Stop Start Technology

[takai]

Engines don't wear more at startup than at any other normal time? Hmmmm, Lubrication 101 must be wrong .

Engine is already warm and there is tons of oil already in the system rather than drained back to the sump.

Most of the stop start stuff doesn't kick in unless the engine is warm already.

[sssgtr]

toyota does the stop start by far the best.has been doing it for fuckin 10 years,i love how these other shitheaps claim it as "brand new".

the cx5 has 3,947,261 parameters it must meet just to "istop" and then when it does it hurrendously fails and doesnt work anyway(every cx5 we have sold has had istop issues)

Of course it's going to have a shite load of parameters in order for istop to work, all the other car makers will have similar parameters too on their diesel / petrol engines.

For example, would you really want idle stop working when your battery doesn't hold charge and can't provide full current to the starter?

I have a GTD CX5 on the way, and the one that we drove for a few hours before we signed any paperwork worked fine. Even moving the steering wheel with any appreciable effort caused the engine to restart.

Like I said earlier, if you don't want it to engage, don't press the brake pedal all the way down. I found it very easy to control that way.
And honestly, I would only want it to switch the engine off if I had just stopped at a set of lights that has a fairly long cycle....you would not want it doing it on the freeway in traffic.

[Falc&Send]

Do you use more or less fuel putting the car in neutral and rolling down a hill compared to driving down hill in top gear with very light throttle?

[MexicanBatman]

Closed throttle in drive uses none in most cars now

When I had the FG and coasted it'd show 0.0L/100 on a high speed coast, put it into N and it'd show 1.9-3.3L/100 and same figure idling at the lights

[cheapracer]

The grass is always browner on the other side of the fence.

I ride around often in a Benz S400 Hybrid and it's awesome at lights, so bloody peaceful that it's hard to go back to a car that has it's engine running at lights.

[datso]

That exactly it, stopped at any place with engine off is like your ears and brain suddenly get a breather so its hard to not like this technology however there should be an override button for when you are turning into another road stationary without lights as compared to stationary at a turning lane at a set of lights as I hate to be a delay when Im trying to sneek into lots of oncoming traffic.

[lukevl]

A decent stop start system won't delay you at all. If its a manual it will be running with the clutch dipped, if its an auto it should be running before you get off the brake

[rj_astra]

That exactly it, stopped at any place with engine off is like your ears and brain suddenly get a breather so its hard to not like this technology however there should be an override button for when you are turning into another road stationary without lights as compared to stationary at a turning lane at a set of lights as I hate to be a delay when Im trying to sneek into lots of oncoming traffic.

I think manufacturers would have thought of this... all systems have an override button. It's been mentioned a number of times in this thread.

[smellytofu]

Do you use more or less fuel putting the car in neutral and rolling down a hill compared to driving down hill in top gear with very light throttle?

This is based on my experience. I find if you drive it like you would ride a bicycle with a pair of lazy legs, you will reap the best out of the car. Basically clutch in going downhill to maintain speed and hopefully gain a little speed/slow down the deceleration similar to riding a bike. It's exactly how we wouldn't pedal downhill unless we want to pick up heaps of speed. If do that, you'll realise you would only lose maybe 5km/h in speed in most cases and if you do need to pick up a bit of speed, clutch out, and accelerate.

But all this technique I realised was already discovered under the name of "pulse and glide" as a way to save fuel.

The only time you do let the engine braking to occur is when you are approaching a complete stop and despite what the car trip computer will say, you might actually be using fuel since a real fuel cut out would slow the car excessively and freak out the driver. But in my experience with pulse and glide, I saved 0.5L/100km out of my old average of 7.5L/100km to get sub 7's.

I know it's absolutely geeky to reap every single drop of efficiency but when I drive as much as I do, I gotta entertain myself whilst driving somehow since playing with my phone whilst driving is a no-no.

[edo]

The 208 Pug manual diesel I had in Europe for a month had this...seemed just fine to me. You could turn it off or adjust how long the car would stay running before it switched off. It turned on again as soon as you put your foot on the clutch.
It worked really well...all you sooky cunts are cunts.

[Nugs]

I've been in a diesel XF Jag with this, was extremely annoying. I wouldn't buy a car that wouldn't let me permanently disable it.

[Lardman]

Of course it's going to have a shite load of parameters in order for istop to work, all the other car makers will have similar parameters too on their diesel / petrol engines.

For example, would you really want idle stop working when your battery doesn't hold charge and can't provide full current to the starter?

I have a GTD CX5 on the way, and the one that we drove for a few hours before we signed any paperwork worked fine. Even moving the steering wheel with any appreciable effort caused the engine to restart.

Like I said earlier, if you don't want it to engage, don't press the brake pedal all the way down. I found it very easy to control that way.
And honestly, I would only want it to switch the engine off if I had just stopped at a set of lights that has a fairly long cycle....you would not want it doing it on the freeway in traffic.

Same as in the bimmers - old man has a 328i that has it. (has a button to turn it off but)

It doesn't use the starter to start back up though, afaik it leaves cylinders primed and ready to fire back up to start it (Correct me if I'm wrong?). Doesn't go off if the engine isn't warm, or if you're in crawling start stop traffic.

[tremolo]

When I had the FG and coasted it'd show 0.0L/100 on a high speed coast, put it into N and it'd show 1.9-3.3L/100 and same figure idling at the lights

How can you use 1.9-3.3L per 100km when you're not moving?

If it's anything like my XR5 (or VWs) it switches the litres per hour while stationary (not L/100)

[260BC]

Engine is already warm and there is tons of oil already in the system rather than drained back to the sump.

Most of the stop start stuff doesn't kick in unless the engine is warm already.

Yeh I know that but for a moment on startup there is an engine running without oil pressure in the crankshaft bearings. But who cares, it's the latest gadget, must have.

[BigMuz]

Oil pressure is irrelevant. It just needs a film of oil which it would absolutely have.