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Water Cooled Turbo.
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Min  



Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada

PostPosted: Wed Apr 23, 2008 3:42 pm    Post subject: Water Cooled Turbo. Reply with quote

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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Smoothie  



Joined: 01 Jan 2003
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Location: DE (the one near MD, PA, NJ)

PostPosted: Wed Apr 23, 2008 7:04 pm    Post subject: Reply with quote

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



Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada

PostPosted: Thu Apr 24, 2008 6:09 am    Post subject: Reply with quote

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
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bass gt  



Joined: 02 Dec 2004
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Location: Johannesburg for now!!

PostPosted: Thu Apr 24, 2008 6:14 am    Post subject: Reply with quote

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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Rasta Monsta  



Joined: 12 Jul 2006
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PostPosted: Thu Apr 24, 2008 6:27 am    Post subject: Reply with quote

Why not just use a 951 electric pump, plumbing & tank? They even have a little shutdown timer and relay.
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moone924  



Joined: 05 Feb 2003
Posts: 866
Location: Douglas Wyoming

PostPosted: Thu Apr 24, 2008 2:12 pm    Post subject: Reply with quote

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.


Last edited by moone924 on Thu Apr 24, 2008 2:20 pm; edited 1 time in total
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Min  



Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada

PostPosted: Thu Apr 24, 2008 2:16 pm    Post subject: Reply with quote

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

Min
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moone924  



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PostPosted: Thu Apr 24, 2008 2:23 pm    Post subject: Reply with quote

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

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moone924  



Joined: 05 Feb 2003
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PostPosted: Thu Apr 24, 2008 2:26 pm    Post subject: Reply with quote

moone924 wrote:
by looking at a freeze plug on one of my audis and one on my 931 they look the same sized wise.


Confirmed both are 36mm

So that one 034 sells will work
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Min  



Joined: 04 Nov 2002
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Location: Vernon, British Columbia, Canada

PostPosted: Fri Apr 25, 2008 1:28 am    Post subject: Reply with quote

moone924 wrote:
moone924 wrote:
by looking at a freeze plug on one of my audis and one on my 931 they look the same sized wise.


Confirmed both are 36mm

So that one 034 sells will work


I sent them a contact us message to find out what size that plug is for sure. Before buying it.

Min
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Min  



Joined: 04 Nov 2002
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Location: Vernon, British Columbia, Canada

PostPosted: Fri Apr 25, 2008 3:50 am    Post subject: Reply with quote

Quote:
Ahh, sorry, 36.7mm

Javad Shadzi
034Motorsport
(510) 657-6707


I don't think thats small enough....



Min
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Smoothie  



Joined: 01 Jan 2003
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Location: DE (the one near MD, PA, NJ)

PostPosted: Fri Apr 25, 2008 12:32 pm    Post subject: Reply with quote

Just steal the idea and make your own, right?
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endwrench  



Joined: 07 Dec 2002
Posts: 1629
Location: Victor, Montana

PostPosted: Fri Apr 25, 2008 1:22 pm    Post subject: Reply with quote

Min wrote:
Quote:
Ahh, sorry, 36.7mm

Javad Shadzi
034Motorsport
(510) 657-6707


I don't think thats small enough....



Min


Well, that is about .027" crush and I just measured a 1 5\8" plug (~41mm) and it has about .015" crush so ya, it would be a very tight squeeze.

Todd
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'79 924NA. Rebuilt 9.5:1, MSDS header, Mega Squirt Injection, MJLJ-EDIS Ignition, 1.6L Whipple Charger and Intercooler, 10lbs Boost, 944 Trans, Custom HD Clutch.
"simsport" said....superchargers are better than turbos its official!....
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moone924  



Joined: 05 Feb 2003
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Location: Douglas Wyoming

PostPosted: Fri Apr 25, 2008 1:24 pm    Post subject: Reply with quote

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 ?
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Ryan Moone

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Min  



Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada

PostPosted: Fri Apr 25, 2008 11:12 pm    Post subject: Reply with quote

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
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