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Old 08-17-2012, 04:56 PM   #1
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Default Coolant Reroute - Turbo and heater, tell me I'm an idiot.

So, someone explain here why it's an idiotic idea to route the turbo coolant to the heater, and from there to behind the thermostat.

I *know* there's a reason it's stupid and no one does it, I just haven't managed to figure it out yet.
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Old 08-17-2012, 06:40 PM   #2
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I made a thread kinda like this like 3 years ago. It was deemed stupid. Also I'm sure you have it reversed, since it flows the opposite direction. Also if your turbo is higher than the heater outlets you end up with FAIL.
search my threads...you'll findit
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Old 08-17-2012, 07:07 PM   #3
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Quote:
Originally Posted by 18psi View Post
I made a thread kinda like this like 3 years ago. It was deemed stupid. Also I'm sure you have it reversed, since it flows the opposite direction.
Coolant flows from after the thermostat, to the heater, to the turbo, to the waterpump? Color me surprised, I had assumed it flowed from the waterpump, to the turbo, to the heater, to after the thermostat in this situation.

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Also if your turbo is higher than the heater outlets you end up with FAIL. search my threads...you'll findit
My turbo isn't higher than my heater outlets by any means. I would be shocked and surprised if someone could manage to get their turbo higher than their heater outlets on a Miata platform, in fact! I'll try searching your threads, but MT.net's search function has gone full retard lately. It's nigh-impossible to find this sort of thing.

(Edit) If it's this thread - https://www.miataturbo.net/general-m...i-crazy-39802/ - then I'm failing to understand how our ideas are similar. MS paint illustration incoming!

(Edit 2) Illustration is below. My best guess is that the issue is that the heater restricts flow from the turbo as to why it would fail.

Attached Thumbnails
Coolant Reroute - Turbo and heater, tell me I'm an idiot.-18psi-illustration.png  

Last edited by blaen99; 08-17-2012 at 07:21 PM.
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Old 08-18-2012, 03:45 PM   #4
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Anyone?

Talked to an experienced mechanic yesterday, he was pretty confident it *should* work - which surprises the hell out of me, but still.

The only problem I can think of is that the heater may restrict too much flow from the turbo.

Last edited by blaen99; 08-18-2012 at 04:53 PM.
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Old 08-19-2012, 04:46 AM   #5
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Well, one last update and attempt to be dissuaded before I try it.

My only concerns are twofold at this point.

Causing the heater to get so hot to cause a fire/something to melt/etc. However, there is a limit to how hot the water can get before it boils in a system, and if the water exiting the turbo doesn't hit this, I don't think I need to be particularly concerned.

The other concern is just if the heater restricts too much flow to properly cool the turbo, but considering water cooled turbos can only be ran with oil...I don't know if this should be a concern.

Last chance to talk me out of being a moron guys.
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Old 08-20-2012, 10:01 AM   #6
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The turbo gets hot, but there isnt much area in there to heat the water, nor much mass to the turbo to hold heat. So the coolant doesnt heat up much while lowing the temperature of the turbo.
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Old 08-20-2012, 10:07 AM   #7
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Quote:
Originally Posted by blaen99 View Post
Well, one last update and attempt to be dissuaded before I try it.

My only concerns are twofold at this point.

Causing the heater to get so hot to cause a fire/something to melt/etc. However, there is a limit to how hot the water can get before it boils in a system, and if the water exiting the turbo doesn't hit this, I don't think I need to be particularly concerned.

The other concern is just if the heater restricts too much flow to properly cool the turbo, but considering water cooled turbos can only be ran with oil...I don't know if this should be a concern.

Last chance to talk me out of being a moron guys.
I'm either seriously confused, or we're talking about different things, or something even more fail, but:

are you suggesting that water goes FROM the mixing manifold, to the turbo, to the heater, to the back of the head or return plumbing of your re-route?

or are you suggesting it flows from a tee in the return hose on the re-route, to the heater, to the turbo, back into the mixing manifold?
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Old 08-20-2012, 11:28 AM   #8
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The wording of the question has me confused as to what he is planning to do as well. The "from"s and "to"s don't add up to the way the coolant moves in the system. Why not take the little line from the back of the thermostat, go to the turbo with it, then take the line coming from the turbo and go to the little inlet on the mixing manifold next to the A/C compressor?

BTW, the heater circuit requires more flow than the chra will easily allow. This flow keeps the coolant from stagnating at the back of the head so much.
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Old 08-20-2012, 01:16 PM   #9
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Quote:
Originally Posted by 18psi View Post
I'm either seriously confused, or we're talking about different things, or something even more fail, but:

are you suggesting that water goes FROM the mixing manifold, to the turbo, to the heater, to the back of the head or return plumbing of your re-route?

or are you suggesting it flows from a tee in the return hose on the re-route, to the heater, to the turbo, back into the mixing manifold?
Hence why I illustrated it. I am taking water from post-water pump pre-thermostat, and returning it post-thermostat pre-water pump, see MS Paint illustration.

Quote:
Originally Posted by sixshooter View Post
The wording of the question has me confused as to what he is planning to do as well. The "from"s and "to"s don't add up to the way the coolant moves in the system. Why not take the little line from the back of the thermostat, go to the turbo with it, then take the line coming from the turbo and go to the little inlet on the mixing manifold next to the A/C compressor?
Because modified. No more inlet.

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BTW, the heater circuit requires more flow than the chra will easily allow. This flow keeps the coolant from stagnating at the back of the head so much.
Damnit. This is what I was afraid of. At the current state of the Miata, this is the only way I have to get hot water to the heater. I ******* hate teeing anything, but I may be stuck teeing something at this rate.

P.S. Please remember I have a full reroute already and it works great, I am just trying to figure out how to route the water with it to the heater.
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Old 08-20-2012, 03:36 PM   #10
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So your heater circuit isn't still hooked up in the normal fashion?

What about your factory oil cooler's water circuit?
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Old 08-21-2012, 01:09 AM   #11
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Quote:
Originally Posted by sixshooter View Post
So your heater circuit isn't still hooked up in the normal fashion?

What about your factory oil cooler's water circuit?
Oh Six, you ******* rock. Factory oil cooler water outlet in the back of the head is perfect. Thank you so much.
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Old 08-21-2012, 05:11 PM   #12
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Glad to help. If you are keeping the cooler, I'd run the water to the turbo after the water goes through the oil cooler, otherwise you might be heating your oil instead of cooling it, lol.
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Old 08-21-2012, 05:49 PM   #13
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Quote:
Originally Posted by sixshooter View Post
Glad to help. If you are keeping the cooler, I'd run the water to the turbo after the water goes through the oil cooler, otherwise you might be heating your oil instead of cooling it, lol.
94 block. So block outlet to turbo, to return.

Back of head oil cooler outlet to heater, to behind thermostat/in front of pump.

And I'll probably just buy the FM oil cooler kit, I've been planning on an oil cooler anyways, so it works great.

Thanks again Six!

Last edited by blaen99; 08-21-2012 at 06:11 PM.
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Old 08-22-2012, 01:46 AM   #14
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So, anyone know the size of the oil cooler outlet in the back of the head?

Finding the right combo of words to search and/or google is really hard for some reason with this particular subject. :(
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