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SpreadTheTed
Joined: 18 May 2021 Posts: 26 Location: Rhode Island
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Posted: Tue May 18, 2021 9:33 pm Post subject: 931 swapping my 944 |
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Hey all, my first post post here so go easy on me, I have a good condition 1985.5 944, but I'm not a fan of the 944 powerplant, luckily I just picked a 1980 931 with a crusty shell but a good running motor, has anyone done this swap before? I know this was the first year of the Audi Transaxle, but I've heard there's like different torque tube sizes and such? Any advice would be great, or a link to a thread because I haven't found one yet.
EDIT: I just figured out it's actually a 1982 931! Just looked at the title I guess I need this guy to write a new bill of sale
Last edited by SpreadTheTed on Wed May 19, 2021 12:19 pm; edited 1 time in total |
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Fasteddie313
Joined: 29 Sep 2013 Posts: 2596 Location: MI
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Posted: Tue May 18, 2021 11:34 pm Post subject: |
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Interesting..
Is the 931 a 5 lug or a 4 lug? _________________ 80 Turbo - Slightly Modified |
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SpreadTheTed
Joined: 18 May 2021 Posts: 26 Location: Rhode Island
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Posted: Wed May 19, 2021 5:26 am Post subject: |
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Fasteddie313 wrote: | Interesting..
Is the 931 a 5 lug or a 4 lug? |
It's a 5 lug with an Audi Transaxle |
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Rasta Monsta
Joined: 12 Jul 2006 Posts: 11723 Location: PacNW
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Posted: Wed May 19, 2021 10:21 am Post subject: |
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I don't think 016 trans was stock in 1980. More likely a Getrag unit.
In answer to your query, I don't recall anyone swapping a 2.0 into the 2.5 platform, so there may not be a thread. _________________ Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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Fifty50Plus
Joined: 28 Feb 2008 Posts: 1358 Location: Washington DC area
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Posted: Wed May 19, 2021 10:26 am Post subject: |
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So you want to reverse engineer a 944 tub, wiring harness, dash, subframe, clutch pack, exhaust, blah blah blah in order to install an unknown 931 engine that "runs good"? _________________ 1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car |
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jacobroufa
Joined: 18 Nov 2016 Posts: 531 Location: Belvidere, IL
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Posted: Wed May 19, 2021 11:02 am Post subject: |
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AFAIK the driveshaft is the same diameter from 944 and 931.. _________________ 1980 Porsche 931
1981 Porsche 924 Weissach |
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SpreadTheTed
Joined: 18 May 2021 Posts: 26 Location: Rhode Island
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Posted: Wed May 19, 2021 12:17 pm Post subject: |
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Fifty50Plus wrote: | So you want to reverse engineer a 944 tub, wiring harness, dash, subframe, clutch pack, exhaust, blah blah blah in order to install an unknown 931 engine that "runs good"? | I think someone is a little confused on the relationship between 944s and 924s |
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Rasta Monsta
Joined: 12 Jul 2006 Posts: 11723 Location: PacNW
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Posted: Thu May 20, 2021 12:40 am Post subject: |
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SpreadTheTed wrote: | I think someone is a little confused on the relationship between 944s and 924s |
....and they might not even know it's them. _________________ Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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Fifty50Plus
Joined: 28 Feb 2008 Posts: 1358 Location: Washington DC area
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Posted: Thu May 20, 2021 4:29 am Post subject: |
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If I recall correctly, someone here described installing a 944 engine into a 924 tub. Probably a lot less retro fit than the other way around. And not turbo related. _________________ 1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car |
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SpreadTheTed
Joined: 18 May 2021 Posts: 26 Location: Rhode Island
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Posted: Thu May 20, 2021 4:48 am Post subject: |
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Rasta Monsta wrote: | SpreadTheTed wrote: | I think someone is a little confused on the relationship between 944s and 924s |
....and they might not even know it's them. |
Man if you were half as good a mechanic as you were a comic you'd probably want to stick to leasing
In all seriousness though, I didn't come to listen to the elderly crack wise. I'm really just interested to see if anyone has done this before (it looks like they haven't) and if anyone has any tips to smooth out the process, as I understand it pretty much all I have to do is get switched power to my ignition, fuel pump, and to the CIS, and everything else is bolt in, also the 931 has a new fuel system with an external electric fuel pump. Is there anything I'm missing? If someone has a write up on the most effective way to wire everything it would be appreciated |
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Fifty50Plus
Joined: 28 Feb 2008 Posts: 1358 Location: Washington DC area
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Posted: Thu May 20, 2021 5:08 am Post subject: |
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Everything is NOT bolt in. You have to do some cutting and welding. _________________ 1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car |
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Rasta Monsta
Joined: 12 Jul 2006 Posts: 11723 Location: PacNW
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Posted: Thu May 20, 2021 6:52 am Post subject: |
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SpreadTheTed wrote: | I didn't come to listen to the elderly crack wise |
"How to Get Favors from Strangers. . .The Rhode Island Way"
If you understand it is all bolt in, then bolt it all in, and please let us know how it goes. _________________ Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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Carrera RSR
Joined: 08 Jan 2010 Posts: 2309 Location: Somerset, UK
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Posted: Thu May 20, 2021 5:38 pm Post subject: |
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Everything is possible. Sometimes you have to ignore folks saying it can't be done and just pave your own path. Unlikely you will find a blow by blow 'how to' on t'internet.
Engine + mounts, TT, torsion bar carrier, gearbox swap between the two, some welding of 931 engine mounts onto 944 shell, some splicing of wiring. Simples. What is there to go wrong? _________________ 1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252 |
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Rasta Monsta
Joined: 12 Jul 2006 Posts: 11723 Location: PacNW
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Posted: Thu May 20, 2021 10:58 pm Post subject: |
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I didn't say it couldn't be done, just that I couldn't recall a thread here detailing the process. _________________ Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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joemoma1990
Joined: 29 Jun 2021 Posts: 32 Location: Apple Valley, MN
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Posted: Sat Aug 07, 2021 3:57 am Post subject: |
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Isn't the US based 931 less HP then the NA 944? I think there is easier ways to get more power out of the 2.5 p44 engine then dropping the 931 engine in |
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