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sonicspeed17 · Joined: 23 Dec 2006 Posts: 18 Location: south florida

I have a 87 924s that I would like to turbo and have a few questions, first is the compression on the 2.5 turbo motors any different then the NA version of the motor (is there a difference between the turbo 2.5 and non turbo 2.5 as far as internals go) provided that it is possible to turbo a NA 2.5 I have 2 ways to go, either buy all the parts off of ebay (all the exhaust components) and buy new larger injectors and a new turbo. or I can get a exhaust flange made and weld up my own turbo header and piping (I am a cert welder and have a nice tig machine to do all the work with) but the prices that the parts are going for on ebay make it a lot cheaper to just use the factory stuff from ebay. oh and the last question I had was in regards to the computer or DME whatever you want to call it, can I just replace the chip inside with a chip made for a 944 turbo or do I need a new computer

thanks
-Justin
PS here is a pic of the car before and after (lots of mods)

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flames · Joined: 28 May 2007 Posts: 88 Location: Perth Australia

What happened to your headlights?
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'78 924
Carrera? Body Kit
Bright Yellow

sonicspeed17 · Joined: 23 Dec 2006 Posts: 18 Location: south florida

got rid of the pop up lights to give the front a cleaner look along with blanking out the marker lights. the headlights are in the bumper (not finished yet) they are HID's from a new mercedes

morghen · Joined: 21 Jan 2005 Posts: 9095 Location: Romania

umm..when you wanted to turbocharge your 924S and you started by painting it yellow and removing the front lights?

good luck with it...i think it would be easyer to supercharge it...but if you are a good welder...have fun !

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Supercharger and EFI kits
https://www.the924.com

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

http://forums.rennlist.com/rennforums/showthread.php?t=374246

Oysteinrb · Joined: 21 Oct 2006 Posts: 47 Location: Norway

As far as i have heard, the con rods on the 2.5 NA engine are quite a bit "weaker" than the turbo ones, so if you are going to boost the hell out of it, that might be a problem. Compression issues are also present i think. If i remember correctly, the compression in the NA is around 10 or something...

dash16 · Joined: 22 Aug 2007 Posts: 255 Location: Cali Cali

I think the way you modded your car is very aesthetically pleasing. I may have picked a different color though.

As for turboing your vehicle, read this articles

It more work than slapping on a turbo.
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1987 Porsche 924S Black/Black. 5-spd.
Options: AFX C79 261 398 423 650 651 657

1987 Mercedes 190E 2.3-16 Cosworth Pearl Black/Black. 5-spd.

STUTTGART PREVAILS

leadfoot · Posted: Fri Sep 28, 2007 10:39 am Post subject:

Your on the right track, look at a wolf EMS 2.5ltr piggyback, this will give you programmable spark and fuel curves.
If you plan on running more than 6 psi then look at either changing pistons for lower compression or modify the cam for more duration to lower dynamic compression. The latter will chew fuel though.
Look at adding an oil cooler and boost controller whilst your at it...
Leadfoot
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1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

edh · Joined: 19 Nov 2003 Posts: 240 Location: Derby, UK

compression was lower on '86 and '87 models, so I guess that might help
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current - '90 944S2, '00 986S,
ex - '90 944 turbo '86 924S, '88 924S

flosho · Posted: Sat Sep 29, 2007 4:05 am Post subject: