Burn UP My Turbo?
Registered User
Joined: Nov 2002
Posts: 1,780
From: San Diego
Car Info: Boosted Geo Prizm
There is no warm up procedure or cool down procedure, PERIOD.
If car's were manufactured with this in mind, it would have been stated in your manual. Cars for the american market, sadly are built for idiots. We're too content with low NVH, comfy seats, soft suspensions, and good gas mileage.... If we now had to wait a few minuted to bring the engine up to operating temps, or had to wait to cool down the engine, no one would buy a subaru in america.
If car's were manufactured with this in mind, it would have been stated in your manual. Cars for the american market, sadly are built for idiots. We're too content with low NVH, comfy seats, soft suspensions, and good gas mileage.... If we now had to wait a few minuted to bring the engine up to operating temps, or had to wait to cool down the engine, no one would buy a subaru in america.
Guest
Posts: n/a
I disagree.
The heat generated through the turbo is intense. (check out web sites for building a jet engine... they use old turbos and they turn red). If you were to just shut the car off, therefore stopping the lubrication flow, the hot parts would sit still and bake... which is not good for the bearings. A friend of mine drives an Audi and I have seen his turbo glow red hot after some heavy driving.
Most people I know let their cars and trucks with turbos run for 3-5 minutes after trips of 20 minutes or longer.
http://www.junkyardjet.com/turbinefaq.html see here for the jet engine.
The heat generated through the turbo is intense. (check out web sites for building a jet engine... they use old turbos and they turn red). If you were to just shut the car off, therefore stopping the lubrication flow, the hot parts would sit still and bake... which is not good for the bearings. A friend of mine drives an Audi and I have seen his turbo glow red hot after some heavy driving.
Most people I know let their cars and trucks with turbos run for 3-5 minutes after trips of 20 minutes or longer.
http://www.junkyardjet.com/turbinefaq.html see here for the jet engine.
Registered User
Joined: Nov 2002
Posts: 1,780
From: San Diego
Car Info: Boosted Geo Prizm
Originally posted by shark80
I disagree.
The heat generated through the turbo is intense. (check out web sites for building a jet engine... they use old turbos and they turn red). If you were to just shut the car off, therefore stopping the lubrication flow, the hot parts would sit still and bake... which is not good for the bearings. A friend of mine drives an Audi and I have seen his turbo glow red hot after some heavy driving.
Most people I know let their cars and trucks with turbos run for 3-5 minutes after trips of 20 minutes or longer.
http://www.junkyardjet.com/turbinefaq.html see here for the jet engine.
I disagree.
The heat generated through the turbo is intense. (check out web sites for building a jet engine... they use old turbos and they turn red). If you were to just shut the car off, therefore stopping the lubrication flow, the hot parts would sit still and bake... which is not good for the bearings. A friend of mine drives an Audi and I have seen his turbo glow red hot after some heavy driving.
Most people I know let their cars and trucks with turbos run for 3-5 minutes after trips of 20 minutes or longer.
http://www.junkyardjet.com/turbinefaq.html see here for the jet engine.
If Subaru felt the turbo would need to run after shutdown, it would have made proviions for it. Who are you to say that Subaru is wrong?
Now go to a larger turbo, then I will change my story. But stock for stock even on mild boost, your just fine without it. But if you feel the need for $100 in protection, more power to you. Better safe then sorry right?
Guest
Posts: n/a
Easy... I am not trying to say Subaru is wrong. I am just using my experience and the experience of my friends who rebuild engines for a living. I have seen guys build the jet engines and even with water cooling they still get hot. I do know that the turbos on older Chryslers burned out often because of poor oil flow. They even recalled some and replaced oil lines to increase the flow. I think engineers (even in the 80's) know that the bearings in turbos need oil flow to reduce friction and heat.
I will be the first to admit that I do not have the intimate knowledge of Subaru engines that others at this site have. But I know when I shut my engine off there is no stock electric oil or water pump moving fluids through the turbo. If there is I can't hear it.
From my experience it is better to allow the turbo time to cool before shutting it down.
I will be the first to admit that I do not have the intimate knowledge of Subaru engines that others at this site have. But I know when I shut my engine off there is no stock electric oil or water pump moving fluids through the turbo. If there is I can't hear it.
From my experience it is better to allow the turbo time to cool before shutting it down.
Registered User
Joined: Nov 2002
Posts: 1,780
From: San Diego
Car Info: Boosted Geo Prizm
It's cool.
The subaru coolant system works off of pressure generated from the heat of the turbo. That is what moves coolant in and out of the turbo after you shut it down.
The subaru coolant system works off of pressure generated from the heat of the turbo. That is what moves coolant in and out of the turbo after you shut it down.
Guest
Posts: n/a
I believe it's pretty much agreed on this forum that you should stay out of boost until your engine is properly warmed up.
Personally I let my car idle for a couple of minutes before driving off to help it along but now summer is here I might not bother.
Personally I let my car idle for a couple of minutes before driving off to help it along but now summer is here I might not bother.
Guest
Posts: n/a
Funny... "It's cool"
Interesting... like I said, I don't know too much about Subaru engines. I am used to working on Chevy 350s.
If you could email me more info on how this works I would appreciate it. I'm always interested to learn.
epribula@hotmail.com
Interesting... like I said, I don't know too much about Subaru engines. I am used to working on Chevy 350s.
