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Old 01-12-2004, 03:03 AM   #1
Kostamojen
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Question Turbo Q: Can you use the Throttle Body coolant lines for the Turbo?

I was just thinking, since the coolant lines for the throttle body really are not required for engine operation, and everyone seems to do the coolant bypass mod, can the lines from it be used for the coolant for the turbo? I dont know if ive seen anyone do this (never really thought about it til now) but I was just curious... The lines are like in the perfect place too.
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Old 01-12-2004, 03:21 AM   #2
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Should work ok. I live in a cold climate though. SO I'll leave mine in place
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Old 01-12-2004, 04:22 AM   #3
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I wouldn't think that it flows enough. For my friends car we just put a t into each heater core hose and used the same size hose.
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Old 01-12-2004, 04:39 AM   #4
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It flows through the throttle body, no?
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Old 01-12-2004, 04:59 AM   #5
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Quote:
Originally posted by Kostamojen
It flows through the throttle body, no?
eh?
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Old 01-12-2004, 09:24 AM   #6
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Quote:
Originally posted by kaos200
I wouldn't think that it flows enough. For my friends car we just put a t into each heater core hose and used the same size hose.
This is pretty typical. I think the best setup I'd seen was the old JC Sports kits where they had short tee's and just put a small section of hose between the heater core hoses and the block outlets for them, with the tee on there. Non-destructive to the hoses and gets a good amount of feed.

I, too, think that it won't be enough flow.
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Old 01-12-2004, 09:26 AM   #7
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Quote:
Originally posted by kaos200
I wouldn't think that it flows enough. For my friends car we just put a t into each heater core hose and used the same size hose.
That's what I did too. It seemed to be best.
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Old 01-12-2004, 03:15 PM   #8
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I have mine going through the turbo into the TB. I has plenty of flow, ive blown the lines off the turbo while driveing (HUGE MESS) . My tempature has never gone up, and seems to work fine.

When I did mine, I drain some fluid, then took the hose from the coolent channel to the TB and cut it. I then went out and bought... 3/8 but not positive, and put the existing hose all the way into the 3/8 hose. After stugling with it for a while, i got both hoses on the barb fitting on the coolent channel then repeated the same thing for the TB.

I hope this helps, if you need pics, i can get some for you.

Poogie
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Old 01-12-2004, 05:20 PM   #9
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Quote:
Originally posted by PoogieLayne
I have mine going through the turbo into the TB. I has plenty of flow, ive blown the lines off the turbo while driveing (HUGE MESS) . My tempature has never gone up, and seems to work fine.

When I did mine, I drain some fluid, then took the hose from the coolent channel to the TB and cut it. I then went out and bought... 3/8 but not positive, and put the existing hose all the way into the 3/8 hose. After stugling with it for a while, i got both hoses on the barb fitting on the coolent channel then repeated the same thing for the TB.

I hope this helps, if you need pics, i can get some for you.

Poogie
Sure, pics would be awesome. I would think the flow would be fine considering they are coming straight from the coolant bridge, and have to flow through the throttle body with some sort of pressure.
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Old 01-12-2004, 06:45 PM   #10
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My AVO kit goes through the TB coolant lines...No problems yet.

Tats.
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Old 01-12-2004, 10:02 PM   #11
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I Retract my statement. I have found out recently that its a bad idea to run the line that way and could cook the turbo. I will now be switching the way i run my lines.
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Old 01-12-2004, 10:50 PM   #12
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Quote:
Originally posted by PoogieLayne
I Retract my statement. I have found out recently that its a bad idea to run the line that way and could cook the turbo. I will now be switching the way i run my lines.
Did that information just magically occur, or did you have a source?
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Old 01-12-2004, 11:09 PM   #13
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It may be that the return line could go back through the throttle body without problems. Then again, I think I would want to keep the throttle body cool as much as possible.

