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Turbochargers

 
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fwood  



Joined: 26 Apr 2010
Posts: 37
Location: Yadkinville,NC

PostPosted: Tue Sep 26, 2017 10:13 am    Post subject: Turbochargers Reply with quote

I have a S2 931 that I have installed a rebuilt S1 turbocharger on. I have continually chased hot running problems that initially were fuel related due to dirty fuel infrastructure which I have hopefully addressed. In the Porsche FSM it says that the different chargers are not interchangeable. Is this true.
Frank
1982 931
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morghen  



Joined: 21 Jan 2005
Posts: 7674
Location: Romania

PostPosted: Tue Sep 26, 2017 4:37 pm    Post subject: Reply with quote

Does your car work?
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fwood  



Joined: 26 Apr 2010
Posts: 37
Location: Yadkinville,NC

PostPosted: Wed Sep 27, 2017 2:10 am    Post subject: Reply with quote

Yes. I have checked wur,Aav,fuel distributor,changed fuel pump and filter,cleaned fuel tank,all vacuum lines are good. It starts cold beautifully, idles strong,runs good until I drive for a while then it starts to starve out,with slight backfire, at which time it seems to almost overheat and die. After throughly cooling will go through the same process. I don't remember having this problem with the Original s2 turbo except when the fuel filter clogged which is clear now. I changed turbos because of an oil leak in the original and I got an s1 turbo that looked to be in better shape whichI had rebuilt.
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morghen  



Joined: 21 Jan 2005
Posts: 7674
Location: Romania

PostPosted: Wed Sep 27, 2017 2:58 am    Post subject: Reply with quote

Your problem is probably not the turbo.
They are interchangeable, meaning they will bolt on and the car will run fine.
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ideola  



Joined: 01 Oct 2004
Posts: 15462
Location: Woodstock IL

PostPosted: Wed Sep 27, 2017 4:03 am    Post subject: Reply with quote

morghen wrote:
Your problem is probably not the turbo.
They are interchangeable, meaning they will bolt on and the car will run fine.


Agreed. First thing I would try is replacing the ignition module on the inner fender well. There have been a few recent reports of these causing symptoms like what you're describing when the heat sink glue dries up and disintegrates. These can be gotten new for very reasonable cost.
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15 981 GTS | 88 924S SE | 82 931 Holbert | 82 931 Rallye | 81 937 | 81 Euro 931 | 81 Weissach | 80 US 928 | 80 US 931 '941' | 80 US 931 | 80 931 GTR | 79 Sebring | 78 D-Prod Replica | 78 w/D-Prod kit | 78 Poli-Form | 78 Limited Edition | 77 Martini
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Dutch924-racer  



Joined: 23 Jul 2007
Posts: 970
Location: The Netherlands

PostPosted: Wed Sep 27, 2017 5:24 am    Post subject: Reply with quote

I drove a s1 turbo on a s2 for a couple of years, no problem at all!
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1448
Location: Somerset, UK

PostPosted: Wed Sep 27, 2017 5:55 am    Post subject: Reply with quote

Many frankenturbo’s out there and the owners are none the wiser. PRevious owners and garages have been mixing them up for nearly 40 years
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1980 931 - forged pistons, Piper cam, CGT turbo, 951 ducted FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife LSD
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fwood  



Joined: 26 Apr 2010
Posts: 37
Location: Yadkinville,NC

PostPosted: Sun Oct 01, 2017 10:50 am    Post subject: Reply with quote

Thanks for those replies. I will try the ignition module. This is one of the best forums with absolutely priceless help.
Frak
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