Greedy type rs question

[slonkey]

Have a type rs and had it rec. when I took the hose off and blocked the intake part my bov don't whistle. Never really did, just thought the "bov whistle" was real loud. It just sounds like I popped a tire when I let out boost. Any help?

 

[DSMReviver]

Bud you might want to read up on how bov works.

 

[007jimmy]

If you want to hear a whistle go buy the HKS BOV and put the purple insert in it...

You really should recirculate the BOV.

 

[boosting88]

Type rs bov does not make a whistle sound. It makes a whoosh sound. Like a bunch of air escaping. Sorry bud your bov will not whistle.

 

[4Lurker4]

The whistle is just a byproduct anyway. As long as it works, that's all that matters.

 

[NHerron]

If you end up not recirulating like you should, at least adjust the BOV correctly so as to not suck in dirt through the BOV when manifold pressure is low (closed throttle)

You need a boost gauge (also reads vacuum) and recommended to use one of those hand vacuum pumps "MityVac"

A boost gauge will tell you the lowest pressure reading during decel since closed throttle + high deceleration will yield the lowest vacuum possible on the car. Example, my car idles 19inHg and on deceleration I get 23inHg. Take the MityVac and apply "x"inhg (your recorded lowest manifold pressure on decel) to the BOV signal line. Look to see if valve has or hasn't opened. If it has, adjust through the locknut and threaded rod by tightening until it's closed.

Or keep it simple. Let the car idle and check to see if the BOV valve is opened. If it is, tighten the BOV until its closed and THEN give it 2 additional turns.

 

[vl4bad]

So what your saying is have it set all the way to hard, or all the way to soft... how about if its set in between both?

 

[Bud92gsx]

http://www.dsmtuners.com/forums/art...96-how-vent-your-blow-off-valve-properly.html

 

[NHerron]

So what your saying is have it set all the way to hard, or all the way to soft... how about if its set in between both?

Not sure what you mean.

Basically just idle the car, adjust bov until its cracked open, THEN give it a turn or two clockwise past that point (tighten) and the BOV should remain closed even during high decel. Make sure you don't have any boost leak, either

Otherwise your BOV might be open and suck in unfiltered air during decel. Cranking it down tight can also cause obvious problems like, compressor surge

Not 100% sure on this but I know stock ECU turns off injectors during decel so I'm thinkin the turbo shouldn't be spooling nearly enough to make any boost. Thus, the IC pipes would still be at least a little under atmospheric pressure, AKA pressure differential and the BOV sucks in unfiltered air

 

[nek]

Your spring only helps keep your bov closed underload. So you set it at ide, loosen it until its open, then tighten it two turns to keep it closed under load.

Btw, type rs doesnt wistle, type s does.

To above, wrong. The engine still takes air at a vacuum just not nearly as much. The spring pressure closes the bov after you release air. All air should come from the air filter or your car isnt running right.

Under load, Intercooler pipe pressure < spring pressure +intake manifold pressure so bov stays closed
Under decel/shift IC > spring pressure + intake manifold vacuum (pressure becomes negative) so bov opens
After release Im vacuum < spring pressure so bov closes. At this point your ic piping is 0psi for all intensive purposes.

 

[stacked1G]

just recirc your bov, if your really dead set on venting out, get a gm maf/maft in blow through mode and do it correctly.

when venting to atmousphere without the proper maft setup, your car will run rich between shifts due to the air being let out is unmetered, your maf thinks that air is going back into the intake, therefore causing it to run rich between shifts etc..

 

[slonkey]

If you end up not recirulating like you should, at least adjust the BOV correctly so as to not suck in dirt through the BOV when manifold pressure is low (closed throttle)

You need a boost gauge (also reads vacuum) and recommended to use one of those hand vacuum pumps "MityVac"

A boost gauge will tell you the lowest pressure reading during decel since closed throttle + high deceleration will yield the lowest vacuum possible on the car. Example, my car idles 19inHg and on deceleration I get 23inHg. Take the MityVac and apply "x"inhg (your recorded lowest manifold pressure on decel) to the BOV signal line. Look to see if valve has or hasn't opened. If it has, adjust through the locknut and threaded rod by tightening until it's closed.

