Gen V BOV fitting

Detailed descriptions of how to do things to your Liberty.

Gen V BOV fitting

Postby muzza » Sat Dec 10, 2016 1:44 pm

This is a how to for the Reference area.

1. Purchase a new metal body BOV.
Turbosmart Kompact make a Plumback model : TS-0203-1233 or Dual port version if that's your thing:TS-0203-1023.
GFB make equivalent model versions: Plumback Mach 2 TMS T9133, Respons TMS adjustable bias dualport T9033 and the big banana T9533 with electric in-cabin control of venting bias if you really need to... :lol:

2. Best done with the engine cool as you need to work near the radiator and turbo. Under the bonnet the BOV is found on the lower front RHS of the engine (LHS as you stand in front of it) attached to the bottom of the charge pipe that leads up to the intercooler. ImageBOV1 by Murray, on Flickr

3. Start by removing the cool air duct to the air filter housing, then remove the RHS radiator fan (LHS as you stand in front of it) by removing the two top bolts, raise it a bit then undo the plug from the loom. Then get under the car (it doesn't need raising much to access it, approx 30cm of so on a jack and use axle stands under the chassis for safety) and remove the front undertray - 4 bolts and various pop-clips under and to the sides.

4. Now with a bit of room to work you can undo the hose screw clamp (red arrow) between the BOV and the charge pipe from above. Also slide off the vacuum control pipe (blue arrow) that comes in and attaches to the nipple on the RHS of the BOV. ImageBOV3 by Murray, on Flickr

5. Now from under the car, using pliers squeeze the lower spring clip on the bottom of the concertina (recirculating air) rubber pipe that connects the BOV to the intake pipe below it. If you squeeze the clip the right way it will lock open and make life a lot easier. Now you can twist the BOV out of the charge pipe and pull it up off the intake pipe together with the recirculating pipe. ImageBOV4 by Murray, on Flickr

6. Now just transfer the recirculating pipe off the old onto the new and reverse operations. I used a bit of silicone oil spray on the pipes to make it easier to slide them in. Unlocking the spring clip is a matter of gripping with the pliers and twisting them the right way to release the catch.
Voila - fitted new BOV. ImageBOV5 by Murray, on Flickr

7. Don't forget to reattach the vacuum control pipe, refit the fans and reconnect the electrics plug, reinstall the cold air inlet and then reattach the undertray. Try not to leave any left over clips.

8. Go for a drive and check everything runs well, and enjoy improved throttle response.
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Re: Gen V BOV fitting

Postby Adsman01 » Mon Jan 09, 2017 4:27 pm

Sweet! Awesome post Muzza, I'll be doing this next week when I fly home from work so this is more helpful than you know! Cheers brother
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Re: Gen V BOV fitting

Postby HardwareBoB » Tue Jan 10, 2017 7:25 pm

If anyone wants to do this, and needs a BOV to do it, I have a GFB Mach 2 available,brand new, used for 3 days, $120
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Re: Gen V BOV fitting

Postby bluedoors » Thu Jan 12, 2017 11:37 am

How much of a difference do these make on the CVT version?
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Re: Gen V BOV fitting

Postby Whacky_ricer » Thu Jan 12, 2017 9:31 pm

So much more work than on a gen iv :shock:
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Re: Gen V BOV fitting

Postby bluedoors » Fri Jan 13, 2017 10:16 am

HardwareBoB wrote:If anyone wants to do this, and needs a BOV to do it, I have a GFB Mach 2 available,brand new, used for 3 days, $120


Why only 3 days?
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Re: Gen V BOV fitting

Postby muzza » Tue Jan 17, 2017 9:08 am

bluedoors wrote:How much of a difference do these make on the CVT version?


Qué? There are no CVT GT liberties. 5EAT auto.

