✭langdang


    Stekelly wrote: »
    Plus, could you not potentially run down a battery on heavy traffic?
    BMW have Intelligent Battery Sensor to prevent this happening (amongst other reasons)


  • #9
    colm_mcm
    Registered Users, Registered Users 2 Posts: 73,520 ✭✭✭✭colm_mcm


    AFAIK the one on the Toyota 1.33 is an alternator and starter in one and is massive.

    The car would start instantly when you touch the clutch, it was also pretty clever about when it wouldn't turn the car off (when you had the heater or A/C on full blast or if you were stopping/starting loads, when the engine was cold) you could also switch the system off manually (every time you start the car


  • #10
    opinion guy
    Closed Accounts Posts: 11,001 ✭✭✭✭opinion guy


    Stekelly wrote: »
    Slightly OT but do these cars actually turn off then have to fully start up again? I'd imagine it'd burn through starter motors at a much higher rate than a normal car , no? Plus, could you not potentially run down a battery on heavy traffic?

    Yeah they fully stop and then restart. But only in certain conditions - i.e. when the engine is up to operating temp, you don't have the window heater on etc etc. Sales dude was saying how they had to develop new more reliable starter motors etc to make it work. Even restarted the car when i stalled it !!!:eek:

    I guess it depends on your driving. Probably save a dublin taxi driver alot but not do much for the salesman travelling all over the country


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