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Old 10-15-2006, 01:31 AM   #1
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Default 1.8L Turbo Coolant Line Routing

Just got this car a little while ago and when I reinstall the turbo and whatnot i want to install coolant lines because it's currently running only oil. Where Do I run the coolant lines to and from on the engine? Is there a fitting in the block or maybe the intake that i'm not aware of? I searched and searched and found info on 1.6s but i didn't see anything on 1.8s. Thanks ahead of time guys. This forum is making my life easier by the hour, atleast when it comes to working on my car. The forum does not make my life easier with my g/f, damn car obsession.
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Old 10-15-2006, 01:51 AM   #2
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on my car, there is a small hose (something like a bypass line) that comes off the bottom of the thermostat housing. Take the hose off of that and run the line from there to the turbo and then take the water outlet from the turbo to the other end of where the hose used to go. That should work out for ya.
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Old 10-15-2006, 07:46 PM   #3
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Looking towards the back of the car:

To the right of the thermostat housing there is a pipe that connects down to the a pipe that comes forward from the rear of the block. Take out that small pipe - spring clips at top and bottom, and route the top connection to the inboard side of the turbo (side closest to the exaust manifold) and the bottom connection to the outboard side.

Hope this helps!

DB
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Old 10-15-2006, 08:09 PM   #4
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yeah, thats the line I'm talking about
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Old 10-15-2006, 08:17 PM   #5
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Thanks guys, I searched my head off on here and couldn't find any info. When I have questions like this i'll continue to title them so they're easy to find in a search again. Thanks again.
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Old 10-16-2006, 06:49 PM   #6
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I dont know if its exactly the same but I had a similar question in this thread
https://www.miataturbo.net/forums/showthread.php?t=4242

image only here
https://www.miataturbo.net/forums/sh...53&postcount=6
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Old 10-16-2006, 07:28 PM   #7
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Exactly what I was looking for, appreciate it VRT.
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Old 10-17-2006, 12:23 AM   #8
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I would suggest using stainless hard lines to get away from the turbo, or you will eat up the rubber/silicone being so close to the turbine.
-Michael-
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Old 10-17-2006, 12:43 PM   #9
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I was looking into using hardlines off the turbo then running the silicone for the coolant hoses, I might just run braided lines the whole time though, even if its not cost effective, just for piece of mind. What do you think on that though? Run about 5-8" of hardline, then tie on to it with silicone lines? Or just run braided with 90* fittings on one end to get to the turbo.
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Old 10-17-2006, 01:32 PM   #10
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I would run 3/8 hardline from the turbo far enough away for your comfort then use whatever you want. I am just using 5/16 fuel line.
-Michael-
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Old 11-13-2006, 08:29 PM   #11
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Anyone know a place off the top of their head that sells custom hardlines. The places I've checked so far don't do it.
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Old 11-14-2006, 02:24 AM   #12
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Default Doesn't adding cooling to the turbo overheat the radiator?

HI Guys
I'm in the same boat (or car) my turbo doesn't have the water lines connected. I assumed that it was because the standard radiator would not be up to it. Is this usually an issue? (NB 1.8 with a HKS kit). Cheers Gazza
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Old 11-14-2006, 09:32 AM   #13
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No, that's not the case. The engine must get rid of the heat the turbo makes, whether it's only oil-cooled or oil- and water-cooled.

If it's oil cooled only, all the extra heat goes into the engine oil, which means your engine oil will probably run a bit hotter, which means your block/head will run a bit hotter, which means the coolant will run a bit hotter, which means your radiator/fans will work a bit harder.

If it's cooled by both water and oil, the oil spit out by the turbo might be a bit cooler, but the coolant will of course be a bit hotter. Overall, this is the best scenario, as cooling the turbo cartridge more evenly and spreading the thermal load of the turbo more directly across the engine's cooling capacity.
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Old 11-14-2006, 01:42 PM   #14
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I got some at the local hose supply store.
-Michael-
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Old 11-14-2006, 05:19 PM   #15
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So, about these waterlines to turbo, there is pressure in the thermostat housing with hot water coming out of motor and considerably less pressure on lower fitting going into water pump.
Hot water goes through turbo and enters back to the motor? Would it be better to connect the feed line on either end of the block (stock car to back of the head and water line rerouted car to original thermostat flange) and return line into radiator side inlet. This way the hot water gets into radiator before entering the motor again.

Or does the pressure difference prevent water from moving through turbo quick enough?

Just trying to understand reason for this routing.

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