Turbos and cooling down

ScoobyDoo69 · 15 Mar 2011 at 17:18

Can't say I think 70c is enough personally but fair enough. Mine takes a good 4-5miles to get up to temperature, obviously depending on traffic conditions etc!

Matt82 · 15 Mar 2011 at 19:21

yup, 70*C oil temp is fine for me

Justintime · 15 Mar 2011 at 19:25

Let my E90 320D idle for a minute, can't hurt i say.

Dangerous Dave · 15 Mar 2011 at 19:29

I normally wait until the oil is at the normal operating temperature which is 90c on mine takes about 4-5 miles to reach that.

DJB · 15 Mar 2011 at 20:55

Dangerous Dave said:
The VAG turbos are water cooled with a pump that runs when the engine is off to keep the coolant flowing they had this before the stop/start cars. My friend's 2001 Ibiza Cupra has one so they have been about for a while.

even the 2.0 TFSI ?

I've got Golf GTI MK5 and i've never heard anything that sounds like water
circulating around it ?

Dangerous Dave · 15 Mar 2011 at 21:38

DJB said:
even the 2.0 TFSI ?

I've got Golf GTI MK5 and i've never heard anything that sounds like water
circulating around it ?

I just double checked and it does going by the parts diagram it is just before the thermostat on the coolant feed to the turbo. I have never heard it on mine either but you couldn't hear it on my friend's 1.8T until it was starting to fail.

Type_R · 15 Mar 2011 at 22:17

DJB said:
even the 2.0 TFSI ?

I've got Golf GTI MK5 and i've never heard anything that sounds like water
circulating around it ?

I didn't know this either!! I suppose it makes sense, although I have never heard it at all, even popping the bonnet when the engine is clearly very warm!

Simon · 15 Mar 2011 at 23:03

Zddp only really starts to work at 80C.

As for turbos, convection circulation in the water system will help avoid heatsoak, this is the primary reason for the coolant on a turbo. The oil does most of the cooling in the bearing, and airflow does a good job on the housing. If you drive off boost for the last few mins of journey and allow 20-30 seconds of idling this is fine.

Oil does have an effect on turbos, the less VM the better

Matt82 · 16 Mar 2011 at 08:50

DJB said:
even the 2.0 TFSI ?

I've got Golf GTI MK5 and i've never heard anything that sounds like water
circulating around it ?

it honestly sounds like youve got a fish tank under the bonnet and the noise starts when you switch it off

Type_R · 16 Mar 2011 at 09:50

Matt82 said:
it honestly sounds like youve got a fish tank under the bonnet and the noise starts when you switch it off

I'll go do some investigation after my next drive and report back!