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924 GTP project started
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Raceboy  



Joined: 01 Mar 2004
Posts: 2292
Location: Estonia, Europe

PostPosted: Thu Aug 10, 2006 1:55 am    Post subject: 924 GTP project started Reply with quote

Hi guys!
I planned this for a long time and "officially" it started yesterday.
I bought S2 16valve head and 2,5litre NA block and also 951 piston set + rods from my friend. Yes, it's going to be 2,5litre 16valve turbocharged with K27/8 bought also from my friends car that gave a 2nd cylinder conrod a bit of fresh air I plan to mount turbo to the "right" side of the car i.e. like 931 by fabricating custom exaust manifold and modifiyng the wheel well.
I have 951 intercooler and stuff for new intake manifold (because stock 951 and S2 one sucks big time).
Today I stripped the head to get it overhauled. I'm getting rid of the S2 heads weak spot: the chain tensioner between two cams by using two exaust cams and two cam pulleys from Toyota 16v engine (and custom crank pulley). It has been done before many times and it works. 924 GTP also used this setup (not with Toyota parts obviously).
Fitting the 3.0 engine head to the 2,5litre block requires modifying the front water channel of the head and longer head studs (I'm having them made from appropriate 12strentgh bolts, we did it on my friends 951 3.0 8v conversion and it works flawlessly @ 1,5 Bar with 8,9:1 comp ratio.
As for engine management.....no questions that it will be VEMS.

This engine will find a place in my wifes '83 NA together with 951 gearbox and torque tube. Conversion to hydraulic clutch is obvious (as I did that already to my other project, more about that later).
The car will be 100% daily driver.
I plan to get the engine together by the end of this year and the conversion should be done by spring.

Anyway, I usually DON'T hype things before they've taken place but I wanted to share this with you guys, so any ideas, hints etc are welcome.
_________________
'83 924 2.5 16v Turbo, 470hp
'67 911 Irish Green hotrod, 2.4S
'89 944 S2
'91 944 S2
'78 924
'78 911 SC 2.5 ss Turbo "Martini"
'82 924S/931 "Gulf" racecar, 330 hp, sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche


Last edited by Raceboy on Thu Aug 10, 2006 2:53 am; edited 1 time in total
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J1NX3D  



Joined: 06 Feb 2003
Posts: 1332
Location: New Zealand

PostPosted: Thu Aug 10, 2006 2:51 am    Post subject: Reply with quote

neat!!! are you on the rennlist 951 forums? when theyre not slinging crap at each other its pretty good there
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'86 944
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Raceboy  



Joined: 01 Mar 2004
Posts: 2292
Location: Estonia, Europe

PostPosted: Thu Aug 10, 2006 2:55 am    Post subject: Reply with quote

J1NX3D wrote:
neat!!! are you on the rennlist 951 forums? when theyre not slinging crap at each other its pretty good there


Yes, I lurk there from time to time and post sometimes. But, I haven't showed my stuff there because I'm on the "dark side" of the Porsche ownership (read: fiddling with 924's)
_________________
'83 924 2.5 16v Turbo, 470hp
'67 911 Irish Green hotrod, 2.4S
'89 944 S2
'91 944 S2
'78 924
'78 911 SC 2.5 ss Turbo "Martini"
'82 924S/931 "Gulf" racecar, 330 hp, sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche
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morghen  



Joined: 21 Jan 2005
Posts: 7885
Location: Romania

PostPosted: Thu Aug 10, 2006 2:57 am    Post subject: Reply with quote

bhooooaaaaaaaaa !! u're gonna snack on ferarris, corvettes and lambos !!!

good luck with this project ! sounds superb !!

as a sugestion...but i dont think i can give you any sugestions....just dont forget that you need the brakes from the S2 or the 951 as well.

I think that you need wider tires and for that you might need to go widebody.
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red 924 and not red 924
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J1NX3D  



Joined: 06 Feb 2003
Posts: 1332
Location: New Zealand

PostPosted: Thu Aug 10, 2006 3:03 am    Post subject: Reply with quote

Raceboy wrote:
J1NX3D wrote:
neat!!! are you on the rennlist 951 forums? when theyre not slinging crap at each other its pretty good there


Yes, I lurk there from time to time and post sometimes. But, I haven't showed my stuff there because I'm on the "dark side" of the Porsche ownership (read: fiddling with 924's)


well, i personally wouldnt reveal plans, details or anything till its all done then post a thread with pictures. they have too many naysayers, trolls and tyre-kickers over there that unless you're a regular and a paying member, they'll turn your thread into rubbish real fast.

that vitesse racing though... maybe stay in email contact with him...
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'86 944
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Raceboy  



Joined: 01 Mar 2004
Posts: 2292
Location: Estonia, Europe

PostPosted: Thu Aug 10, 2006 3:09 am    Post subject: Reply with quote

I have already 944 brakes and they're adecuate with Zimmermann rotors and Ferodo pads+ 18" Turbo twist wheels /e 225 tyres. Perhaps wider to the rear in future (as rims are 8.5 inch wide, good for 255mm).
_________________
'83 924 2.5 16v Turbo, 470hp
'67 911 Irish Green hotrod, 2.4S
'89 944 S2
'91 944 S2
'78 924
'78 911 SC 2.5 ss Turbo "Martini"
'82 924S/931 "Gulf" racecar, 330 hp, sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche
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morghen  



