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Caveat: For cars not equipped with automatic start/stop, the starter and possibly the battery might not be specced for it so it could cause additional wear. Cars with start/stop systems often assist the process with precise camshaft position measurements and the ability to squirt fuel pretty much right away so the starter doesn't need to do as much work.
Also don't do it with a cold engine - it's better to get the oil up to temp faster, it'll also reduce fuel consumption as the engine heats up.
Thanks for reminding everyone of this. The gas savings over time will probably end up being the same, or less, than a starter on an older vehicle. Of course, if you're not planning on keeping the vehicle until it dies, this is less of an issue for you.
It's the battery prematurely dying that's also an issue. Especially if the battery needs coding to the car. Could be a £300+ job. That's a lot of fuel that'd need to be saved to be close to worth it.
It's all about emission testing anyway. Keel start stop off.
It's amazing how much batteries have increased in price since Covid.
I bought a car battery for my GF while I was out and she was upset at how much money I spent until she went online and saw that $200 for a car battery was totally normal.
If memory serves me right, it wasn't long ago that many were well below $100.
Stop start cars have more expensive agm batteries typically
Wait, CODING? Are you serious? I can understand this with EVs, but for a standard 12 volt battery? This sounds more like a thing they do to keep you from doing your own work and allowing shops to charge more flag time for what should be a 10 minute job. Replacing a dead battery is one of the simplest jobs you can do. The hardest part of a battery swap should be finding your 10mm socket.
Yeh, you have to tell the car a new battery is installed to alter the V for start/stop mainly.
This is such absolute crap. The math didn't check out in the slightest, and the backslapping on this topic alone could Flintstone a vehicle all by itself. 🤦🏼♂️
Cars with start/stop systems often assist the process with precise camshaft position measurements and the ability to squirt fuel pretty much right away so the starter doesn't need to do as much work.
I always wondered why hybrids could start their engines instantaneously, when many conventional cars couldn't. This is why, isn't it?
I can't speak for other cars, but my Prius uses the electric assist motor as the starter motor as well. Compared to a regular ICE car that's a massively stronger electric motor than average starting a smaller than average engine.
My favorite thing about it though is I have the longer hatchback model and if you replace one of the back seats you can fully lie down for car camping. What about the heat you may ask? I can just leave the AC on overnight, the car will start up and use the engine like a generator to recharge the battery then turn back off autonomously. I always keep some spare gas in case but I'm always shocked how little it uses.
This is why, isn’t it?
Regular old cars use weak starter motors from the 12V battery. They've gotten better, but it's still just a small part used only to start the car, so it only turns over the engine fast enough to get it going.
A car like a Prius will put the car's big, beefy generator in "reverse" to start the motor at whatever RPM the computer wants it at, and since it has abundant power from the synergy drive batteries, it can start the engine at whatever RPM the computer deems appropriate.
I walk, cycle, or longboard places whenever possible, and when these automatic cars started coming out, I thought they were manually starting and stopping their cars at each intersection. It really tripped me out.
Starting and stopping a car is the worst thing you can do to it, doing it repeatedly on purpose is just asking for expensive problems, like a burnt out starter, missing or worn teeth off the flywheel, broken stater mount on the block, dead batteries, coked up and worn out turbo bearings, bearing and knock issues due to lack of lubrication, soot buildup in diesel engines, failed emissions systems, etc.
The few pennies you save in fuel is not worth it, upping the time to 5 minutes would make more sense.
In some cities in my country (maybe all) it is regulated and fined to idle your car over 1 min, the point of it I think is to make people used to turning off their cars for train crossings and bridge openings.
Makes sense. The biggest takeaway from this post is that long idling is wasteful. If your vehicle isn't designed with auto start / stop, then don't turn it off and on in traffic. If you are waiting in a driveway for someone to come out, then turn it off.
It's not necessarily an issue of fuel, but the overall wear on the components and engine when you start a car. A starter motor only has so many "starts" it can do before dying. The battery too.
Starter motors have gotten a lot better since the "bad old days" and engines start more smoothly thanks to fuel injection and computer control systems, so manufacturers have decided that it's ok to start/stop engines as needed, but the reason for not doing it was never a matter of fuel savings.
The whole world has weighed in and explained why more starts and stops lead to excessive wear, but I’d like to take a moment and bring a little attention to the environmental damage that having to do a bunch of work to your car because you turn it off at every opportunity does.
Let’s say you need a new starter motor early. That’s copper, aluminum, iron, steel and a handful of rare earths for the solenoid. Melt em, smelt em, form and mold em, that’s more carbon from building the replacement part than you’d have kept out of the atmosphere by shutting off the car at stoplights.
