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Discussion Starter #1
Wait until you hear about this crap!!!

So did we ever settle the debate of whether you need to leave the car on a bit after running it? I thought I read on Subaru's site at some point saying that it did it automatically so you didn't have to leave the car on, but now I can't find that. Any ideas?
 

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Good question. To my knowledge, you don't need to cool it down unless your were driving it under SEVER conditions. I think that you should probably just squirt it with the I/C spray...

I'll ask that question in July when I go to the ride and drive...
 

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Sounds like something that would have to be listed in bold in the users manual. Any people with their STi have the booklet handy?
 

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You shouldn't need a turbo timer unless you are running at the track and pull into the pits and kill it. The IC spray has nothing to do with the turbo and the possibility of frying the cooling oil....sorry murley!

I think as long as you give the car a decent cool down after really getting on her, you should be just fine without it. Modern turbo cars have designed around the problems of the first turbo cars....otherwise you'd still hear magazines and the like complaining about the reliability of turbo vehicles.
 

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I believe the tubro is water cooled so it does not really need as long of a cool down like old school turbos did. I will still let her run a little after a hard run though.
 

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Good point...forgot that part. Old turbos used engine oil for not only lubrication but cooling. But as MKIV mentioned, most of the cooling is done by the water. And from what SPD Tuning has mentioned, the water system is designed so that water continues to flow thru the turbo for several minutes after the engine has been shut down.

Anyone with their car handy care to check that out? I believe they mentioned there was a reservior that was at a higher elevation in the engine bay that allowed this.
 

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Are you guys sure the turbo in STi is water cooled? I haven’t seen that anywhere...

Even if it is oil cooled, I don't think anyone ever proved that a turbo timer extends turbine life. I was going to get it initially for my EVO, but now I am leaning against it. I think I will just let make sure I don’t turn the engine off immediately after hard-core driving.
 

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I'm gonna ask my Subie "Master Certified" mechanic real quick about the WRX's turbo. Hold on...
 

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Okay, just talked to Keith. He's the mechanic going to the STi R&D in July with me. He's been fixing Subies for like 13 or 14 years now. He said that the current WRX is at least oil cooled, and probably (without pulling one out to see) water cooled as well. Now, that's obviously not for the exhaust gases, that is air to air cooled. But for the turbo and turbine itself it's both, th thinks...
 

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Shoot it over, bud...
 

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Well I used to have a 99 Passat 1.8 Turbo and after a simple drive down the freeway the turbo would be glowing a nice brite red. I think it was only oil cooled.
So why don't you just wait till you get the car, then take a 30 min trip down the freeway at full boost and pop the hood and see what color your turbo is 8)
 

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Discussion Starter #16
ingraham said:
Well I must say BHodges your new avitar is you best so far, and most annoying
Muhahah! You think this one is bad....wait until I spread my evil avatars to all. I got one for ya right now as a matter of fact....
 

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Grab my spot in Colorado

Uh....before this gets out of hand.....I think you should change the one you have up now. That certainly isn't what I'd call a 'safe at work' image. Can ya do that for us? Thanks.
 

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why not just step and let go quicklyof the gas at 3k rpm and stop the car before let go, so the oil goes away at the split second
 

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Evo 8 Message Boards?

From the STi service manual (same as the WRX):

B: TURBOCHARGER UNIT
The turbocharger is water-cooled. It utilizes a wastegate valve to adjust its supercharging pressure to an optimum level. ...

C: LUBRICATION OF TURBOCHARGER
The turbocharger is lubricated by engine oil branched out from the oil pump. To cope with very high speed of the turbocharger turbine and the compressor shaft which may reach a maximum of several hundred thousands of rpm, full-floating type bearings are used which can form adequate oil films on their inside and outside during running. Further the oil supplied to the turbocharger also plays a role of cooling the turbine so that heat from exhaust gas does not transmitted to the bearings.

D: COOLING OF TURBOCHARGER
The turbocharger unit is cooled by engine coolant, which enhances the reliability and durability of the unit. The engine coolant from the coolant drain hose located under the cylinder head is led by a pipe to the coolant passage provided in the turbocharger bearing housing. After cooling the bearing housing, the engine coolant is led into the coolant filler tank through a pipe.
 
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