Are the stock twin turbos water or oil cooled???
#1
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Are the stock twin turbos water or oil cooled???
Hello all! I tried searching already and could not find the answer so please just a simple answer will do for me instead of telling me to use the search function again. I obviously don't have an FD or I would just pop the hood and look. So are the stock twins water or oil cooled? If they are water cooled, there's no need for a turbo timer right? Thank you!
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water cooled..and turbo timers are worthless. (this right from the mouth of a well known RX7 mechanic/tuner I will not name so as to protect him from flammage).
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both? so they have oil feed lines as well as water lines through them? I was under the impression that any turbo cooled by oil "SHOULD" ideally use turbo timers to prevent oil cooking during shut off but the guy above said it's worthless
#6
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Originally Posted by rx7onfire
So tell me why turbo timers are worthless?
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so say if we were to upgrade to an aftermarket single turbo setup, we can get one that's 100% water cooled right so then we could just block of the stock oil lines?
#10
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Originally Posted by SpeedKing
He will tell you to drive without boost a couple miles or so from your destination, then shut it off when you get there, hence no need for a turbo timer to idle the car. However, not everyone has the patience or is soft-of-foot to always do that.
To add to this, letting the car sit up and idle does nothing to cool the car down (especially the oil coolers). You need the air flow. After I drag my car, I always take a short little drive as soon as I finish my run(no boost). The engine coolant & oil will cool down much faster this way. Also carbon build-up is accelerated while the engine is idleing.
Last edited by t-von; 06-29-05 at 02:22 AM.
#11
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Originally Posted by SpeedKing
He will tell you to drive without boost a couple miles or so from your destination, then shut it off when you get there, hence no need for a turbo timer to idle the car. However, not everyone has the patience or is soft-of-foot to always do that.
I always drive slow for the last 2 mile stretch before I get home. That is if i'm not driving slow already.
#12
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Originally Posted by live2drive15
I always drive slow for the last 2 mile stretch before I get home. That is if i'm not driving slow already.
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nah if the motor blows, then I'll just throw in a street ported rebuilt one and drive faster
anyway, yeah I never understood the point of the turbo timer even when I had it on my old Audi...if there's no incoming air then sitting there idling would increase engine temps rather than lowering them. I know that it's to prevent the oil that's sitting in the turbo from cooking itself when you turn it off hence the reason the engine is kept running to circulate it but wow what can 1-2 minutes do...it'll still cook the oil after the timer turns the engine off cuz after hard driving, those turbos glow a faint orange...would need at least an hour to cool down if not more.
anyway, yeah I never understood the point of the turbo timer even when I had it on my old Audi...if there's no incoming air then sitting there idling would increase engine temps rather than lowering them. I know that it's to prevent the oil that's sitting in the turbo from cooking itself when you turn it off hence the reason the engine is kept running to circulate it but wow what can 1-2 minutes do...it'll still cook the oil after the timer turns the engine off cuz after hard driving, those turbos glow a faint orange...would need at least an hour to cool down if not more.
Last edited by FormulaRX; 06-29-05 at 03:02 AM.
#15
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Originally Posted by twinturborx7pete
yes they have both lines running through them. You don't really need a turbo timer if you drive smoothly before you shut it down.. idling for a long time isn't good for any car.. all you are doing is increasing the underhood temps
Originally Posted by turbojeff
Only if you have some magic stuff that allows the turbo to spin a 100,000+ rpm without any lube.
Even if oil cooled, what is the point of idling a car to try and cool the turbos? AS stated, it just increase underhood temps....and don't you finally have to shut it off at some point???
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Does an "Oil Cooled" turbo even exist? They are all oil lubricated, and some are water cooled.
Car manufacturers almost always water cool thier turbos, to aid in turbo life, but water cooling is not needed... just nice to have.
Car manufacturers almost always water cool thier turbos, to aid in turbo life, but water cooling is not needed... just nice to have.
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I might be off the mark a bit here, but I was under the impression that the turbos require a finite time to spin down after boosting. I have no idea how much time that is, but apparently it's a little while, long enough to damage the turbos if the oil is not flowing.
I thought boosting, then shutting down the engine straight away (without idling or gentle driving) could leave the turbos still spinning after shutdown, but with no oil/coolant flowing. This could lead to overheating and coking the oil.
Not saying this is how it is, because I'm not sure, just throwing it out for comment.
Here, I found one site that has this info posted on it so I know that I'm not making stuff up.
http://www.majesticturbo.com/glossary.html
I thought boosting, then shutting down the engine straight away (without idling or gentle driving) could leave the turbos still spinning after shutdown, but with no oil/coolant flowing. This could lead to overheating and coking the oil.
Not saying this is how it is, because I'm not sure, just throwing it out for comment.
Here, I found one site that has this info posted on it so I know that I'm not making stuff up.
http://www.majesticturbo.com/glossary.html
hot shut down:
At idle, your turbo is turning thousands of RPMs per minute; after running your vehicle, even for just a few minutes, you want to let the motor and turbo “idle down” with cool oil circulating through it; failure to do this causes the turbo to remain spinning (after the vehicle is switched off), with no oil supply circulating through it, causing “coking up” of hot oil on the turbo parts, leading to turbo failure. Oil line(s) feeding the turbo will also coke up, much like stopped up arteries of the heart. This is why, after we rebuild your turbo, we ask that you replace oil line(s) that feed the turbo.
