What would be better as far as performance wise,having the exhaust dump on a wastegate running back into the exhaust or just into the atmosphere? Or does it even matter?

Bare with me im new to the turbo game.

 

Atmosphere, you could get some turbulence in the exhaust if you port it back in.

Either way would work, but venting the exhaust to the atmoshpere would be the prime choice

 

so long as it vents outside of the engine bay as to prevent egr.

 

external or internal gate?

 

External of course.

 

why of course?
<----internal gated atmo dump

 

As long as it goes under the oil pan, or out the car, it's fine.

If you can run it as far back as possible and connect it in, do so.

 

Stick with the 15" rule of thumb and then plumb it back in. Unless you have a really optimized setup, you're not going to gain anything by going to an atmo dump, state inspection problems aside. You're also not going to have any turbulence problems unless you have an undersized exhaust. This is where the 15" rule of thumb comes in, that's about the point where you're far enough away from the turbo to not have the turbo and wastegate affect each other. Basically, if there is a difference between atmo vs plumbed, you have problems with your downstream exhaust system and need to address that first. When someone can show me back to back dyno tests of a properly done street turbo setup with a properly plumbed in wastegate dump vs. a atmo dump on the same setup, and the difference is actually noticeable, then I'll change my tune. I have yet to be convinced though. I'm with Jarrod, if you can plumb it back in, do it.

 

I would love to plumb it back in. It sounds like shit. My steering column Is very much in the way and makes plumbing extremely difficult.

 

mark w. has his coming out in front of his driver tire on his integra