GolfGTIforum.co.uk
Model specific boards => Golf mk6 => Topic started by: VWKev on 12 May 2010, 13:17
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Anyone give their Turbo time to rest when they come to stop before turning off the engine ?
I understand if its a quick nip to the shops and the turbo has not been used you may not need to do this, but if you have been driving in higher revs then just stop and turn your engine immediately off, you havent given the oil time to clear out of the turbo so if you turn the engine off right away the Turbo is still turning and it could run dry.
Does anyone actually do this, or is it not needed in the GTI ?
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y.
Does anyone actually do this, or is it not needed in the GTI ?
I think its advised, But do I ever bother? No
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This is what I do - Last mile or so I take it nice and easy when I know Im nearly at my destination and try and avoid spooling the turbo up to give it time to cool. I then leave it 20 seconds. Any more than that is overkill in my book. The KO3s turbos arent are high pressured as the ones you get on Scoobs and Evos so you dont REALLY need to worry too much about. Every little to help keep the car in top condition can only help.
My 2 pence worth.
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I do it as much I can , but somtimes I just forget , but its very important to do it otherwise you will blow your turbo esp if its re-mapped?? Mine isnt mapped still do it anyway!! :cool:
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I do it as much I can , but somtimes I just forget , but its very important to do it otherwise you will blow your turbo esp if its re-mapped?? Mine isnt mapped still do it anyway!! :cool:
Then surely give a sh!t? Turbo blows surely thats why you have a warrenty
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I do it as much I can , but somtimes I just forget , but its very important to do it otherwise you will blow your turbo esp if its re-mapped?? Mine isnt mapped still do it anyway!! :cool:
Then surely give a sh!t? Turbo blows surely thats why you have a warrenty
Not sure what your getting at?? warentys run out also mapped cars are not covered under warrenty's. VW would never cover a blown turbo on warrenty if its mapped??
Lets just say its good practice to let the engine run for a couple of mins after sprited drive!! :cool:
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Not sure if thats needed on the TDIs :undecided:
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Not sure if thats needed on the TDIs :undecided:
Hi Alan , can you enlighten me more on this then with Diesel's? Thanks Steve
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I think I'll start doing it then, no harm in it.
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I'm not sure if the GTI engine keeps oil circulating through the turbo for a while after switching off? Maybe someone can confirm this.
But to clarify this a bit, you want to be doing what is best to remove as much heat from the turbo as possible before switching off - particularly after a long or hard run. Heat soak into the turbo housing, bearings, scroll etc is what you want to minimise as it can degrade oil leaving deposits which can affect bearing life. Even on a short run the turbo will spool up very quickly to 80,000rpm plus each time you accelerate, so that short trip and stop-start driving can be just as hard on it.
The main mechanism for dissipating heat from the turbo bearings is the flow of engine oil. So driving the car sensibly for the last few miles gives the turbo time to cool down before you switch off and cut the oil flow. Leaving it to idle for a while after stopping would also be helpful if you've just come off a track after a couple of laps, as it obviously keep the oil flowing (and thus cooling) for longer.
A re-mapped car means higher boost pressure, higher air temperature in the turbo and more load on the bearings, so it does become a bit more important to treat it nicely.
Having said all that the fully synthetic oil VW specify is designed to survive the high temperatures experienced after engine shut down with minimum deterioration. Personally I just drive it normally for the last few miles of a long journey.
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I'm not sure if the GTI engine keeps oil circulating through the turbo for a while after switching off? Maybe someone can confirm this.
The MK5 does indeed have this so I would imagine the MK6 does aswell, however it still suggested you do this "cool down" on a remapped car. What harm does 20 seconds do . .
Not sure if thats needed on the TDIs :undecided:
Hi Alan , can you enlighten me more on this then with Diesel's? Thanks Steve
Im not really your man with diesel, hence me saying Im not really sure its needed on the TDIs, Im sure I heard this somewhere but cant confirm. Your best bet would be to ask either StevePD or Rhyso who no a decent amount on the VAG diesel engines.
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This is from the VW self study program for the 2.0 litre TSI motor (VW America):
Engine Cooling System
The engine uses a cross-flow cooling system. Engine
coolant first flows to the front of the engine from
the coolant pump. The coolant is then distributed
along ducts and circulates around the cylinders. After
circulating through the cylinder head, the coolant
is routed back to the radiator via the thermostat
housing or recirculated through the coolant pump if
the thermostat is closed.
The heat exchanger and turbocharger are part of
the engine cooling circuit. The engine oil cooler is
connected directly to the cylinder block through its
mounting subframe.
After-Run Coolant Pump V51 protects the
turbocharger bearings from overheating after engine
shut-off.
