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Old 01-08-2003, 06:24 PM   #1
merlot
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Question So a Subaru mechanic tells me I should buy a Turbo Timer...

I was at the dealer today having something checked out, and in casual conversation the mechanic asked if I let the car idle after driving hard. I said no, I've read it's not needed.

After telling him I read a document from Subaru (does someone have the link?) about the how turbo still cools down after the engine is off, he and the service writer joked about how I got the info from the internet and most is not reliable. His reasoning was if the car isn't running, the oil pump is pumping oil and the water pump is pumping water, so how could the turbo get cooler.

I wish I was more techincally inclined and could remember extactly what the document contained. I'm sure someone here has a copy or the link at least. I'd like to print it out and bring it to them next time I'm there.

One part he did seem to know was to wait till 10,000 miles for synthetic... exactly what Subaru told me when I called them.

Any thoughts?

MSD
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Old 01-08-2003, 06:37 PM   #2
pegdrgr
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Due to a small reservoir above the turbo you do not have to wait for it to cool down completely, however it will not hurt to use a turbo timer, or let the car cool down. The mechanic is probably not that familiar with the WRX and just being cautious. I would view his comment about the TT as generically good for turbo cars, not necessarily ideal for yours.
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Old 01-08-2003, 06:42 PM   #3
merlot
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Thanks for the reply... I found what I was looking for

http://www.subaruwest.com/PDF_files/...1_techtips.pdf

MSD
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Old 01-08-2003, 06:56 PM   #4
SuicidalLabRat
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"2002MY WRX TURBO COOL DOWN PROCEDURE
FHI's posistion regarding this is that it is not necessary to perform a "cool down/idling" procedure, as was recommended with past turbo models. Our current 2.0L turbo engine has a far greater cooling capacity and, coupled with technology advances, makes this practice no longer necessary. This explains why information about cool down is not included in the 2002MY Impreza Owner's Manual.

The heat contained in the turbo charger will begin to vaporize the coolant at the turbo charger after the engine is stopped. This hot vapor will then enter the coolant reservoir tank which is the highest point of the coolant system. At the same time the vapor exits the turbo charger, coolant supplied from the right bank cylinder head flows into the turbo. This action cools the turbo charger down. This process will continue until the vaporizing action in the turbo charger has stopped or cooled down."




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Old 01-08-2003, 07:48 PM   #5
warlord225
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what about the oil though?
i know the turbo uses oil as a bearing, so essentially by not idling the car down you are "cooking" the bearing due to the fact that the oil is sitting on a very hot surface, just look at an egg frying in a pan of oil.
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Old 01-08-2003, 07:53 PM   #6
lstepnio
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I was under the impression that the oil drains out of the turbo once the oil pump stops.
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Old 01-08-2003, 09:13 PM   #7
LyveWRX
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Default I hope not....

"I was under the impression that the oil drains out of the turbo once the oil pump stops."

I hope not all of it, darn that would be bad, the thin film left would definately coke during heat soak, and then there would be metal on metal for startup....

Nick
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Old 01-08-2003, 09:51 PM   #8
Chrisnonstop
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Default 36K miles so far no problems

I drive 100 miles a day to and from work (Marin to Livermore, ca). During this trip the RPM speed averages about 3400 - 4000 depending on how fast i'm going. Usually about 85MPH. The fastest is around 110 (0520hrs with nobody on the road). This has been done 5 days a week since I got the car about 14 months ago. So far there has been no loss of power, and no odd noises. I do let the car idol for 30 seconds before shutting it off. Only because the mechanic at SUbaru told me to do this to help avoid throwing any CEL's. This was back when I was using cheap gas and kept throwing CEL's. We were a little stumpt as to why I was throwing the CEL's so the mechanic said, Use good gas, & let the car idol 30 seconds before shutting it off. I guess a TT would be good if it was a track car and for some odd reason you liked to race it near red line all day, come to a screaching hault and shut the engine off...just kidding.

Honestly though, it's been 36K miles, if my turbo was going to cook the oil it would have done it already. When I hit 80K miles post another message here to let the masses know if my turbo burnt up yet. If it hasn't by then, that's gotta be proof you don't need a TT. Unless your the type of drive described above and torture your car. Then not only do you need a TT, you also need a psychiatrist....

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Old 01-08-2003, 11:38 PM   #9
SuicidalLabRat
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Where did this impression that turbine idle down is to cool the turbo? The necessity of settling the turbo is to allow the impeller to slow to idle while its flow oiled; if you are not on boost for a minute or two before stopping, i.e. you may have been running it hard on the freeway, you exited and cruzed the few blocks to your house before cutting the engine, then there is no need for a TT regardless of whether your turbo is glowing or not. You arent bringing a 1700 F housing down to some magic safe temperature by not boosting for a thirty second TT session, its an iron e-side, it holds heat pretty well. The suby voodoo post stall cooling mechanism seems to be more to cool quicker and offset coking.



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Old 06-14-2006, 01:58 PM   #10
biogon
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I know this is bring up a REALLY OLD post.

I've been driving my '05 WRX for a while now and worried about the turbo. A friend of mine with an old Supra TT always was a big proponent of his turbo timer.

So I called the Subaru dealer I bought my Woobie from and asked their service people.

Their reply?

"Let it cool down by idling for 10 minutes every time you drive it."

Oh, thanks.

Right.

You guys are the best.
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Old 06-14-2006, 02:05 PM   #11
offset
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Please make sure to avoid that Subaru dealership for service then.

offset
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Old 06-14-2006, 05:13 PM   #12
sedanman10
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^^^^^^^^^^^^^wise words. If something ever goes wrong with your turbo, your car is telling you that its bored and time for an upgrade!
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Old 06-14-2006, 07:15 PM   #13
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if the turbo was oil-cooled then you'd be advised to use one. i used to have one mainly for the bling factor, but i sold it since it's not necessary. used that money for bushings!
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