924Board.org

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

Hi guys!
I'm about to finish my ITB manifold for my 931 and thought you guys may want to have a look inside of it

The difuser is missing right now from the pics but I have made it, though it doesn't look too nice right now

I used NA stock flanges and had welded tapered "adapters" to match ITB's, these things need pretty heavy port matching also. The mounting holes are in need for some cleaning and machining.
I'm trying it on my car in a few days, if everything lines up, I have the whole thing welded up.

_________________
'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

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

Great work! Looks like you're pulling out all the stops

I presume you're going to move the alternator away from it's stock location too? I think racing found some space under his intake (where my friendly AC compressor sits).

Keep an eye on the fitment near the brake booster & master cyl. too. It's close on mine. In fact, I had to bend my brake lines around - but I have my throttle body mounted on that side too.

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

Yes, I cut the AC compressor mounting bracket and move the alternator down. A bit of fabricating and different V-belt, but it should come out fine.
_________________
'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

bass gt · Posted: Wed Aug 23, 2006 6:59 am Post subject:

Raceboy,

How are you finding the clearance between the plenum and the brake booster. Mine was very tight, so I'm inerested to see how the diffusor will fit on. BTW, I'll have those pics for you in a day or two. VV busy at work at the mo.

Steve

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

That was my main concern too. I mount the difuser on the top of the main plenum, otherwise it fits. I want to retain the runners as long as possible, hence the top mount (otherwise I could shorten the trumpets by lot).
_________________
'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

931Tony · Joined: 15 Jan 2007 Posts: 40 Location: Lawrence, KS

Looks good. When will we be getting the on-the-car pics and update?

flosho · Posted: Tue Jan 23, 2007 4:31 pm Post subject:

Semi-off topic..

What is the stock manifold made out of? How hard is it to weld aluminum or mild steel to the stock manifold runners?
_________________
[This Space For Rent]

Joes924Racer · Posted: Tue Jan 23, 2007 7:30 pm Post subject:

Wow thats pretty awesome raceboy.
_________________
1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

JakeFrame · Joined: 28 Feb 2006 Posts: 93 Location: Ohio zip- 43501

The stock manifold is cast aluminum. Not sure how hard welding the aluminum would be, but I will assure you that welding the steel onto the aluminum runners is impossible due to the nature of the metals.
_________________
1976 924 Automatic- Body Only
1977 924 4 spd Red~For Sale~
1977 924 4 spd Yellow~For Sale~
1977 924 4 spd
1992 Mercedes 300e 4MATIC

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

WOW!

_________________
Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

Joes924Racer · Posted: Wed Jan 24, 2007 7:47 am Post subject:

Dang.. Thats gonna be nice. Isnt the gas mileage gonna be like having
gas sucked up thru a straw I know its for a racecar though still gas is exspensive almost averywhere.
_________________
1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

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

The manifold is in the car and all fibished up. But I've been too busy finishing this whole thing up because of my university studies, work and some racecar projects.

And it had to be modified a bit. The design you see in those pics is "under develeoplemtn stage"

And no, 931 that they sit on is street car that gets occasional track days.
_________________
'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