Do I need to let my turbo cool on my vrs cr like I had to do with my fabia vrs pd after a long run?

Can't do any harm

Cooling a turbo is less important on a diesel than on a petrol anyway. Having said that, if the last minute of your trip is off-boost, say below 1500rpm, idling for another minute just wastes fuel.

just keep it steady for the last five to ten minutes at the end of the journey.

Do the same as you were doing with the Fabia

I was actually wondering if that was the thing to do.....A friend of mine who had a skyline recommended to me do always cool the turbo for at least a minute or 2...

Always best to let them cool down, be it staying off boost at the end of the journey or letting the engine idle for a minute after. You wouldn't thrash your engine from cold, try to show it the same sympathy after it's been under load.

Yep, normally as I'm getting to my destination I'm off boost for a minute of so - then I'll just turn the car straight off when I stop.

 

But otherwise, say I come into a motorway service station for a break after the car's been running at those speeds for an hour or more, and the turbo's obviously been working for all of that time, I'll park up and leave the car to idle for a minute before turning off. Just allows oil to circulate.

I know some will disagree but IMHO there's no need to let the turbo cool on any diesel. Turbos on petrol engines are a different matter altogether, (some petrol turbos will glow cherry red after sustained hard driving!) but the turbos on diesel engines get nowhere near as hot as this.

 

I've been putting my money where my mouth is with this over the past 20 years with a variety of turbo diesels of different makes, often kept to 150-200k, and never managed to kill a turbo on anything yet.

I have heard the turbo on the fabia tsi is water cooled and this is why it doesn't need to be let to cool. Is this right?

I have heard the turbo on the fabia tsi is water cooled and this is why it doesn't need to be let to cool. Is this right?

 

Yes. The 1.8 TSI also has a water cooled turbo and possibly the 2.0 TSI too.

But not the diesel?

No....but as mentioned the exhaust gas temperature is a lot higher on a petrol engine...500 - 750 degrees C Vs  250 - 450 degrees C in a diesel.

 

This is is also the reason that there are hardly any variable vane turbos on petrol engines.....they have to be made of advanced expensive materials to withstand the heat. 

 

But 450 C is still pretty hot, and you would not want to be in the habit of stopping the engine with the turbo at that temperature......you'd cook the bearings eventually. So driving with consideration for the turbo will do no harm.

Edited 19 September, 201312 yr by booke23

You have the heat issue, and you have the oil circulation issue.

 

You might be fine yes, like any number of other things. But in mechanical sympathy terms, it's no hardship to allow the turbo some time before shutting off.