Any - Stop / Start Systems - Cyd

This post came about as the result of a direct question elsewhere on the forum. I was asked specifically what I thought the effect of s/s was on engine life. But this set me off on something of a rant about how s/s had come into being as well as it's effects on the cars mechanical systems (and not-so-mechanical driver). After a bit of editing, I came up with this.

Of course, do bear in mind that this is about stop/start in internal combustion (IC) engined cars. BEVs (battery electric vehicles) will have a 'natural' stop/start sytem in built by the fact that you stop a motor by cutting the power supply !!

Also, this is my view as an Enginner in the Automotive Industry. I understand how OEs react and resolve issues brought about by legislation. It's what I do. Anyway, enjoy and I hop you find it useful.

****************************************************

They are a triumph of marketing (driven by market forces) over engineering. And it's "our own" faults

Here in the UK, despite the fact that VED is a drop in the ocean compared to the total cost of running a car, the level of VED any particular car attracts has a massively disproportionate effect on percieved value in the market place and hence on sales. People will moan like Bill about VED levels, yet never a murmour about depreciation!

Now, the Government knows this. It also desires to reduce pollution levels caused by burning fuel. So it decides to manipulate market forces by setting a VED regime that cajoles consumers into smaller more efficient cars, which in turn cajoles manufacturers to make more efficient cars. It uses CO2 as the measure to provide a percieved link between pollution and the size of your car. It's phsycological warfare - trying to shame you into a smaller engined car.

The automotive industry then sets about creating Engineering solutions to this new marketing need. Many of the solutions are excellent: smaller capacity turbo engines; improved aerodynamics; reduced vehicle weight; more efficient engines; fuel cut off on overrun and so on.

At least one solution isn't so good (well, further down the ownership line that is); automated manual dual clutch gearboxes.

However, there is still a problem. In congestion, no matter how small and efficient ythe engine, it still burns fuel whilst idling and going nowhere, increasing local pollution levels. So the mandated test regime for determining CO2 output includes a simulated drive cycle which in turn includes a period of idling. There is nothing in the test rules that says the engine MUST remain running during the idling portion of the test and so some bright spark somewhere spots that the total test CO2 output can be cut by stopping the engine during this portion of the test.

Now this doesn't achieve much in reality, maybe 5 or 10 grams overall, but this is enough in some cases to drop a car into the next VED band down. So, voila, a marketing advantage is born and suddenly cars have stop start fitted. Boom!

This brings it's own challenge. It stresses the cars starting system. So it gets beefed up. By just enough to keep warranty at bay whilst not eroding the marketing advantage by adding too much cost or weight.

The cars showroom appeal is improved by it's "percieved" economy and reduced VED.

Boom! Hoisted by our own petard! Our en-mass gullibility exploited to the max!

Stop/start is a disaster for the longevity of engines and systems. It stresses so many components, including the driver.

***********************************************************

Just a little something to add to the above:

I've been asked why Dealers cannot program s/s out, so it's never operable anymore. That's simple. The CO2 output test regime is a legal requirement. The cars sold in dealers MUST be as tested. It would therefore be illegal for a dealer to "reprogram" a car to defeat the system since it's CO2 output would be made worse. This is probably why no aftermarket tuners offer this service either.

Some (but not all) cars have an 'off' switch you can press at each engine start. Bearing in mind the above, be thankful if your car has this facility.

Stop/start is also one of the root causes of one of the worst driving techniques on our roads today. The 'habit' of sitting at junctions with foot on brake blinding the driver behind with your brake lights. Instead of putting car into neutral with handbrake on, like you was taught to do for your test!!!!

Any - Stop / Start Systems - badbusdriver

Your last point strikes a nerve with me as it is exactly why i tend not to use the SS on our honda jazz CVT. I hate sitting behind someone who's brake lights are on, so i would go out of my way to avoid doing so myself. Because our car is the CVT, i can avoid the SS by simply slipping the car into neutral, which, unless i know the lights are about to change, is what i do. It's not that i have anything against SS in principal, but unless a better system cn be worked out, i will just continue to avoid it. One other thing, and i don't know if this is the same with all cars (at least automatic cars), and that is, if i press the brake pedal just enough to hold the car, it won't switch off.

