924Board.org

Raceboy · Joined: 01 Mar 2004 Posts: 2327 Location: Estonia, Europe

Did that with my wife's white '83 NA, it has larger ports and I didn't need it anymore. But it was PITA, i had to redrill all the holes to 12mm because the bolt distance is different.
But, to my surprise, the 924 engine head ports are almost the same size as 931 intake manifold, NA's manifold has lot smaller ones. I matched the ports also.
I'll post some pics soon and today evening I'm going to test-drive it on the airport.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold

'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

endwrench · Joined: 07 Dec 2002 Posts: 1631 Location: Victor, Montana

Your driving impressions should be interesting.

Todd

Raceboy · Joined: 01 Mar 2004 Posts: 2327 Location: Estonia, Europe

Just got back from the airport.
What to say? Definitely was worth of all this PITA. Together with big bore throttle body performance over 4000rpm improved, I could feel it. Not drastically, but better. Did some measurements too, although I can't say the real difference. We have a marked 1 mile distance (1609m) for competition serias called One Mile Challenge. Winner is, who achieves the best top speed on one mile, time isn't important. It wasn't a race today, just me and my friend measuring the speed.

With just bigger TB, my best (in similar weather conditions: temp, humidity, wind) was 189kph, but now it was 193. Difference is 4kph. It's a little bit big for just a tiny change in weather or something else.
And it was measured with the same Stalker radar.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold

'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

morghen · Joined: 21 Jan 2005 Posts: 9102 Location: Romania

i have a 944 intake manifold...any chance to fit that on the 924 NA ? and if it would fit...any ideeas if it will work ? i also need the TB...any toughts ?
_________________
Supercharger and EFI kits
https://www.the924.com

Raceboy · Joined: 01 Mar 2004 Posts: 2327 Location: Estonia, Europe

944 manifold will NOT fit, the designs and sizes are way too different.
Even the 931 one did barely fit beacuse of the different (~5mm) bolt distance. Plus a lot of work needed to do with port matching, both TB and head.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold

'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

Eturbo924 · Joined: 09 Nov 2002 Posts: 2212 Location: Londonderry NH

My thought was that the longer tubes would help the lower end and not the top end... thus the turbo spooling up would take care of the top.

Is this not the case?

I have a turbo intake and thought about doing this same thing just to experiment. The other problem is the mounting of the throttle cables and such.

Funny I did not think the bolt pattern was different.

Eric
eturbo924@yahoo.com
_________________
1982 924
1992 968
2003 C4S
Parts Parts Parts and More parts.
E-mail me for parts you need!
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Raceboy · Joined: 01 Mar 2004 Posts: 2327 Location: Estonia, Europe

It's the case with turbo, yes, but since the length difference is marginal and ports are bigger, it apparently helps top end on NA. In near future I'm planning to dyno it, let's see then.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold

'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

924guy · Posted: Fri Jun 10, 2005 4:40 am Post subject:

drilling that manifold had to be a tough one... "pita" is most certainly a huge understatement...

dont let any one sell you 924 exhaust sealing gaskets for a 931, and there are quiet a few parts people that will indeed tell you they are the same...BzzzT, wrong answer..
ive got spares of both here, i can take a pic of em side by side if anyone needs..
_________________
Eric
78 924
82 931 SE "smokey"
99' VehiCross
Y2K Honda Insight
http://www.cardomain.com/id/924Guy
Performance by Pasha

Raceboy · Joined: 01 Mar 2004 Posts: 2327 Location: Estonia, Europe

hehee, I have a drilling machine (or whatever you guys call it) and it wasn't too bad, I din't have to hold a drill in my hands to make a mistake

But all that trial and error stuff just doesn't impress me, i like things to get clear before i tear everything apart. But sometimes you just have to deal with situations like this and there's nuthing you can do..... ok,I could put back the original manifold, but hey, what's the point of all that work then?

_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold

'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

macBdog · Posted: Fri Jun 10, 2005 10:59 am Post subject:

Does anybody have any resources for making your own inlet manifold? I remember seeing a pipe based one somewhere but it looked a bit poxy.

Im changing to a different TB and different intake piping and I can see how I would make it all join up to the stock manifold so I am going to go the fabrication route.
_________________
1979 931 with a 350 chev
1973 911E with EFI

Raceboy · Joined: 01 Mar 2004 Posts: 2327 Location: Estonia, Europe

I'm in progress of making one for my 931. and yes, it's based on that 110mm stainless tube, like our fellow board-member Racing's.
Here's some photos about his cars and himself: http://www.winas.com/modules.php?set_albumName=friends-racing&op=modload&name=gallery&file=index&include=view_album.php
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold

'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

CBass · Joined: 03 Nov 2002 Posts: 2807 Location: Vancouver, Canada

Technically while longer runners result in a pulse tuning effect at a lower RPM, if you do the actual math, you need a seriously long runner to bring that pulse effect below 6000rpm. I think the actual benefit of this is a better flowing design, although low end may suffer from the increased runner volume.

I'm interested in trying this with one of my cars, since I have two 924's, and only one throttle body, but a spare 931 intake and t/b. We'll see how well she works on my modified motor

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'81 931 in various states of assembly

-nick · Joined: 16 Nov 2002 Posts: 2699 Location: Cambridge, MA

I'd love to see before and after dyno tests. As I'm sure many other n/a owners are too!

nick

Raceboy · Joined: 01 Mar 2004 Posts: 2327 Location: Estonia, Europe

Keep in mind that i used bigger throttle body too, not NA or 931 (series 1 is the same as NA) one. I expect no more than 3-4 hp from simply swapping the intake manifols.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold

'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

CBass · Joined: 03 Nov 2002 Posts: 2807 Location: Vancouver, Canada

Which throttle body did you use? Is it the Weber T/B or the Audi unit?

Another thing to note, with a few slight modifications, A1 and A2 VW throttlebodies are interchangeable with eachother, and the A2 body is much larger. I hear talk of using Audi 5000 T/B's on VW's all the time, so there might be some benefit of going to the A2 VW t/b. Food for thought.
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'81 931 in various states of assembly