Turbo - Wait Time

[VWKev]

Anyone give their Turbo time to rest when they come to stop before turning off the engine ?

I understand if its a quick nip to the shops and the turbo has not been used you may not need to do this, but if you have been driving in higher revs then just stop and turn your engine immediately off, you havent given the oil time to clear out of the turbo so if you turn the engine off right away the Turbo is still turning and it could run dry.

Does anyone actually do this, or is it not needed in the GTI ?

[jdjd]

y.

Does anyone actually do this, or is it not needed in the GTI ?

I think its advised, But do I ever bother? No

[AlanD]

This is what I do - Last mile or so I take it nice and easy when I know Im nearly at my destination and try and avoid spooling the turbo up to give it time to cool. I then leave it 20 seconds. Any more than that is overkill in my book. The KO3s turbos arent are high pressured as the ones you get on Scoobs and Evos so you dont REALLY need to worry too much about. Every little to help keep the car in top condition can only help.

My 2 pence worth.

[Steve30]

I do it as much I can , but somtimes I just forget , but its very important to do it otherwise you will blow your turbo esp if its re-mapped?? Mine isnt mapped still do it anyway!!

[jdjd]

I do it as much I can , but somtimes I just forget , but its very important to do it otherwise you will blow your turbo esp if its re-mapped?? Mine isnt mapped still do it anyway!!

Then surely give a sh!t? Turbo blows surely thats why you have a warrenty

[Steve30]

I do it as much I can , but somtimes I just forget , but its very important to do it otherwise you will blow your turbo esp if its re-mapped?? Mine isnt mapped still do it anyway!!

Then surely give a sh!t? Turbo blows surely thats why you have a warrenty

Not sure what your getting at?? warentys run out also mapped cars are not covered under warrenty's. VW would never cover a blown turbo on warrenty if its mapped??

Lets just say its good practice to  let the engine run for a couple of mins after sprited drive!!

[AlanD]

Not sure if thats needed on the TDIs 

[Steve30]

Not sure if thats needed on the TDIs 

Hi Alan , can you enlighten me more on this then with Diesel's? Thanks Steve

[VWKev]

I think I'll start doing it then, no harm in it.

[mac7]

I'm not sure if the GTI engine keeps oil circulating through the turbo for a while after switching off? Maybe someone can confirm this.

But to clarify this a bit, you want to be doing what is best to remove as much heat from the turbo as possible before switching off - particularly after a long or hard run. Heat soak into the turbo housing, bearings, scroll etc is what you want to minimise as it can degrade oil leaving deposits which can affect bearing life. Even on a short run the turbo will spool up very quickly to 80,000rpm plus each time you accelerate, so that short trip and stop-start driving can be just as hard on it.

The main mechanism for dissipating heat from the turbo bearings is the flow of engine oil. So driving the car sensibly for the last few miles gives the turbo time to cool down before you switch off and cut the oil flow. Leaving it to idle for a while after stopping would also be helpful if you've just come off a track after a couple of laps, as it obviously keep the oil flowing (and thus cooling) for longer.

A re-mapped car means higher boost pressure, higher air temperature in the turbo and more load on the bearings, so it does become a bit more important to treat it nicely.

Having said all that the fully synthetic oil VW specify is designed to survive the high temperatures experienced after engine shut down with minimum deterioration. Personally I just drive it normally for the last few miles of a long journey.