Any - Stop / Start Systems - bolt

I have ss on the civic but never have used it, I allways turn it off after starting the engine, as for not using the handbrake, only times I do not use it is when stopped for just a couple of seconds

any longer and the handbrake is applied, since my test going back a long time,using it is a habit

Any - Stop / Start Systems - efad2

Spot on Cyd

I hate my ss and the first thing I do is turn it off

When stopped for more than a few seconds its handbrake on and into neutral

Any - Stop / Start Systems - Theophilus

However, there is still a problem. In congestion, no matter how small and efficient the engine, it still burns fuel whilst idling and going nowhere, increasing local pollution levels. So the mandated test regime for determining CO2 output includes a simulated drive cycle which in turn includes a period of idling. There is nothing in the test rules that says the engine MUST remain running during the idling portion of the test and so some bright spark somewhere spots that the total test CO2 output can be cut by stopping the engine during this portion of the test.

This is precisely why it is anti-social to disable stop-start! The amount of CO2 emitted by a single vehicle when idling is very low, but for those living in cities alongside busy roads the cumulative effect of reducing CO2 by only a small degree for each car idling alongside one's home adds up to significant pollution. Surely if motorists are to avoid being seen as selfish polluters by government and local councils we should welcome any innovations which impact on the environment (and I have never voted "Green"!!)

Any - Stop / Start Systems - nellyjak

En-mass gullibilty.?...'twas ever thus...that's why we have so many diseasel cars on the road today....though i have never added to that number as I'm a true old skool PETROLhead.!

Any - Stop / Start Systems - bolt

En-mass gullibilty.?...'twas ever thus...that's why we have so many diseasel cars on the road today....though i have never added to that number as I'm a true old skool PETROLhead.!

I do wish some people would stop calling others gullible, some cars have SS whether you want it or not, so its not gullibility, its like it or dont buy it.. as far as diesels are concerned you have a choice- which you made, but dont complain about those that have bought diesel, its annoying

Any - Stop / Start Systems - concrete

En-mass gullibilty.?...'twas ever thus...that's why we have so many diseasel cars on the road today....though i have never added to that number as I'm a true old skool PETROLhead.!

I do wish some people would stop calling others gullible, some cars have SS whether you want it or not, so its not gullibility, its like it or dont buy it.. as far as diesels are concerned you have a choice- which you made, but dont complain about those that have bought diesel, its annoying

Well said bolt. I would like to nellyjak tow my caravan or trailer with his petrol vehicle. It may do it would not do it as easily and effortleely as a diesel. Horses for courses. It is not very helpful to catigate someone for choosing a vehicle that suits their circumstances.

Cheers Concrete

Any - Stop / Start Systems - barney100

My car has Stop/Start and I hate it with a vegeance. Luckily I can knock it off when first starting up, like the post said they won't disable it at the dealers.

Any - Stop / Start Systems - gordonbennet

Another valuable common sense lesson in how to make your car last as long as possible, many thanks Cyd.

You carry on like this they'll be spiriting you away in the dead of night for re-education.:-)

Any - Stop / Start Systems - Andrew-T

My car has Stop/Start and I hate it with a vegeance. Luckily I can knock it off when first starting up, like the post said they won't disable it at the dealers.

None of my cars is new enough to have stop/start. If I know I am at a traffic light that takes a long time to change, I may well switch off manually.

Any - Stop / Start Systems - kiss (keep it simple)

A friend recently told me that his wife defeats the SS system by keeping her foot on the clutch to stop it functioning. I wonder how many thrust bearings fill fail just out of warranty.

