Is Flutter good?

[Redback]

ok..... after hearing my boss's VL turbo fluter the other night i couldn't help my self.... so i pulled the vacume tube off the bov and there is was nice loud flutter. pluged up the vacume tube with a bold and it was done.

now what i want to ask is does this effect my performance. it feels as if my acceleration is pretty crappy through 1st and second compared to what it used to be.... but that just might be me trying to find problems.

[mupkant]

hah

last night my mate said we should unplug the hose that goes into the factory bov and block it off so we get the 'flutter noise', well it did give the flutter noise. but this morning when i drove my car and i realise the difference, it is slower. 1st and 2nd gear takes longer to hit the high rev marks and also the pull has dropped.

i was wondering this myself this morning, thought it may have just been myself ;

[DJ984]

Hybrid BOV and had it set to flutter under about 3000 rpm.. all seems good...

The guy from GFB said flutter isn't as bad as people say it is and you can tell that from cars that where around woth turbos when they didn't come with BOVs...

He said an average turbo's life expectancy is 100,000km's and you won't effect that really...

[nitemare5]

I've got some mixed reports about this trick. 2 of my mates that have done it said they've actually gained some response, while me and another mate have actually lost some response when doing this mod. I guess whatever works and what you're happy with

[memphis]

its called compressor surge, its from the pressure running back through the turbo, as the bov is not functioning.

This slows the compressor wheel down, and thus your turbo has to work that little bit harder when you shift.

it can effect the lifespan of your turbo, but nothing drastic. but BOV's are there for a reason, so it would be best to keep it connected.

[JNR24]

Ball Bearing turbos dont like compressor surge at all, as there is less contact area between the shaft and the Core of the turbo, compared to a bushed turbo (T03s-T04s) that has 100% contact at all times.

A mate of mine is a die-hard VLT fan, and loves the High-pitch sqeelch of compressor surge "AKA Cooler noise" that echos for a couple of blocks.

He also loves GT series turbos (GT40s) witch happen to be ball bearing turbos. He has learnt this lesson the expensive way by, having to replace 2 GT40 Cores (And still counting) and spending over $2400 on new cores. Due to the turbo failing under excisive compressor surge. (@30PSI+)

Obviously you cant argue the fact that Nissan has spent millions of dollars on R&D and thought that a B.O.V would be benificial.

And they are!

They increase spool times, decrease's (Yes, even cars with BOVs fitted will still surge slightly) compressor surge, and some people that have them ATMO Vented like the PSHH sound.

Bottem line:

You cant improve on factory (Nissan put a BOV there because there reasearch & dev team thought that it would benifit the motors: reliabilty, performance or durability) . Use logic, anything over 15PSI i would be making sure i had a BOV.

my 2c

[Redback]

thanks but ive decided to reconnect it. you can fix the power loss by blocking the bov vacume up i think.

no i can feel the G's. hell yeah!!

[paulr33]

Its funny when u see a VLT put a bit of acceleration at the lights and not move and make a loud flutter noise.

Then you look at the guy and think to yourself, go the comperssor surge!!!!

Love the damage is probablty doing to the blades and the compressor wheel

[Squizz]

Coming from a Car with no bov (my cefiro) and fitting a R32 factory BOV atmo venting at the moment, I can tell you that anyone who says bovs are not a performance mod can bite my ass.

I can change gears now and have the boost where I left it not wait half an hour for the bloody turbo to spool again.

The flutter was ok, but I prefer my psscht.

[QuickR33Melb]

If you want the BOV noise why not fit a big aftermarket BOV??

I have a super sonic turbo smart model. You can hear it 100 metres away.

One problem I have had though is the car stalling after a massive release of compression

[Squizz]

1. I am paying for my Blitz one tomorrow.

2. The R32 was free off my old 32 spare engine

[TTT]

I am not going to put my opinion on if flutter is bad or not..

But I will tell you how to fix the slow spool up.

I am guessing that what you did was simply take the vacuum hose on the top of the bov off and block off both sides..

this is not enough.

you need to take the bov off the pipe (2 bolts) and completely block off that hole under it so that NO air goes to the bov at all.

then you will have your flutter and FAST spool up when accelerating.

[WLD747]

Well i have a Blitz DD BOV- The fluter sound is only produced between 1 - 3 rpm and over 3rpm is the pssh sound. I reckon the flutter sound is damn good. HEHEHE!

[SeD]

Im new to this but isnt there an amount of damage dealt to a intercooler this way aswhell??? or is this something else... soz for the newbiness but im just clueless