BOV = Bad time on these cars... just don't do it. You can get a Psshhhh sound with an intake but that will require a tune.

 

wont a tune screw with the car too?

 

You'll need a tune for pretty much every engine related modification with the exception of axle backs/catback exhaust.
A BOV on these cars that are designed to use a BPV can cause a lot of headaches and issues. It's a lot to go through just for some sound and nothing else.

 

The Bwahh Stutututu sound is actually compressor surge meaning the BPV/BOV didn't vent quick enough or long enough so some of the pressurized air hit the throttle body, when it slammed shut, and went backwards. Back into the outlet of the turbo which usually isn't good for journal bearing turbo's (Most Subaru OEM turbo's are journal bearing).

A BOV on a Subaru is not a good idea. If you want to here the blow off noise of a BPV, the safest way is to get a well know aftermarket intake and get tuned for it. The car will feel a lot better with a "Stage 1" tune plus an intake anyway. Find a reputable tuner first and ask them what brands of intake they like best. If they like a brand better, that means it is easier to tune for and therefore safer for the car.

If you really want that compressor surge sound, go pickup an old tuner car (240sx, Supra, R32 GT-R/GTS-T, something with a 1jz/2jz motor, SR series motor or RB series motor, etc.), put a big diesel turbo on it, delete the BOV/BPV, tune it and have fun. :thumbup:

-Ty-

 

That's compressor surge and you don't want that. When the throttle body slams shut the compresed air starts pushing against it and back through the turbo. Bad news.

Imagine sitting on the toilet and the toilet saying, nope too much and shooting everything right back up the old chute. It's basically like that.

Avoid the bov there isn't any tangible advantage for you to put one on your car. the air is already metered and if you vent it out of the system via a bov then you are missing it from the system and the cat will run rich for s period of time post throttle closing. The factory bypass valve is more than enough, and functions as intended.

If you want more of that intake sound buy an aftermarket intake.

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Trade it for a Supra.

 

Trade it for a 9 MR2 Turbos.

*FIXED

 

Now ... be nice ...

 

Well the safest way to make that noise would probably be to say it out loud yourself every time you shift, as opposed to causing compressor surge, as others have mentioned.

I suppose an external wastegate would at least make the "BWWWWAAAAAHHHHH" noise, but the only external wastegate system I know of for the 2015 WRX is the ETS turbo system, and that's a total turbo system replacement (obviously requires extensive custom tuning): ETS 2015-2016 Subaru WRX Turbo Kit

It's definitely not street legal either, so.... there's that.

 

Mighty Car Mods put a BOV on a non-turbo car using an air compressor.

 

It works on bicycles too!

https://www.youtube.com/watch?v=Z_fG_b65WiU

 

They also got the speaker on the Honda and wired it under the throttle pedal so when they lifted it went psssshhhhhh. It was hilarious. The one guy looks so irritated by the sound it's hilarious.

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add a perrin intake. it doesnt require a tune and it'll make that noise

Cold Air Intake System for 2015-17 WRX

 

Yes it does.

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Set your car on fire, it'll make a crackling noise.

 

How do i make the "bwahh stutu" sound on 2015+ wrx

Yes. It's wrong though. The data seem convincing. Can't link via mobile; pls search.

 

It's marketing lingo.

Let someone correct me if I'm wrong, but changing the intake changes the air flow and without adjusting the tables for thr air flow the maf sensor is sending faulty data to the ecu

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I'm open to challenges to the following logic:

An intake that increases the volume of air entering the engine would also increase the volume of dirt entering the engine if it incorporates a "free flowing" filter. This can be readily assayed with a used oil analysis to look for Si and/or increased wear metals in the engine. I see no benefit to this (I'm being lenient; it's actually terrible).

An intake that does not affect air flow would not require re-mapping the car. However, an intake that does not affect air flow arguably does not affect output, or in fact anything else except perhaps noise and the now-familiar dirt levels entering the engine.

An intake that does affect air flow would require re-mapping the car. However, if the car is going to be re-mapped, I suspect there are dyno data to support simply using the authentic Subaru intake +/- other modifications downstream to increase output. Although this may/may not equal the output available from a "tuned" intake +/- other mods, at least there's less cost and less dirt.

Damned if you do, damned if you don't. Intakes are a bit depressing actually. Can't we just all forget about them?

 

I'm open to challenges to the following logic:
An intake that does not affect air flow would not require re-mapping the car. However, an intake that does not affect air flow arguably does not affect output, or in fact anything else except perhaps noise and the now-familiar dirt levels entering the engine.

Technically the MAF is taking a reading of air flow over an area, specifically the area of the sensor wire. This is going to be a constant unless you use an aftermarket MAF sensor. What changes is how that is scaled up to the area of the whole intake, at the point where the MAF is located (think 2D plane). If the new intake has the same dimensions at the MAF location and is similar in terms of pipe roughness, the MAF scaling should not need to be tuned.

The biggest issue here is that every car, stock or extremely modified, can benefit from a custom tune simply because of manufacturing tolerances and the need for OEMs to create Maps that are safe for every vehicle on the assembly line

 

I would agree in general. However most paper filters are capable of flow far exceeding the needed capacity, so an appropriate sized filter for the air flow should leave equal results. So a giant filter is going to be able to have slower flow through because there is a way larger surface area and in theory could be a denser material.

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Add this. It will even look like you have a dual turbo setup. Plus much cheaper.

You're welcome.

https://www.amazon.com/Turbo-Electronic-Simulator-Switch-Chevrolet/dp/B00QF84ZJ8

 

A very easy way to get this very satisfying stututu blow off is simply cutting a piece of metal plate the same shape as your bpv flange, and then put that on the bpv as a blockoff plate so the air shoots back into the turbo instead of through the bov, and the blades will cut against it make the chopping noise. Everyone is going to tell you it’ll ruin your car. Just do some real research and you’ll see you’ll be fine. (Rough explanation I apologize if there are some weird spots and confusion)

 

I did some real research. The hammering of the air demolishes the bearing. In a race car that has to last hours before a new one is swapped in fine. On a daily driven car its stupid