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944 2.5L Turbo into a 924??
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Sharky  



Joined: 29 Jun 2012
Posts: 13
Location: Australia

PostPosted: Sun May 05, 2013 1:53 pm    Post subject: 944 2.5L Turbo into a 924?? Reply with quote

Hi all,

I am the proud owner of a 1981 924 Turbo (931). It has the GT Carrera body kit, looks good and runs pretty well.

It is, however, a project vehicle. It is currently registered and running but will take alot of time, money and patience to get it up to the level of vehicle I would like it to be. Including repaint, interior work and some typical TLC that is given to older vehicles.

But I digress, I would really like to ask the gurus and long time owners/modders a few questions regarding the upgrades I would like to do.

Firstly, Will a 2.5L 944 turbo engine fit in to my 924 without any major mods? And if so, assuming I brought a rebuilt long block, would the 931 parts fit onto the 944??
I have done some research but I just can not find out if the 2.5L 944 engine is the same slant 4 style engine as the 931.

Secondly, If I was to keep my current, original 931 engine and upgrade the turbo... can I mount an aftermarket turbocharger in the same place as the original, with a customized manifold flange to suit said turbo? Or would I have to perform a major plumbing job and sit the turbo on the inlet side of the engine? Assuming that I would probably add a front mount intercooler to the mix, new plumbing is not out of the scope of possibilities, just wondering if it is a necessity.

A big thank you to anyone/everyone who takes the time to offer any advice or suggestions on my plans to take on a pretty big project that will get my rig to a respectable level.

Cheers,

Sharky.
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924aussie  



Joined: 02 Feb 2006
Posts: 1009
Location: Chinchilla Queensland Australia

PostPosted: Sun May 05, 2013 3:58 pm    Post subject: Reply with quote

Sharky,

First question is where in OZ are you. You may be close to some members that can help.


Taken you nearly a year for your first post



Alan
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green 924 .. 1980 rego 924PSH
1998 Mopar Neon ... sick
2003 Challenger / Montery 4WD
1995 Hyundai Scoupe ... sold
1998 Nissan Silvia ... sons back from OS he has taken it
BIG BLOODY MOTORHOME 300zx Sold
1980 Fire truck Sold
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Sharky  



Joined: 29 Jun 2012
Posts: 13
Location: Australia

PostPosted: Sun May 05, 2013 4:20 pm    Post subject: Reply with quote

Hi Allan,

Cheers for the reply.
Glad you mentioned that... I totally forgot to mention my locale

I am in Central Queensland, about 2.5 hours SW of Mackay, in a small town called Moranbah.

Yea, it did take me a while, I've spent more time reading through forums than posting. I've found with most forums it's better to spend time reading posts and seeing what sort of crowd generally reside within.... this was a lesson I learned on Whingepool (Whirlpool) Forums.

That being said, I have learned a lot over that year.

Cheers,

Sharky.
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11353
Location: PacNW

PostPosted: Sun May 05, 2013 4:45 pm    Post subject: Reply with quote

How would you define "major mods?" Of course a 2.5 will fit in your 931.
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Toofah King Bad
  • Shaggy (1980 931) - Got Boost?
  • Red (1987 924S) - Pro44/Spec944
  • Weiße Scheiße (1987 924S) - In Progress
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Sharky  



Joined: 29 Jun 2012
Posts: 13
Location: Australia

PostPosted: Sun May 05, 2013 5:01 pm    Post subject: Reply with quote

Quote:
How would you define "major mods?"


By major mods, I mean any cutting of the chassis, changes to engine mounts and so on.

I'm still pretty new to Porsche engineering, but I like it. Since I grew up owning Holdens.... this is a pretty new ball game to me.
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leadfoot  



Joined: 11 Dec 2002
Posts: 2222
Location: gOLD cOAST Australia

PostPosted: Sun May 05, 2013 6:15 pm    Post subject: Reply with quote

as far as keeping stock manifold you can do a hybrid turbo and use a different compressor and the same hotside, this is whats on my car.
essentially the 924S ws the same car with a 2.5 in it, 951 was the turbo variant and refined version with uprated transaxle.
Stu
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carbon fiber GT mish mash
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924aussie  



Joined: 02 Feb 2006
Posts: 1009
Location: Chinchilla Queensland Australia

PostPosted: Sun May 05, 2013 7:26 pm    Post subject: Reply with quote

Any current pictures and what do you intend to do with the old motor ?
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green 924 .. 1980 rego 924PSH
1998 Mopar Neon ... sick
2003 Challenger / Montery 4WD
1995 Hyundai Scoupe ... sold
1998 Nissan Silvia ... sons back from OS he has taken it
BIG BLOODY MOTORHOME 300zx Sold
1980 Fire truck Sold
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morghen  



Joined: 21 Jan 2005
Posts: 7825
Location: Romania

PostPosted: Sun May 05, 2013 7:43 pm    Post subject: Reply with quote

Sharky wrote:
Quote:
How would you define "major mods?"


