From my TDI Pump Duse days I always let the car idle after giving it some beans before turning the engine off with the key.  

 

It dawned on me the other day, if I've been "encouraging" the throttle and then hit traffic etc and come to a stop, the turbo will still be spinning at high rpm without lubrication as the engine stops. 

 

Does anyone know if the EA288 engines have any oil systems that continue to operate after stop start activates to prevent damage to the turbo bearings?

 

I would add I don't want to disable stop start as I think it's good to have it operating as designed. 

 

Thanks. 

I would say, ideally a turbo fed engine does not stop immediately after high demand.

 

If your start stop system does that, in some circumstances, I'd disable it temporarily in that occurrence.    Sure coolant recirc has improved. Also, a lot of times if you are driving at dual carriage way speed or motorway, you will come off and have some residential roads to travel to cool down. But if not, for any [boosted] engine, petrol or diesel it is never good practice to turn off with significant heat soak still present.

Edited 28 July, 20214 yr by TheClient

2 hours ago, paulski said:

I would add I don't want to disable stop start as I think it's good to have it operating as designed.

ISTR that, if you leave the car in gear and your foot on the clutch, that temporarily disables stop/start until you select neutral and release the clutch.

15 minutes ago, KenONeill said:

ISTR that, if you leave the car in gear and your foot on the clutch, that temporarily disables stop/start until you select neutral and release the clutch.

 

Should add its a Dsg gearbox but you can slip it into neutral still. 

 

39 minutes ago, TheClient said:

I would say, ideally a turbo fed engine does not stop immediately after high demand.

 

If your start stop system does that, in some circumstances, I'd disable it temporarily in that occurrence.    Sure coolant recirc has improved. Also, a lot of times if you are driving at dual carriage way speed or motorway, you will come off and have some residential roads to travel to cool down. But if not, for any [boosted] engine, petrol or diesel it is never good practice to turn off with significant heat soak still present.

Indeed my thoughts too that it needs time to get rid of some heat,

 

I've got it in my head now that even coming off a motorway/dual carriageway to a slip road it will stop immediately. 

 

I'll have to test the theory that it won't start stop after its been worked a bit, let's face it,  the car has the oil temperature on the maxidot, so ECU can reference that to decide if it's "ok" to stop. 

 

 

If ever I've been out and had a 'brisk' journey, when I'm getting closer to home keep an eye on the oil temperature. It would appear (just from what I've found) if the oil temperature is above 100c, the car won't cut out and the fans will be going like mad.

An end from any fast drive out has a few junctions and 30mph roads so I'm able to calm the car down.

If it doesn't cut out when I'm home, I just idle it on the drive for a bit.

In most of my regular driving, the start-stop is pretty much useless. Traffic lights around here almost always cause you to stop, but often not for as much as 20 seconds. Most junctions become dangerous if the start-stop has killed the engine just when you need to move off without delay. I often use the local bit of motorway and never want the engine to stop just after coming off it at the junction, for engine lubrication and cooling reasons.

So it stays switched off by default. I do enable it when I feel it's going to be beneficial and not harmful or plain dangerous. But this is not often. 

That is why Stop / Start has an off button.

But then not everyone drives just in Bristol or Cities or locations where Stop / Start was really introduced for so that hundreds or thousands of cars were sitting with engines running when not moving.

 

As to the Stop / Start and turbos and oil and temperature, the engineers were fully aware of issues when designing the systems.

Maybe some manufacturers make a horlicks of the systems but they have been on the go for well over a decade now.

10 hours ago, e-Roottoot said:

That is why Stop / Start has an off button.

But then not everyone drives just in Bristol or Cities or locations where Stop / Start was really introduced for so that hundreds or thousands of cars were sitting with engines running when not moving.

 

As to the Stop / Start and turbos and oil and temperature, the engineers were fully aware of issues when designing the systems.

Maybe some manufacturers make a horlicks of the systems but they have been on the go for well over a decade now.

If it was a problem I'm sure there would have been many threads about turbo failures. Same as the start/stop system, some people won't use it because of the supposedly extra wear and tear on the system.  I'll bet the majority of owners use their car without giving  a second thought  to the mechanics and just let the systems take care of everything.

It was a problem back early on with turbos, decades back now.

 

As to pulling off a UK Motorway even if you were fully loaded and doing 30 MPH over the speed limit and your engine is super toasty, coolant and oil and you stop dead at a service area the engine will be taking care of its self.   

Coolant circulates, fans suck and blow and all is well with the world. 

No need to open the bonnet and blow cold air at it.  eg F1.

On 30/07/2021 at 08:03, e-Roottoot said:

No need to open the bonnet and blow cold air at it.  eg F1.

Where's the OCD fun in not worrying about turbo-overheating?

Thermostatically controlled louvres that open/close to allow cool air in and warm air out help.

I think there are already some cars with this feature on, and I think it's a great idea. I think they're normally implemented at the front, and generally to help the engine warm up quickly.

I don't see why somethign similar couldn't be implemented on bonnets.

It might be "cool" to watch your bonnet louvre vents open and close automatically from time to time in slow-moving traffic on a hot day, and genuinely useful in lowering under-bonnet temperature.

(A little off topic, but I remember the trend of people sticking fake RS Turbo vents on their bonnets, so public acceptance of bonnet vents probably wouldn't be a problem.)

 

Edited 11 August, 20214 yr by EnterName
punctuation corrected