Last night I did some boost testing after I ran the Evo 9 at the track and found out that the stock BOV (metal one) leaks at 26psi-27psi.

I recorded a few runs and I did some testing and found out that If I punch it in 5th gear at 60 mph the boost goes to 26psi and sounds like pshs pshhh pshhh pshh several times while it stays at 26psi for a few seconds.

The readings were made on my Defi BF imperial and using the DEFI controller as well(it has a memory card that can record your boost for up to 30 sec then duplicate/play it on the gauge)

By the way, planning on getting a UICP this week on the Evo 9. Any suggestions?
I don't think I will upgrade the BOV at all since the stock BOV hold 26psi and I normally don't run 26PSI. I was running 3 gallons of 101oct last night so I allowed myself to run those levels.

EvO 9 mods:

3"TB,MBC,Dynoflash mail-in,CAI


Carlos

 

if u think about it, that is damn amazing that a OEM bov can hold almost 30lbs of boost

 

buschur uicp kit, cant go wrong but you,ll need a flanged BOV

 

the only real way to test is to do a pressure test on your piping, driving around and listening for leaks isn't a reliable method.

has anyone tried to "crush" these BOV's like the 1g DSM valves yet?

 

What does a leaky stock BOV feel/sound like?

 

The stock plastic one on the eight.

 

keep in mind that it will vary from bov to bov, also... warrtalon has been saying this for forever.

 

Yo man go with the perrin uicp.. You can get it in 3 diff colors, doesnt need a smaller battery and it looks awesome.

 

I agree that pressure testing is the only sure way to determine when it leaks. FYI - I found the plastic stock evo8 bov started leaking at 19psi.

 

You can heard the BOV leaking , it makes a noise like pshhhh -pshhhh-pshhhhh pshhhh-pshhh continuosly and the boost gauge bounces about 1psi down and up, down and up, also you car wouldn't hold any higher boost.

I don't know to explaine it better but it is a very unique sound, it leaks when you are building boost.

Carlos

 

Thanks!! I will look at their website. I just order a LICP from fighters-garage today, they also have a upper Intercooler pipe that does not require a battery kit.

To be honest, I don't think I will be running the 27psi for much longer, just until the 91-101 gas mix last on my tank.

Carlos