No blow off? Greddy type S

[chronicvex]

Ok it was working before..... I finally tap'd into jpipe for MBC. took off BOV because i was going to switch, but put back on and now theres no blow off. I screwed it out almost all the way and still basicly no blow off.. i mean a couple times I heard a quiet vacuum blow off but thats it... I boost leak tested and all that and its good... Can anyone help me? Thanks

 

[jjrock5]

Are you saying that you teed the MBC to the bov line? because that's the very reason you don't want to do that, it'll bleed off boost and lose bov performance.

 

[chronicvex]

No it was set up like that before and worked/sounded great.. now I tap'd into jpipe for MBC and hooked up both of the nipples on blow off valve how its supposed to be.

 

[GsXdSmKingGsX]

If its not recirculated I bet your having compressor surge.

 

[chronicvex]

its recirculated, if by that you mean is it still connected to intake.

 

[jjrock5]

Both nipples on the bov? You don't use both nipples. You leave the bottom one vented to atmosphere and the top one goes to your vacuum line.

 

[chronicvex]

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althoguh i just realised I tap'd into the line from wastegate instead of line from jpipe... When I had small nipple just vented... it had sluggish response...

still doing same thing and now its exactly like that picture... I guess ill try with venting smaller nipple.... I have it screwed out almost all the way... Is my BOV fubar'd?

yea.... tried with small nipple vented.. still only hear a very quiet vacuum blow off

 

[99gst_racer]

Remove the line from the MBC going to the lower port of the Type-S. It's not needed at all.

 

[chronicvex]

I tried that already, didn't change anything

 

[99gst_racer]

So, is the BOV not opening, or not closing? Have you verified that the diaphragm is not damaged?

 

[chronicvex]

diaphram? Well its holding boost so I'm assuming its not opening....

im about to just take this b!tch apart...

 

[viprez586]

That diagram is completely incorrect above.



Here's what you want.
<img src="http://www.dsmtuners.com/gallery/files/7/2/2/1/8/simple.bmp" alt="Mbc For Idiots" />

 

[chronicvex]

I dont see the difference between the two? I dont see where you have the small nipple going if you included that at all? Thanks

 

[viprez586]

You want the bov to have a single untouched vacuum/pressure source from the intake manifold

Same for your wastegate.

Don't connect both the lines on the bov, use the top hat one.

 

[chronicvex]

ok well thats how its set up atm, still same problem...

I'm going to do another boost leak test tomorrow, maybe I missed something.... If I can't find anything I guess I'm going to try going back to my 1g BOV