FLUTTER sound as BOV

[2BNVS]

when i got my cooler fitted with my pod, my stock bov was fluttering, now i have the GFB Hybrid bov and its great, no problems with stalling due to part atmo/part plumback, just as loud as supersonic bov, and it flutters when i make about 3psi max then its just like normal over that so it shouldnt cause much damage on the turbo...

ben...

[Col-GTSX]

Anything under 6psi will not harm your turbo....

A HR31 does not even have a BOV as standard (i used to own a couple)

If you plan on running 7+ psi then use the above info...

[Skyrine-Dave]

Anything under  6psi will not harm your turbo....

A HR31 does not even have a BOV as standard (i used to own a couple)

If you plan on running 7+ psi then use the above info...

Col... HR31 and VLt's didnt have BOVs... but then again they are 80's technoology cars and these days almost all turbo cars have factory fitted bovs

[(B1) MR_fanny]

i guess thats why most of the tricked up old school vl's flutter like crazy.....not my cuppa tea though.

[HYBRID VL]

i have a VL calais with a HKS SSQV Front mount Rush O2 pod and running 6 psi on a RB20 T03 on a RB25/30DET and my flutter is hella loud

[THE_REAL_SLYR33]

that noise you all want is damaging your turbo i know it sounds good i have it myself and yes by blocking off the blow of valve you will get this noise thats how i get it also using a pod filter the noise is caused when the throttle body is shut the air in the pipes has nowhere else to go but back normally out the blow off valve but since its been blocked it can only go out through the front housing of the turbo wich causes the turbo to try turning back the other way producing alot of stress on the shaft it bounces back and forth of between the throttle body and front housing till all the air has escapped so NOT GOOD but sounds great i have yet to blow up a turbo but mine is aftermarket just thought you might like to know a few things i own my own shop and often mod cars and people ask for this sound and i wont do it for obvious reasons WHEN IT BLOWS UP I PAY

[FATAZZ]

i dont need a BOV coz i dont get off the Gas(Auto)

[kpgc10]

most of the drifters here in okinawa have this sound....its called backpressure. my car has it, what i did was take the hr31 piping and put this where the blowoff piping was, then hooked up my boost gauge to the vacuum line and plugged the bigger hose with a bottle cap. it wont damage your turbine if you have the stock turbine and intercooler...it should be fine

[Nik Black]

BAD BAD BAD. Don't do it. I blew a turbo from not having a BOV fitted running only 11psi. Get a steel shaft turbo if you want that noise.

The turbo is flowing a LOT of air under boost and as soon as you release throttle the throttbe body closes while the turbo is still spinning causing it to reach very high boost levels between the turbo and throttle body.

If you want to see for yourself how bad it is just hook your boost gauge up before the throttle body and watch the needle go off the scale when you take your foot off the gas.

[RyanN]

when i got my cooler fitted with my pod, my stock bov was fluttering, now i have the GFB Hybrid bov and its great, no problems with stalling due to part atmo/part plumback, just as loud as supersonic bov, and it flutters when i make about 3psi max then its just like normal over that so it shouldnt cause much damage on the turbo...

ben...

<{POST_SNAPBACK}>

Nengun sell a HKS product that prevents atmosphere style BOV from stalling the car. However i had no problems with a GFB mach 1 atmospheric type on my r34.

http://www.nengun.com/catalogue/product/578

Edited August 18, 2005 by RyanN

[Guest ErazeR]

delet please

Edited August 19, 2005 by ErazeR

[Rolls]

It is not proven that not running a bov will harm the turbo at all even at high PSI.

It can even cause the car the be less responsive as you have to repressurize all the tubing when you get back on the throttle. (More noticeble with a frontmount)

[Suspct_32]

The fluttering effect that ppl get is compressor surge which is the air building up when the butterfly flap is closed (not accellerating) and pushing back to the turbo bouncing the returning air off the fins.

I wouldnt recommend it as if you are running a ceramic turbo this stuter effect that is being forced on the turbo can break off the ceramic blades, which will result in one screwed up turbo.... Sounds cool, but messes sum turbos up bad..

[R33ing]

A HKS mushie pod.......flutters hell loud.....sounds like a full on BOV wen da car is driven hard...

[funkymonkey]

gheyest thread ever. omg fullsick hektik I get to make a flutter noise.

Backpressure is harmful especially if you're running non standard boost levels. However, its all fun and games on stock systems. Hell my 57 year old dad's Cefiro came with factory flutter because they have no BOV in stock form so the backpressure makes the RB20DET turbo "flutter".

In any case, how in the hell did this become a DIY thread. Moved.

[RANDY]

lol! How indeed! I guess it does tell you how to do it... blocking off your BOV.

Sounds like we need a new section for "decreasing performance". It can contain large chrome wheels, blocking off BOV's, and buying Chinese eBay manifolds! =-p

[koleka]

The one better sound then the flutter is when you connect the Air filter on a long pipe and have the Airflow metre on the intercooler. Gives the VL style dose.

sounds nice.

[Driver]

gheyest thread ever. omg fullsick hektik I get to make a flutter noise.

<{POST_SNAPBACK}>

haaaaaaaaaaaaaaaahaha

good

i was just looking at this thread to write the same thing

[TTT]

I guess the people with knowledge on this decided that telling the same thing over and over and over and over and over and possibly much more over again, is too much and don't bother when new posts liek this come up.

here is a VERY good explanation of it all.

sure it's on NS.com but the author is a very knowledgeable person..

http://www.nissansilvia.com/forums/index.p...=28060&hl=stock

read it and then shut the hell up about flutter and what your theory on it all is.

if a mod wants to make that link above a sticky about fluttering, then that would be good.

then if the mods would BAN FOR LIFE any person that mentions flutter again, that will also be good

[psybic]

I guess the people with knowledge on this decided that telling the same thing over and over and over and over and over and possibly much more over again, is too much and don't bother when new posts liek this come up.

here is a VERY good explanation of it all.

sure it's on NS.com but the author is a very knowledgeable person..

http://www.nissansilvia.com/forums/index.p...=28060&hl=stock

read it and then shut the hell up about flutter and what your theory on it all is.

if a mod wants to make that link above a sticky about fluttering, then that would be good.

then if the mods would BAN FOR LIFE any person that mentions flutter again, that will also be good

<{POST_SNAPBACK}>

F#CKEN AYE!!! I don't even bother explaining it anymore when people ask about why my car makes certain noises. Just pat them on the head and say "Just keep doing your thing guy"