Wastegate Poll

[Big J]

external dump if u want max power, recirculate if want less noise.

most will see a bigger than 2hp increase. it does sound shatty on small, lower power motors.

You're not going to see a real benifit, other than a small amount of hp if your exhaust is effecient to begin with, (more than 2 whp, but not a whole lot). Untill you get to the point you are really pushing the flow limits of your exhaust system there isn't much benifit. If you lose effenctiy, in the form of increased back pressure, around 500whp on a 3" exhaust you'll see a lot more gains going open dump then if you're nowhere near outflowing your exhaust and you dump, you'll mainly just get noise.

On a 1000whp Supra w/ a 3.5" or 4" exhaust, an open dump is goin to make way more difference than on a 300whp 1.8L **insert car make here** w/ a 3" exhaust. You'll have more than enough flow left in your exhaust to handle what the WG dumps back in. If you running a 2.25" or 2.5" and 300ish WHP, an open dump will make more diffrence than with a 3" exhaust.

There's more to it than preference, unless you're dead set on feeling the need to anounce to the whole world you're in boost.

[blackshine007]

You're not going to see a real benifit, other than a small amount of hp if your exhaust is effecient to begin with, (more than 2 whp, but not a whole lot). Untill you get to the point you are really pushing the flow limits of your exhaust system there isn't much benifit. If you lose effenctiy, in the form of increased back pressure, around 500whp on a 3" exhaust you'll see a lot more gains going open dump then if you're nowhere near outflowing your exhaust and you dump, you'll mainly just get noise.

On a 1000whp Supra w/ a 3.5" or 4" exhaust, an open dump is goin to make way more difference than on a 300whp 1.8L **insert car make here** w/ a 3" exhaust. You'll have more than enough flow left in your exhaust to handle what the WG dumps back in. If you running a 2.25" or 2.5" and 300ish WHP, an open dump will make more diffrence than with a 3" exhaust.

There's more to it than preference, unless you're dead set on feeling the need to anounce to the whole world you're in boost.

It's the ricer in them that makes them want to hear the noise

I definately agree with you. There's really gonna be mimimal gains with and external vs. an internal. I personally would recirculate it. Whooptie doo that you have boost, why annoy the whole world with it? Just like I would recirculate the BOV as well. Either way with a cone filter, it's gonna be heard.

[nextelbuddy]

route the WG dump back into teh down pipe or exhaust.

i left it open on ym first turbo build on the m3 and it sounded like ****. and way too loud.

if you route it back into the exhaust at a direct 90 degree angle you will cause turbulance in the exhaust flow.

always route your dump pipe back into the exhaust at a angle so tha the dumped exhaust merges into teh exhaust flow smoother and also teh exhaust acts as a vacuum helping to pull the exhaust fromthe dump pipe as well.

[Big J]

always route your dump pipe back into the exhaust at a angle so tha the dumped exhaust merges into teh exhaust flow smoother and also teh exhaust acts as a vacuum helping to pull the exhaust fromthe dump pipe as well.

ding ding ding, we have a winner. You can actually use the recirc to increase velocity in the air mass of either the dump tube or the main exhaust depending on which has the higher velocity at any given time and the angles you use. That's part of the reason my exhaust starts at 2.5" goes up to 3" and then I run a 2.5" muffler. By the time the exhaust has reached the 2.5" muffler it has lost a good bit of heat, and because of that volume, so the restriction acts to speed up the air mass, help retain velocity, and create an area of lower pressure at the end of the exhaust via the venturi effect, or I'm completly full of ****.

nothing about this downpipe cost me power. It's idealy recirculated 16 or so inches away from the turbine outlet and is merged smoothly back into the main pipe just before the next pipe. Once I step the next pipe up to 3" it should work even better.




Open dump is somtimes, to some people, just turbo car rice.

[Benefit]

route the WG dump back into teh down pipe or exhaust.

i left it open on ym first turbo build on the m3 and it sounded like ****. and way too loud.

if you route it back into the exhaust at a direct 90 degree angle you will cause turbulance in the exhaust flow.

always route your dump pipe back into the exhaust at a angle so tha the dumped exhaust merges into teh exhaust flow smoother and also teh exhaust acts as a vacuum helping to pull the exhaust fromthe dump pipe as well.

x2 , it sounds like ass...

why are people saying leave it open?

[superboost]

It's the ricer in them that makes them want to hear the noise

I definately agree with you. There's really gonna be mimimal gains with and external vs. an internal. I personally would recirculate it. Whooptie doo that you have boost, why annoy the whole world with it? Just like I would recirculate the BOV as well. Either way with a cone filter, it's gonna be heard.

This coming from the man who encourages me to ride up next to people and dump to see the looks on their faces.


If you want to run it external, just be advised of the additional noise it creates. If you want to run internal, then plumb it internally. Also, you should figure out what you want to do with your car. If you are driving it daily, or frequently, I'd recommend plumbing it back in. it is only fun when you hear it about the first 10,000 times. If you plan on driving the car only on weekends, leave that beyotch open.

That being said, I prefer open, but that is my preference.