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DZGunner
Joined: 18 Nov 2014
Posts: 191
Location: Great white north
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 Posted: Sat Feb 21, 2015 8:00 am Post subject: Turbo numbers |
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Whats the significance of the different generations of turbos? I've heard the early ones were unreliable and the later ones were a lot better.
I was looking around at some part numbers and I found this site below that shows what part numbers are what generation, but mine Isn't on this list, so I figured I'd ask you guys.
http://www.924.org/techsection/931_turbo.htm
My nameplate number is 5326 970 6407. Help appreciated. Thanks guys |
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924-76
Joined: 05 Jun 2006
Posts: 1489
Location: Ontario, Canada
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fiat22turbo
Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR
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| Posted: Sat Feb 21, 2015 9:12 am Post subject: |
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I believe the manifolds and housings were more susceptible to cracking. Otherwise they should be equally reliable when cared for properly.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose) |
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DZGunner
Joined: 18 Nov 2014
Posts: 191
Location: Great white north
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| Posted: Sat Feb 21, 2015 10:26 am Post subject: |
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| What does caring for a turbo actually mean, just changing oil frequently? |
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fiat22turbo
Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR
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| Posted: Sat Feb 21, 2015 10:30 am Post subject: |
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Using quality synthetic oils, changed frequently.
Letting it warm up properly before thrashing it.
Letting it cool down before shutting it off.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose) |
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DZGunner
Joined: 18 Nov 2014
Posts: 191
Location: Great white north
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| Posted: Sat Feb 21, 2015 10:36 am Post subject: |
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| So logically the 6407 would be something like a series 3 or a slight variation later? The thing just has a quotation mark where the others have a description |
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jason c
Joined: 13 Jan 2014
Posts: 1018
Location: Nwi
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| Posted: Sat Feb 21, 2015 10:41 am Post subject: |
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| DZGunner wrote: | | What does caring for a turbo actually mean, just changing oil frequently? |
Changing the oil regularly, using an oil that breaks down at higher temps, proper warm up and allowing the engine to run & turbo to cool before shutting it down.
Porsche had a lot of warranty repairs on the turbos because people treated them like regular cars. Short drives & not letting them cool before shutdown was the major problem.
They moved to a water cooled core on the 951. You can use the watercooled 951 k26 core (with plumbed in water lines) with the rest of your 931 turbo pieces to make the turbo last longer. You should also consider going to a larger radiator if you'll be running it in the summer to help remove the added heat from the system. |
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DZGunner
Joined: 18 Nov 2014
Posts: 191
Location: Great white north
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| Posted: Sat Feb 21, 2015 4:37 pm Post subject: |
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I've read things that a lot of 944 parts are interchangeable with 924's, like the suspension for one. Would a 944 radiator be a drop in fit/upgrade? I've been considering getting a 944 parts car.
How long of a warm up would you guys recommend, and how long of a cool down. If following a few simple steps will keep the turbo from failing then I may not need to go to a 944 t water cooled housing.
To my understanding the warm up is just to get oil circulating, and the cool down is to cool all the parts down and let the turbo slow down before cutting the engine. Just some things I've been reading for generic turbo car care.
I just wanna know what all I need to do before getting into it all. I'm so used to thrashing NA cars and them just working unconditionally that I don't want to be the one that ruins his car by not following a few simple steps. |
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jason c
Joined: 13 Jan 2014
Posts: 1018
Location: Nwi
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| Posted: Sun Feb 22, 2015 12:22 am Post subject: |
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| DZGunner wrote: | | I've read things that a lot of 944 parts are interchangeable with 924's, like the suspension for one. Would a 944 radiator be a drop in fit/upgrade? I've been considering getting a 944 parts car. |
Its not a drop in. You have to mount it and plumb it in. You can also use a larger aftermarket radiator. There is plenty of info on both of them if you search the board.
| DZGunner wrote: | How long of a warm up would you guys recommend, and how long of a cool down. If following a few simple steps will keep the turbo from failing then I may not need to go to a 944 t water cooled housing.
To my understanding the warm up is just to get oil circulating, and the cool down is to cool all the parts down and let the turbo slow down before cutting the engine. |
Let the engine & therefore the oil warm up before you "thrash" it.
Usually a minute or so is good for a cool down. You want to let the turbo cool enough so the temp in the turbo doesn't "coke" the oil. Coking of the oil plugs passageways, makes seals stick and causes wear. The coked oil wearing on the bearings, shaft & seals as well as plugging passegways destroys the turbo.
The average life of a cared for turbo is around 70k |
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kcoyle
Joined: 15 Jan 2011
Posts: 712
Location: Long Island, NY
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| Posted: Sun Feb 22, 2015 1:51 am Post subject: |
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944 rad install writeup thanks to Dan.
http://www.924board.org/viewtopic.php?t=36438
_________________
1982 931- Stock with MBC at 8psi
Relax, all right? My old man is a television repairman, he's got this ultimate set of tools. I can fix it. |
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DZGunner
Joined: 18 Nov 2014
Posts: 191
Location: Great white north
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| Posted: Sun Feb 22, 2015 2:51 am Post subject: |
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Thanks you guys. It just snowed again last night so looks like things might slow down a bit 
When I get back into it I was considering pulling the oil feed and return lines to the cooler to flush it out, just something at least to maybe check the condition of the oil in all their lines, and depending on its condition I may or may not pull the turbo and its lines for cleaning, to rid it all of the "coked" oil.
I just got a hold of a sheet metal bender so those mounting brackets Ideola came up with seem very possible.
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1979 924 (Daily driver EFI)
1979 924 Sebring
1977 924
1977 924 (Parts) |
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jason c
Joined: 13 Jan 2014
Posts: 1018
Location: Nwi
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| Posted: Sun Feb 22, 2015 11:32 am Post subject: |
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| Coked oil looks like crystalized plastic. Its gritty and sticks to metal well. I'm not sure flushing it out is going to clean it thoroughly. It takes a lot of scraping of the disassembled turbo to remove it. If you break the chunks loose but they don't get flushed out they may clog some of the small passageways. If you try to flush it, let the turbo soak in the cleaner for awhile. |
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DZGunner
Joined: 18 Nov 2014
Posts: 191
Location: Great white north
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| Posted: Sun Feb 22, 2015 3:01 pm Post subject: |
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Ok, will do, thanks for the heads up.
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1979 924 (Daily driver EFI)
1979 924 Sebring
1977 924
1977 924 (Parts) |
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Sun Feb 22, 2015 10:35 pm Post subject: |
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| DZGunner wrote: | | I just got a hold of a sheet metal bender so those mounting brackets Ideola came up with seem very possible. |
I made mine with a hammer, hack saw, and vice.
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erstwhile owner of just about every 924 variant ever made |
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kcoyle
Joined: 15 Jan 2011
Posts: 712
Location: Long Island, NY
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| Posted: Mon Feb 23, 2015 1:29 am Post subject: |
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| DZGunner wrote: | | I may or may not pull the turbo and its lines for cleaning, to rid it all of the "coked" oil. |
I don't recall the condition of your car but there are a bunch of little seals for the feed/return and that are a PITA to get at while in situ. I did mine last year with turbo in car as I had multiple small leaks that made a mess and was killing my starter. (feed, return, turbo bypass, oil pan, oil cooler adapter, etc, etc)
All in all not fun.
Dan has/had a kit for the seals that was awesome.
_________________
1982 931- Stock with MBC at 8psi
Relax, all right? My old man is a television repairman, he's got this ultimate set of tools. I can fix it. |
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