Any - Stop / Start Systems - primus 1

erm.... I quite like s/s, and never switch mine off, I always put into neutral with handbrake on, I was going to post a thread about lazy drivers who sit with their foot on the brake and being dazzled, but I guess I know why they do it..

Any - Stop / Start Systems - NARU

erm.... I quite like s/s, and never switch mine off, I always put into neutral with handbrake on, I was going to post a thread about lazy drivers who sit with their foot on the brake and being dazzled, but I guess I know why they do it..

It may not be quite what you think.

My car has 'autohold'. When I come to a stop (eg. at the traffic lights), the footbrake remains on automatically. I can take my foot off the pedal completely without the car moving. When I move away, the brakes automatically release.

Much easier than using a handbrake, but it does mean that the brake lights are illuminated all the time I'm stopped.

Any - Stop / Start Systems - Engineer Andy

When I was test-driving a Mazda3 and CX-3 early in the year (I didn't change my car in the end, for other reasons than these cars weren't any good) I was told that the start-stop systems on their cars can be switched off by a button, but the system resets itself back to 'default on' every time the car is switched off, then on again. It can't be 'permanently' (i.e. until the driver turns it on again) switched off, which is a shame, but I suppose people would then argue why the system was on their cars in the first place if most people didn't use them - a daft sop to the environmentalists.

A bit of a pain (especially for people like me with a bad memory), but at least you don't have to keep your foot on the brake or clutch (which I think would also do the same job).

Any - Stop / Start Systems - RT

When I was test-driving a Mazda3 and CX-3 early in the year (I didn't change my car in the end, for other reasons than these cars weren't any good) I was told that the start-stop systems on their cars can be switched off by a button, but the system resets itself back to 'default on' every time the car is switched off, then on again. It can't be 'permanently' (i.e. until the driver turns it on again) switched off, which is a shame, but I suppose people would then argue why the system was on their cars in the first place if most people didn't use them - a daft sop to the environmentalists.

A bit of a pain (especially for people like me with a bad memory), but at least you don't have to keep your foot on the brake or clutch (which I think would also do the same job).

Generally, Euro 5 cars with S/S could have it defaulting to off - Euro 6 cars must default to on if that's how their emissions were tested. The better diagnostic kits can usually change it though (winking smilie)

Any - Stop / Start Systems - Dogfuzz

Aha--now I know why there are stupid queues at green traffic lights--whilst stop/start engines "kick" in?

Any - Stop / Start Systems - FP

Pretty much instant response on mine - press the clutch and move away as you release. Before the clutch reaches biting point the engine is running and power available.

Is it just me, or are a lot of people on here out to bash stop-start?

Any - Stop / Start Systems - RickyBoy

Not out to 'bash-it' FP. I simply find it annoying – can't really say why.

I really don't like sprouts either but have no intention of going on a crusade to get them banned!

It's the same with electromechanical parking brakes. My Audi has one, I'd prefer it didn't, but, as mentioned earlier, I enjoy so many other aspects of the vehicle that I put up with it.

I dind't ask for/don't really require these 'innovations', and could certainly live without them, but as they're an unavoidable part of the overall I accept them and carry on regardless.

I experienced no trouble whatsoever with any aspect of the engineering (advances?) on my Sportback SE during my three years, one month of ownership. Maybe I was lucky? So much so that I have a new S-Line on order for March 2018. I hope/trust it will treat me just as well as the SE did!

I also run a two-year old Hyundai i10 Premium. Absolutely lovely little motor for zipping around town on weekdays, but, whenever you put the key in the ignition say to move it around on the drive (which I do for cleaning, etc.) it constantly 'pings' at you until you take the key out or get in and start it up! Drives me nuts... but that's the only thing that does. I'd definitely have another of those, say in a year or two's time, although I read earlier today that the new Polo is out in Jan '18 and a new A1 in Winter '19, so who knows?

