Where to run my external wastegate from ?

[Dsmj89]

My engine bay around the exh mani/alternator area is kinda cluttered and i am unsure wether to run my external wastegate from the exh mani going with a hafe exh mani/tial wastegate combo or a 2.5" ss o2 housing/tial wastegate off the o2.
I do plan to heat wrap my dump tube but i want to know what you guys think will be a safer way to run the wastgate off of and away from my intercooler pipe as possible.
Thanks.

 

[Boosted98gsx]

O2 housing, with small form factor tial 38mm vband, and recirc it back into the o2 housing.

 

[Dsmj89]

Why recirc ? I'm looking to dump it for good. Thanks.

 

[Boosted98gsx]

No point in dumping on a 16g with a 3" exhaust. Now if we were talking a turbo that had a turbine that was 3" dia, it would be a different story. Safe yourself the earsore, recirc it, and save the tie down straps as well (for the dyno).

 

[turboglenn]

No point in dumping on a 16g with a 3" exhaust. Now if we were talking a turbo that had a turbine that was 3" dia, it would be a different story. Safe yourself the earsore, recirc it, and save the tie down straps as well (for the dyno).

Although i agree with your point of view and qwould suggest the same thing ( just running it recirculated) Simply due to how restrictive the turbin housing is on MHI turbos, I would also say that dumping it initially even if just for some testing might be worth while at least for getting more air out of the turbine housing/o2 area even if it goes back in the DP further down the tract.

I did a custom DP on an older mx3 running a tiny little VH10/VJ20 hybrid( IHI turbo ) to where i divided the turbine outlet from the WG area and added an external dump to it and it was definitely worth it. The car picked up a TON of power over the previous setup of having the turbine and WG dumping into the same 02 housing and then out the old DP. We haven't dyno'd the car yet, but the seat of the pants feel definitely showed improvement over the OEM recirced setup with the DP coming off the OEM o2 housing. And the 1/8th mile times have showed gains in trap speed and lower ET's. The setup did eliminate the OEM o2 housing (i had to custom cut the flange, there's pics in some of my threads on it) so i'm not sure how much of it is because of eliminating that o2 housing with a straight DP hooked up and how much o it is because the open dump but worth whil for sure... I talked to him just a few minutes ago and there's a video coming toniht with him toasting an LS-1 can on a 100shot (okay, i'm OT rambling, sory)


Now we haven't tried putting the wastegate back into the 3'' pipe after the O2 housing to see if anything would be lost there, but the improvements IMO were a direct result of having less pressure backed up in the hot-side of the turbo/o2 housing area.

 

[crimsondragon]

I'm currently dumping directly on my intercooler pipe. Well not exactly on it but to the side. It's still getting coated in soot though. I bought a 1.75 slip fit 45* bend tube from Pepboys to install but due to the ceramic coating, I need to bore the ID of the tube more to make it fit. Also it might be a bit long so I might cut it as well. That's your best bet but if you want trouble free, just stick with the internal gate unless you plan on running low boost.

 

[Boosted98gsx]

There is SO much expansion (and theoretically pressure drop) in exhaust gas from a TD05h turbine into a 3" exhaust, that recirculating the gate pointing down the exh stream might help direct flow and add velocity back into the ex gases.

 

[toofast82]

I run a FP O2 housing with 38mm gate open dump. I'm very happy with the setup and sounds nasty at WOT on the b16g! I only have a 2.5" downpipe, so I think the non-recirc setup is helping the flow out some. I personally will never go back to internal also!

 

[empie1]

16g + recirc 02 wg houssing ftw.

 

[turboglenn]

That's your best bet but if you want trouble free, just stick with the internal gate unless you plan on running low boost.

definitely a little safer to keep from burning up some things in the engine bay or soot covering stuff, but a little more pipe akes care of that, but the real reason i posted was because..and you may already know this, but an external gate gets quiter as you turn up the boost because it has to open less.

as the boost is turned down the gate has to stay open more thus being louder

Just another 3.5 cents from me

 

[big_d]

I wish I had a better picture of this, but mine is dumped right in front of the crossmember kind of near the overflow bottle. I'll see if I can snap a better picture tonight. Oh and that flapper is now welded .

