What temp or how long do leave it before switching off. I leave my car in idle until the temp is down to <90Deg..If it's been a spirited drive, I'll lift the bonnet as well as this is the hottest under bonnet temps I've ever encounted from a road car?

Why not just drive the last mile or two very gently?

Doesn't matter really, oil circulates the turbo for a set period, if that's what you are worried about.

Why not just drive the last mile or two very gently?

+1

Or just take your time parking, or reversing to the drive

What temp or how long do leave it before switching off. I leave my car in idle until the temp is down to <90Deg..If it's been a spirited drive, I'll lift the bonnet as well as this is the hottest under bonnet temps I've ever encounted from a road car?

None at all for me. Stop and get out.

If it is very warm the fans and stuff stay on, so I cant see any reason to sit around waiting? Although the roads back to my house are all built up areas so I drive the last 2 miles at a sensible speed, usually in heavy traffic as well.

I'm sure there's a thread on here about an electric water pump circulating coolant for a while after the engine is shut down to prolong turbo life.

Why not just drive the last mile or two very gently?

thats what i do

I believe the turbo has a secondary pump that works even with the engine off

I always drive the last mike gently then leave the car idling while I have a look at how much I've destroyed my avg fuel consumption and gather all my bits to take in with me

Even if I haven't been driving it hard the turbo cooling system normally stays running for a while anyway so I'm not worried.

I certainly wouldnt lift the bonnet, if I had a car that needed that I'd sell it or return it as not fit for purpose

Doesn't matter really, oil circulates the turbo for a set period, if that's what you are worried about.

How do you mean?

Lordy. This stuff dates back to the old Renault GT Turbo days. Just stop and get out like the man says, you can't hurt anything.

My GL2 cuts out all the time when you stop.

Presumably Skoda know you can't damage the turbo so are quite happy to fit a stop/start system.

I appreciate I might be wrong here, but turbos are oil-cooled, not water-cooled? Once the engine is stopped, oil is no longer pumped round the system. The radiator cooling fan will sometimes continue to run, but I've had that on a number of cars in the past, it's nothing new.

So, if you are out giving it the beans, then suddenly stop and switch off the engine, the turbo (or, specifically, it's bearings) really isn't going to like that very much. Once you slow down and drive at lower speeds again, the turbo will cool down quite quickly. Ensuring you do the last few miles at normal speeds should be more than enough to cool things down. If you're really worried, let it tick over for 30 seconds before you switch off.

Shouldn't need to do any more than that IMO.

Petrol turbos are oil and water cooled/lubricated. Diesels just oil as they don't get so hot due to lower revs and better thermal efficiency.

My Subaru was fitted with a Turbo Timer.

Thus when I switched off the ignition withdrew the key and locked up the engine continued to run for a fixed period of time. Sometimes this was very necessary as after taking the car round the track for a few laps the turbo was glowing red hot.

Sometimes necessary for the track, yes, but technically illegal to use on the roads.

Leaving a vehicle unattended with it's engine running is called "quitting" and you can be done for it.

I appreciate I might be wrong here, but turbos are oil-cooled, not water-cooled? Once the engine is stopped, oil is no longer pumped round the system.

There is a pump which continues running after the engine an ignition is switched off if the turbo is particularly hot. Next time you really heat yours up, park up and switch off then stick your head by the front grill. You should hear a faint whining noise

Lordy. This stuff dates back to the old Renault GT Turbo days. Just stop and get out like the man says, you can't hurt anything.

Oooh the memories.

Switch the engine off too soon and....

1. Kill the turbo or 2. Evaporate the fuel from the carb making it impossible to restart.

To try and compat this Renault fitted a cooling fan under the carb but they didn't fit a fuse. If you upped the boost chances are you would get the cooling fan too hot then it would sieze, short out and set fire to the wiring loom.

On the plus side you could easily push it to near 200bhp and they weighed about half a tonne less than a modern small hatch. Totally mental things when modded.

Cheers

Lee

i always turn on the aircon to have the extra fan running when idle .

Normally drive slow ish on last few miles home and idle for a min before turning off. Safety first

Thanks for the interesting replies, the reason why I asked was because of the caution notice on Pg88 of the Owners Manual..

Caution

you should not switch the engine off right away at the end of your journey after the

engine has been operated for a lengthy period at high loads but should be allowed

it to run at idling speed for about 2 minutes. This prevents any accumulation of heat

when the engine is switched off.

I don't understand why this is neccessary if the oil pump continues to recirc oil after switching off??

Of course the manual doesn't help matters by then stating...

Do not leave the engine running when towing - risk of damaging the engine. In

vehicles with catalytic converters, there is a risk of unburnt fuel from getting into

the catalytic converter where it will ignite. This in turn would damage the catalytic

converter, and destroy it. You can use the battery of another vehicle as a jump-start

aid  page 182, “Jump-startingâ€.

As per the above...

Dear Skoda, please define "lengthy period at high loads"...

Track use?

I guess being on page 88 tells its own story about how necessary this is these days.