Brent
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Old 01-12-2004, 11:42 PM   #14
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Ya, that would be kindof contrary to the whole intercooling thing, keeping the air going into the engine cooler...
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Old 01-12-2004, 11:52 PM   #15
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Quote:
Originally posted by Kostamojen
Ya, that would be kindof contrary to the whole intercooling thing, keeping the air going into the engine cooler...
I'm not exactly sure what the coolant lines in the TB are for, but I'm guessing its not much to do with intake air temps? The coolant temp is going to be much warmer than the air temps (or at least it should be) so I can't imagine it being used to cool the air charge as intercooling does.
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Old 01-12-2004, 11:57 PM   #16
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No, its used to keep the throttle body warm at startup. But with a rather hot turbo sitting right there, and hot air from the turbo ended up in the engine anyway, i dont think that keeping it hot is really that neccessary (IE keeping it cool would be better, thus my comment)
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Old 01-13-2004, 02:13 PM   #17
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Unsung boxer has told me last night that its made to heat the air going in the engine at old tempatures and there is a valve in there that is supposed to shut after the engine warms up. once the vavle closes, there is no more coolent that pases through it therefore no more coolent going through the turbo.

I just found this out last night and am no going to change the way its run and go to the heater lines.

Sorry to confuse you.

Poogie
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Old 01-13-2004, 04:18 PM   #18
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can u post pics of the lines " heater " and how they are tapped pics would be helpfull thanks
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Old 01-13-2004, 05:35 PM   #19
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Quote:
Originally posted by PoogieLayne
Unsung boxer has told me last night that its made to heat the air going in the engine at old tempatures and there is a valve in there that is supposed to shut after the engine warms up. once the vavle closes, there is no more coolent that pases through it therefore no more coolent going through the turbo.

Poogie
Valve? What valve? In the throttle body? Cause I dont see one in the Coolant bridge or in the line that the coolant runs back into the coolant lines... I dont see any valves...
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Old 01-13-2004, 07:00 PM   #20
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Its what ive been told. Im not looking to mislead people. Ill check some diagrams tonight to see what i can find.
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Old 01-13-2004, 08:40 PM   #21
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The throttle body gets coolant from the left and right cylinder block so its hot and its purpose is to heat up the area around the butterfly so ice doesn't form and make it stick. It should be obvious why a sticky TB is bad. I do believe there is a valve of some sort in the TB that controls coolant flow.
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Old 01-13-2004, 08:46 PM   #22
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Like I told Poogielane, i dont htink it will overheat a turbo, considering a turbo can run just fine w/o the coolant lines to it at all.

I belive the throttle body lines are too restrictive, and you are messing with a system that is supposed to keep hte throttle body from freezing in cold weather.

Im not sure how Subaru does it, but on Honda's the valve to the throttle body closes when the car becomes warm... if this is the case with subaru, and you tapped that line for the turbo, it would shut coolant off to the turbo when the car warms up. As it seems from reading this thread, this is not likely the case. Although, I still feel the TB Warmer Line is too restrictive.

Just my theory, I was discussing it w/ poogielane, thus i think he is semi-confused.

The heater hoses seems to be the best source for coolant tapping, IMO

-Jake

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Old 01-13-2004, 09:21 PM   #23
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I dont know what the diameter for the TB coolant line feed is, but I agree I think its small for comfort. If indeed it does flow enough coolant than I dont think there is an issue, as the coolant circuit always delivers to the TB, its just sometimes closed off on the return. The heater core hoses are just about as large as you are going to get. Just make sure you tap the heater core feed for the turbo feed otherwise if you tap the return you will only get coolant when you have your heat on!
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Old 01-13-2004, 09:33 PM   #24
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are you guys running your turbo inline w/ your heater hose, or in parallel?

I got to thinking about this, because if its in series, it will restrict your flow to the heater, but if its in parallel, it wont necessarily flow past the turbo... not sure what to think about this.

-Jake
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Old 01-13-2004, 09:47 PM   #25
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why wouldn't if flow to the the turbo when in parallel? There's a decent amount of pressure in the heater lines so I highly doubt that's an issue. I also don't think it would restrict flow if it was in series either. Again the pressure in the coolant system pushes it along and I don't think the turbo is going to reduce flow that much.

As far as making sure you pick the correct line to tap, that's not an issue if you use both the supply and return from the same system. If you take the supply from the heater and use the return from the TB it might be a problem, but that's a pretty odd way of routing things.

Edit: Mine are in parallel with the heater lines.
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