924Board.org

Min · Posted: Wed Apr 23, 2008 3:42 pm Post subject: Water Cooled Turbo.

I'm installing a water cooled turbo onto one of the 924's I'm dealing with, however we're having a bit of difficulty determining the best location to get water pressure to the turbo from. Anyone have any thoughts on that?

Min
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Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.

Smoothie · Posted: Wed Apr 23, 2008 7:04 pm Post subject:

From what I've read here, the 951 uses an electric water pump to circulate coolant after shutdown. -And the 951s' coolant expansion tank has an extra port/s for turbo cooling.

To cool it from the existing 924 cooling system, I think I'd tap in after #11, or after #12 in the diagram on Haynes pg.59. -Or for a cooler coolant source, -if- there's a coolant drain port on the block, feed the turbo from there and return it after #11.
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"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

Min · Posted: Thu Apr 24, 2008 6:09 am Post subject:

I talked to bassgt about this a bit in private awhile ago, he mentioned that after the water leaves the head its no longer pressurized which means we would be unable to get it from 11 or 12, what are your thoughts on that?

Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.

bass gt · Posted: Thu Apr 24, 2008 6:14 am Post subject:

Min,

Not sure this is ideal for a water cooler turbo however. They rely on the water primarily to cool the unit. The oil is solely to lubricate. I think the issue is that wherever you take the feed from, there will be a negligable pressure difference across the in and out connections. I would recommend fitting a small electric pump to fed into the turbo, and return that feed after the head/block into the rad. The major advantage is that you can run the pump with the engine off, which will prevent turbo damage or oil coking.

Steve
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Front Wheel Drive is the Devil's work.

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11723 Location: PacNW

Why not just use a 951 electric pump, plumbing & tank? They even have a little shutdown timer and relay.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

moone924 · Joined: 05 Feb 2003 Posts: 867 Location: Douglas Wyoming

to get coolant to the turbo use something like this...
Block Coolant port adaptor:
http://www.034motorsport.com/product_info.php?cPath=28_63&products_id=477

and for the return ...

Tap into the engine coolant out to radiator neck like audi does or splice into the hose....

Also I should mention Audi uses a electric pump for after-run that is tied into a thermo switch, also on the coolant neck. These are junkyard parts and probably much cheaper to purchase then the 951 units
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Ryan Moone

Always shopping for a nice s2 931 to baby.
New philosophy : one car project at a time.

Min · Posted: Thu Apr 24, 2008 2:16 pm Post subject:

oh nice moone, very nice. I will definately be looking into that option, any idea what size of a freeze plug that replaces?

Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.

moone924 · Joined: 05 Feb 2003 Posts: 867 Location: Douglas Wyoming

by looking at a freeze plug on one of my audis and one on my 931 they look the same sized wise.
_________________
Ryan Moone

Always shopping for a nice s2 931 to baby.
New philosophy : one car project at a time.

moone924 · Joined: 05 Feb 2003 Posts: 867 Location: Douglas Wyoming

Min · Posted: Fri Apr 25, 2008 1:28 am Post subject:

Min · Posted: Fri Apr 25, 2008 3:50 am Post subject:

Smoothie · Posted: Fri Apr 25, 2008 12:32 pm Post subject:

Just steal the idea and make your own, right?
_________________
"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

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

moone924 · Joined: 05 Feb 2003 Posts: 867 Location: Douglas Wyoming

small enough? If I search for a freeze plug for my audi and for my porsche I get the same thing, said to be 36mm.

Now if that one if 36.7mm, I figure that sense the plugs are a pressed fit to seal in the block they might have to be slightly bigger before they're driven in. Make sense ?
_________________
Ryan Moone

Always shopping for a nice s2 931 to baby.
New philosophy : one car project at a time.

Min · Posted: Fri Apr 25, 2008 11:12 pm Post subject:

I tried to pound a 36.5mm frost plug into the 36mm hole on my 924 block, wouldn't go in. Perhaps I'm mistaken, I'll go buy a new 36mm frost plug and measure it.

Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.