Need help for stock bpv/bov. Done something and want to know if it is safe

[Alexai]

Hi guys. Don't know too much about my new ms3 gen1 yet so Im gonna speak in very basic terms.

The stock bypass valve on the gen 1 has 2 pipes coming out of it. One thin 1 at the front (I think that's vacuum)?? and a fatter one at the back (the 1 that goes back to the turbo)??

Anyway, a mate showed me that if I disconnect the fat rubber pipe at the back of the bpv, and seal it up so it is air tight, it gives off a very loud whoosh (vrrrrchhhhhh) like a blowoff valve.

It sounds amazing, but I wanted to know if by doing this, will it damage anything at all? Or is there any reason I shouldn't have it disconnected?

Any feedback would be greatly appreciated
Thanks!!!

[Jrbris]

it will backfire alot and i would say get an aftermaket bov and a sri and still have the noise safley.

[Alexai]

it will backfire alot and i would say get an aftermaket bov and a sri and still have the noise safley.

Yes, I had ordered a turbosmart 50/50 BOV but I couldn't justify paying $400 for it now after I heard the sound from disconnecting the rubber pipe.

However, when I am in first gear changing to second it jitters a bit once I take my foot off the accelerator (not nesecerily high revs, just driving around in the street). I'm wondering if that will go away once the ecu learns about the disconnected pipe?

And yes, still looking into a Sri

[Jrbris]

personaly i wounldn't run it like that.

[Nuliaj]

No the ecu will never learn about the VTA unless it's retuned by someone. You're also running slightly lean anytime you reduce throttle.

+1 on just buying a hot air intake.

[Alexai]

No the ecu will never learn about the VTA unless it's retuned by someone. You're also running slightly lean anytime you reduce throttle.

+1 on just buying a hot air intake.

Yes I'm looking for a hot air intake (cai)
but I just want to know if it will damage anything? After all, isn't it just air??

[Toddy22587]

After all, isn't it just air??

yes its just air. Air that has been measured on entering the system to calculate the proper/safe Air to fuel ratio. So if you let this air escape without the ECU knowing about it it will cause the engine to get a bad mixture with isn't good.

CAI or SRI with stock BOV will give plenty of sound

[Oldhead]

Dont let mates who KNOW nothing about these engines play with them . As Toddy stated above . Also as stated the ECU will NOT learn that a plumb back pipe is closed off DUH.

[rayd]

Dont let mates who KNOW nothing about these engines play with them . As Toddy stated above . Also as stated the ECU will NOT learn that a plumb back pipe is closed off DUH.

Good point ... But I'm just wondering why you chose the word "know" to capitalize ? Surly the keyword is "nothing"

Also if you run the BPV with the recirculating valve closed off you will get compression surge and may damage your turbo

[Alexai]

Thnk you all for your input, I have returned everything back to stock and the car is running a lot better, I guess just time to start looking for a Sri