924Board.org

will924s · Joined: 09 Feb 2005 Posts: 1

I'm going to turbo charge my 1987 Porsche 924s. I have everything except an intake manifold and a turbo ecu. If anyone knows where I can get them cheap or if someone has them on here let me know.

ESC944 · Joined: 21 May 2004 Posts: 747 Location: FL

Ah Will,

What do you mean by a turbo ECU? DO you mean both the klr and DME along with the wiring hardness from a 944 turbo or... are you talking about the 924 turbo ?

You car as I understand it is a 924S, so it has the 2.5?

AS far as manifolds, you should be able to have a good muffler shop or do it yourself, build you a cross over pipe.

Use a collector that gathers both y pipes from the stock exhaust manifold and routes into one collector and then run that pipe over to the drivers side.

Pull the stock air box and mount the turbo their, brace it on the cross over pipe and to the engine, so it moves with the engine and the weight of the turbo is not just supported by the crossover pipe.

Run your down pipe, to go straight down and back to the stock exhaust, remember your stock cat isnt really intended for use with a turbo application. Neither is your Sensors.. but you can get around that.

Now run your air intake side of the turbo to the stock fender openind or anyplace you can get good cold air.

Run the discharge side either directly to the AFM on a low boost application or to a intercooler and then to the AFM.

Now if you are going to rewire the car and instal a turbo wiring harness from a 944 turbo and the KLR and the DME good luck, the connections in the fire wall are different and its no simple job... their are far easier solutions.

OIL Delivery is easy enough, you can tap into the oil system at the oil filter using a oil relocator adapter. You can then tap in the oil pan, on the 944 it has the boss already their for the same location as the 944 turbo.

I personally dont think the stock oil system on the na is up to the job and would go with a isolated stand alone oil supply.

Hope that helps. But again, what ECU are you speaking of?

Helstrm · Joined: 05 Feb 2005 Posts: 198 Location: Columbia, SC

If he runs a turbo on a stock engine won't the compression be too high? I would think that he would blow head gaskets at the very least. Last guy I saw do it blew his head gasket twice and then lost #2 due to the bearing... Just some uneducated thoughts.

AznDrgn · Posted: Sun Feb 13, 2005 1:10 pm Post subject:

Compression is never TOO high, you just have to have a way to control the ignition and keep it from detonating. A couple of the guys over on rennlist are running NA pistons on a tuned turbo and they have no problems at all.
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-'87 Jeep Cherokee 4.0L 6" of lift 33" Super Swampers

-'83 Callaway 944 2.5L turbo, 300HP, 1 of 42 ever made

ESC944 · Joined: 21 May 2004 Posts: 747 Location: FL

The compression isnt that high, it is really a matter of controlling the combustion chamber temp and keeping detonation at bay. NA pistons can handle some decent temps, but will not hold up long if you have detonation or high boost.

Compression just limits the max boost, with out some pretty extreme mods, but even 1 psi adds power.

So I am still curious about which ecu we are talking about?

Lizard · Posted: Mon Feb 14, 2005 4:07 am Post subject:

also the 944 and 928 engines are built very well for boost, consider that the 928 guys are running 11 PSI of boost with 10:1 CR, this is using both factory ECU and also AutoAthority chips and they are getting no detonation.
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3 928s,

ESC944 · Joined: 21 May 2004 Posts: 747 Location: FL

Lizard,

Man I hear you, I do so love a boosted V8. Keep away detonation and is all good!!

B3aNz · Joined: 18 Feb 2005 Posts: 2

What the manufactor of the turbo are you using because i have been lloking for one that fits a 1987 porsche 924s and have had no luck

Paul · Posted: Fri Feb 18, 2005 5:45 pm Post subject:

The 944 turbo uses basically the same block and head as the 924S, so all of the 944 turbo parts should bolt on.

speedsta2003 · Joined: 12 Nov 2002 Posts: 302 Location: Lincoln, Nebraska

If I were you instead of buying a new ECU, I would use the stock w/ some piggy backs. Buy an Apex-i S-AFC to control your fuel, you'll want a wideband 02 sensor to watch your a/f ratios. For timing, MSD makes a boost-timing retard that controls the timing and retards depending on how you set it. And you may need an AFPR for fuel pressure. LATA

of course a decently sized intercooler would help prevent detonation also. Good luck.
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My Old Porsche Thats Sold
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