Dump/ Recirc/ Blow Off (Confused)

[ChrisValentine]

So, I want something to make my 98 Subaru turbo make this sort of sound
https://www.youtube.com/watch?v=WqACDuwR9w0

https://www.youtube.com/watch?v=QBUIsYa_E5M <--- More like this one. Is that just with a Forge Valve and filter?

OR do you have any videos of yours that sound better?

I've just got a Cosworth Panel Filter and Scorpion centre and Backbox. Would I need to get it mapped when I put the Forge Valve (or any valve on)?

Does it badly affect petrol usage?

 

Any negative affects on the engine or turbo? (read up and found quite a bit of scaremongering... )


Thanks in Advance,
Chris

[jay14]

I like the sound in the first video, I think that might be something to do with the wastegate, I'm curious to know now as well

[Scoobyghost]

Sounds more like turbo chatter than the effects of a dump valve.

From my limited knowledge turbo chatter is caused by the air escaping back through the turbo instead of the dv effectively stalling the turbo. I may be wrong so please correct me as such.

[ChrisValentine]

Blanking plates?
I can only assume it's bad for the engine? Are dump valves bad for the engine?

[stants]

Very bad for turbo life !

[ChrisValentine]

Sorry Stants, is that blow off/ dump valves that are bad for turbo life, or blanking plates?

[stants]

Blanking plates mate, forcing the turbo to stall puts loads of undue stress on it,

[Gambit]

Can get external waste gates to make noise or dump valves. Id say they had anti lag or something running possible with a blanking plate. To increase noise.

[stants]

Screamer pipe if you really want to **** your neighbours off