If you could email me more info on how this works I would appreciate it. I'm always interested to learn.
epribula@hotmail.com
Registered User
Joined: Dec 2002
Posts: 287
From: San Diego
OK, so now I have a question..its totally off topic from the initial thread but everytime I post it no one responds and you guys seem to know what your talkin about. I just finished my exterior/handling mods and im now starting to do engine upgrades. I bought a VS0, defi gauges (boost, oil, egt), greddy catback, and im currently trying to get my hands on a vf30. I just wanted to know what boost levels to set my car at. I think (not sure) the VSO tunes the chip for 15.5+/- but should I up the boost since im getting a vf30? I read on some post that different gears have diff. boost levels, i wanted to know how you set that. Im having a friend install all my stuff and he has alot of knowledge on subaru components but I just wanted to know what the safe boost levels would be. I want my car to GO...but its a daily driver car also. By the way, my gauges are in SI units so that should be a pain also...
Registered User
Joined: Jun 2003
Posts: 173
From: New York
Car Info: 2002 WRX wagon
When I checked with the service manager at the dealer where I bought my 02 WRX I was told no cool down needed. But, I am sure also meant no "hot laps" before shut off. A friend who had a little 3-cyl suzuki with a turb. advices a minute of two of cool down. My tech for my other cars also said: coast along for a 1.4 mile or so before shut off. You pays your money........
Registered User
iTrader: (12)
Joined: Nov 2002
Posts: 440
From: bay area, CA
Car Info: 02 WRX wgn full STI swap
well... hmmm....
At first I thought you guys were a little off about the cool down thing...
After searching through the manual, I found nothing about idleing the engine for any time before shutting it off... It say not to shut if off unless it's idleing, but that's as close as it got.
My 92 MR2 turbo manual specifically said to idle the engine for 60-120sec after lots of uphill driving or a "spirited" run. Most MR2 turbos start to die after about 70,000 miles (seeping oil and lower boost) unless better taken care of. My car was driven REALLY hard for 110k and the turbo still topped off the boost gauge in stock trim. I was always convinced that it was because I religously cooled it down by letting it idle for a minute or two before turning it off.
As for the WRX. I can tell you this:
I drive up a local hwy at night very often. 8 miles and a 2000ft climb with lots of tight corners. Whenever I get to the parking lot I pop the hood and watch my turbo glow RED hot.
-Turn the car off right away and the turbo stays red for a long time.
-Leave the car idle and the turbo cools to a nice subbtle burgundy grey in about three to four minutes...
I will continue to let my car idle for a few minutes after anything more than mild driving.
Ash
After searching through the manual, I found nothing about idleing the engine for any time before shutting it off... It say not to shut if off unless it's idleing, but that's as close as it got.
My 92 MR2 turbo manual specifically said to idle the engine for 60-120sec after lots of uphill driving or a "spirited" run. Most MR2 turbos start to die after about 70,000 miles (seeping oil and lower boost) unless better taken care of. My car was driven REALLY hard for 110k and the turbo still topped off the boost gauge in stock trim. I was always convinced that it was because I religously cooled it down by letting it idle for a minute or two before turning it off.
As for the WRX. I can tell you this:
I drive up a local hwy at night very often. 8 miles and a 2000ft climb with lots of tight corners. Whenever I get to the parking lot I pop the hood and watch my turbo glow RED hot.
-Turn the car off right away and the turbo stays red for a long time.
-Leave the car idle and the turbo cools to a nice subbtle burgundy grey in about three to four minutes...
I will continue to let my car idle for a few minutes after anything more than mild driving.
Ash
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Thank you ASH, I knew I wasn't crazy.
The company I worked for used Ford turbo diesel trucks and we would let them warm up 10-15 minutes (especially since they were diesel). After a drive to the job site (usually 1 to 1.5 hours) we would let them cool for 10-20 minutes due to the turbo. The times were weather dependent.
I searched for a start up and shut down procedure as well and could not find one either. I am surprised that they would not suggest something like that unless they had an electric circulation pump for the oil and water that would circulate fluid after the motor was shut off. I can't say that I understand the vacuum method of cooling that teviaboy was talking about.
Based on my past experience and the tales of gunk filled turbos (due to oil baking after shutoff) going bad I plan to let my WRX cool as long as I own it.
The company I worked for used Ford turbo diesel trucks and we would let them warm up 10-15 minutes (especially since they were diesel). After a drive to the job site (usually 1 to 1.5 hours) we would let them cool for 10-20 minutes due to the turbo. The times were weather dependent.
I searched for a start up and shut down procedure as well and could not find one either. I am surprised that they would not suggest something like that unless they had an electric circulation pump for the oil and water that would circulate fluid after the motor was shut off. I can't say that I understand the vacuum method of cooling that teviaboy was talking about.
Based on my past experience and the tales of gunk filled turbos (due to oil baking after shutoff) going bad I plan to let my WRX cool as long as I own it.
Guest
Posts: n/a
in older turbos and some newer ones....you still need to cool them. they use exhaust gas to cool the oil. if you just shut it off the oil boils resulting on the formation of COKE...coke is a white crusty powder that will end up killing the spinning surfaces of the turbo. the WRX uses a cool *** concept that cools itself by circulating coolent under pressure from the boiling oil....it does this and since the oil cools......NO COKE!!!!
here's a link.......it gives the basic rundown why you don't need a turbo timer.
http://www.endwrench.com/current/win...03/insider.pdf
here's a link.......it gives the basic rundown why you don't need a turbo timer.
http://www.endwrench.com/current/win...03/insider.pdf
Last edited by jriggs; Jun 20, 2003 at 11:02 AM.