Forge BPV installed, lost boost pressure??? HALP!

[serialtoon]

I put on a Forge BPV i bought from a friend about a month ago. I never really paid attention to my boost gauge after the install. About 3 days ago ive been feeling like its not boosting like it used to so i was watching the boost gauge like a HAWK and boom...4-6 gears i get 14.5 PSI boost. If i recall correctly, on my stock BPV i was getting 15.5 PSI on those gears. Anyone else notice this? Can i be leaking boost somewhere?

 

[mazdaspeedster3]

What springs/shim combo are you running and what mods do you have? I immediately got an increased boost hold of 15.5 with the Forge, blue spring and two shims...

 

[serialtoon]

What springs/shim combo are you running and what mods do you have? I immediately got an increased boost hold of 15.5 with the Forge, blue spring and two shims...

I have a Cobb SRI, boost gauge and Forge BPV. I also have the mid resonator removed about 6 months ago. It doesnt matter what i use, they are all the same pressure. yellow w/ 2 shims, red, blue, shims...no shims...all the same. As of right now im running Yellow with 1 shim as it feels the smoothest in my opinion.

 

[Kain]

Have you tried putting the stock BPV back on and monitoring boost then?

 

[serialtoon]

Have you tried putting the stock BPV back on and monitoring boost then?

Im gonna do that today as soon as i get off work. What im affraid of is an exhaust leak. would that screw up my boost also? How hard is it to fix?

 

[mazdaspeedster3]

Yellow is pretty weak. with that SRI Forge suggests blue with 2 shims or red no shims.

 

[serialtoon]

Yellow is pretty weak. with that SRI Forge suggests blue with 2 shims or red no shims.

*cought*ilosttheblue*cough*. Im gonna try red, no shims and report back. Can you tell me what an exhaust leak would sound like? :-D thx alot btw.

 

[Kain]

If the leak is large enough, you'll hear it. It'll be like a whistle when you give it gas. If the leak is small, you may need to do some detective work. Lift the car off the ground (remember to use the e-brake and chocks when only lifting the front), leave the car idling, take a thin rubber tube and use it like a stethoscope, running it along flanges, and listen for a faint whistle. Or, you can fill a spray bottle with water and dish soap and spray the flanges and look for bubbles.

 

[serialtoon]

If the leak is large enough, you'll hear it. It'll be like a whistle when you give it gas. If the leak is small, you may need to do some detective work. Lift the car off the ground (remember to use the e-brake and chocks when only lifting the front), leave the car idling, take a thin rubber tube and use it like a stethoscope, running it along flanges, and listen for a faint whistle. Or, you can fill a spray bottle with water and dish soap and spray the flanges and look for bubbles.

Nice, im gonna go and install my stock BPV today and test the boost. If its still at 14.5 then im gonna do this exhuast test to see if the guy that cut my resonator screwed me so i can complain to him. :-D Ill be responding again once i get the bpv installed. thanks alot fellas!

 

[Jasnall]

Can you tell me what an exhaust leak would sound like? :-D thx .

swhhhhhhhhhhhhhpshssswswwsssswsswssssss(dunno)

 

[serialtoon]

swhhhhhhhhhhhhhpshssswswwsssswsswssssss(dunno)

So useful! Thanks! (jerkit)

 

[stockms3]

swhhhhhhhhhhhhhpshssswswwsssswsswssssss(dunno)

]useless info but I loled!

 

[serialtoon]

To the people that actually helped, i removed the Forge BPV during lunch time to inspect it and it all seems fine. I decided to go with the yellow spring and no shims due to the fact that i know im not going over 23 psi. I will continue to test it and will be installing the stock BPV in about 2-3 hours. Once again, thanks to those who are helping.

 

[ZyrehT]

i know im not going over 23 psi.

Those numbers are estimates only and different per application. Forge says so. I'm blue w/two.

 

[ZyrehT]

So useful! Thanks! (jerkit)

You asked somebody to tell you how something should "sound" in a forum and you're giving him crap?

 

[ZyrehT]

also, Did you make sure you put the o ring back inbetween the BPV and flange?

 

[serialtoon]

also, Did you make sure you put the o ring back inbetween the BPV and flange?

O- Ring is there. I ran the blue spring with 2 shims and it felt like the car was jerky in between 1-2 shifts and 2-3. Right now i have Yellow and 2 shims which seems to be working a bit better. Im getting 15.5 for sure now. Perhaps i just needed to reseat it.... i dunno. Thanks for the help tho, i really appreciate it.(band2)

 

[Rotus8]

Check out this thread. There might be something there that will halp you with this.

 

[ZyrehT]

O- Ring is there. I ran the blue spring with 2 shims and it felt like the car was jerky in between 1-2 shifts and 2-3. Right now i have Yellow and 2 shims which seems to be working a bit better. Im getting 15.5 for sure now. Perhaps i just needed to reseat it.... i dunno. Thanks for the help tho, i really appreciate it.(band2)

One reason it might seem smoother is you're probably bleeding more boost during your shifts, with the heavier spring it helps hold during shifts.

 

[Rotus8]

One reason it might seem smoother is you're probably bleeding more boost during your shifts, with the heavier spring it helps hold during shifts.

This is incorrect. With the heavier spring, the valve will be closed more during shifts causing more backpressure to the turbo. The turbo will slow down more and then take more time to spool up after the shift.