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Old 06-18-2020, 05:45 PM   #26
snow_bound26
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Quote:
Originally Posted by kenliu84 View Post
Also, if you could please take pics of the size of the fitting as that seems to be a debate in regards to it's effectiveness.


I knew someone would eventually make me post pictures in here 🤦*♂️
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Old 06-18-2020, 06:20 PM   #27
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Originally Posted by snow_bound26 View Post
I knew someone would eventually make me post pictures in here 🤦*♂️
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Old 06-18-2020, 06:21 PM   #28
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Originally Posted by car_freak85 View Post
I purchased one of Dom's kits as well as the equivalent OEM part (two engines, you see). The OEM nipple has a much larger ID, but I have an in-line restrictor if the heater doesn't blow hot enough.
Not sure if this info was shared in the other thread about the Dom kit but this is good info. Thanks.
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Old 06-18-2020, 06:28 PM   #29
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Quote:
Originally Posted by kenliu84 View Post
Not sure if this info was shared in the other thread about the Dom kit but this is good info. Thanks.
It was.

Dom ID: 10mm iirc
Subaru ID: 12.7mm
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Old 06-18-2020, 08:51 PM   #30
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So the OEM plug is now NLA (no longer available), in the thread they mentioned it is an M20x1.5 thread that adapts a barb fitting. From the pictures of the 4 kits above it looks like nothing is special on the side that threads into the block, so couldn't we just use something like this and find our own hose and tee fitting?

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Old 06-18-2020, 10:51 PM   #31
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Quote:
Originally Posted by viper_crazy View Post
It was.

Dom ID: 10mm iirc
Subaru ID: 12.7mm
Thanks.

And from that thread, which one was causing issues with the heater? I thought it was the Dom one but don't want to keep repeating false info if it wasn't.

Quote:
Originally Posted by thejaredhuang View Post
So the OEM plug is now NLA (no longer available), in the thread they mentioned it is an M20x1.5 thread that adapts a barb fitting. From the pictures of the 4 kits above it looks like nothing is special on the side that threads into the block, so couldn't we just use something like this and find our own hose and tee fitting?

interesting thought and find
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Old 06-18-2020, 11:56 PM   #32
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Originally Posted by kenliu84 View Post
Thanks.



And from that thread, which one was causing issues with the heater? I thought it was the Dom one but don't want to keep repeating false info if it wasn't.
I don't honestly remember, to be honest. My memory, too, says it happened with Dom's kit. It would likely happen with whichever kit you use, in that case.

Subaru's line went through a left side turbo, crossed over the engine to the turbo expansion tank and spliced in to the right side turbo coolant line. There's probably a reason they didn't use either of the heater core lines.

Last edited by viper_crazy; 06-19-2020 at 11:27 AM.
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Old 06-19-2020, 12:00 AM   #33
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Old 06-19-2020, 06:35 AM   #34
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Quote:
Originally Posted by viper_crazy View Post
I don't honestly remember, too be honest. My memory, too, says it happened with Dom's kit. It would likely happen with whichever kit you use, in that case.

Subaru's line went through a left side turbo, crossed over the engine to the turbo expansion tank and spliced in to the right side turbo coolant line. There's probably a reason they didn't use either of the heater core lines.


This makes me wonder if it would be worth modifying to follow the same route.
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Old 06-19-2020, 09:37 AM   #35
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Originally Posted by snow_bound26 View Post
This makes me wonder if it would be worth modifying to follow the same route.
I was thinking the same...
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Old 06-19-2020, 09:39 AM   #36
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Originally Posted by cdska View Post
and matches the ID of the Dom fitting too
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Old 06-19-2020, 12:07 PM   #37
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Here is a visual for those interested. Path is highlighted in red to help make it easier to follow. Subaru used a hard line as part of the cross over, but a long piece of coolant hose would do fine. I don't see any reason why you couldn't secure it under the intercooler as well, away from clutch slave/moving parts/etc.
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Old 06-19-2020, 03:16 PM   #38
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Looks like it just Ts with the other turbo before returning to the expansion tank
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Old 06-19-2020, 04:24 PM   #39
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Quote:
Originally Posted by cdska View Post
Good find, I was looking for that as I knew it would be a standard piece but it didn't show up for me yesterday.

Relevant info, because ebay changes their url all the time:
M20 M20X1.5 Male to Barb Hose ID 3/8”

Most real hardware stores (not home improvement centers) would have something like that.

Found it for $6 shipped on ebay
https://www.ebay.com/itm/Fitting-Met...kAAOSwd59e4Y5G

I guess the parts list would be, FWIW 3/8" is pretty much 10mm (9.525mm):
M20 x 1.5 to 3/8" barb - $6+
3/8" T fitting - $2+
3/8 ID heater hose/coolant line, maybe like 1.5-2 ft?

Should cost about $20.

I also think it would be better to run it to the coolant reservoir for the turbo, no reason to mess around with the heater core and all the potential loss of heat that might ensue, also it would help with the people that aren't running HVAC at all.