 

[Dsmj89]

That's exactly the pic i wanted to see big d. I'll appreciate if you get a similar angle shot like i did to see your setup a little better. Is your dump tube close to the power steering lines ? Is it hitting them or did you eliminate them? I'll be waiting for the other pics.

 

[MidnightTSI]

Here are some pics of mine with the new PR O2 kit with the 38mm Tial MV-S.
This is the dumper setup as you can see.

It works great. I completely deleted the internal by removing the flapper and the arm. I then grinded the hinge down so it would fit nicely. Once it was grinded flush I jb welded what is left of the hinge back into the housing.

My power steering is completely deleted but this kit is so compact I don't think you would have any fitment issues.
I'm running 15 PSI on the slowboy G50 and the dumper is pretty loud but sounds great. I am waiting to turn the boost up until I get my logger working. Pretty solid boost control also. It creeps about a psi or two but nothing too bad. I'm sure once I turn my boost up a little the creep will go away. I also spool faster with the external. My internal gate was horrible btw. I would not recommend slowboy internal gates. But anyways on with the pictures!

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[big_d]

No, the car has all lines intact. I will get a better shot later tonight. The pipe clears everything, and the closest point is by the slimline fan which has about ~1" of clearance.

 

[Dsmj89]

Thanks midnight for those pics. I know yours is a 1g, but do you think judging from my pics that your setup would clear my intercooler pipe as shown in my first pic ? Thanks again guys for the help.

 

[MidnightTSI]

Thanks midnight for those pics. I know yours is a 1g, but do you think judging from my pics that your setup would clear my intercooler pipe as shown in my first pic ? Thanks again guys for the help.

You're welcome. I was also looking at your intercooler piping. The V-band clamps make it extremely easy to change the position of the dumper tube so that shouldn't be a problem. My VR-speed intercooler is on the way so I will probably have to adjust the wastegate positioning a little. I see you also have the VR-speed setup. It might be kind of tight but the bend in the PR dumper tube seems like it should clear it without any problems. I know I have a little bit of room to rotate the assembly back about another half an inch. It looks like you might have to adjust the intercooler piping a little bit too.

I will let you know once I get the new setup with the intercooler installed. I will post up some pics of how close the piping is to the dumper tube. I should have it installed sometime this upcoming weekend.

 

[Hubbard 0]

If you move things around, you'll be surprised with what you can get to fit.

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[Dsmj89]

Thanks midnight and hubbard.
With my vr-speed fmic piping and j-pipe, it's hard to make space as you can see the j-pipe is curved to a certain extent where i can move the coupler only so much before i run out of coupler to make a nice clamp and seal for my intercooler pipe. I even took out my lower heat shield to see if i had some more space back there but nothing.
I think i have made up my mind and i will be running my wastegate off the exh mani like big d in his pic, and just fab up a custom dump with a few bends to make it way out around the ps line area on the bottom of the car .
Thanks again guys for all the help.

 

[MidnightTSI]

Thanks midnight and hubbard.
With my vr-speed fmic piping and j-pipe, it's hard to make space as you can see the j-pipe is curved to a certain extent where i can move the coupler only so much before i run out of coupler to make a nice clamp and seal for my intercooler pipe. I even took out my lower heat shield to see if i had some more space back there but nothing.
I think i have made up my mind and i will be running my wastegate off the exh mani like big d in his pic, and just fab up a custom dump with a few bends to make it way out around the ps line area on the bottom of the car .
Thanks again guys for all the help.

Sounds good, glad we could help

 

[Hubbard 0]

Sounds good, glad we could help

Yep, glad to help.

 

[big_d]

One more.

 

[Dsmj89]

Thanks big d i think that's pretty much how i'm gonna run my external, just like yours out there as far as possible.
By the way what fan is that ?

 

[Aaron91RS]

hope these links work.
Anyway these are some older pics. From the external there is a pipe that goes down to blow exhaust out under the car but it wasn't hooked up in these pics.

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[big_d]

It's just a Hayden 10" fan. I use the a/c in the summer, so I thought a replacement was needed.

 

[Dsmj89]

Alright thanks guys.