Joined: 21 Jan 2005
Posts: 7885
Location: Romania

PostPosted: Thu Aug 10, 2006 7:41 am    Post subject: Reply with quote

good then ! GO !

cant wait to see it done and hear the wonderfull storyes of how some ferarri/lambo jerk tought he could play games with you and you blew his doors off

again....tons of good luck ! sounds realy impressive !
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Raceboy  



Joined: 01 Mar 2004
Posts: 2292
Location: Estonia, Europe

PostPosted: Tue Dec 02, 2008 7:46 am    Post subject: Reply with quote

It's been a while and the progress is kinda slow but here's a little update.
Finally received the 944 S 2.5liter head, new stainless steel valves, full radius cut (not 3 angle etc) and machined seats, new guides, new stems. Exaust ports ceramic coated and intake ports and valve seats got small improvement in flow.
Photos are taken with a cell phone, so some are semi-decent quality, some are crappy quality

Head just before installing the valves:


Combustion chamber:


Generously flowing intake port, these are HUGE on Porsche 16V heads:


Ceramic coated exaust port:




And here's the head with valves installed:


This is the turbocharger for this engine, meet Holset HX40:

_________________
'83 924 2.5 16v Turbo, 470hp
'67 911 Irish Green hotrod, 2.4S
'89 944 S2
'91 944 S2
'78 924
'78 911 SC 2.5 ss Turbo "Martini"
'82 924S/931 "Gulf" racecar, 330 hp, sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche


Last edited by Raceboy on Tue Dec 27, 2011 12:12 am; edited 2 times in total
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ideola  



Joined: 01 Oct 2004
Posts: 15508
Location: Woodstock IL

PostPosted: Tue Dec 02, 2008 8:04 am    Post subject: Reply with quote

B-E-A-Utiful!
_________________
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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tuurbo  



Joined: 09 Aug 2007
Posts: 1463
Location: East Windsor, New Jersey

PostPosted: Tue Dec 02, 2008 8:57 am    Post subject: Reply with quote

Excellent project.
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1980 924 turbo, MSD, Meth. Inj, otherwise stock.
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Joes924Racer  



Joined: 03 Nov 2002
Posts: 11966
Location: Oregon, Denver Colorado native!

PostPosted: Wed Dec 10, 2008 4:46 pm    Post subject: Reply with quote


_________________
1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.
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Keaton  



Joined: 02 Jan 2006
Posts: 261
Location: 85202

PostPosted: Wed Dec 10, 2008 6:30 pm    Post subject: Reply with quote

i can wait to see this finished. please take lost of pictures and document the hell out of everything. i love a good build thread. even if its you taking out 1 of 10 bolts (not really but you get what i mean)
Raceboy wrote:


Generously flowing intake port, these are HUGE on Porsche 16V heads:



are you going to clean up/smooth out those casting marks

whats you power goal with this build?
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Raceboy  



Joined: 01 Mar 2004
Posts: 2292
Location: Estonia, Europe

PostPosted: Wed Dec 10, 2008 6:53 pm    Post subject: Reply with quote

These are very light grooves where valve seat and port are meeting. Not going to do anything about these.

Power goal is 420hp @ 1bar like Porsche factory engine was, but I'm afraid it's going to be a bit more. Holset HX40 has it's highest efficiency area at pressure ratio around 2.4-3.0 (1.4-2.0 bar of boost) and my ultimate goal is to run it occasionally at 1.5 bars. Since Porsche 16V heads flow excellent, it's going to make good power.

More than anything I'm worried about the block.
_________________
'83 924 2.5 16v Turbo, 470hp
'67 911 Irish Green hotrod, 2.4S
'89 944 S2
'91 944 S2
'78 924
'78 911 SC 2.5 ss Turbo "Martini"
'82 924S/931 "Gulf" racecar, 330 hp, sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche
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ideola  



Joined: 01 Oct 2004
Posts: 15508
Location: Woodstock IL

PostPosted: Wed Dec 10, 2008 11:22 pm    Post subject: Reply with quote

Do you have a map for the Holset? Would be interesting to see...

What can you tell us about the arrangement of the turbo? I presume it will be configured similarly to a 951 on the "cold" side of the engine?
_________________
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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Raceboy  



Joined: 01 Mar 2004
Posts: 2292
Location: Estonia, Europe

PostPosted: Thu Dec 11, 2008 1:15 am    Post subject: Reply with quote

Here's one HX40 vareiant compressor map I found:


I have the exact map of my HX40 on my work computer and it has the 79% area a little bit higher on the map but this gives an idea.

Turbo will be most likely at the front of the engine or on normal side (right side that is). I'll tear everything apart and start putting back and fitting things. Oil filter will be relocated (hence the wish to buy remote mount from you Dan ) and radiators, pop-up light motor etc relocated. Most likely I'll have to cut inner fender also and weld new sheet metal there.
_________________
'83 924 2.5 16v Turbo, 470hp
'67 911 Irish Green hotrod, 2.4S
'89 944 S2
'91 944 S2
'78 924
'78 911 SC 2.5 ss Turbo "Martini"
'82 924S/931 "Gulf" racecar, 330 hp, sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche
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View user's profile Send private message Visit poster's website MSN Messenger
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