Forge BPV question? Green Blue or Yellow Spring? No red?

[tru-boost]

you are surging or you have valve flutter .....??? those are 2 totally different things. if it just sounds like the valve quickly open/closing you are fine leave it be. if it sounds like this..............
http://s11.photobucket.com/albums/a194/craighjr/?action=view&current=MVI_2891.flv
that is surge and you have a problem. i have never, or even heard of someone getting compressor surge with the blue spring, even with shims.

 

[Jesse MS3GT]

When I have two shims in I get a very small amount of flutter when letting off the throttle completely @ full Boost 5k+ RPM. No shims no flutter. Im thinking of going with one shim just because flutter PING! sounds kind of annoying.

 

[wisniaPl]

its when im cruising around in like 4th gear doing 45mph and when having 3k rpms floor it and let of around 3,5k rpm or 4 and is like surge but it soundslike half of air is coming out of bov and you can hear small surge i have idea when cruising i wont floor it will go gentle an you can hear air coming out of bov very nicely
I have pingsound is liek wssshhh ping is it bad?

 

[wisniaPl]

made video firs one is with no shims i think 3rd and 4th gear



second one is with 2 shims same gear i gues because fisst and second dont have this sound



Is it surge or valve flutter??

 

[tru-boost]

that is flutter...hands down. you are not surging at all. the truth is, you want to hear flutter from the valve. if your spring is too loose and the valve makes a very clean sound that means you are venting your boost too fast. that is the safest thing for the turbo, but the worst way to set it for performance. if the spring is too stiff the valve wont vent at all, or very little. that is what causes compressor surge. the idea is to be set as stiff as possible without surge. the "flutter" is a good indication that you are right in the middle of too tigh and too loose......perfect !

 

[mckraut]

(deadhorse
c'mon guys......SEARCH
stock up to about 19psi = blue spring
over19psi = red
yellow = you are a wuss !

Excuse me for pointing out what the manufacturer's website says. I know what the damn forums say, I'm just curious why the company website contradicts what we already know.

 

[wisniaPl]

so i can run with 2 shims??

 

[shadrag]

Excuse me for pointing out what the manufacturer's website says. I know what the damn forums say, I'm just curious why the company website contradicts what we already know.

Company website = old
Person from company posting on forum = newer

 

[mckraut]

Company website = old
Person from company posting on forum = newer

Ahh, well shame on Cobb. Update your site guys!

Thanks for clearing that up.

 

[SharkDiver]

I ordered the forge BPV and will try the blue spring with no shims..wish me luck..

 

[wisniaPl]

so i can run with 2 shims??

????

 

[SharkDiver]

Im guessing if you have to use 2 shims you just need to go up 1 spring and use no shims.

 

[wisniaPl]

Im guessing if you have to use 2 shims you just need to go up 1 spring and use no shims.

so I should try red spring??

 

[SharkDiver]

From reading what tru boost says,You should be ok where you are at with the blue spring and no shim..i guess you could try putting 1 shim in and see what happens.Im just going by what I been reading because I dont have the bpv yet so Im just guessing.

 

[wisniaPl]

I put 2 shims and its the same I showed on video one is with no shims second one with 2 shims

 

[SharkDiver]

I got mine today and it came with the yellow spring installed.I put the blue spring in with no shims and it seems to be perfect..Also right now my car is all stock besides the cai because I have to take my car to the dealer for service again.I may try the yellow spring just to see what happens in the next few days.On a side note when I push in on the valve on the stock bpv it is much harder then pushing in on the forge valve with the blue spring.I dont know if that matters.I havent got to do to much testing with it but it does seem to hold boost a little better and longer.I dont know if my stocker was leaking but Im just making my car more ready for the AP when it gets here since the boost will be a bit higher then.

 

[SharkDiver]

Wisnia..After listening to your videos again I dont seem to hear that ping sound that the forge makes..It does it with mine.I dont know if that means anything or not.Maybe mine is set wrong but it makes the ping sound and the whoosh sound.

 

[wisniaPl]

Wisnia..After listening to your videos again I dont seem to hear that ping sound that the forge makes..It does it with mine.I dont know if that means anything or not.Maybe mine is set wrong but it makes the ping sound and the whoosh sound.

I have ping sound but not as loud as without shims my gf say it like in blacksmith shop i think you should go with 2 sims I might try red spring to eliminate valve flutter
I was driving very easy to show strange noise that i though it was surge

 

[fructus]

I've gradually raised it from blue to blue with 1 shim, and then 2 shims, and the valve seems to be working fine, no flutter nor surge. Peaked at 19 psi in the sixth gear.

 

[SharkDiver]

19psi with no boost controler?That dont sound right.You may have it to tight.We will see what other people think.