GT-R`s all come with dump valves as standard,the recircluating type!!!!!!!!!!!!!!
There are many after market atmospheric race dump valves available,maybe this is what you wanted to know?These make the big whooooossssh noise but can lead to engine stall on hard braking & are really made for big BHP Skylines.
So to fully answer your question,WE all have dump valves mate.
I have the HKS sequential dump valves, and as stated, they do make your engine prone to stalling. The way around this is to fit HKS EIDS's, but they only make it slightly better. On hard breaking if you dip the clutch at all then the revs will start to drop. Cosmetic practical
I have the GREDDY TRUST SPEC-R single dump valve fiited.
It is a recircularitory (crap spelling)one and have no
problems at all, in fact it has improved throttle response
and all you hear is a small amount of woosh through the
Blitz air filters.
Unless your car has been specifically mapped and/or needs a dump to atmos dumpvalve, then you run the risk of ruining your fueling/mixture.
You would, however, increase the chance of a flameout greatly
any thing with a
turbo charger has a dump valve it controls the amount of exast to the turbo the mor you put your foot down the mor the wast gate closes
super chargers dont have em
corect me if i am wrong
Small point but Skylines have dump valves and wastegates.
A surge of pressure is created when you close the throttle while your engine is on boost, it is the job of the dump valves ( located under the drivers headlamp) to release this pressure. Dump valves are kind to the turbo's when the throttle is shut, as they would otherwise be pumping air in to a closed chamber. Not all turbo cars have them - e.g. Escort / Sierra Cosworth.
The standard turbos have internal wastegates which relieve exhaust gas pressure when the required boost has been achieved. All turbo systems have either internal or external wastegates.