Turbo

[yetta]

do you have to cool off the turbo? or can you just shut off the car?

[Khyron]

The turbo is always spinning so it's working even if you drive like a puss. The reason for cooling/resting is because if your turbo is hot and you just stop it, the oil inside will cook (it's basically in a 400+ degree oven) and turn to sludge. So by idling, you let the oil circulate (cooling the turbo). You should always drive super easy for the last few minutes of your trip (like 1/8th throttle) or let it sit idling for a minute before you leave.

Khyron

[milesmcewing]

1.8t's and most VR6's have a second electric water pump that cools the turbo down after you shut off, to eliminate the oil coking up inside the bearing, it is good practice to idle down, but VW has created this solution. (don't know what the pump does on a vr6)

Cheers

[R_Ethug]

even on my stock 1.8T i let it sit for 2 minutes usually after a long drive or if i drive home from work I take it easy the last 1km of my trip since its a 50zone and i then let it idle for about 1 minute.. gotta keep it healthy..

[Canadian Turbo]

On a TT 225hp you can here this cooler running after the car is shut off. I was unaware that our cars had these I thought the the 225s where the only ones which had it maybe their's is different?

[Canadian Turbo]

Yes I have been told by people on the vortex that there is an extra turbo cooler on the TT225 and if you ever listen to it when it is shut off it makes a noise different then our cars and it is only on the 225 TTs not the 180TT or our 1.8Ts from what I have been told.

[alien]

I have not heard of the 225 TT having any extra cooling features other than dual intercoolers. Another reason not to shut the car down after driving hard is because the turbo can spin up to 150000 rpm and will continue to spin after a hard run. Shutting the car off right after a good hard bag will stop the oil flow to the turbo although it's still spinning, not good. Of course that is on the on the "older" systems, I have not really had any real confirmations about our cars having some sort of secondary oil feed that will still run oil through the turbo after the engine has bee shut off, I still let it idle for a bit after a drive, especially after a hard drive or hot summer days.

[milesmcewing]

The main issue is heat soak, moving the oil is not necessary for cooldown, the water pump will push more than enough coolant past the bearing to keep the oil from heating up over 250. Peter, the only difference to the 225 TT is the intercooler setup, otherwise it is the same water and oil systems, we interchange parts all the time, there are some internal differences in the connecting rods and maybe a bearing or two.

We use the coolant pump to power our air\water system on the Beetle, this still keeps our intake charge cold even at 100 outside.