There are certain aspects of Mrs RB that also annoy me (and me her no doubt), but the overall package has performed well over the years... :–)

Any - Stop / Start Systems - Avant

"So much so that I have a new S-Line on order for March 2018. I hope/trust it will treat me just as well as the SE did!"

I'm sure it will, although if you haven't deselected the sports suspension you'll be in for, literally, a nasty jolt.

Any - Stop / Start Systems - RickyBoy

...indeed I did Avant!...

Any - Stop / Start Systems - RT

Pretty much instant response on mine - press the clutch and move away as you release. Before the clutch reaches biting point the engine is running and power available.

Is it just me, or are a lot of people on here out to bash stop-start?

My stop-start is very quick - can go from holding on the brake with the engine off when the red changes to red/amber and be restarted and moving before the red/amber goes to green - so no issues with the timing - but I want the turbo to last as the car is a keeper.

Any - Stop / Start Systems - lesatwa5

Pretty much instant response on mine - press the clutch and move away as you release. Before the clutch reaches biting point the engine is running and power available.

Is it just me, or are a lot of people on here out to bash stop-start?

I agree. I can even wait until the car directly in front of me starts to move before moving off myself - the s/s on my 2015 Mazda 3 auto kicks in that quickly!

Any - Stop / Start Systems - bolt

Aha--now I know why there are stupid queues at green traffic lights--whilst stop/start engines "kick" in?

that`s probably because they are either checking texts or just slow, SS is as quick as anyone is doing it manually, as someone else said they just do not like it-I`m the same, but not knocking it, it`s there if I need it

Any - Stop / Start Systems - RickyBoy

...what 'efad2' & 'barney100' said! It's a dog**** invention!

However, I enjoy every other aspect of my motor so put up with it...

Any - Stop / Start Systems - Big John

Stop/start is also one of the root causes of one of the worst driving techniques on our roads today. The 'habit' of sitting at junctions with foot on brake blinding the driver behind with your brake lights. Instead of putting car into neutral with handbrake on, like you was taught to do for your test!!!!

On my Superb what you do with your footbrake or handbrake does not affect the stop/start. It will only operate if you are stationary, are in neutral with clutch pedal up and other conditions OK - eg level of charge of the battery.

Mine works very well but it helps that the engine/car is very quiet - sometimes you don't even spot that stop/start has turned the engine off until you hear the distant whir of a starter motor when you dip the clutch. I tend to use a touch of common sense and don't allow the engine to stop/start unless I'm going to be stationary for some time. I do this by either leaving the clutch pedal down or pushing the stop/start disable button.

Personally - I quite like stop start. Infact it now seems wrong when I'm driving one of our other cars in the family fleet when I'm sat with the engine running for a long time in traffic.

Edited by Big John on 01/12/2017 at 08:55

Any - Stop / Start Systems - Steveieb

Are these systems fitted to buses, lorries , vans and London style taxis which seem to be the main pollutants of diesel fumes?

Any - Stop / Start Systems - FP

I can't speak for London buses, but round here (Hertfordshire) the newer buses do seem to have stop-start.

I don't really understand the bias against the device as shown in the OP and further down this thread. ("Stop/start is a disaster for the longevity of engines and systems.")

What evidence does anyone have that the increased use of the starter and related electrical systems has not been designed for, and will therefore not cause problems with longevity?

"It stresses so many components, including the driver." As other posters have shown, this is purely subjective. I have no idea why anyone would find stop-start stressful. On my Mazda CX-5 it works flawlessly - you are hardly aware of it. I need to press the clutch pedal only when the car in front moves and I get an instant response.

This is the first car I've had with stop-start, but I can't think of any reason why I'd want to disable it - which I could do.

Any - Stop / Start Systems - pd

If you're driving in a heavily congested area and your car has stop/start it is a bit anti-social not to use it IMO.

Every little bit helps and whatever you drive it still chucks crap out the back (last time I noticed petrol cars do not chuck sweet smelling strawberries out the back) and bearing in mind this involves no effort whatsoever on the part of the driver - why not?

