Finally put in the Exhaust Depot pipes!!!

[jag767]

Originally Posted by shabby The pressure in the piping is trying to open it, the pressure in the vacuum line and the spring is keeping the bov closed.

its really not though. the vacuum line literally pulls the BOV open when u let off the gas. ive ran the car this way for 5 days now the oem BOV never opens up nor will it since the vacuum line is capped off. i did this with the hks BOV when it wasnt hooked up and both valves work under the same principle. when the system is has full pressure it holds the valve closed, plus the spring holds it closed as well. on the hks its a similar design and it too holds closed without the vacuum line. when the vacuum line IS hooked up and you let off the pedal is pulls the valve open, releasing the excess boost, and when it is eliminated there isnt anything to hold the valve open from the vacuum line (backpressure eliminated) so it closes. if the vacuum line isnt hooked up there is no way in hell the valve will open. you can say it will all day and i can say it wont but bottom line is ive had it like this for days now and it does not open.

[shabby]

The vacuum line provides both pressure and vacuum to the bov, pressure keeps the bov closed and vacuum helps open it.
The hks bov is different, its a pull type design and doesnt need pressure to keep closed. Unless the stock bov is a pull type design, which i doubt, it works totally different then the hks unit.

Here is a diagram of the stock bov, as you can see its not even remotely the same as the hks bov. The only thing keeping the oem bov closed is the spring, that simply cant hold all the pressure in the piping so it needs additional pressure that the vacuum line provides.

[jag767]

Originally Posted by shabby The vacuum line provides both pressure and vacuum to the bov, pressure keeps the bov closed and vacuum helps open it. The hks bov is different, its a pull type design and doesnt need pressure to keep closed. Unless the stock bov is a pull type design, which i doubt, it works totally different then the hks unit. Here is a diagram of the stock bov, as you can see its not even remotely the same as the hks bov. The only thing keeping the oem bov closed is the spring, that simply cant hold all the pressure in the piping so it needs additional pressure that the vacuum line provides.

apparently the design is varied, however, the spring apparently does have this capability, since it is currently doing so on my car right now and there is no leak. like i said before, i can say its blue and you can say its white but facts dont lie. as tested on my car the facts say that it doesnt leak ergo it doesnt leak. by the way you are neglecting that by capping the vacuum line insert the pressured in the valve will also work in conjunction with the spring to hold it shut. air has ot go somewhere and with the hole closed up it simply cannot.

[shabby]

You're right, this can go on forever. I'll pressurize the intercooler pipes when i get some time and see if the spring in the bov keeps all the pressure in, i know it wont... it cant, but will post my findings.

As for your second comment, the bov doesnt work that way. The air exits back into the intake side, right before the compressor wheel, it doesnt escape thru the vacuum port.

[jag767]

dude i know it will not leak cuz ITS LIKE THAT ON MY CAR RIGHT NOW AND NOT LEAKING AT ALL. how can u try to argue when i am telling you plain and simple whether it should leak or not it doesnt.apparently the spring does provide enough pressure or else i wouldnt be able to consistently put out max boost every time i put the pedal down

[Deepbluegxp]

Sorry to go off topic, I like the way you highlighted the engine cover and battery cover with blue and had clear shot on them.

[jag767]

Originally Posted by Deepbluegxp Sorry to go off topic, I like the way you highlighted the engine cover and battery cover with blue and had clear shot on them.

thank you very much. i tried something different on mine and instead of using the high heat paint for the lines and letters i used one shot pinstriping paint. i wanted to test it out on mine before i offered it to anyone since i didnt know how it would work out and turns out as long as u do it AFTER you clear the pieces it comes out fine. however if you try to clear over the one shot is wrinkles and looks like dog meat, i had to do the blue twice to cover the wrinkles since i did not know this haha. but yea it definitly stands out more

[MikePhDPE]

i remember reading a thread where they replaced the spring for a higher rate spring so that it wouldn't open under higher boost. you may just have a strong spring that can take all of the boost without openning. however someone else may have a slightly weaker spring that may open near max boost.

[Deepbluegxp]

Originally Posted by jag767 thank you very much. i tried something different on mine and instead of using the high heat paint for the lines and letters i used one shot pinstriping paint. i wanted to test it out on mine before i offered it to anyone since i didnt know how it would work out and turns out as long as u do it AFTER you clear the pieces it comes out fine. however if you try to clear over the one shot is wrinkles and looks like dog meat, i had to do the blue twice to cover the wrinkles since i did not know this haha. but yea it definitly stands out more

Last time off topic, I used to paid for Virginia Beach Jet Ski and Cycle. There is a rule for painting. Acrylic Laquer paints can be sprayed over Enamel, not the other way. Since Laquer doesn't have a hardner, other paints have thinners which cause the wrinkle effect (desovling the paint). Good info for your next paint project. Enamel pain hardens as it dries and laquer can be applied over top with no problems. Don't spill any brake fluid/gasoline on laquer either. I had to learn the hard way when I first started painting aircraft back in the early 80's.

[DEJON-Dave]

Originally Posted by MikePhDPE i remember reading a thread where they replaced the spring for a higher rate spring so that it wouldn't open under higher boost. you may just have a strong spring that can take all of the boost without openning. however someone else may have a slightly weaker spring that may open near max boost.

We sell a stiffer spring on our web site

[jjhmln]

what's the gain over stock?? can you feel it ?? when you get on the gas??

[jag767]

Originally Posted by jjhmln what's the gain over stock?? can you feel it ?? when you get on the gas??

definitly spools up faster, but its now exceedingly obvious the limiting our ecu is doing. i now get 14-15 pounds instead of 19-20. so yes once the tune is out it is a nice gain

[Exhaust Depot]

Shabby,

Its the spring plus the boost that keeps the valve closed, learn more here on the 4th paragraph:

http://www.exhaustdepot.net/edalmodlesslag.html

Also you do not need a stiffer spring. This is identical to the SRT4 setup and though many have claimed it to leak under higher boost, it never did. Infact i have seen plenty of 25psi (the kids boost it more than what you needed to make power, at this level you make 0hp on stock turbo) You can verify it for your self by building a boost leak tester which you pump up air through your turbo inlet and check for leaks.

[Chuck]

I have the HKS BOV with the ED IC pipes and Fijuta CAI, also Magnaflow Cat Back. Never throw any code due BOV. Did due CAI Filter till I got an AEM dry filter.
Can't understand why you have this problem.
Hector...Why is this happening. Any idea?

[shabby]

Originally Posted by Exhaust Depot Shabby, Its the spring plus the boost that keeps the valve closed, learn more here on the 4th paragraph: http://www.exhaustdepot.net/edalmodlesslag.html

I know that, its jag that thinks the spring is enough to hold the bov shut under boost.