Turbo - to cool down or not to cool down?

So do turbos need cooling down for a few minutes before turning off the motor after a long trip or do you just turn the motor off and walk away??

I don't switch off unless the pyro is under 150 deg

Don't just turn it off after a long run, If you don't have an EGT gauge fitted and going on a trip and you have been sitting on 100kph.
when you get to your destination let it idle for a few minutes , this will allow temps to even out, and the exhaust temps to fall
If your just going to work unless you drive like Mario Andretti, by the time you grab your wallet, papers ,briefcase ,whatever should be enough time to let exhaust temps come down.
after all there is not rush, is there?

It's not so much the length of the run as the latent heat in the Turbo/Oil/Engine if it has been working hard.
If you fang it thru the 'burbs and screech into the driveway with EGT's up around 400 then it needs a decent cool down period.
If you drive 1,000 kilometres but the last few K's or so sedately and the EGT's are down then its OK to switch off immediately.

My rule of thumb is similar to Winnies...
If the Water Temp is around 87-89 deg AND the EGT is below 200 I'll switch mine straight off.
If the temps are higher then I'll select a suitable interval on the Turbo Timer or sit and monitor the temps are suitable before I switch off.

If you could see the turbo during a long run at speed at night, it would be cherry red, they need to cool a bit before shutdown IMO.
Cheers, the ferret.

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Originally Posted by Winnie

I don't switch off unless the pyro is under 150 deg

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You used to say 200 degrees, are you getting more delicate these days...lol

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Originally Posted by threedogs

Don't just turn it off after a long run, If you don't have an EGT gauge fitted and going on a trip and you have been sitting on 100kph.
when you get to your destination let it idle for a few minutes , this will allow temps to even out, and the exhaust temps to fall
If your just going to work unless you drive like Mario Andretti, by the time you grab your wallet, papers ,briefcase ,whatever should be enough time to let exhaust temps come down.
after all there is not rush, is there?

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totally agree about the rush thing

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Originally Posted by AB

You used to say 200 degrees, are you getting more delicate these days...lol

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That was the old turbo haha. This is the new one that I paid for with my precious dollars so I want it to last. Hahaha

what are the side effects if you dont let it idle and cool down?

Thea small layer of oil solidifies on the turbo/pipes (think a sort of cholesterol effect). Eventually the turbo can't be lubricated/cooled effectively.