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steves180

By steves180,
in Australian Capital Territory

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MKDR33 Mentor

MKDR33

Posted
Posted (edited)

hks super sequentials, they flutter/wooosh/whistle and all the rest, depending on how u release the throttle..

with mine, when i spool up the turbo and build up heaps of pressure in the intake pipes and release the throttle quickly it makes a woooosh sound, if i release it slowly it makes the fluttering sounds..

Edited by MKDR33
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race_snooze Grand Master

race_snooze

Posted
Posted

there is a massive thread covering this in forced induction (i think its in there) all about the sound BOV make. There is also a web site ffs that lets you here them. Agreed with hks super sequentials

If your putting it on a stock skyline DONT your car will more then likely stall when come to a stop, also cause other issues that are covered in lots of threads.

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Bullet32 Veteran

Bullet32

Posted
Posted

Thats gold! LOL

I dont think that you need to worry about finding a BOV that "flutters" because just about all BOV's are very similar in design...

The noise that you want is made according to how your intake system is set up ie:

*whether you have front mount intercooler or not,

*whether your BOV is plumb back or straight to atmosphere,

*whether you have a pod filter or airbox,

*whether your boost is turned up or not...

There are many different things to factor in when playing around with the inlet... And as said in previous posts, you might have alot of trouble with your mixtures (air/fuel) if you put the wrong BOV on without doing anything else to the car first (like a programable ECU or Air fuel controller)...

BOV's basically just make different noises according to how tight the spring in them is set to.

Happy hunting though :)

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MKDR33 Mentor

MKDR33

Posted
Posted

hmmm.. if this was the case, wouldnt the car stall? as the turbine will be forced to stop spinning and the exhaust will be returned back in the engine/trapped in the exhaust manifold, causing the engine to stall?

ive revved my car from the throttle body, looking at my bov as it releases air, and when it flutteres, i noticed the spring on my bov bouncing open/shut..

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Amaru Veteran

Amaru

Posted
Posted

The flutter is caused by the air thats in the inlet tract coming back out the airfilter when the throttle body is closed (when you jump off the throttle). Its called thrust reversion and another commonly associated word is thrust reversion damage (a turbo spinning at 100,000+rpm and suddenly has air forcing its way back through it the wrong way).

Its easy as pie to make your car flutter... remove your stock BOV and make sure you have a pod filter. With aftermarket bovs they reason they flutter is the bov is either not venting at all or only partially venting and the rest of the air is going back out the intake.

On a stock ECU it can cause all kinds of problems as the air thats expected to go into the engine doesnt make it in but the fuel does causing it to partially flood itself etc.

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satanic Grand Master

satanic

Posted
Posted

Simplest way to get some flutterin'

1) Put on a pod filter (if you haven't already got one)

2) Remove your standard BOV and make a plate up to block it off

3) Crank up the boost to say 10PSI

4) With a bit of practice, you should be able to hold flutters for up to 5seconds!!!

Happy flutterin'

DISCLAIMER:

1) Your car may/will stall as the air will be forced back through the turbo and back where it came from; your AFM will go insane hence causing a sudden "drop" in RPM and stalling. Even does it on an auto!

2) Your turbo may/will die - If I spun you 10,000rpm one direction, then hit you in the opposite direction with a baseball bat, you'd die too :D

Stan

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race_snooze Grand Master

race_snooze

Posted
Posted

my does it non stop, for those of you that have been in my car (polishstorm, Nick, andrew anyone else) i have the apexi duel chamber and a pod. Mind you the turbo is being replaced as we speak (by me lol) anyone want to buy a gcg highflow for 1700 so i can buy a gt30 or gt35.

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