The pump is activated by the engine control module
based on programmed characteristic maps
I'd still give it 20-30 secs after a hard run as turbos get super hot. The exhaust gases at idle would provide an initial cool down before shut off
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We are talking about our pride & joy's here , best practice look after what you have, and leave it to idle for a minute!! I'm going to do an oil change soon cars done 23,00 miles now!! just a littel TLC :cool:
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I'm going to do an oil change soon cars done 23,00 miles now!!
lol ! Blimey thats half way off me already ! catching me slowly :D
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I'm going to do an oil change soon cars done 23,00 miles now!!
lol ! Blimey thats half way off me already ! catching me slowly :D
Im a bit slow Alan lost me there mate?? :grin:
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I'm not sure if the GTI engine keeps oil circulating through the turbo for a while after switching off? Maybe someone can confirm this.
The MK5 does indeed have this so I would imagine the MK6 does aswell, however it still suggested you do this "cool down" on a remapped car. What harm does 20 seconds do . .
Not sure if thats needed on the TDIs :undecided:
Hi Alan , can you enlighten me more on this then with Diesel's? Thanks Steve
Im not really your man with diesel, hence me saying Im not really sure its needed on the TDIs, Im sure I heard this somewhere but cant confirm. Your best bet would be to ask either StevePD or Rhyso who no a decent amount on the VAG diesel engines.
Diesels still have turbo's Alan and the same practice applies :tongue: Don't forget the TDI turbo's in standard form run higher levels of boost so IMO its even more necessary
As everyone has pretty much said just take the last couple of miles to your destination steady and you'll be fine and your turbo will live a long and happy life :laugh: :laugh:
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The MK5 does indeed have this so I would imagine the MK6 does aswell, however it still suggested you do this "cool down" on a remapped car. What harm does 20 seconds do . .
That's a coolant pump though, isn't it?
Sure coolant keeps glowing to give equal cooling of the bearing housings (helps to prevent warping) but if you stop a petrol engine dead, with the turbo glowing red hot, you will cook the oil pretty soon after (even most synthetics), leading to deposits which can block small oilways and kill bearings.
As has been said, just give it less right foot for the last few miles, if you live in a housing estate it's easy...by the time you get from the main road to your driveway it'll have cooled down massively, give it a few seconds at idle, then turn it off. Job done.
Im not really your man with diesel, hence me saying Im not really sure its needed on the TDIs, Im sure I heard this somewhere but cant confirm. Your best bet would be to ask either StevePD or Rhyso who no a decent amount on the VAG diesel engines.
Diesel engine EGTs and turbo temperatures are way less than those of a petrol, so it's not *as* important.
Still good practice, but you'll struggle to get a diesel engine turbo glowing red, as you can a petrol engine turbo....so it's far more important on a petrol engine turo.
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Diesels still have turbo's Alan and the same practice applies :tongue: Don't forget the TDI turbo's in standard form run higher levels of boost so IMO its even more necessary
Diesels may run higher boost levels due to the ignition process, but it's irrelevant...boost is not related to bearing heat.
Boost is more related to compressor trim, and affects the charge air circuit far more than the lube oil circuit of the engine.
A decent oil flowing through a modern engine will cool the bearings with roughly the same temperature of oil whether the turbo is producing 0.5 bar of pressure, or 2.0 bar of pressure, so as long as the oil is kept flowing, it remains roughly the same temperature...the turbo's turbine housing gets hot (sometimes red hot), and the compressor housing gets hot due to work done (and conduction) but the oil temperature is largely unaffected.
You keep the oil flowing, you keep the bearings from overheating. Simples.
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Im a bit slow Alan lost me there mate?? :grin:
You have done some real mileage in that thing to get to 23k already. I was just saying you have done half the mileage of my car already ;)
Diesel engine EGTs and turbo temperatures are way less than those of a petrol, so it's not *as* important.
Still good practice, but you'll struggle to get a diesel engine turbo glowing red, as you can a petrol engine turbo....so it's far more important on a petrol engine turo.
And Rhys, no one likes a smart ass ok ;) :D
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Im a bit slow Alan lost me there mate?? :grin:
You have done some real mileage in that thing to get to 23k already. I was just saying you have done half the mileage of my car already ;)
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He's only done 2300 miles :tongue: Read it again :wink:
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OH FFS IM GOING TO BED !
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OH FFS IM GOING TO BED !
:laugh: :laugh: brilliant and it's good night from him!!
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:laugh: :laugh: brilliant and it's good night from him!!
:laugh:
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Im back at work now so watch yourselves ;)
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:grin:
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I have had a couple of turbos both petrol or diesel, always drove the last few miles off boost, it all helps.