DIY | BOV/BPV Delete - Block Off Plate | Stage 3 WRX Turbo Sound

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This mod can literally be done for free assuming you have the tools & metal lying around.

No BOV/BPV? No problem! Well, Hopefully anyways lol! I fabbed up some block off plates & wedged them between my BPV flanges to force the positive air pressure in the intercooler piping to go back out the turbo. This is what's causing the fluttering noise. Now there's a lot of debate whether or not this hurts the turbo. There's plenty of 80s & 90s vehicles that came without BOVs from factory, turbo diesels that don't have them & even race cars. So I guess time will tell whether or not this ends up hurting my turbo. Do your research & form your own opinion before doing this mod. Anyways, All I do know is "Pssss - TSUtsutsutsuuu"

Video with iPhone 6
Thumbnail made in Photoshop CS5
Video Edited in Sony Vegas Pro 12.0

Current Mod list below
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=Interior=
Aluminum Dead Pedal
OEM STi Shift Knob
'06 Blue STi Carpet
'04 Blue STi Door Panels (front and rear)
'04 STi Center Console
JPM Coachworks Shift Boot
Gutted Trunk
Passenger seat is a 2004 JDM V8 STi Seat
Driver seat is a 2003 JDM V7 STi Seat
Rear Seats are 2003 JDM V7 STi Seats

=Exterior=
'04 - '05 Duraflex Fiberglass STi Replica Front Bumper
eBay STi Front Lip Replica
JDM STi Spec C HID Headligths
'06 STi Wing & Trunk (top plasti dipped black)
Emblem/Pillar delete for front grill
Front grill WRX emblem
eBay Bumper Quick Release Fasteners
'04 - '05 Duraflex GT Concepts FiberglassFront Fenders
'04 STi Hood Scoop
Big JDM Fog Lights & Bezels with multi-color Housing / Lens
JDM Tail light mod

=Engine=
Dyno Results - 289whp / 274tq @ 19 psi on 93 Octane
IHI VF39 Turbo
Thermal Solutions Turbo Blanket
Blouch Oil Feed Line
TiAL 38mm External Wastegate (EWG) w/ 14.5 psi (1 bar) spring
Cobb Interal Wastegate (IWG) Bracket for EWG setup
Cobb 3-port Electronic Boost Controller (EBCS)
Cobb EBCS 1/4 Inch EWG Fitting & Hose Kit
Cobb Short Air SF Intake
TurboXS Front Mount Intercooler (FMIC) w/ Stock BPV
Injector Dynamics Fuel Injectors 1000cc (Top Feed)
Injector Dynamics Fuel Injector PnP Adapters USCAR to Denso
NGK Iridium Spark Plugs One Step Colder 2667
Walbro 255 LPH Fuel Pump
eBay Post MAF Rubber Hose
Godspeed Silicone turbo Inlet Hose
Grimmspeed Catless Up pipe w/ Flex Section, 38mm Wastegate Flange & Dump Tube
eBay 3" Bellmouth Catless Down Pipe
Tsudo 3" N1 Catback Exhaust
eBay 3" Electric Exhaust Cut Out
Mishimoto Aluminum Coolant Reservoir
Mishimoto Heat Tape for the IC pipes
Cobb AP V3 on Custom Map by Clark Turner Tuning
Windshield Washer Reservoir Relocated to trunk
Stock BPV w/ Block off plate (BOV / BPV Delete)

=Drivetrain=
JDM V7 STi 6 Speed Transmission ( TY856WB3AA )
Stage 2 STi Clutch kit
Automatic Driveshaft
05 WRX Male Axles ( LH = Sedan & RH = Wagon *shorter* )
R160 Rear Diff w/ 3.90 gears
Front & Rear Shifter Bushings
Kartboy Transmission Crossmember Bushings
Torque Solutions Shifter Pivot Bushings
Torque Solutions Pitch Stop Mount

=Handling=
STi BBS Forged Wheels 17x8 +53 offset 5x114.3 (Silver)
SAILUN ATREZZO 225/45 17s
eBay 25mm (1 inch) 5x100 to 5x114.3 adapters / spacers
eBay EMUSA Ride Height & Camber Adjustable Coilovers
eBay Rear Upper Strut Tower Brace

[compfreakpro]

Been a engine builder for 25years, I myself have been turbocharging cars since the early 90’s, since then turbochargers have come a long way, to my knowledge this isn’t causing any type of harm to the turbine or throttle body. There’s a lot of comments here saying lots of different things but these days everyone’s a mechanic lol

[sebastianb]

How tf is it ricer lmao it’s literally one of the best sounds in the entire world lol

[GD_Ryuusan]

This type of compressor surge is harmless. It only does considerable damage when it happens under throttle. It can cause your impeller to wear out faster, especially if ceramic, but not enough to warrant reliability issues.

[jayhow]

It's not as bad for your turbo as people think. When ejits say it stalls the turbo it doesn't mean that turbo stops spinning or spins backwards, it's not the turbo that stalls it's the air just like interference over a planes wing stalls the air. It may lose you 4-5% of turbo life which out of 100, 000 miles isn't enough to worry about. Lack of regular oil changes is alot worse for turbo.

[snar]

Small compressor surge will probably shave a few thousand miles off the turbos life, but when it’s this small, it probably will shave literally only a few thousand miles off this turbos life. Absolutely worth it imo.

[squishypitbull]

From a person more knowledgeable than me for all the "experts" commenting that you need a BOV. Hope this will break it down much better than I put it before.

