Audi A4 2.0T Turbocharger cool down period
06-01-2011, 04:45 PM
#11
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All VW/Audi 2.0T engines have the ability to "reverse" pump the coolant through the turbocharger housing. This is automatically controlled and will only occur when necessary. The idea is prevent coking of the oil on the impeller/turbine shaft, which can eventually lead to turbo failure.
06-01-2011, 05:32 PM
#12
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what he said.... even after a 3 hour drive with a trailer on the interstate AT SPEED, there is always the off ramp and slow side road before you shut down....
if you think about it for a sec, easy driving while moving is better than sitting still idling with no air movement
IMHO (and chevrons) coking of the oil in a turbo engine has been an old wives tale for 10 to 20 years....
With the newer oils - especially synthetics - and better tolerances on turbo bearings, etc.... you won't have a problem unless you drive at FULL boost for 30 minutes with a trailer behind you going up a 20% grade and shut it down immediately...
Been fighting this myth in the turbo diesel arena since my first turbo... YRMV
Last edited by JohnBoyToo; 06-01-2011 at 07:55 PM.
06-02-2011, 10:17 AM
#13
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The problem isn't coking in the engine, it's coking on the shaft inside the turbo. It's a well-documented fact that it can (and does) occur. In fact, read VW/Audi's own engineering literature and you'll see that they specifically designed the cooling system to pump coolant to cool the turbo after shutdown. And in their own words, they designed this feature to "prevent coking" in the turbocharger.
07-10-2011, 12:17 PM
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After you turn the car off you can here the coolant moving. There shouldn't be any need to sit there and let it cool down. The car does it for you.
07-14-2011, 08:51 AM
#15
AudiWorld Senior Member
oh, I didn't detail coking in the turbo ! I used the generic engine ... my bad...
you are probably correct then if Audi said it - good find !
I'm a small sampling size, having had just 4 or 5 turbo'd cars since the 80's - the 89 turbo engine I had did have the auto cooler when shut down and the newer versions did not, the mfg said there wasn't a need for it any longer....
guess like our outdated navs on our new Q, the turbo's are old school too
you are probably correct then if Audi said it - good find !
I'm a small sampling size, having had just 4 or 5 turbo'd cars since the 80's - the 89 turbo engine I had did have the auto cooler when shut down and the newer versions did not, the mfg said there wasn't a need for it any longer....
guess like our outdated navs on our new Q, the turbo's are old school too
Last edited by JohnBoyToo; 07-14-2011 at 08:53 AM.
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