The greenest car parts are the ones already in it.
Life Pro-tip: don't turn your car off unless you're safely parked. Not only is it insanely unsafe, but you're actively blocking traffic even if it's stopped around you; in the event of a wreck involving your car in said inert state, you're in legal trouble in a number of directions. Don't be a dumbass.
The infinitesimal amount of "saved" fuel is absolutely nothing compared to the mind-bogglingly enormous amount of commercial waste that pushes our civilization to the brink. You're not "doing your part" in any way at all with this bullshit. Stop already and think, FFS. 🤦🏼♂️
Many new cars have start/stop features builtin. If the computer controller detects that the engine may have trouble starting (low temperature, low battery, starter motor failure, whatever), it won't stop the engine for you.
Or that's the theory.
Chiming in to agree that the scenarios listed are mostly ridiculous to think about turning your car off. Knowing that ~7 seconds of idle time is a reasonable threshold for just turning off your car is certainly useful, but how many times has someone turned the ignition key and the car hasn't started due to battery drain or some other failure? Now imagine that happening at a stoplight, a drive-thru, or a rail crossing.
I don’t think that stopping and starting the engine a lot is a good idea, even if it is not unhealthy to the engine. In the situations you had as examples, it is just inconvenient to turn off the engine and have to start it up again.
Right. And just think about being stranded at a stoplight because your car refuses to start again.
Yeah new cars usually have the ability to do that themselves and also usually do it when safe.
They auto start when power is needed or if the situation changes. Eg: touch the steering or gas pedal. Another example is my car will auto start it too many cars are around me.
Shutting your non-auto starting car off and then having an emergency happen could land your ass in trouble with insurance and the law. If you're on the road, your car should be running (unless it was designed this way). Of course people mentioned wear and tear, so that too.
Cheers -Henry
Exceptions: if you live somewhere where you'll die in 4 minutes in a car with no AC.
Sent from Texas, where it is currently 88 degrees in the middle of the night.
Starting the engine puts as much wear on it as driving for 50 miles. Automatic start/stop hurts engine longevity by doing that unnecessarily and should always be turned off.
My car uses 0.5l of fuel idling for an hour. There's no way in hell that a start/stop system would even save 10$ a year, so there's no benefit to using it.
That's not true, cold starts cause wear not warm starts.
At most it's starter motor and battery wear, start stop cars have agm batteries for that reason.
Cold starts cause more wear than warm starts, but a warm start still causes a lot of wear because the engine doesn't have oil pressure when it's off, so it doesn't have good lubrication until it turned over a few times.
Besides that, my car and many others will happily stop the engine on their own even before reaching operating temperature. At least I can turn it off with a single button instead of going through a menu on a touch screen.
What about the fact that the oil drains to the pan in those few seconds that the engine is stopped?
This is my real concern. Sure you can upgrade starter motors and batteries to handle the extra cycles, but you can’t do anything about increased scoring and wear on cylinders in the milliseconds before the fluids start to circulate again.
Some start stop engines have auxiliary oil pumps. I don't know much about them besides random research I have done in the past out of curiosity.
Napa also claims some vehicles have auxiliary water and transmission pumps as well.
Believe it or not, they thought of that when they created start/stop systems.
In cars with these systems, the back pressure in the engine's cylinders is greatly reduced via a variety of strategies including selective alteration of valve timing and purpose-built secondary valves. What this means in effect is that the torque required to re-start the engine is a fraction of a dead cold start, and even a fraction of a normal warm start. This should serve to minimize additional destructive wear on components.
In effect, well-designed start-stop systems do not create any additional wear on vital engine components versus the engine running for that same period of time.
The difference in wear might be too small to measure, but what we can measure is how much fuel it saves. And that's usually less than 50l over the lifespan of a vehicle. Those systems don't even offset their own cost unless you spend all day at railroad crossings.
They are there for two reasons: Getting better results in unrealistic tests and decreasing the amount of control that owners have over their vehicles.
I've always wondered where the line is that makes turning the car off more optimal than idling. Another poster talked about upping the time to 5 minutes because of the wear and tear on the engine from starting which I think sounds reasonable although 5 minutes at an idle is a pretty long time lol. The other thing I've always wondered is when it's more efficient to use your AC rather than just roll the windows down cause at a certain speed having the windows down slows the car down more than the energy it saves in not using the AC I would assume.
I think mythbusters did this one. Ac is more efficient iirc. Dont quote me.