Turbo cooling down time
Discussion
Having searched the internet for some official answers (well, for 5 minutes anyway), I can't find anywhere that seems a reputable source on this issue other than people on forums who seem to have no real back-up to their reasons. Some seem to say no idle, some 30 secs, some a few minutes.
So what's the crack here? How important is it really and are there any good sources on it?
So what's the crack here? How important is it really and are there any good sources on it?
Edited by Patrick Bateman on Friday 28th May 00:35
Again I have no proof so take my answer as you will but my understanding was that you should wait around 2-4 mins since the last time you used the turbo. Your not waiting for it to cool down your waiting for it to stop spinning, which takes around the 2 min mark, depending on how hard your running it.
ymwoods said:
Again I have no proof so take my answer as you will but my understanding was that you should wait around 2-4 mins since the last time you used the turbo. Your not waiting for it to cool down your waiting for it to stop spinning, which takes around the 2 min mark, depending on how hard your running it.
That would mean an idle time of 2-4 minutes then as staying completely off the boost is rather difficult when your turbo starts spinning at say 1750rpm.So that seems a bit excessive. This is why I'm wanting to try and find an official line on it.
Patrick Bateman said:
ymwoods said:
Again I have no proof so take my answer as you will but my understanding was that you should wait around 2-4 mins since the last time you used the turbo. Your not waiting for it to cool down your waiting for it to stop spinning, which takes around the 2 min mark, depending on how hard your running it.
That would mean an idle time of 2-4 minutes then as staying completely off the boost is rather difficult when your turbo starts spinning at say 1750rpm.So that seems a bit excessive. This is why I'm wanting to try and find an official line on it.
When I had my Imprezas I would drive the last couple of minutes home quite gently to allow the turbo to cool a little.
On track days I would let it idle for 2-3 mins before switching off.
My understanding is that it allows the oil to circulate and cool the bearings rather than the hot bearings baking the non circulating oil dry, which then does not do the bearing any good when you next start the engine.
On track days I would let it idle for 2-3 mins before switching off.
My understanding is that it allows the oil to circulate and cool the bearings rather than the hot bearings baking the non circulating oil dry, which then does not do the bearing any good when you next start the engine.
Corpulent Tosser said:
When I had my Imprezas I would drive the last couple of minutes home quite gently to allow the turbo to cool a little.
On track days I would let it idle for 2-3 mins before switching off.
My understanding is that it allows the oil to circulate and cool the bearings rather than the hot bearings baking the non circulating oil dry, which then does not do the bearing any good when you next start the engine.
Same with my S3.On track days I would let it idle for 2-3 mins before switching off.
My understanding is that it allows the oil to circulate and cool the bearings rather than the hot bearings baking the non circulating oil dry, which then does not do the bearing any good when you next start the engine.
If you are really worried, get a turbo timer.
Corpulent Tosser said:
My understanding is that it allows the oil to circulate and cool the bearings rather than the hot bearings baking the non circulating oil dry, which then does not do the bearing any good when you next start the engine.
This is correct. Not just the bearings though, everything gets hot!
Personally i'd say a minute or so would be plenty. Leaving your car at idle for forever and a day (like some of my friends have taken it upon themselves to do) will actually heat the car up.
But will they be told?? Nope!
You only want to keep oil circulation around the turbo whilst the everything 'spools down' so no bearings are running without circulation.
But will they be told?? Nope!
You only want to keep oil circulation around the turbo whilst the everything 'spools down' so no bearings are running without circulation.
eliot said:
As others have said, drive off-boost for the last couple of minutes or so - which means plenty of nice cool air flowing through the turbo, as opposed to sitting with the car idling which has hardly any air flow. Turbo timers are pointless IMO.
They're not pointless. Yet another thing nailed to the dash that has pretty lights and beeps.If you are driving at normal road speeds you'll not need to worry about your turbo, just start and finish your journey steady.
Our combine harvester runs under full load continually for 10 hours at a time, by the time the operator has parked up, switched his lights off and got his bait bag ready to leave, the engine will have had plenty of time idling.
Our combine harvester runs under full load continually for 10 hours at a time, by the time the operator has parked up, switched his lights off and got his bait bag ready to leave, the engine will have had plenty of time idling.
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