Any - Stop / Start Systems - Glaikit Wee Scunner {P}

My stop/start on an Octavia rarely works. I'd like it to work again when I stop at traffic lights.

It seems that all the cars parameters are against it currently. No pun intended.

Even after a long trip , 80 miles or so, the battery is not charged up enough or the weather is too cold. I'd the system checked out at the main dealer and the battery and charging system are ok.

Any - Stop / Start Systems - SteVee

>>Are these systems fitted to buses, lorries<<

On my most recent journey on a diesel bus in London, the engine does indeed stop when the bus stops, the bus then starts off solely on electric power and the diesel engine starts up if necessary.

Any - Stop / Start Systems - Engineer Andy

>>Are these systems fitted to buses, lorries<<

On my most recent journey on a diesel bus in London, the engine does indeed stop when the bus stops, the bus then starts off solely on electric power and the diesel engine starts up if necessary.

..and what a terrible 'thunk' noise they make when the diesel engine cuts in, normally after about 50m or so. Compared to cars, that is no way 'seemless'.

Any - Stop / Start Systems - John F

I think they are a good idea. My old Audi sports car centre console has a button to stop the engine and another button to start it. This stop/start system is operated by my left index finger whenever I'm stopped for any length of time - because 12 pistons idly dancing around in front of my left foot waste a lot of petrol.

Any - Stop / Start Systems - pd

>>Are these systems fitted to buses, lorries<<

On my most recent journey on a diesel bus in London, the engine does indeed stop when the bus stops, the bus then starts off solely on electric power and the diesel engine starts up if necessary.

..and what a terrible 'thunk' noise they make when the diesel engine cuts in, normally after about 50m or so. Compared to cars, that is no way 'seemless'.

They do a bit but it hardly jolts you out the seat. Bearing in mind how much time London buses spend at standstill or crawling along very slowly it must help a bit with the air quality.

Any - Stop / Start Systems - RobJP

Got Auto stop/start on the BMW. It's my third BMW with it, all have been 2.0 diesels. SWMBO's Z4 2.0 petrol has it as well.

Come to halt in traffic / at lights. Move gear lever to neutral. Lift foot off clutch. If the car meets parameters (outside temp over 3 C, battery has enough charge, etc) engine stops. As soon as you press the clutch pedal, engine re-starts.

on an automatic then it works even more seamlessly - you don't need to do anything at all. Just come to a halt for a few seconds and the engine will cut out. As soon as you press the throttle the engine restarts and engages the gearbox.

I struggle to see what is so stressful about it to some people.

Any - Stop / Start Systems - RT

I struggle to see what is so stressful about it to some people.

Turbos don't like being stopped quickly - I guess those who replace cars every 3 years have no interest in longevity.

Any - Stop / Start Systems - RobJP

I struggle to see what is so stressful about it to some people.

Turbos don't like being stopped quickly - I guess those who replace cars every 3 years have no interest in longevity.

If you're in stop/start traffic, then the turbo won't be that hot. So that problem doesn't exist.

Even if you've just come off a motorway after 150 miles at 75-80mph and are parking up, with the slowing down on the sliproad and getting to a parking place it's going to take a minute at least, during which time the turbo is being cooled down.

HJ himself says that "it is wise to idle for 30 seconds or so when the turbo is red hot". I'd happily argue that a minute (plus) of slowing down and parking up will accomplish that, in full.

So you're really left with cases where you're blatting down the motorway at full cruising speed with the turbo red-hot, and then come off the motorway straight into standing traffic. No warning, nothing at all, hard on the brakes from 75 to 0, and then sit there.

Can't think of many times that's happened to me in the last 28 years of driving.

Any - Stop / Start Systems - galileo

Those who don't mind stop/start systems may change their view if they need a new starter motor outside warranty, the cost is much higher than for a normal starter. The batteries aren't cheap either .