Last edited by thejaredhuang; 06-19-2020 at 04:39 PM.
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Old 06-19-2020, 05:00 PM   #40
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Originally Posted by thejaredhuang View Post
I also think it would be better to run it to the coolant reservoir for the turbo, no reason to mess around with the heater core and all the potential loss of heat that might ensue, also it would help with the people that aren't running HVAC at all.
That's a good point. If you have no heater core, you could plum the hose to the HC return if it's still installed, and obviously, no need for T'ing into any lines.
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Old 06-19-2020, 05:17 PM   #41
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waiting for someone to diy and post the results pls...
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Old 06-19-2020, 06:20 PM   #42
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Originally Posted by murrdogg24 View Post
waiting for someone to diy and post the results pls...
There are a lot of results in the main thread when Dom released it:
https://forums.nasioc.com/forums/sho....php?t=2882734

It's been shown to work and have good results. I think the point of this specific thread is to discuss the differences between the kits/DIY solution. I was going to post the fitting i found in that thread but its full of clutter and personal attacks.
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Old 06-19-2020, 06:26 PM   #43
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Quote:
Originally Posted by thejaredhuang View Post
There are a lot of results in the main thread when Dom released it:
https://forums.nasioc.com/forums/sho....php?t=2882734

It's been shown to work and have good results. I think the point of this specific thread is to discuss the differences between the kits/DIY solution. I was going to post the fitting i found in that thread but its full of clutter and personal attacks.
Yeah im interested in the DIY version, with it being plumbed back into the coolant reservoir, because I live in a cold environment I don't want to lose my heater capability
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Old 06-19-2020, 06:54 PM   #44
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Quote:
Originally Posted by viper_crazy View Post
Here is a visual for those interested. Path is highlighted in red to help make it easier to follow. Subaru used a hard line as part of the cross over, but a long piece of coolant hose would do fine. I don't see any reason why you couldn't secure it under the intercooler as well, away from clutch slave/moving parts/etc.


I'm not up to speed on which way the coolant flows. With the standard kit everyone is making, is coolant pulled from the heater core return line? Or, does the return line create suction that pulls coolant out of cyl 4? I ask because if I were to tie into the upper reservoir, I want to make sure everything is flowing in the proper direction. If it will be then I will try this out and write up a DIY. I'm putting my car back together right now so I am in the perfect position to experiment.
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Old 06-19-2020, 07:54 PM   #45
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From what I gathered it flows from the front of cyl 2 and exits between 2 and 4, leaving the other three quarters of cyl 4 with stagnant coolant. There is a plug behind cyl 4 that would create an extra path for coolant to flow through. Please correct me if I'm wrong.
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Old 06-20-2020, 02:01 AM   #46
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Quote:
Originally Posted by thejaredhuang View Post
From what I gathered it flows from the front of cyl 2 and exits between 2 and 4, leaving the other three quarters of cyl 4 with stagnant coolant. There is a plug behind cyl 4 that would create an extra path for coolant to flow through. Please correct me if I'm wrong.
Basically, this.

Coolant will flow out cyl 4 port that these kits are using. Same deal with Cyl 3, so coolant from both sides will flow to the turbo expansion tank. Nick @ Subaru Only on YouTube actually has a three part video on coolant flow.

Which reminds me. One thread I read mentioned another kit T'ed to the heater supply line...possibly feeding hot coolant to the heater core to mitigate the reduced heater performance?? No one seemed to know for sure, though. I can see why using the heater core lines is appealing as they are so close but I'd personally prefer Subaru's routing.

Last edited by viper_crazy; 06-20-2020 at 02:08 AM.
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Old 06-20-2020, 02:40 AM   #47
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I DIYed mine on my two vehicles because I couldn't purchase it from Dom as he was out of stock. No issues.

I used the barb from ebay as linked above, a stainless steel T that had 5/8" to 5/8" with a 3/8" outlet on the T, and put it directly into the return to the heater core. Generic coolant line (Gates)

Last edited by cdska; 06-20-2020 at 02:46 AM.
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Old 06-20-2020, 06:59 AM   #48
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Quote:
Originally Posted by viper_crazy View Post
Basically, this.

Coolant will flow out cyl 4 port that these kits are using. Same deal with Cyl 3, so coolant from both sides will flow to the turbo expansion tank. Nick @ Subaru Only on YouTube actually has a three part video on coolant flow. https://youtu.be/fMqLYXntnIc

Which reminds me. One thread I read mentioned another kit T'ed to the heater supply line...possibly feeding hot coolant to the heater core to mitigate the reduced heater performance?? No one seemed to know for sure, though. I can see why using the heater core lines is appealing as they are so close but I'd personally prefer Subaru's routing.


Thanks for posting this. I'm going to route mine to the upper reservoir and see how it goes.

The Vems kit arrived last night so I'll pull it out today and do a write up on how I'm setting mine up.
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Old 06-25-2020, 11:34 AM   #49
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Is this a mod that should be done for a oem engine , not tuned in any way to extend the life of the Head Gasket and Engine?
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Old 06-25-2020, 01:59 PM   #50
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Quote:
Originally Posted by murrdogg24 View Post
Yeah im interested in the DIY version, with it being plumbed back into the coolant reservoir, because I live in a cold environment I don't want to lose my heater capability
I'm running the DIY (OEM Fitting) kit and the heater works just as good as before. In fact I couldn't perceive any difference.
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