"Not even turbo manufacturers themselves manage to get this one right - talking nonsense about compressors stopping and spinning backwards.I'd like to add a couple of very important points about compressor surge:Compressor surge is caused by two very distinct situations. And the situations have two very distinct outcomes: One cause you could call "lift-off" or "closed-throttle" surge. Caused by closing the throttle plate, eg. between gearshifts. The other type of compressor surge is "open-throttle" surge. This is happens when the throttle is open and the turbine is being powered by the exhaust gasses. It is cause by a turbocharger that flows more compressed air than the engine can digest.
Open-throttle surge will DEFINITELY destroy a turbo (I can confirm because I've done it!). However, a BOV will NOT stop this; on open-throttle surge the throttle is open and the inlet manifold is pressurised, therefore the BOV remains closed. The only way to stop this is either to choose a more suitably sized turbo, or to tune your boost control so the turbo produces less boost at the point where it surges.Lift-off surge, on the other hand, is much less damaging - possibly to the point of being negligible. Exhaust flow is low so there is very little force acting on the turbine.I've built and also tuned a fair number of turbocharged engines of various outputs over the years. I've also rebuilt a number of turbochargers. I've never once experienced one die from not having a bov. Oil starvation, oil contamination, foreign object damage, over-speeding (quite often when a BOV hose, Tee'd to the wastegate hose, splits) yes - lots. But not having a BOV? Never.Personally, I feel that the negatives of running a BOV (expense, added complexity, more potential points of failure) outweigh the possible positives. So I never run BOV on any of my engines - and never will. [Sorry about the big block of text. for some reason Youtube keeps deleting my paragraph spacing]"

[bbuildingmarch]

wow i just realised after watching ur video again, you found a better way to do it!!! you don't need to take out the entire valve or block of the return hose and vacuum line. just add a full plate. intelligent. i've never seen any other video on youtube do this.

[squishypitbull]

To kill any argument about doing this.
This is not bad for a turbo. Cars had turbo's long before BOV's were a thing and they ran just fine without blow off valves.
For those stating its ok at low boost but not at high levels its also crap. Rally cars and others like porsche's all had turbos' without BOV's and they ran just fine. Its called flutter.
Compressor surge is a completely different thing and that WILL harm the turbo.
Blocking off or deleting your BOV does NOT cause compressor surge. End of argument.

[zayedaqab]

Is that safe for the engine and the turbo?
And what future effects will it be?

[zachr]

You could also get this by using a blow off valve that you can adjust how much pressure it opens up at and just tightening it down

[patricktaylor]

Isn't the point of a bov to mitigate rpm loss in the turbo during shifts so that it is spooling up from an rpm range that is above boost threshold?

[BagpipekilR]

BOVs aren't solely made to keep the compressed air from damaging the turbo but to keep it from damaging the throttle body blade when boost is reached and the butterfly is slammed shut in the throttle body. You can bend the throttle body shaft or the plate at higher boost levels. Possibly even sending pieces into the intake manifold. Your probably fine at low boost tho. Just some info no hate, does sound cool tho... lol

[georgiaharper]

I can't get enough of this sound it's beautiful ❤️

[delbert]

Hey man im loving that soundWhat kinda intake piping u used for the turbo suction?What are the widths and lengths

[kbrownfocus]

Nice vid man, now I will say this and I know it's already been stated in some of the sub replys to others, but here's the thing to the ones unknown, if your 400hp+ cars that are set up tuned, diesels that are stock, and set up and tuned, oh and don't forget about 80% of all WRC and Rally Cross, and GT Cup cars, that are all turbo, why don't they have a bpv, or bov.... It's simple.... They can only do so much, and when you're running high horse high rpm and most cases high tourq, then a bpv, and bov are going to be a waste of time and mony. Yes they do up the size of the wastegate, and somtimes a twin scroll, but other than that, that's it. I used to be a Toyota Tech. and I've seen my fair share of Supra, and older celicas, even the mr2 running nothing but a solid inlet tube. Hell 90% of all cars built before 93 that were turbo had no bpv or bov, just a smaller wastegate. The bpv was added to make the turbo set up quiet, since excess boost is diverted into the intake manifold, and the bov which mostly became mainstream in '97 to pretty much now is 90% atmospheric. If you do this on a stock car, turbo obviously, like the Cruze 1.4, Feista ST, Focus ST, and the WRX then you more that likely won't hear it, unless you have higher boost levels, or you have an ECU tune, or added a bigger wastegate, which with todays turbos you will mostly need a tune for that. But, and this isn't bs, its a fact, some turbos that have the turbo vein vectoring set up like the gas/petrol engines need the bpv in order to work properly. The only thing your going to hurt doing this "mod/delete" is your fuel efficiency and thats it, oh thats the conspiracy with the bpv, noise and fuel economy. Hell if this was forbidden then wonder why its a norm on most of all tuned turbos across the Plus to add, diesel dont and have never had any bov or Deisel tech for Ride next to most stock diesels out there and you will faintly hear turbo vein flutter, tvf, or tf.

[JKLIFE]

On my 04 wrx top mount intercooler which side will this be on? New to wrxs and this looks like a fun cheap mod.

[TehSakred]

How safe is this? What are the draw backs?
I'm have a 100% stock 04 STI. I plan on putting on a cold air intake and a catback (maybe cat less) exhaust. Do I need any extra mods? And does this benefit the car at all performance wise

[mninjas]

Can you still get that sound from the stock turbo, i see you got a turbo upgrade

[thelachsmith]

You will probably see damage to boost pipes, intercoolers, etc before you see premature turbo failure but thats more likely at much much higher boost pressures than what you're running

[londongoddamnit]

Geez can we all at least use the right acronym [BPV]. I'd like to see how blocking off the bypass valve affects the AFRs.