hey guys..i have a question..i had my forge recirculation valve installed one way and I was getting flutter everytime I would let off the gas hard and like a choking feeling also...so then i reversed the recirculation valve as I was told to do..and the fluttering went away for the most part..but on the highway if i'm doing about 80 and boost a little bit then let off the gas fast i get a lot of flutter still and a choking feeling..I have just a high flow filter and adapter as my intake and then the bov..I dont know why it would be doing this..should I just put my stock back on and hope it doesn't leak? or what can I do to stop the fluttering..thanks

 

u bov isnt opening fully under low boost, i think... tweak it some more, or sell it and go with a greddy type s w/ the single spring mod, like i have

 

which spring r u using? how many psi r u boosting?

 

i'm boosting 19.5 psi..i dont know which spring..i bought it used from a guy in mass and i'm using whatever spring he was..probably the one that came with it since he didnt give me any other springs (meaning he probably didn't buy the spring package that you can buy..) i mean i COULD check if really necessary but I would have to yank it out first and open it up...someone said to adjust it..how do i adjust a recirculation valve? it doesn't have an option of venting to the atmosphere..it basically just replaced exactly the stock bov..what spring should I have in there by the way also for 19.5 psi? thanks guys

 

I have the same problem, but I thought it was normal. I currently have the yellow spring on with no washers.....some said to use the Green one, I think I will try...does anyone else know about this or how it can be fixed....all I have as an K&N Filter with adpater as well....

 

anyone? its really annoying the hell out of me..i just want some help!

 

Why the single spring on the greddy type-s? I've been looking into getting one of those...just curious.

 

the single spring mod allows the bov to open under low boost conditions instead of turbo flutter, if i remember correctly, turbo flutter being very bad in the long run, lol. only downside is ull get a minor boost leak if u have a boost controller kicking it up to over 22 i think? hell, i traded a dude with a gst straight up for his greddy for my hks ssqv... i didnt change the settings or anything except the spring mod and it works perfectly (minus the fact that i installed it backwards at 1st, lol)

 

https://www.evolutionm.net/forums/sh...t=forge+spring


found more info..i guess i should have researched first gotta open up my bov now..pain in the *** lol but worth it so i dont get compressor surge..thanks guys

 

If u r boosting 19.5 psi, try the yellow spring with one or two shimes. The blue spring will fold 19.5 psi for sure but it might give you more flutter also. So try it out. hope this help. Also be sure the hose clamps are tight.

 

OK i just installed the Blue spring, I had the yellow installed which was the 2nd softest spring that had LOTs of flutter. With the Blue spring, the flutter has significantly reduced. I have only a RmR Intake, no intake piping. I read the other link of posts about this issue and it seems that I never really got a straight answer from them, but it seems that green or Blue are the best for the EVO. I hope this helps and I will keep you posted if the blue springs gives me issues.

 

OK here is my results of using the Blue Spring.....although the Flutter seemed to seize at high RPM, but as usuel depending on throttle postion and how you lift off the gas, the flutter is there. It seems that I have to reve the engine just a bit harder to get the blow off sound, and its not as long or loud. This makes sense since the blue spring is stiffer than what I had in there before (Yellow). Personally I think I may go back to Yellow witha washer for jsut a bit of stiffer feel but not to much (hopefully) since U have never tried using the washers provided by Forge. I will keep you posted, as I want te revive this issue, and get a defintive answere from FORGE as to what is there recommended spring setting for the EVO VIII. If anyone has opinoins on this matter PLEASE post them, more info the better....

 

i was getting a lot of flutter with my forge too..i took it out today and put the stock one back in..and i'm getting even more flutter!! i dont understand what is wrong..it's the stock bov! my friend had a greddy bov and he got some flutter even tho the day before he installed his mini battery there was no flutter..then he totally took apart his intake and the hose connected to the turbo and put it back on and he said the flutter was gone..could installing my adapter and high flow filter caused me to get flutter? that is so weird..but i dont know what else it could be because now i have the stock bov and it's still doing it..someone help please..i dont want to hurt my car..and the sound is really annoying..the stock bov is holding just fine to redline with my MBC too..so i dont know what my problem is someone please help! i'm posting this is its own post too just thought i'd add it here..

 

ps. i'm checking what spring i have in my forge right now..but i dont think it has anything to do with the spring since my stock bov is doing it too but it never did it when i got the car..

 

why did u trade away the ssq? doesn't the smaller valve on it provide the blow off needed under low boost that your trying so hard to acheive with all that spring switching, while all the time possibly damaging the bearing?