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Old 11-05-2009, 09:59 PM   #1
MB38
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Default BPV recirculation hose kinked

Hey guys,

I have a 2006 WRX with a Perrin inlet hose and a VF39 [among other things]. When I originally installed all the toys, I had a hard time getting the BPV recirculation hose onto the fitting on the Perrin inlet hose. It took a hell of a lot of work, but I managed to slip it on eventually.

Unfortunately, there was something of a kink in the hose that was causing a rather amusing turkey call/little girl squealing sound when the BPV releases [I have an APS intake, so the BPV sound is quite loud]. Similar to when you hold a blade of grass in between your thumbs - that whistling sound was happening because the hose was too kinked to allow adequate airflow.

I've been hearing some compressor surge when I let off at full boost, so I finally got around to ripping it all apart to fix today. I took a few pictures to illustrate the arrangement of everything.

The main issue is that the DBW throttle body wedges into the hose and crushes it. While the hose may look adequate here, when the TB is installed, the hose has to be crushed more than it can deal with.

How in the hell should I route this hose [given the tight space it's in] so that it flows enough? How is it routed stock?

Thanks all...





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Old 11-05-2009, 11:40 PM   #2
Blackout713
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hello, quite a few people have kinked bpv return hoses, but yours is quite similar to mine. i also have a perrin turbo inlet hose, but lets not blame companies, because i like perrin products. Anyways, i just got a 45 degree elbow fitting and stuck it into the inlet hole which allowed me to reroute the bpv return hose a little differently. it was probably 80% kinked before i did this and now it's not kinked at all.

I loved the supra JHOO JOO JOO sounds it made letting off the pedal but i found that while in boost if i were to let off the gas then floor it again, it would bog pretty bad. pm me and i can run you through what to do to fix this issue. it was a pain.

others do a 90degree throttle body flip.
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Old 11-06-2009, 09:49 PM   #3
MB38
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PM'd...
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Old 11-09-2009, 08:42 PM   #4
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Based on Blackout's advice and a trip to Home Depot, here's the fix. I found this great 45˚ 1" copper pipe that gets narrow in the middle. The ends are perfect for fitting into the inlet hose and return hose, but the middle is skinny enough that it doesn't interfere with the hard lines just below where the connection is. I hacked about 1.5" off of the end of the return hose and stuffed it all in there.

There's pressure on the hose [it's not 100% free floating], but there's much much more airflow now. The BPV has gone from the obnoxious squeal with occasional surge to inaudible unless I'm at full boost... perfect!

My idle's a little wonky right now coming off of throttle, even after resetting the ECU. If it persists, I'll load up a different map to see what the deal is. I'm going to guess it's a relearning thing.

I've heard of a few other people having this issue on their inlet hoses. Perrin should start including these copper pipes!


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Old 11-09-2009, 11:57 PM   #5
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Quote:
When I originally installed all the toys, I had a hard time getting the BPV recirculation hose onto the fitting on the Perrin inlet hose. It took a hell of a lot of work, but I managed to slip it on eventually.
Same deal on my Legacy. I had wondered if the crappy fit was due to the part being originally intended for an Impreza, but now we know that Perrin just has a hard time making parts that fit.
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Old 11-10-2009, 03:54 AM   #6
MB38
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That little copper pipe is about $3.50... anybody who struggles with a Perrin inlet install ought to pick one up.
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Old 11-10-2009, 08:28 AM   #7
dmcutter
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Had the same issue with my Gimmick inlet hose. I think someone needs to come up with an inlet hose specific to the DBW models. In the meantime, this looks like a good fix.
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Old 11-10-2009, 02:41 PM   #8
gtasti
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yea same prob with the gimmick so its not just perrin
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Old 11-10-2009, 09:57 PM   #9
Baay
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Lol any of you tried putting on the Perrin 3inch inlet? you want to see horrible fitment, try putting that pos on, hardly sits right on the turbo, get squished by the TGV runner (yes even with no motors/TGV system), gets in the way of the intake bolting back down correctly, then finally to top off the frustration, squishes against your power steering pump.

APS, you guys suck for not sending more hard pipes over, look what you made me do, i broke down and picked up a 200$ piece of silicone that probably works better as toilet plumbing tube.
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Old 11-11-2009, 11:57 PM   #10
MB38
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Even the APS has issues that plague it... namely the silicon hose between the pipe and the turbocharger.

Methinks the easy answer is "go rotated". Now if only my transmission wouldn't explode on a GT3076.
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Old 11-12-2009, 12:14 AM   #11
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My APS went on pretty easily. We had the intake manifold completely off the car at the time though, which created its own headaches.
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Old 11-12-2009, 12:14 AM   #12
magicstop
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Yep. We have Subaru to thank for this, not the aftermarket companies attempting to deal with it.
I had a decent fit w/ my Perrin unit. It was hell getting the BPV return hose on the inlet, and I couldn't reuse the stock clamp, so I picked up a hose clamp at Carquest and stuck that on in addition to the one provided by Perrin.
I don't have the crimped hose issue you're having . . . I'm not sure why, but I'm going to look tomorrow to see how mine is different. But I AM getting that annoying noise/compressor surge when letting off of low boost, or letting off the boost slowly. I think it's altitude related for me, though, as I installed the inlet at sea level and it sounded great, but up around 8000-9000 feet, it starts sounding horrible, lol.

EDIT: I may not have the same problem b/c I'm on the 2.0, but I'm still going to take a peek tomorrow.
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Old 03-30-2014, 08:40 PM   #13
gurusan
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Any chance someone can post pics of how they routed the BPV hose? I installed a gimmick/godspeed turbo inlet and the recirc port on the inlet totally interferes with the DBW connector.
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Old 03-31-2014, 09:30 PM   #14
gurusan
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Ok...I used the 1" copper 45 degree bend tip and some "coaxing" and got the recirc hose connected. Here's a pic for anyone struggling in the future.

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Old Yesterday, 06:11 PM   #15
pigboat_2
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I can't really believe that this design flaw has gone so completely unnoticed. I installed a Gimmick piece onto my car and this has been giving me a headache since step one. Now, I have literally had to sort out half a dozen other fitment/PITA issues in the meantime but I have finally returned to this problem and it just seems so fundamentally wrong for Perrin/Gimmick, etc to not have a hard pipe on the inlet for the recirc hose to clamp over.


Clearly, the lack of this necessitates the hose to be moved over by 1-2 full inches and therefore directly interferes with the DBW assembly. Upon installing my hose, it's probably 80-90% pinched off and that certainly is unsatisfactory for me. I'll be returning to home depot for the 5th time to pick up one of these 45* elbows with my fingers crossed.

At least I'm not the only one. Thanks all for your struggles and help.
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