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Resolved Idle issues BOV cap

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coloradotuner

coloradotuner

Proven Member
118
11
May 20, 2013
Schererville, Indiana

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If the bottom was blocked off there's no way air can get passed to the valve. Really strange and have no clue why someone would do that. Unless maybe to do a boost leak test and just forgot to take it back off LOL. Or it was leaking really really bad, and they figured blocking it off was a good idea.
 
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Well, that would be the only OEM 2g bypass valve that doesn't leak!

coloradotuner said:


What are the effects of capping this?
​
Click to expand...

The biggest issue is compressor surge (which you have described). The turbo will experience premature bearing wear/failure if it hasn't already.

As RiceBandit suggested, the metal Evo IX bypass valve installs on the 2g without modification.

Part number: 1545A001

Used should be $40-60

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Just wait til you put that on! When I swapped to the evo from stock it was like driving a new car. I can't even imagine how yours will feel. How much shaft play do you have?
I remember reading a post months ago about either blocking the BPV or flipping it. Can't remember which. I think the poster said something about doing it on a VW.
 
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PlanZero said:
Just wait til you put that on! When I swapped to the evo from stock it was like driving a new car. I can't even imagine how yours will feel. How much shaft play do you have?
I remember reading a post months ago about either blocking the BPV or flipping it. Can't remember which. I think the poster said something about doing it on a VW.
Click to expand...

Damn dude! Still, the turbo shaft moves in and out prob like a 1/4 inch but no side to side play, spins freely and effortlessly, Wonder if it was capped for a reason? possibly to prolong the life of the engine? I have been trying to search this to no avail, all the threads that keep coming up are just about kids venting their BOV to the atmosphere.

My car still made Blow off noise, It still pulled hard, The OE boost gauge was workin, Honestly would have never of noticed the powerade cap if I didn't start looking for potential reasons for idling problems..

I'm still not convinced,Why would the previous owner do this?

I might just put it back on there save myself the 200$ unless someone on the forums can help a fellow DSM enthusiast out:heystupid: and send me a evo VIII, or IX BOV for cheap?
 
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I have an old greddy you can have. Its an actual greddy an not a knockoff. Im heading to blue mesa in two weeks, i can bring it with me. Or if you wanna pay for shipping i can ship it off. Just let me know.
 
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Yeah, definitely do not put that POS back on. There's not even a side nipple.
I believe it's only the later evo 9 and 10 that had the metal BPV.
But if Hotncreamy (rotfl) will donate the GReddy setup take it. That's what I started with, then down the line I was able to upgrade to a universal fmic diy kit using the Greddy upper pipe no trimming of the bumper or cutting of the pipes necessary.
 
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My turbo has a considerable amount of back and forth/ in and out play, no side to side or up and down play. I have been driving the car for about 2 years now like this. no smoke out the back or anything.

I know the turbo is hurting but What other ill effects of this capped BOV should I be worrying about.? Once I put the 1g BOV on there is the turbo just gonna blow? With the 2g BOV capped, The car was pulling hard, but turbo was making crazy sputtering noise at higher RPM's.

I have been trying to search but I don't think I am getting to language right, because its just threads upon threads of newbies wanting to vent to atmosphere or how to make their BOV's louder, I just don't wanna end up like Iwannagofast89 the "wow this sucks" thread.

Should I look into replacing the turbo? Will a new BOV and added boost hurt my engine or push the turbo to far?

I really need answers
 
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That turbo must be dead, or on its last legs. I'm suprised its not smoking out a storm. In and out play is bad, much more than side to side. At minimum, you should be looking at replacing both.

If thats your turbo in the picture, that compressor wheel is toast. Luck for you, t25s are cheap to replace.
 
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coloradotuner said:
the turbo shaft moves in and out prob like a 1/4 inch but no side to side play, spins freely and effortlessly
Click to expand...
Your turbo is badly, badly blown...like, "the thrust plate no longer exists" blown. There should be ZERO in/out shaft movement.
 
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