No Dump valve

[Tinhead]

I’ve just converted my ST to BT do I need to run a dump valve as don’t want to spoil the look with that thing sticking out!!

[Dan Le Moignan]

Probably should
I ran without one for a while with no issues but not sure how it effects turbo life span

[PaulRSCos]

Isn't there a recirculating one as standard? If you run no dump valve (recirculating or atmospheric) you will get that fluttering sound instead which I think is air retarding the turbo and, as Dan says, that will put undue stress on it which may affect lifespan.

[Dan Le Moignan]

It sounds great but causes compressor stall!

[twin turbo]

I never use any dump, quicker and much more raw sound

[mark shead]

Much better without it.

Mark