At idle, your turbo is turning thousands of RPMs per minute; after running your vehicle, even for just a few minutes, you want to let the motor and turbo “idle down” with cool oil circulating through it; failure to do this causes the turbo to remain spinning (after the vehicle is switched off), with no oil supply circulating through it, causing “coking up” of hot oil on the turbo parts, leading to turbo failure. Oil line(s) feeding the turbo will also coke up, much like stopped up arteries of the heart. This is why, after we rebuild your turbo, we ask that you replace oil line(s) that feed the turbo.
#19
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majestic note is for oil cooled turbos. translation: let it idle 30 sec to let rpms drop, but better to let is idle several minutes to cool the very hot center housings, and avoid coking.
My thermocouple tests on an oil cooled turbo showed cool down idle was much more effective if one of the rad fans was blowing air across the turbo area while idling.
Oil only turbos use a large flow of oil through center housing cavities for cooling. For water cooled tubos, water fills and flows through the cavities, and oil flow is restricted, and does less cooling.
Turbo times are not very effective with FD's, unless fans are blowing some air across turbos. This is beacuse very little water flows through the tubos at idle, since the supply line port is near the return line port at the WP hsg.
My thermocouple tests on an oil cooled turbo showed cool down idle was much more effective if one of the rad fans was blowing air across the turbo area while idling.
Oil only turbos use a large flow of oil through center housing cavities for cooling. For water cooled tubos, water fills and flows through the cavities, and oil flow is restricted, and does less cooling.
Turbo times are not very effective with FD's, unless fans are blowing some air across turbos. This is beacuse very little water flows through the tubos at idle, since the supply line port is near the return line port at the WP hsg.
#20
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Originally Posted by FormulaRX
Hello all! So are the stock twins water or oil cooled? If they are water cooled, there's no need for a turbo timer right? Thank you!
A turbo timer is not needed & as previously posted will not actually "cool" down the car or turbos. The longer your car runs the hotter it will get due to lack of airflow (until your fans kick on)
In the old days turbos were not water cooled & the housing would glow red hot for a long time. If you shut down the motor with "hot" turbos the oil would boil away & coke up the oil passages. Lack of lube would seize/score the turbo bearings.
Fast forward to modern times......
Water cooled housing & synthetic oil. Both keep the oil from cokeing & clogging the passages.
Yes, you shouldn't shut down your motor after a 1/4 mile run or fast laps on the track. As stated numerous times, prior to arriving at your destination. Drive without boosting for 3-5 minutes.
As far as your turbos needing time to "spool down". Pull your "Y" pipe or intercooler pipe off. Start your car.
Damn, them little suckers are spinning away at idle. Granted they arn't going 100K rpms, but they are in motion.
Last edited by Sled Driver; 06-29-05 at 06:53 PM.
#21
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Couldn't have said it better myself.
With water cooled turbos you do not need a turbo timer.
Originally Posted by Sled Driver
The turbos are water cooler & oil lubricated.
A turbo timer is not needed & as previously posted will not actually "cool" down the car or turbos. The longer your car runs the hotter it will get due to lack of airflow (until your fans kick on)
In the old days turbos were not water cooled & the housing would glow red hot for a long time. If you shut down the motor with "hot" turbos the oil would boil away & coke up the oil passages. Lack of lube would seize/score the turbo bearings.
Fast forward to modern times......
Water cooled housing & synthetic oil. Both keep the oil from cokeing & clogging the passages.
Yes, you shouldn't shut down your motor after a 1/4 mile run or fast laps on the track. As stated numerous times, prior to arriving at your destination. Drive without boosting for 3-5 minutes.
As far as your turbos needing time to "spool down". Pull your "Y" pipe or intercooler pipe off. Start your car.
Damn, them little suckers are spinning away at idle. Granted they arn't going 100K rpms, but they are in motion.
A turbo timer is not needed & as previously posted will not actually "cool" down the car or turbos. The longer your car runs the hotter it will get due to lack of airflow (until your fans kick on)
In the old days turbos were not water cooled & the housing would glow red hot for a long time. If you shut down the motor with "hot" turbos the oil would boil away & coke up the oil passages. Lack of lube would seize/score the turbo bearings.
Fast forward to modern times......
Water cooled housing & synthetic oil. Both keep the oil from cokeing & clogging the passages.
Yes, you shouldn't shut down your motor after a 1/4 mile run or fast laps on the track. As stated numerous times, prior to arriving at your destination. Drive without boosting for 3-5 minutes.
As far as your turbos needing time to "spool down". Pull your "Y" pipe or intercooler pipe off. Start your car.
Damn, them little suckers are spinning away at idle. Granted they arn't going 100K rpms, but they are in motion.
#23
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Some guy tried to tell me that I was a fool for not having a turbo timer in my FD... I got frustrated trying to explain at first and ended up laughing.
He said" if you don't have a turbo timer you'll cook your turbos"
anyhow, your questions have been answered!! so no point in me saying things again
He said" if you don't have a turbo timer you'll cook your turbos"
anyhow, your questions have been answered!! so no point in me saying things again
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Originally Posted by brancato1
Does an "Oil Cooled" turbo even exist? They are all oil lubricated, and some are water cooled.
Car manufacturers almost always water cool thier turbos, to aid in turbo life, but water cooling is not needed... just nice to have.
Car manufacturers almost always water cool thier turbos, to aid in turbo life, but water cooling is not needed... just nice to have.
Last edited by RoadRaceJosh; 06-29-05 at 09:46 PM. Reason: clarity