Turbo cooling?
#16
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Join Date: Sep 2010
Location: Ann Arbor area - land of the libtards
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I would never shut off mine after a hard run, including a few redline shifts and .8bar boost (tuned)...I had a b5 S4 (2.7 bi-turbo) Audi for those that don't know, these turbos blowing up where quite common, with that said I let her run for about 30 sec after driving, if I get on her hard, I drive about a mile or two before shutting off at normal operation. My problem could stem from Audi's overly hot turbos.
Some disagree but its cheap to go an extra mile normally and only takes a few mins.
Some disagree but its cheap to go an extra mile normally and only takes a few mins.
#17
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Originally Posted by wrinkledpants
.... The radiant heat a feed line gets is substantially less than the inductive heating the oil gets being in contact with the turbo. Not only that, the time that oil spends sitting inside the bearing cavity will be longer than the time oil spends in the feed line.
....
....
#19
Three Wheelin'
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I would never shut off mine after a hard run, including a few redline shifts and .8bar boost (tuned)...I had a b5 S4 (2.7 bi-turbo) Audi for those that don't know, these turbos blowing up where quite common, with that said I let her run for about 30 sec after driving, if I get on her hard, I drive about a mile or two before shutting off at normal operation. My problem could stem from Audi's overly hot turbos.
Some disagree but its cheap to go an extra mile normally and only takes a few mins.
Some disagree but its cheap to go an extra mile normally and only takes a few mins.
#21
Three Wheelin'
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BTW, the IHI RHF5 Turbos in the Cayenne are Journal bearings and not Ball bearings. They would have a B suffix if they were Ball bearing.
http://turboparts.ecrater.com/p/1549...-kit-ihi-rhf5h
http://www.turbomaster.info/eng/cata...hi&pagina=RHF5
Typical Rebuild Kit: http://www.ebay.com.au/itm/Turbo-Reb...-/271531508260
http://turboparts.ecrater.com/p/1549...-kit-ihi-rhf5h
http://www.turbomaster.info/eng/cata...hi&pagina=RHF5
Typical Rebuild Kit: http://www.ebay.com.au/itm/Turbo-Reb...-/271531508260
#22
Racer
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BTW, the IHI RHF5 Turbos in the Cayenne are Journal bearings and not Ball bearings. They would have a B suffix if they were Ball bearing.
http://turboparts.ecrater.com/p/1549...-kit-ihi-rhf5h
http://www.turbomaster.info/eng/cata...hi&pagina=RHF5
Typical Rebuild Kit: http://www.ebay.com.au/itm/Turbo-Reb...-/271531508260
http://turboparts.ecrater.com/p/1549...-kit-ihi-rhf5h
http://www.turbomaster.info/eng/cata...hi&pagina=RHF5
Typical Rebuild Kit: http://www.ebay.com.au/itm/Turbo-Reb...-/271531508260
hence why turbo owners, should let it idle for 60-90 seconds after driving, keep the oil flowing & it lubed up while the turbos spin down, then let the water keep cooling it after shutdown.
#23
Three Wheelin'
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BTW, the IHI RHF5 Turbos in the Cayenne are Journal bearings and not Ball bearings. They would have a B suffix if they were Ball bearing.
http://turboparts.ecrater.com/p/1549...-kit-ihi-rhf5h
http://www.turbomaster.info/eng/cata...hi&pagina=RHF5
Typical Rebuild Kit: http://www.ebay.com.au/itm/Turbo-Reb...-/271531508260
http://turboparts.ecrater.com/p/1549...-kit-ihi-rhf5h
http://www.turbomaster.info/eng/cata...hi&pagina=RHF5
Typical Rebuild Kit: http://www.ebay.com.au/itm/Turbo-Reb...-/271531508260
#24
Three Wheelin'
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Seriously - do you really think all those wifes and soccer moms are idling their cars? It's been a long time since i've seen a post about a failed turbo. The only reason my turbo was replaced was because there was oil leaking from the charge pipe, and they thought it was a failed turbo. Nope - just a bad o-ring, LOL. Glad that wasn't on my dime.
I will idle the car for a minute after a hard, hot climb, but never during daily driving. If the Cayenne was that delicate, I would have sold it a long time ago.
#25
Racer
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Piece of mind for me esp when I'm putting 175-300 miles a day on my rig.
5k oil changes , idling , and proper maintenance is how I've gotten 175-200k on my vehicles in 4 yrs
5k oil changes , idling , and proper maintenance is how I've gotten 175-200k on my vehicles in 4 yrs
#26
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FWIW, I drove my cayenne hard and only would tame my drive the last few miles before shutting it off. I never let it idle first. I got ~180k out of it before an exhaust valve broke. The rfh5 IS a journal bearing turbo, not bb. Upon dissasembly I see no coking of oil in the bushings. However, both of my turbine housings were cracked internally in the same spot on each side. To me it is amazing that guys can get 520 hp out of two turbo's that are rated at 210hp each.
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Last edited by J'sWorld; 08-08-2017 at 11:46 PM.
#28
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This is slightly off model subject since I have 993tt and have been searching on and off to figure out why the secondary "key off" fan that blows onto the turbo housing is not coming on (it used too) after driving car. This is an interesting 993tt feature to help cool turbos with the key off. I replaced temp sensor (looks like a 2" coiled piece of steel) on left side of engine bay and checked fuses in same area which seem to be fine. However, there are several relays in the same area inside sealed box and I have no way of id'ing if they play a role in the cooling. I have Bentley manuals but don't see discussion their either.
Any 993tt folks "been-there-fixed-that"? Please refer me to prior threads if discussed ... I can not find!
Any 993tt folks "been-there-fixed-that"? Please refer me to prior threads if discussed ... I can not find!