Does this have one? I'm kinda know what it does but don't know how much it improves performance. I heard this is the thing that makes the cool sound between changing gears. Does this happen all the time or only when the turbo is being used a lot?
If the Coupe doesn't have one as standard then how hard is it to fit one and what kinda price am I looking at (buying the part and having it fitted). Cheers
I imagine it has one mounted on the turbo.
Dump valves have a pipe to the inlet manifold. When the throttle is closed (you come off the gas) a vacuum forms in the inlet manifold, and so the pressure on that side of the spring goes down and the valve opens and dumps the boost.
On a standard dump valve, or aftermarket recirculating dv, the boost travels along a different pipe and goes back before the turbo (and AMM) and is recycled.
On a 'Blow off valve' the air is dumped to atmosphere instead of recycled, and you get that whoosh you are on about.
However, a dump/blow off valve that dumps the air to atmosphere isnt as good for performance as you loose some air which would keep the turbo spinning for when you go back on the gas, so the spool up time of the turbo will be increased at the expense of the cool noise.
Its your choice, have a cool noise, or have a little more response from the turbo.
Hope that helps!
Nice one. Thanks for that. Don't suppose anyone knows which type the Turbo Coupe comes with? Or if you know what Vauxhall normally have on their Turbo range then it'll probably be the same, right? Thanks again