Turbo heat

[Mike'A]

Thanks, vn't? I've 1.4 tsi does that have one? It's just done 2,400 mls in France in a fortnight and performed brilliantly returning an average of 46 mpg, considering load, speed and town and city work I thought that was a good return.

[zollaf]

most modern stuff has a vnt rather than wastegated. it means you get planty of boost from low down the revs rather than waiting until 2000 rpm and the boost hitting you like a bus driving into the back of your car.

[skibuddy]

So Stop Start is a bad thing then for your turbo?

[zollaf]

if you are in traffic then stop start won't matter. if you come off a motorway into the services and stop then you don't want the engine to stop, so in this situation its bad.

[silo24]

Bear in mind that the synthetic oils used in modern Turbocharged engines are designed to ensure that these issues do not occur and you do not have to let the engine idle before shutdown.

The main issue that used to affect turbo engines was oil residue sitting under no pressure on the hot turbo and cooking off, leaving carbon deposits which then cause friction problems or oil blockages, meaning extra wear.

These new oils are designed to withstand these temperatures hence less of an issue and no "post-running" needed. Having said all the above, it won't do any harm at all just to be sure as those temperatures probably don't do the oil much good, despite it not burning off.

[jbanfie]

There is another thing in your favour here, the Bi-turbo engine has a water fed cooling jacket around the exhaust manifold to help the engine heat up quicker which has the added bonus of reducing the temperature of the gases before they get to the turbos. I read that on the latest TFSI 2.0 engine in the S3 the gases are something like 178 degrees cooler when they get to the turbo as a result, but can't find the article to post the link.

As the motto goes, every little helps, but I was recommended to avoid start-stop after hard driving and I often consult the oil temperature on the lap timer screen (VCDS mod), to ensure the oil temperature is not hot before switch off. By way of guidance, I can't get the oil above 103 degress C when driving hard, but would like it to be under 100 when I turn off. I have knowledge that 130 is when the car gets upset, but that is Autobahn storming territory which none of us Brits are going to get too and as a result I wouldn't worry too much.

[jbanfie]

Everyone should read and fully understand the following:

http://www.aachener-kolloquium.de/pd...wurms_audi.pdf

It's very interesting, but does say that as the exhaust cooling is improved, they can run the engine hotter!!!!

Cheers

[daycartes]

Everyone should read and fully understand the following:

http://www.aachener-kolloquium.de/pd...wurms_audi.pdf

It's very interesting, but does say that as the exhaust cooling is improved, they can run the engine hotter!!!!

Cheers

Is this the 21st century edition of the Diet of Worms?

[SGH1]

All useful advice and very informative. Cheers.

[Tripletrouble]

Is this the 21st century edition of the Diet of Worms?

No, I think however you will find it is the 21st century version of the can of worms!