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"Always warmed up and cooled down"

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Old Dec 6, 2013 | 05:14 PM
  #31  
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Originally Posted by GotBoost?
Warming up improves the viscosity of the motor oil, thus reduces premature engine wear. Moreover, the engine needs warming up to let the pistons and piston rings expand to normal size. I was expecting this was common sense.

Re cooling down: turbo wheels normally use a simple friction bearing which is lubricated by engine oil. If one was to park his cat with a sizzling red glowing hot turbo bits of oil remaining in the bearing will end up charred and build up residues which eventually will lead to premature turbo failure
There is your answer Tony
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Old Dec 6, 2013 | 05:25 PM
  #32  
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Originally Posted by GotBoost?
Warming up improves the viscosity of the motor oil, thus reduces premature engine wear. Moreover, the engine needs warming up to let the pistons and piston rings expand to normal size. I was expecting this was common sense.

Re cooling down: turbo wheels normally use a simple friction bearing which is lubricated by engine oil. If one was to park his cat with a sizzling red glowing hot turbo bits of oil remaining in the bearing will end up charred and build up residues which eventually will lead to premature turbo failure
I think this is a valid point with oil carbonising up in the turbo by not having the flow when still hot. I would have thought though that with modern synthetic oils this is also a thing of the past. I'm sure i've read somewhere that our turbos are still being cooled even though the engine is switched off. I believe it had something to do with a syphon effect. Not an expert on this so will stand corrected if someone has more techy info to put forward.
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Old Dec 6, 2013 | 05:33 PM
  #33  
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Originally Posted by Steve Whitehorn
There is your answer Tony
Advert was for a nasp car, but I see your point.
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Old Dec 6, 2013 | 05:37 PM
  #34  
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Some turbos are water cooled IIRC. The eom one on my GTST was water cooled.
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Old Dec 6, 2013 | 06:08 PM
  #35  
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Originally Posted by tony de wonderful

Advert was for a nasp car, but I see your point.
Given that you were posting on a Subaru board and mentioning turbo timers I was expecting thus academic discussion to be about forced induction
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Old Dec 6, 2013 | 06:09 PM
  #36  
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Originally Posted by tony de wonderful
Some turbos are water cooled IIRC. The eom one on my GTST was water cooled.
Yes, some modern ones are. But not all of them
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Old Dec 6, 2013 | 06:12 PM
  #37  
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Originally Posted by GotBoost?
Given that you were posting on a Subaru board and mentioning turbo timers I was expecting thus academic discussion to be about forced induction
Not all subarus are turbo.
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Old Dec 6, 2013 | 06:15 PM
  #38  
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We all know but Scoobynet is made of 95% WRX and STI owners I suppose.
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Old Dec 6, 2013 | 07:23 PM
  #39  
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Originally Posted by chopperman
The owners handbook clearly states about not using excessive revs ect until the engine is up to temp. It says absolutely nothing about letting the car idle before switching off.
]

No but on UK Turbo 2000's there is a sticker on the drivers door which states after heavy highway driving you should allow the engine to idle for one minute before turning off. I think they mean a long hard blast to a sudden stop like a petrol station. It doesn't say why but Subaru wouldn't go to the trouble of making the sticker and then sticking it right in the drivers view for no reason.

I have done about 60,000miles over 7 years in my scoob and always let it warm up about a minute before setting off and mostly let it idle a minute before turning off. Unless I come home late at night when I coast down the hill towards my house (yes bad for car control etc) but does the same job and stops the neighbours being woken up. Probably all over kill but why not.

Last edited by FMJ; Dec 6, 2013 at 07:24 PM.
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Old Dec 6, 2013 | 08:08 PM
  #40  
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Originally Posted by FMJ
]

No but on UK Turbo 2000's there is a sticker on the drivers door which states after heavy highway driving you should allow the engine to idle for one minute before turning off. I think they mean a long hard blast to a sudden stop like a petrol station. It doesn't say why but Subaru wouldn't go to the trouble of making the sticker and then sticking it right in the drivers view for no reason.

I have done about 60,000miles over 7 years in my scoob and always let it warm up about a minute before setting off and mostly let it idle a minute before turning off. Unless I come home late at night when I coast down the hill towards my house (yes bad for car control etc) but does the same job and stops the neighbours being woken up. Probably all over kill but why not.
I didn't know that No such sticker on my newage but you should always do what the manufacture says.

Cooling down or running down like others here has never been an issue. I cant boost on the resident streets by my house, plus by the time i have revered onto my drive, swapped sunglasses for specs ect its had the time to cool off. Petrol stations is a point to consider though. I never really drive on boost for any period of time. Squirt and giggle is about it.
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Old Dec 6, 2013 | 08:52 PM
  #41  
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Subaru should have put a factory turbo timer in there then (if it isn't illegal?)?
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Old Dec 6, 2013 | 09:00 PM
  #42  
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Originally Posted by tony de wonderful
Subaru should have put a factory turbo timer in there then (if it isn't illegal?)?
Or have and electric oil pump and water pump that starts up for a period of time when the car is switched off. I dont think its a big issue for normal or even fast road use. Maybe for track use when the turbo has been on full boost for several laps and generated very high temps.
I bet the fuel used with turbo timer running time would be more than enough to buy a new turbo over the non run down turbo life span
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Old Dec 6, 2013 | 09:25 PM
  #43  
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Originally Posted by FMJ
]

No but on UK Turbo 2000's there is a sticker on the drivers door which states after heavy highway driving you should allow the engine to idle for one minute before turning off. I think they mean a long hard blast to a sudden stop like a petrol station. It doesn't say why but Subaru wouldn't go to the trouble of making the sticker and then sticking it right in the drivers view for no reason.

I have done about 60,000miles over 7 years in my scoob and always let it warm up about a minute before setting off and mostly let it idle a minute before turning off. Unless I come home late at night when I coast down the hill towards my house (yes bad for car control etc) but does the same job and stops the neighbours being woken up. Probably all over kill but why not.
The best way to warm up a subaru. Is not to let it idle. But to drive off immediately like an old man and drive very slowly with mechanical sympathy untill the oil temperatures begin to rise. A oil temp guage is a good bit of kit as it shows you when you get to a proper operating temperature ...unlike the crude water temp guages found in most cars.

Oil presure at start up is also another subject to delve into perhaps.....
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