On CVT XT Forester, GT levorg and WRX it would hold boost better than factory units when they get tired and should also provide improved throttle response when you punch it.
Last edited by muzza on Tue Jan 17, 2017 9:15 am, edited 1 time in total.
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Re: Gen V BOV fitting

Postby muzza » Tue Jan 17, 2017 9:11 am

Whacky_ricer wrote:So much more work than on a gen iv :shock:

Yeah, the low mount turbo (NOT twin scroll) necessitates a low mount BOV. I guess the engineers wanted to vent boost just post turbo plus the intake pipe from the air cleaner is also close by to connect to.
Last edited by muzza on Mon Jul 03, 2017 1:46 pm, edited 1 time in total.
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Re: Gen V BOV fitting

Postby bluedoors » Tue Jan 17, 2017 10:08 am

muzza wrote:
bluedoors wrote:How much of a difference do these make on the CVT version?


Qué? There are no CVT GT liberties. 5EAT auto.

On CVT XT Forester, GT levorg and WRX it would hold boost better than factory units when they get tired and should also provide improved throttle response when you punch it.


Really? i could have sworn that from the 2010 GenV Liberty GT came with CVT
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Re: Gen V BOV fitting

Postby Adsman01 » Thu Jan 19, 2017 11:29 pm

Adsman01 wrote:Sweet! Awesome post Muzza, I'll be doing this next week when I fly home from work so this is more helpful than you know! Cheers brother


Installed yesterday, the instructions here were perfect! Gfb 9133, nice understated sound, not too noticeable.
It feels a little more responsive, mostly just a fun, inexpensive and easy Mod!
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Re: Gen V BOV fitting

Postby Surge » Fri Jan 20, 2017 6:34 am

muzza wrote:
Whacky_ricer wrote:So much more work than on a gen iv :shock:

Yeah, the low mount twin scroll ...


Dont you mean single scroll?

The vf54 in the 5th gen lib is single scroll however the garrett mgt2259s they put in the wrx, forester and levorg is a twin scroll.
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Re: Gen V BOV fitting

Postby Surge » Fri Jan 20, 2017 6:35 am

bluedoors wrote:
Really? i could have sworn that from the 2010 GenV Liberty GT came with CVT


You're thinking of the non turbo.

I've got a 2010 gen V gt and they are luckily a 5eat.
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Re: Gen V BOV fitting

Postby muzza » Mon Jan 23, 2017 10:41 am

Surge wrote:
muzza wrote:
Whacky_ricer wrote:So much more work than on a gen iv :shock:

Yeah, the low mount twin scroll ...


Dont you mean single scroll?

The vf54 in the 5th gen lib is single scroll however the garrett mgt2259s they put in the wrx, forester and levorg is a twin scroll.


Yeah, well that was my received wisdom from reading the internetz but (Edit) having done some searching it looks like the vf54 is single scroll, a development of the vf46 but with some 5 arc scroll design for better low-mid torque (http://legacygt.com/forums/attachment.p ... 1179245648). The main differences are the low mount with short equal length headers, which allows faster spool and uniform exhaust pressure for more efficiency.

I think the misconception arises from the exhaust manifold having two pipes entering an oblong-ish flange that continues into the turbo hot side, which externally could look like a twin scroll.
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Re: Gen V BOV fitting

Postby Surge » Mon Jan 23, 2017 12:42 pm

Yeah it looked like it to me.

Off topic:
I was curious of the mgt2259s is better or a vf54.

Because there is one on ebay with the headers for around $500. And I already have the rest of the wrx exhaust at home.

Heard the mgt2259s is small though.


Back on topic, I also upgraded to a GFB and it sounds much better.

Butt dyno doesn't feel the better throttle response though.
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Re: Gen V BOV fitting

Postby bananabrah » Thu May 23, 2019 9:08 pm

Thanks for the tutorial mate. It was a big help!

I may be imagining it, but I feel like I'm getting a little more performance out of my car post install... however I am also enjoying the drive a lot more... pshhh pshhh! 8)
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