Fluttering sound from BOV - Page 5 - Subaru Impreza GC8 & RS Forum & Community: RS25.com

**George of the Jungle** · 11-27-2006, 08:15 PM

the BOV is set too high. it's not opening fully. the spring is too tight. the turbo is not forcing enough air into the BOV to make it open all the way. it's probably only gettin about half open and surging back into the turbo.

you need an adjustable one, or turn the boost up so it has the pressure enough to open the BOV completely.

**George of the Jungle** · 11-27-2006, 08:28 PM

double post...

VAUGHNB19 · 11-28-2006, 07:36 AM

Quote:

Originally Posted by George of the Jungle

the BOV is set too high. it's not opening fully. the spring is too tight. the turbo is not forcing enough air into the BOV to make it open all the way. it's probably only gettin about half open and surging back into the turbo.

you need an adjustable one, or turn the boost up so it has the pressure enough to open the BOV completely.

i think i'll just get a new bov..boost is already at 6psi.....

VAUGHNB19 · 11-28-2006, 07:39 AM

anyway i wnet to the shop...no bolt..it was actually a nut i thought was missing but it was all fine...so yeah im gona try getting new bov

ACraPPyRS · 11-30-2006, 12:16 AM

Quote:

Originally Posted by George of the Jungle

the BOV is set too high. it's not opening fully. the spring is too tight. the turbo is not forcing enough air into the BOV to make it open all the way. it's probably only gettin about half open and surging back into the turbo.

you need an adjustable one, or turn the boost up so it has the pressure enough to open the BOV completely.

I'm sorry to have to do bring this thread back from the dead but there still something I'm not understanding.

How are other cars able to vent when theres no load on the engine (>1psi) and I cant vent properly even when at 6k. If you pust a BOV with a 21lb spring on an EVo running 21psi how is he able to open the 21lb spring when revving in nuetral even though his car is only making 1psi of boost in netral. Vacuum must play a big role here that I'm not understanding

**1999impeza2.5RS** · 11-30-2006, 02:41 AM

im kinda glad you brought this back because ive been having the same problems with my FAT stage 3 kit. the BOV is a small blue turbo xs (dont know what type). how do you take the spring out?

Brydon · 11-30-2006, 03:12 AM

on a TXS just unscrew the whole top of it until it pops open...

**George of the Jungle** · 11-30-2006, 11:38 AM

Quote:

Originally Posted by ACraPPyRS

I'm sorry to have to do bring this thread back from the dead but there still something I'm not understanding.

How are other cars able to vent when theres no load on the engine (>1psi) and I cant vent properly even when at 6k. If you pust a BOV with a 21lb spring on an EVo running 21psi how is he able to open the 21lb spring when revving in nuetral even though his car is only making 1psi of boost in netral. Vacuum must play a big role here that I'm not understanding

just becuase you hear them vent doesn't mean it's a full vent. especially when it vents when revving in neutral. the turbo is not pushing anywhere near the same amount of boost as it does when the engine is under full load. so yes, a BOV can vent in neutral, but it's never going to be a full violent vent.

**1999impeza2.5RS** · 11-30-2006, 12:31 PM

Quote:

Originally Posted by Brydon

on a TXS just unscrew the whole top of it until it pops open...

i see the o ring on the top but its up to far to get a good hold on it to turn. is there and easier way to unscrew it?

VAUGHNB19 · 02-02-2007, 06:02 PM

I must again bring this back cuz im sick of hearing the flutter either from my turbo or the WG...why is it doing this still even with the hks bov? this was what we did, i had the icu plus black box that came with my eps kit and tial bov, no fluter but slow response when i press the gas, then put the NEO , i hear fluttering, esp from stop and go, but when im driving and press the gas alittle and let go quick response no fluttering(at higher rpms....

so eps sent me a new black box(ICU), took off the neo, no fluttering again but slow response and forgot about my horrible idling up and down when car is stoped(running rich)..

so i decided to buy the hks suer sequencial bov and put back the NEO take out the black box(icu) , flutters again...i really think it the WG and not turbo..but still needs to be fixed now

i really think the neo is doing something cuz without it dont flutter but there is a slow response with the icu or black box..????

11-27-2006, 08:15 PM	#41 (permalink)
George of the Jungle Tyler Slak Car: 98 L Wagon. Fav Mod: EJ25D My: Subaru Parts for sale Join Date: Aug 2002 Location: Columbia, SC Trader Rating: (46) Posts: 14,284	the BOV is set too high. it's not opening fully. the spring is too tight. the turbo is not forcing enough air into the BOV to make it open all the way. it's probably only gettin about half open and surging back into the turbo. you need an adjustable one, or turn the boost up so it has the pressure enough to open the BOV completely. __________________ Kasey Elizabeth George 4.20.04 - 8.14.06

11-27-2006, 08:28 PM	#42 (permalink)
George of the Jungle Tyler Slak Car: 98 L Wagon. Fav Mod: EJ25D My: Subaru Parts for sale Join Date: Aug 2002 Location: Columbia, SC Trader Rating: (46) Posts: 14,284	double post... __________________ Kasey Elizabeth George 4.20.04 - 8.14.06

11-30-2006, 03:12 AM	#47 (permalink)
Brydon 2.2L Turbo Car: 93 Teal L; 2001 Aspen RS Fav Mod: IHRTLAG -- License Plate My: Subaru Parts for sale Join Date: May 2006 Location: Vancouver, WA Trader Rating: (3) Posts: 3,728	on a TXS just unscrew the whole top of it until it pops open... __________________ I hope you don't actually believe the things you say. - Jurzeyfresh

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11-28-2006, 07:39 AM	#44 (permalink)
VAUGHNB19 2.5L Car: Impreza 2.5 Rsti :) 2004 My: Subaru Parts for sale Join Date: Nov 2006 Trader Rating: (1) Posts: 256	anyway i wnet to the shop...no bolt..it was actually a nut i thought was missing but it was all fine...so yeah im gona try getting new bov

11-30-2006, 02:41 AM	#46 (permalink)
1999impeza2.5RS Premium Member Car: 1999 Subaru Impreza 2.5 rs-t My: Subaru Parts for sale Join Date: Mar 2006 Location: central new york Trader Rating: (5) Posts: 889	im kinda glad you brought this back because ive been having the same problems with my FAT stage 3 kit. the BOV is a small blue turbo xs (dont know what type). how do you take the spring out?

02-02-2007, 06:02 PM	#50 (permalink)
VAUGHNB19 2.5L Car: Impreza 2.5 Rsti :) 2004 My: Subaru Parts for sale Join Date: Nov 2006 Trader Rating: (1) Posts: 256	I must again bring this back cuz im sick of hearing the flutter either from my turbo or the WG...why is it doing this still even with the hks bov? this was what we did, i had the icu plus black box that came with my eps kit and tial bov, no fluter but slow response when i press the gas, then put the NEO , i hear fluttering, esp from stop and go, but when im driving and press the gas alittle and let go quick response no fluttering(at higher rpms.... so eps sent me a new black box(ICU), took off the neo, no fluttering again but slow response and forgot about my horrible idling up and down when car is stoped(running rich).. so i decided to buy the hks suer sequencial bov and put back the NEO take out the black box(icu) , flutters again...i really think it the WG and not turbo..but still needs to be fixed now i really think the neo is doing something cuz without it dont flutter but there is a slow response with the icu or black box..????

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