Subaru Legacy Forums

Subaru Legacy Forums (http://legacygt.com/forums/index.php)
-   Fifth Generation Legacy (2010 - ) (http://legacygt.com/forums/forumdisplay.php?f=92)
-   -   [DIY] Throttle Body Coolant Bypass. (http://legacygt.com/forums/showthread.php?t=204150)

JLGT 03-22-2013 01:28 AM

[DIY] Throttle Body Coolant Bypass.
 
Throttle Body Coolant Bypass
2010 Legacy GT

Socket 12mm
Flat Head Screwdriver

-Remove the engine cover.

-Remove 12mm bolt and loosen worm clamp.
http://i1305.photobucket.com/albums/...psebf6aa90.jpg

-Remove 12mm bolt and loosen worm clamp.
http://i1305.photobucket.com/albums/...ps1745f3fd.jpg

-I find it easier to fully remove the right-side intercooler bracket.
http://i1305.photobucket.com/albums/...psb628b45b.jpg

-Remove the TMIC.

-Mark the top of the throttle body to intercooler hose so you know which way it goes back on when you are done (I just used a black marker). Also loosen the worm clamp and remove the hose.
http://i1305.photobucket.com/albums/...ps0320dbc9.jpg

-Completely remove the hose in red and remove the left side of the hose connected to the throttle body (yellow). You will lose a small amount of coolant.
http://i1305.photobucket.com/albums/...ps42cc85e6.jpg

http://i1305.photobucket.com/albums/...ps630a71a0.jpg

-For this part you can either cut the factory hose or purchase another hose to use. I chose to cut the factory hose.
http://i1305.photobucket.com/albums/...ps17f8570c.jpg

-Connect the cut end of the hose to the area where the previous hose was that we removed earlier.
http://i1305.photobucket.com/albums/...ps3778fdba.jpg

-That’s it, you can now put back the TMIC reverse of the above process. It may be a slight pain but it can be done, just take your time. Start your car and check for leaks, you will lose a small amount of coolant from the above process but not much.

Hepy117 03-22-2013 04:42 AM

May be a stupid question but is there an advantage to this?

orndog 03-22-2013 05:09 AM

Quote:

Originally Posted by Hepy117 (Post 4353707)
May be a stupid question but is there an advantage to this?

For the people that want their intake charge as cool as possible. The coolant flowing through there is meant to warm it up in cold weather. I did this on my '03 OBS and drove it in 0 degree temps at 70mph and never had an issue. In fact, it was my first and only write up on Scoobymods.

GTEASER 03-22-2013 09:40 AM

Nice write-up and pics JLGT!!

nadracer 03-22-2013 09:47 AM

Quote:

Originally Posted by orndog (Post 4353713)
For the people that want their intake charge as cool as possible. The coolant flowing through there is meant to warm it up in cold weather. I did this on my '03 OBS and drove it in 0 degree temps at 70mph and never had an issue. In fact, it was my first and only write up on Scoobymods.

A lot of cars have this coolant tube going through the throttle body. It's a basically a free intake mod you can do and most of the time you don't need a new hose just move the existing one. I've done this to my ford and my last two Hondas and never had a problem. Could I quantify it? No, it's more piece of mind that its one less thing to warm up the air going into the engine any more than it has to.

GTEASER 03-22-2013 10:05 AM

Is it something that an emission inspection would pick up? In other words, before inspection, should it be re-plumbed back to stock?

islandborn 03-22-2013 10:18 AM

Living in Texas - Houston.... this is quite an idea! I struggle with the concept of "coolant" warming something :confused:

Perscitus 03-22-2013 10:24 AM

Quote:

Originally Posted by GTEASER (Post 4354148)
Is it something that an emission inspection would pick up? In other words, before inspection, should it be re-plumbed back to stock?

Nope. Done this on a few cars. No issues with inspection or emissions checks in PA, CT or NY for example. And yep, even well below freezing, never had a problem. Gains? You might notice some on a 2.5GT. No real difference on a 2.5i or 3.6R I can think of.

Rutchard 03-22-2013 10:52 AM

I highly doubt this mod would fail a visual inspection in any state. It's all tucked in under the TMIC nobody would see it unless they were going over the car with a fine toothed comb.

orndog 03-22-2013 11:06 AM

Quote:

Originally Posted by GTEASER (Post 4354148)
Is it something that an emission inspection would pick up? In other words, before inspection, should it be re-plumbed back to stock?

It doesn't affect emissions, the extra heating is purely an 'in case you move to Siberia" thing :lol:

Quote:

Originally Posted by Perscitus (Post 4354210)
Nope. Done this on a few cars. No issues with inspection or emissions checks in PA, CT or NY for example. And yep, even well below freezing, never had a problem. Gains? You might notice some on a 2.5GT. No real difference on a 2.5i or 3.6R I can think of.

No gains really, I prefer to think of it as "cutting losses". You make your best power in perfect conditions, the extra heating makes for worse conditions so doing away with it puts you a little closer to ideal.

dgoodhue 03-22-2013 01:27 PM

I did this mod on my Corvette and it noticably cooled my throttle body (it went from very hot after driving awhile to only slightly warm). That car did have a 3/8" ID hose going to he tb. I did it on my Nissan Maxima and it screwed up my idle on days below 50 degrees.

JLGT 03-22-2013 03:15 PM

Also forgot to add, this is a good time to take off the rubber fart hoses if you haven't already. Mine were removed months ago.

http://legacygt.com/forums/showpost....1&postcount=37
http://legacygt.com/forums/showthrea...highlight=fart

GTEASER 03-22-2013 03:26 PM

^^Yes, this.

I am just waiting for the Racer-X Charge Pipe / Throttle Body Hose Kit, that way I just take the OEM ones off and put new pretty ones on.... and don't need to fart around....LOL.

Kaijubei 03-22-2013 03:41 PM

So are you saying the engineers did it wrong when they routed that coolant line the way they did?

GTEASER 03-22-2013 03:51 PM

:lol::lol::lol::lol::lol::lol:

No Kai, it's a mod. And if you don't agree with it, you can choose not to do it.

It's like you questioning if all of us on the forum, by changing out our OEM RSB to a bigger one, are in fact claiming that the engineers at Subaru designed the OEM one incorrectly. Not the case at all, it's just that there is another, more performance oriented, option to choose, that is rooted in the same sound engineering that the Subaru engineers use, just from a little different perspective. There are multiple ways to do things most of the time.


All times are GMT -6. The time now is 07:14 AM.


LegacyGT.com