Any - Stop / Start Systems - RobJP

Those who don't mind stop/start systems may change their view if they need a new starter motor outside warranty, the cost is much higher than for a normal starter. The batteries aren't cheap either .

Considering auto stop/start systems have been out for quite a few years (BMW, for example, introduced them on a lot of cars in 2007/2008, I seem to recall), you'd expect the HJ problem pages and these forums to be full of starter motor and battery problems if there were weaknesses in the systems.

Especially considering that modern cars have far more electronic demands than even a decade ago

And yet we aren't seeing constant posts of that sort, weekly gripes on the 'Ask HJ' section and Q + A.

So, there is a large lack of evidence of such problems, where you would expect to see such evidence - IF those problems were as widespread as some people seem to fear they should be.

Any - Stop / Start Systems - RT

Those who don't mind stop/start systems may change their view if they need a new starter motor outside warranty, the cost is much higher than for a normal starter. The batteries aren't cheap either .

Considering auto stop/start systems have been out for quite a few years (BMW, for example, introduced them on a lot of cars in 2007/2008, I seem to recall), you'd expect the HJ problem pages and these forums to be full of starter motor and battery problems if there were weaknesses in the systems.

Especially considering that modern cars have far more electronic demands than even a decade ago

And yet we aren't seeing constant posts of that sort, weekly gripes on the 'Ask HJ' section and Q + A.

So, there is a large lack of evidence of such problems, where you would expect to see such evidence - IF those problems were as widespread as some people seem to fear they should be.

AGM battery replacement has become a service item on many cars with SS - it can be eye-wateringly expensive as the ECU's have to be matched to the battery capacity/charge.

No problems to report if you change it on schedule - just £££££

Any - Stop / Start Systems - RobJP

AGM battery replacement has become a service item on many cars with SS - it can be eye-wateringly expensive as the ECU's have to be matched to the battery capacity/charge.

No problems to report if you change it on schedule - just £££££

OK, here's a challenge for you then. Show me one car on which the battery is a 'service item' to be changed on a schedule.

Any - Stop / Start Systems - RT

VW Group - AGM batteries fitted to cars with SS need replacing at 5 years old.

Some other brands don't fit AGM, just basic lead-acid, even if SS is fitted - no doubt requiring battery change earlier.

Any - Stop / Start Systems - RobJP

Erm ...

VW's website states that the battery needs to be checked 'at every service', and they state that they 'may need to change your battery if it's not holding a charge, or look at why it's not charging when you drive'.

Similar on Skoda.

Audi's site says that they inspect battery condition, and colour it green, amber or red on the report.

SEAT similar.

Doesn't say anything, anywhere, about it being a routine replacement at 5 years old.

Any - Stop / Start Systems - andyfr

Seat belt on - Start engine - Turn S/S off.

We are just in the habit and do it without even thinking about it.

Any - Stop / Start Systems - Theophilus

Why so much antipathy to stop-start systems?

The doom-sayers who predict dire consequences seem to be basing their prejudices on a hypothetical increased risk of mechanical failure & associated costs (rather like HJ's ongoing campaign against "normal" v "super" fuels, which rather surprisingly, if valid, doesn't seem to have the backing of any major motor manufacturers!).

But this is missing the point that even if there is an increase in cost at some stage down the line the reason for fitting - and leaving activated - S/S is not to save costs but to reduce pollution levels which otherwise will ultimately damage the lives and welfare of our children & grandchildren. As I wrote a couple of days ago, I'm not a "Green" voter - but hope that I have a modicum of social responsibility for the welfare of others, so I leave my S/S button alone in the default position.

Edited by Theophilus on 02/12/2017 at 14:20

Any - Stop / Start Systems - Dogfuzz

OK yippee!- in addition to battery, which other car components would we recomend for replacement on a service schedule. Catalyctic converter? exhaust system? shockers? all tyres every 3 years? rubber hosing? Alternator?....

....They replace major components on planes which have a 25 year + service life!