Or keep it simple. Let the car idle and check to see if the BOV valve is opened. If it is, tighten the BOV until its closed and THEN give it 2 additional turns.

Thanks for that help but it's nt that I have a gauge that goes both ways like that and I sit around the same as u. And it's just when I first started I had it Rec but it was hitting fuel cut on stock boost. I opened it and now even on 15 psi it won't hit fuel cut.

Thanks everyone but it's all set right and I know I'm new to this stuff and DSM but I still know what I'm talking about. It is set right an I just thought it was the rs that whistles not the type s.

 

[NHerron]

Your spring only helps keep your bov closed underload. So you set it at ide, loosen it until its open, then tighten it two turns to keep it closed under load.

Btw, type rs doesnt wistle, type s does.

To above, wrong. The engine still takes air at a vacuum just not nearly as much. The spring pressure closes the bov after you release air. All air should come from the air filter or your car isnt running right.

Under load, Intercooler pipe pressure < spring pressure +intake manifold pressure so bov stays closed
Under decel/shift IC > spring pressure + intake manifold vacuum (pressure becomes negative) so bov opens
After release Im vacuum < spring pressure so bov closes. At this point your ic piping is 0psi for all intensive purposes.

Had a hard time following this but the BOV spring job is to keep the valve portion completely closed during times when IM manifold pressure is its lowest (or vacuum highest) and also HELPS the valve stay shut while boosting because spring pressure + boost pressure in the intake manifold also goes to the BOV signal line. Same pressure on each side of the valve plus additional pressure provided by the spring

What is the pressure in the IC pipes during idle (or decel)? I figure the turbo is not spinning much if it all, so the engine kind of becomes N/A thus absolute pressure in pipes is lower than atmospheric. If that's the case it would result in unfiltered air being drawn through the BOV if not adjusted correctly

 

[slonkey]

Had a hard time following this but the BOV spring job is to keep the valve portion completely closed during times when IM manifold pressure is its lowest (or vacuum highest) and also HELPS the valve stay shut while boosting because spring pressure + boost pressure in the intake manifold also goes to the BOV signal line. Same pressure on each side of the valve plus additional pressure provided by the spring

What is the pressure in the IC pipes during idle (or decel)? I figure the turbo is not spinning much if it all, so the engine kind of becomes N/A thus absolute pressure in pipes is lower than atmospheric. If that's the case it would result in unfiltered air being drawn through the BOV if not adjusted correctly

It sits around 20vac idle and I can hold psi. Decel it sits around 23vac

 

[nek]

Had a hard time following this but the BOV spring job is to keep the valve portion completely closed during times when IM manifold pressure is its lowest (or vacuum highest) and also HELPS the valve stay shut while boosting because spring pressure + boost pressure in the intake manifold also goes to the BOV signal line. Same pressure on each side of the valve plus additional pressure provided by the spring

What is the pressure in the IC pipes during idle (or decel)? I figure the turbo is not spinning much if it all, so the engine kind of becomes N/A thus absolute pressure in pipes is lower than atmospheric. If that's the case it would result in unfiltered air being drawn through the BOV if not adjusted correctly

Even if the pressure of the ic pipes is lower then the patmospheric the bov stays closed because of the spring, which causes you to suck air in through the filter. The bov should only be open between shifts to release pressure.
What you forget is the turbo is not the only thing pulling air in. Thats why there is a vacuum on the intake manifold side of the tb.

 

[NHerron]

If the BOV is mis-adjusted enough loose or too light of a spring you can bet the BOV will be opened during a certain vacuum. TiALs website shows you how to properly pick a BOV spring according to engine idle vacuum, so this doesn't happen

Selecting Tial Spring

BOVs

**OP**, I don't know if you've seen this yet but there is a guide exactly for your application, maybe that can help?

Type RS on a 2G Eclipse (click that link which downloads as a small PDF file)
http://www.greddy.com/tech-support/turbo-related