Discover

The first clip with the blue gtr-
I'm in love with this fluttering sound lol and wondering if or how can this be done on an Impreza WRX?
Ps: is that the engine, turbo or BOV that makes that sound?

scoobyboy1

iTrader: (16)

NO dump/re-circ valve gives you that sound, If your running the standard WRX intercooler, remove the standard re-circ and put a blanking plate over it and block all the pipes upto it!!! I have tried this in the past and the car will run like crap unless you have it mapped to suit and go mafless!!


Same goes if you have a Front mount intercooler just dont run a re-circ/dump valve and you get something like this below!

Cockney Wideboy

iTrader: (2)

Forgive me if I have total miss understood this as I am no expert or mechanic.

But isn't that chattering sound caused by the turbo basically trying to stall due to the back pressure caused by the shut throttle. And therefore the air and pressure in the turbo is surging?

If this is case then why would you want to do that? As surely it offers no performance gains and will stress the turbo.

Apologies if I have this totally wrong, happy to be educated :-)

Discover

I have no idea but personally I like the sound and if it doesn't impact performance I think I'm gonna look into it.
I've heard cars do that just when you shift/release throttle that's what gave me the impression it was BOV related.

jayallen

iTrader: (31)

Fill your boots... http://www.ebay.co.uk/itm/Exhaust-Pi...MAAOSwKtlWjqDF

Discover

Hey C'mon man lol

powerwrx

iTrader: (11)

ive also wondered about that noise too, hear it a lot on sprint/track cars and I do like the sound of it

johnlogie

iTrader: (4)

No DV, FMIC.

bustaMOVEs

iTrader: (31)

I too have a simlar sound, no dv with fmic

johnlogie

iTrader: (4)

domino46

That's my mates scoob on the bbscoobys stand , he was running a sc46 on it at the time , lovely scoob that one

The Pink Ninja

iTrader: (23)

Mine does the same with topmount running mafless with custom turbo inlet and RCM induction kit

crazyspeedfreakz

iTrader: (92)

[QUOTE=The Pink Ninja;11809309]Mine does the same with topmount running mafless with custom turbo inlet and RCM induction kit

Are you using a dv or blanking plate, I had that chatter also but took of my dv to go back to recirc and lost the chatter

Discover

That sounds a bit different though.
So to solve this, is the above info correct that I need to remove the dumpvalve and fill in blanking plates to intercooler? Would that not cause overheating/issues in the long run?
Also what's FMIC stand for?

bustaMOVEs

iTrader: (31)

Mine sounds like that because I'm going rapidly through gears, but I have the chatter on lift off.
Just blank DV and that's it, it sounds better if you've got a fmic (front mount intercooler)

RS_Matt

I have adjustable spring tension on my DV so my car chatters, vents or does both simultaneously depending on revs.

bustaMOVEs

iTrader: (31)

The only thing that chatters, is you.

The Pink Ninja

iTrader: (23)

Still got the standard dv fitted but the inlet is a custom one piece with no take offs so I know it's not recirculating, I think the dv is blanked off underneath on the recirc take off, still need to remove the OEM air intake for a better one

Discover

Mines a standard 06 WRX (top mounted inter cooler)
Everything is standard apart from K&N panel filter, Ninja back box with straight through centre pipe. The original recirc valve was replaced by a crappy eBay dump valve by previous owner.
Could I just remove the dump valve and get some blanking plates for the intercooler and I'm good to go?

Marco.Singh

I wouldn't recommend doing that as blanking it causes the air to be pushed back from intercooler hitting the turbo blades causing the 'chatter', chopping air sound by turbo blades or otherwise know as a 'flutter'. This obviously causes stress or wear on the turbo. Td turbos are better known to take that additional stress compared to vf turbo. Blanking will shorten the life of any turbo.

I would stick to the OEM recirculating valve

bustaMOVEs

iTrader: (31)

You pay to play, never known a turbo to fail this way, obviously it will strain turbo but will take a long time to fail, depending on wear of turbo currently.

Discover

Ahhh still mixed views

Beastie

iTrader: (2)

I have posted on the GTR forum asking how to get that "Scooby" sound with my GTR

Marco.Singh

At the end of the day its your car so the choice is yours.

As you mentioned the car is fairly standard with a cheap dv on it. This is of course my opinion but I would stick on a oem recirc valve and you may be pleasantly surprised that the car runs a lot smoother. I've tried different dump valves for the sound (ssqv and dual port 50-50) and I have on both occasions gone back to the oem valve as the car is a lot happier with it and runs spot on compared to when it had a dv. I would rather the car running 100% than the sound factor.

If you want the flutter sound then by all means block the dv but I'm pretty sure that will come at the expense of the car running crap.

Again just my opinion buddy

Cockney Wideboy

iTrader: (2)

I can totally agree with this, my Impreza came with a Blitz VTA DV fitted, everything else was totally standard* (STi Type UK with PPP).

The car was a pig to drive, fitted the OEM recirc back on as one of the first things i did to it and the car was a totally different car. Very smooth, much better power delivery and seemed faster, its certainly didn't lose as much engine speed on gear changes and the turbo seemed a lot less laggy.

night and day and i've never looked back.

RS_Matt

Will a mapper adjust a map for a BOV or Blanked DV?

sy.

iTrader: (8)

There is a sort of 50/50 on this if a plate with a smaller hole is fitted behind the ome recirc valve with say a 12/14mm hole then you can get a part pressure release of the unused air via the recirc and also a part turbo stall or chatter or that sound whatever.