By major mods, I mean any cutting of the chassis, changes to engine mounts and so on.

I'm still pretty new to Porsche engineering, but I like it. Since I grew up owning Holdens.... this is a pretty new ball game to me.



Then no the 2.5 uses different mounts and to have the 2.5 installed you need to cut and weld a bit of chassis.

Keep the 931 a 931 and the 944 a 944. The 931 is becoming a rare vehicle..and you'll be happy to own a not so molested one.

I own a 924 that i modded into a 924 turbo using factory parts. Further i've upgraded the 931 to a K27/k26 turbo hybrid and added a FMIC...trust me..the 2.0L turbo goes like stink
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nickthompson  



Joined: 26 Mar 2013
Posts: 849
Location: Central Georgia

PostPosted: Mon May 06, 2013 12:21 am    Post subject: Reply with quote

Why do guys in the Porsche community make such a big deal out of chance of motor mounts and doing minor cutting to make things fit? People in the hot rod community do this all the time and enjoy it.
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1547
Location: Somerset, UK

PostPosted: Mon May 06, 2013 1:28 am    Post subject: Reply with quote

If it were me I'd make the 931 engine produce 250bhp plus than make it a 931/944 frankenmotor!

It's not a straight engine swap. Mounts, TT, gearbox, torsion bar carrier/gearbox mounts, drive shafts all have to be considered. You may as well put the whole 944 turbo drive train in. If you do this it may be easier to stick 924 rear wings onto a 944 along with the CGT arches.
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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
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252
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morghen  



Joined: 21 Jan 2005
Posts: 7825
Location: Romania

PostPosted: Mon May 06, 2013 2:07 am    Post subject: Reply with quote

nickthompson wrote:
Why do guys in the Porsche community make such a big deal out of chance of motor mounts and doing minor cutting to make things fit? People in the hot rod community do this all the time and enjoy it.


Because hotrods are piece of sh!t non working, non practical rust buckets that are cool to look at while the 924 is a propper sports car that DOES NOT RUST if no body work(cutting/welding) is done on them.
The 924 survived until now and will continue to survive from now on BECAUSE IT DOES NOT RUST. If you molest the body of your 924 it wont live or be worth much.
The idea when modding is not to trash the qualities of the car but to improve something...where is the improvement when you just reduced its life ?

Plus..there's the better alternative...just slap the 924 pannels to a 951 and you're done...
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nickthompson  



Joined: 26 Mar 2013
Posts: 849
Location: Central Georgia

PostPosted: Mon May 06, 2013 2:35 am    Post subject: Reply with quote

That is quite possibly the worst answer to an honest question I have ever heard.
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morghen  



Joined: 21 Jan 2005
Posts: 7825
Location: Romania

PostPosted: Mon May 06, 2013 4:42 am    Post subject: Reply with quote

nickthompson wrote:
That is quite possibly the worst answer to an honest question I have ever heard.


why?
i told you why I dont fancy cutting up my long life chassis...now tell me how you dont find longevity of the body and chassis an incredible thing to have on your beloved sports car ?
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nickthompson  



Joined: 26 Mar 2013
Posts: 849
Location: Central Georgia

PostPosted: Mon May 06, 2013 7:15 am    Post subject: Reply with quote

The unnecessary insulting hot rods and their owners/mechanics got under my skin a bit. Some of my good friends hot rod anything they get their hands on and have great metal working skills and massivd amounts of knowlage. If you consider how much older theor cars generally are the conditions they are in is generaly good compared to other cars fromthe same era. Look for a rust free 356 tthat's been in a barn for 35 years.
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fiat22turbo  



Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR

PostPosted: Mon May 06, 2013 7:39 am    Post subject: Reply with quote

Okay, enough BS. Bottom line? The 2.5L requires different mounts and frame hacks to fit the engine and crossmember/steering rack.

The TT, transaxle, shifter, rear suspension, and most of the front suspension will swap over though.

An Audi 20-valve 5- cylinder is a better fit, just not as well documented yet.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)
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