BEGi bypass valve VTA
 

Soooo, this may be a little rice buuuuutttt, i have my bypass valve venting to atmosphere. I do have the mspnp so im map based. Are there any downsides to it? I mean, it does have air blowing out of it at idle.

it sounds pretty sweet though.

If your worried about the engine sucking in dirty air from the BOV,just put a small K&N filter on it.

are you serious?

i need to see someone with that,

its not sucking in air, its blowing out. is that normal?

Yes I am serious.

FM use to supply the small K&N filters for the BOV as part of the turbo kits.

but if it blows air out, whats the worry?

id put a filter on it

Chances are it'll leak at idle and suck in unfiltered air.

at idle it is open, but air is blowing out of it.

Some people are just ---- about the fact the engine might suck in unfiltered air.

Ummmm ... are you sure about that? Where is your BOV located?

the bov is right before the TB. and yes, when the throttle is closed, there is vacuum that opens the valve and the turbo is blowing air through it.

This my just be me being stupid, but you might just be leaking mad boost, i did that to my aunts evo because she wanted the sound and then she complained about it being slow, tested it with a camera inside the engine bay(a bit daft i know, but cool video, ill upload it some day), sho'nuff it was VOMITNG boost like it was going out of style. i know some are bypass and some are blow off but if it came intended to be used as a bypass, i dun think u can use it vice versa

Translated into Dutch on Babelfish, and back to English:

This my only is me that stupid is, but you crazy increase only are able leak, did I that to my tantesevo because they the sound wants and then they concerning complained that, tested it with a camera within the crazy motorbay(a beetje I know, but cool video slow am, sick upload one or other day), sho'nuff were increase VOMITNG if it assumed style. I weet what is traffic diversion and what are blow away but if it came planned for are used since a traffic diversion thinks, I thinly you can vice-versa using

God it's late. I'm getting delirious.

well, its closed when the throttle is open so, im going to say im not leaking boost. It sounds like you dont understand what kind of bypass valve im talking about.

You wouldn't happen to have a teeny tiny turbo with an AbsurdFlow exhaust that makes boost at idle would you?

i have a gt2860rs with stock exhaust(i know stock exhaust right, im broke lol)

edit: gt2860rs

Your turbo isn't pushing anything at idle, the engine is sucking. Creating vacuum ....

hmm... i think i may see the problem here, i didnt have the idle air tube hooked up, that would mean that the motor was not sucking idle air through the piping but from outside, therefore making a little bit of positive flow in the piping. That also means it was sucking unfiltered air.

That would make me feel better i KNOW that there was air blowing out of the bypass valve.

But you're sucking in unfiltered air through your idle air tube...

yeah, i mean, i know, i will be fixing it and see if that changes the situation any.

Thank you for the gay-ality check
ive had two root canals done today, and im more than slightly impaired
the only thing that comes to my head for that stupidity is 'SIR!, NO EXCUSE, SIR'

Its possible for a turbo to pressurize the intake piping and intercooler, if equipped, against a closed throttle-plate but there will most likely be low load situations when this isn't the case.

I think it should be open.

There is a spring that sits atop the valve and presses down to keep it shut. The MAP signal pushes in the same direction as the spring, and competes against the pressure in the charge pipe.

If charge pressure > spring + map, the upward force wins and the valve opens.

If charge pressure = map (open Throttle), the is charge pressure below the valve is canceled by the map signal atop and the spring keeps it shut.

At idle the throttle is closed, the turbine is spinning, and the MAP signal is a strong vacuum. It's no surprise the valve is open.



Even with a fairly large turbo (certainly by most of your standards: a holset hy35), I have noticed it moving air at idle. On a 1.8 idling at about 800rpm I've placed my hand in front of my compressor outlet, heard the air fight to pass through the suddenly disconnected charged pipe (this one happened a lot), and placed a finger in front of the BOV. Things we all can do, right?

GOD DAMN stupid fucking rash of NOOBS today opening up 3 week old posts for no fucking reason!!!

Sam, I read Opek's post and immediately thought of your response to that other guy yesterday.

We all can confuse the current board and our search, especially when unrelated threads like this sneak in.