Any - Stop / Start Systems - bolt

Those who don't mind stop/start systems may change their view if they need a new starter motor outside warranty, the cost is much higher than for a normal starter. The batteries aren't cheap either .

Considering auto stop/start systems have been out for quite a few years (BMW, for example, introduced them on a lot of cars in 2007/2008, I seem to recall), you'd expect the HJ problem pages and these forums to be full of starter motor and battery problems if there were weaknesses in the systems.

Especially considering that modern cars have far more electronic demands than even a decade ago

And yet we aren't seeing constant posts of that sort, weekly gripes on the 'Ask HJ' section and Q + A.

So, there is a large lack of evidence of such problems, where you would expect to see such evidence - IF those problems were as widespread as some people seem to fear they should be.

I was under the impression SS starters were redesigned to cope with constant ss, with larger capacity batteries as well, I know my battery is larger than the older car as it has SS, and with the charging systems now more capable you rarely get any problems

Any - Stop / Start Systems - Chris M

My Astra 1.0T has stop start and I generally leave it to do its' own thing unless the weather is hot and I want the air con to continue running, or cold and I want heat.

The engine cuts out at the earliest opportunity. In warm weather it will stop (from a cold start) at the junction 1/2 mile from home. The only time I disable, other than as previously mentioned, is in heavy stop start traffic (which I rarely encounter) as whilst the stop is not noticable, the restart is and it can get on my nerves after a while due to the vibration of a three cylinder starting. Once running, the engine can't be felt or heard.

As for the doom merchants here, maybe S/S technology is another EPB timebomb but then again, probably just the same dire predictions as heard when central locking and electric windows became common place some decades ago.

BTW. A battery for mine is around £160. Non S/S around £75. Or put another way, more than covered by the annual VED saving (pre 2017 changes).

Any - Stop / Start Systems - Dogfuzz

anything automatic has a habit of going wrong,going wrong,going wrong.wrong,going.

Any - Stop / Start Systems - FP

The Mazda stop-start system (helpfully called "i-stop"), fitted to many models, uses a large capacitor, not the main battery. I gather this is specific to Mazda.

When this is nearly drained (it will last for about one minute) the car will automatically re-start.

I woudn't therefore expect the main battery to have a shorter life than normal.

Any - Stop / Start Systems - nailit

The Mazda stop-start system (helpfully called "i-stop"), fitted to many models, uses a large capacitor, not the main battery. I gather this is specific to Mazda.

When this is nearly drained (it will last for about one minute) the car will automatically re-start.

I woudn't therefore expect the main battery to have a shorter life than normal.

It lasts a lot longer than one minute, but is dependant on electrical load as it also powers various in car electrics, typically my capacitor power is at least 4 mins, but varies.

Also, can't remember the exact details, but they somehow use the 'unused' compression in one of the cylinders to help lessen the startup load? or have I been confused (again)?

Any - Stop / Start Systems - Dogfuzz

Indeed-bring back starting handles, they were brilliant at keeping you on the go!

Any - Stop / Start Systems - bolt

Indeed-bring back starting handles, they were brilliant at keeping you on the go!

Would anyone know how to use them these days...or even heard of one

Any - Stop / Start Systems - Andrew-T

Indeed-bring back starting handles, they were brilliant at keeping you on the go!

You need to be fit to start a diesel by the handle ....

Any - Stop / Start Systems - gordonbennet

Indeed-bring back starting handles, they were brilliant at keeping you on the go!

You need to be fit to start a diesel by the handle ....

Not so a Lister donkey engine, built in starting handle, valve lifter lever on the head, whizz it round by hand with no compression let the valve lifter go, and away she goes, waking the dead..:-)

Any - Stop / Start Systems - Volts

The Start Stop on my 2016 SMAX needs a hefty shove on the brake pedal to activate S/S

Find if i release the brake the car restarts and lurch forward (Powershift Auto)

Also slow to reenage 1st after a S/S annoying at roundabouts

 

Ask Honest John

Value my car