Location of external wastegate.

[Merlin Beerens]

hey guys, I need to know the differences of mounting the wastegate on the manifold or the o2 housing. I heard its better to mount it on the o2 housing, that way you are venting all 4 cyl, instead of just #1 runner, or does it not matter at all?

What do you guys think?

thanks

 

[L2RTSiAWD]

O2 housing vent is the way I would personally do it.

Later,

 

[xleRateGSX]

Is that made by victory performance?

The idea of mounting the WG on you O2 is logical. My experience here is lacking though...

 

[Merlin Beerens]

no actually its made by DSMotorsports

http://www.diamondstarmotorsport.com/turboparts.htm

c'mon guys need more feedback, thanks

 

[L2RTSiAWD]

What turbo are you going to run?

Later,

 

[IPT]

I have been told by more than one source to vent it at the O2 housing. It is the easiest way to to vent from all 4 runners. The other choice would be to vent from the collector area of your manifold. (usually how the full garrett ones are)

 

[swordfish]

"Mounting the wastegate._ this is one of the most overlooked areas of boost control._ In a perfect world you would select a mounting location for our wastegate that allows the gate equal access to all cylinders or rotors._ This promotes equal exhaust port pressures between cylinders/rotors and avoids mysterious tuning problems resulting from uneven exhaust port back pressures._ Another aspect to keep in mind is the high velocity of the exhaust gas inside the exhaust manifold, sometimes exceeding 800ft sec._ Gas that is traveling at such high velocities will not easily make 90 degree turns of zero radius into the wastegate inlet._ Remember Newton's second law, "bodies in motion tend to stay on motion"._ That particle of air is not particularly inclined to make a 90 degree turn and 800ft/sec._ It must be persuaded to do so by giving it a gentle radius and easy access to the exhaust flow._ Simply welding the gate to the side of a tube may work in some cases where the manifold back pressure is thru the roof, but in modern high efficiency turbochargers the pressure inside the manifold can be quite low and special through should go into wastegate runner geometry._ The penalty for poor gate placement and poor gate runner design is having to use a larger gate."

Straight from Tial. I also use an 02 mounted gate. HKS 40mm and I run a very very large Garrett.. well sorta.

jeff

jeff

 

[Merlin Beerens]

Originally posted by MuttedTSiAWD
What turbo are you going to run?

Later,

I would like to run a green, but probably will run a ported and clipped big 16g


thanks for the info swordfish

 

[L2RTSiAWD]

Well you don't need a ext gate for a tubro that small but if you really want one. Like Swordfish said get 02 mounted.

Later,

 

[Merlin Beerens]

so the way that wastegate is set up in the picture, that would be nice and loud too huh?

 

[L2RTSiAWD]

It is very loud dumped to the atmosphere.

Later,

 

[RocketDSM]

What would running the dump tube back into the exhaust path (around the turbine of course) do for performance?

 

[L2RTSiAWD]

They same as dumping to the atmosphere but w/o all the noise.

Later,

 

[RocketDSM]

Also, is that an O2 bung I see in the pic?

 

[L2RTSiAWD]

Ya all replacement O2 housing have a bung becasue you still have to have your O2 sensor.

Later,

 

[RocketDSM]

I just assumed that someone running an external wastegate would have used an O2 eliminator. I found it relieving to find that it still has an O2 bung. I might actually be able to make this pass smog (with it recirced of course). NO more boost spikes, YEAH!

 

[L2RTSiAWD]

Even O2 eliminators have the Bung. I have an O2 eliminator DP and it has the bung. it has to be there to retain the O2 sensor in the stock location or else your car wouls run like #@%#@%#@%#@%.

Later,

 

[Mistaspakles]

If you dump to the atmosphere, the sound isn't that bad. It is very distinctive though. I was told that venting to the atmosphere is better than back into the exhaust (performance wise that is).

 

[NDgsx]

Extranal dump sounds better the more boost you run also. At pansy boost, 16 and under, it sounds like crap. 20psi sounds great.
I have a custom 2.5" o2 housing and HKS 40mm wg.

 

[Enigma_Man]

I've heard that dumping the wastegate to atmosphere right in your engine bay leads to getting the whole inside of your engine bay messy/black.