External Wastegate o2 housing portwork

[LiquidX]

As the title states, I need info on using an external wastegate off of the o2 housing. I'll be recieven a BEP housing for a HX40 that is set up for the external gate. I have read that you need to open up the wastegate outlet. Haven't found much more information than that.

How much material am I supposed to remove from the wastegate passage? Everything in there or just a little around the inlet hole? If you have pictures, that would help out GREATLY.

Thanks

 

[squeak104]

When I got my housing for the HX-40 from Justin it was also already set-up to run external off the O2. As far as I know it was never ported at all. Nothing down the housing or the hole where the flapper used to be and I have gotten mine to run as low as 7 lbs of boost. This is with the Ebay knockoff Tial 38 MM.

 

[LiquidX]

Hmmm, maybe I should contact Justin then if I can't get anyone elses opinion or pictures.

Did he mention anything about needing to work the wastegate outlet?

 

[squeak104]

He didn't say anything about it, but I also didn't ask. I might also mention that my O2 housing started life as a standard Ebay stainless housing then was cut and made to fit the knockoff wastegate. So its not exactly set up to flow as well as some of the nicer ones from vendors. Dsmonster has pretty much the same set-up that I do using Ebay parts and also has no problems keeping the boost low. It seems as though the only people that are having problems controlling boost on Holsets are those running internal gates.

 

[LiquidX]

I think you might be misunderstanding what I'm asking. Forget about the o2 housing all together. My question deals with the turbine housing.

Do I need to open up this hole at all on the BEP HX40 to run an external gate on the o2 housing? This picture is from a 16g for reference purposes only. Not my housing.

The housing I have will not have the flapper at all. How much do I hog out that hole if I need to at all? Here is another picture for reference of the wastegate passage.

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[squeak104]

I know what you're talking about, but the flow after the flapper is as important as whats before it. So what I'm kinda getting at with my thoughts on those is that dsmonster nor I have name brand parts that are made to flow well, but are still making the original casting of the housing work well. Just measure the hole against the size of your wastegate. If its smaller than make it bigger. From the experience I have you shouldn't need to, but it probably won't hurt. Just make sure there is enough meat to take off if you decide to port the entrance as well as the hole.

 

[LiquidX]

Hopefully I won't need to at all. I'll see if anyone else chimes in and when I do get around to sending out my snail to Justin, I'll talk with him about it at that time. Assuming he doesn't read this and chime in as well.

Thanks for the info Squeak

 

[THE_ARTIST_]

Just port it out to the size of the wastegate hole. No since in going bigger unless its for future mods. (38-40mm should be good assuming your using a 38mm gate.)

 

[LiquidX]

So as long as the outlet hole matches the size of the external wastegate it'll be fine? No need to hog out the whole area and turn it into a giant hole basically?

 

[99gst_racer]

Scott, you very well may not need to port the BEP housing at all to adequately control boost. But, you wouldn't want to get it all on the car and have creep/spike issues, so it might be best to do a little port work just in case.

I recently installed an FP 18G on my roommate's car. He's using a Tial 38mm mounted off of the O2 housing. We ended up porting the turbine housing just to be on the safe side. We hogged the hole out a little bit (no need to go to town on it's diameter), but most of the porting attention was on the path leading up to the hole. It's the same concept of porting for better internal wastegate control. Give it a path of lesser resistance leading up to the WG hole and that will help immensely with boost control.

 

[LiquidX]

Paul,

So basically It would be good to remove the round seal that would normally utilize the flapper? As well as doing a similar port job to the inlet like you would for an E316G to solve for boost creep assuming it has a hump or indirect flow to the wastegate?

Is there any harm for having a much larger hole in the exhaust path, say cause excessive turbulance?

 

[ishnish]

I thought when you port for boost creep with use of an external wastegate off of an o2, you just have to port out the wastegate flapper hole and remove the flapper.