I have a Tial WG with the dumptube routed to the bottom of the car. When I blip the throttle, it makes a quick "BRAP BRAP BRAP" sound. I was told that it is simply dumping the excess. WHen I hit vtec though the BRAP becomes constant, and sooooo freakin loud it's crazy.

I was also told that it is becuase my WG spring is only .3 bar. So .. if I got a stiffer spring, would it go away? I also hear that routing the Dumptube back INTO the downpipe would get rid of the noise.

ARe these assumptions true?

 

hmmm......it shouldnt do that when you just blip the throttle. Are you talking about in neutral? I dont think you can build enough boost to open the WG by blipping it.

I am sure many people have suggested it, but make sure the metal ring is in.

Yes routing the dump to the DP will make it a lot quieter, but you will lose some power.

 

um don't replace the spring.......you'll go boom. That controls how much boost you run. if you get to big of a spring you will be running more boost and depending on your setup that might not be good.

 

check my thread about adding an MBC to help keep it shut more , i think we have the same problem, its too loud under vacuum, nevermind boost, dont mind it loud under boost but wish it would stay shut under vacuum, peep that thread

 

ahhh..... tial wastegate open loop dumping. It's a beautiful thing isen't it? I love mine and wouldn't closed-loop it ever hehe :D

 

in neutral u can't build anyboost

 

I can.

 

He is must be talking about big turbos I have a t3/t4e and I can't build anywhere near boost all the way up to redline in my ls

to big turbos...

If you can BOV in neutral, your turbo isen't big enuogh hehe :D

 

Yeah, the metal ring is on, I dont really know what it is that makes the sound.. I just want to know if it is bad or anything. I got it checked at payn Tech, and they said that is was fine, and that when they stuck their hand on the end of my dump tube, and somebody revved it, that they felt air rush out of the dumptube.

I guess it's okay since poeple are saying that I should expect it.

So long as nothing goes boom!