924Board.org

804kid · Joined: 19 Mar 2008 Posts: 18 Location: Richmond, Va

how many miles have u put on it, and is the clutch holding up? and how do you enrich the fuel system? sorry im a mustang owner so you cant expect me to know much.

804kid · Joined: 19 Mar 2008 Posts: 18 Location: Richmond, Va

This is basically what I did. My turbo is a mitsubishi 13t from a WRX. I took a nice evening and hooked up everything. I richened my fuel system so it wouldn't detonate and I gave it hell. 8 psi on my system is excellent. What a kick in the pants on acceleration.

My setup pretty much looks like Raceboy's. The turbo is on the drivers side with exhaust running around the oil pan.[/quote]

how many miles have u put on it, and is the clutch holding up? and how do you enrich the fuel system? sorry im a mustang owner so you cant expect me to know much.

71vdubturbo · Joined: 28 Nov 2006 Posts: 75 Location: Rolla, Missouri

I've put roughly 1000 miles on it. The clutch was the stock clutch when the car was sold in 77. I knew it would slip and it did so very badly. I put in a new, stock clutch and pressure plate. Holds fine. I'm estimating my power output is 150hp.

The stock CIS fuel system on the 924 has a small allen screw on the air flow meter arm. Tightening it a turn or two makes the fuel system run richer. Loosening it makes it run leaner.
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1977 Porsche 924 - going away...
2001 Audi S4 - 2.7T, Tip

804kid · Joined: 19 Mar 2008 Posts: 18 Location: Richmond, Va

71vdubturbo · Joined: 28 Nov 2006 Posts: 75 Location: Rolla, Missouri

CIS is a mechanical fuel system. The engine is given fuel based on air flow into the engine. CIS stands for continuous injection system.

I can't say whether or not it will be faster than your mustang but I can say that it is quick. This is partly because the car weighs very little compared to todays cars. My 924 isn't governed like your mustang is. I've seen 120 mph with little effort.

Gas mileage is another subject. It sucks with the stock fuel injection. My plan is to switch to Megasquirt. My 924 isn't my daily driver though. I have a diesel jetta for that.
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1977 Porsche 924 - going away...
2001 Audi S4 - 2.7T, Tip

71vdubturbo · Joined: 28 Nov 2006 Posts: 75 Location: Rolla, Missouri

http://home.hiwaay.net/~langford/CIS.html

This site explains CIS injection very well. Also, there are a lot of great posts on this board about turboing 924's. Try searching for NA turbo.
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1977 Porsche 924 - going away...
2001 Audi S4 - 2.7T, Tip

804kid · Joined: 19 Mar 2008 Posts: 18 Location: Richmond, Va

yeah 120 is hard to get to especially when the rev limit cuts you off at 118

but once i get my 924 on the road im selling, so i have money to spend on whatever i messed up a few hundred miles down the road, im put a new clutch kit in last week, stock, and a new torque tube, im scared if i run more then 8 psi that my transmission internals wont be able to take it, and do you have heat issues with the turbo, i was thinking about a carrera gt scoop over the turbo to cool it off, what do you think

804kid · Joined: 19 Mar 2008 Posts: 18 Location: Richmond, Va

dude ive read every turbo forum all the way through, and mostly what im seeing is, sell your na and buy a 931, i found a few where someone actually did it, i wanted to do this because of insurance reasons

71vdubturbo · Joined: 28 Nov 2006 Posts: 75 Location: Rolla, Missouri

My turbo is directly under the air flow meter box. The only problem I have with it is vapor locking. It is my understanding that all 924's have this problem at some time or another.

The transmissions can take a lot of beating before they give up. I'm more worried about the engine internals. The factory cast pistons can's take much more than 12 psi without getting too hot and melting.

To help ease you, I am running my setup on a stock engine. I did replace the head gasket as a precaution though. Check out my pictures of my setup to get an idea of what I did.

http://picasaweb.google.com/vw.crazy.04/My924Turbo
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1977 Porsche 924 - going away...
2001 Audi S4 - 2.7T, Tip

71vdubturbo · Joined: 28 Nov 2006 Posts: 75 Location: Rolla, Missouri

804kid · Joined: 19 Mar 2008 Posts: 18 Location: Richmond, Va

yeah i enjoy welding / pipe bending so i would presumably enjoy this project. how do you deal with the vapor locking problem? move the fuel pump to the interior of the fuel tank?

71vdubturbo · Joined: 28 Nov 2006 Posts: 75 Location: Rolla, Missouri

It needs a new fuel accumulator (holds pressure in the system when you shut it off). I just have to crank it for about 30 seconds then it starts.

This sounds like an excellent project for you. I did mine on a budget. My turbo is from ebay and my exhaust bends are from autozone. I think I have $250 in mine.
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1977 Porsche 924 - going away...
2001 Audi S4 - 2.7T, Tip

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

I have 17 psi on euro (9.3:1 CR) cast pistons and it works still flawlessly after a year and nearly 20 000 kms later.
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'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

71vdubturbo · Joined: 28 Nov 2006 Posts: 75 Location: Rolla, Missouri

Rich H · Posted: Thu Mar 20, 2008 11:21 pm Post subject:

Raceboy: Was that with the 9.5:1 pistons at 9.5:1? Or was that 9.5:1 pistons at a lower comp? IIRC the accepted norm is 7psi on standard engines before thigs go bang, but that is modern pap where as this is best Audi 1970's technology

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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec