I've looked around and couldn't find any info about this being done before. I'm in a situation where I can't get the turbo I want with an O2 Mounted WG. Nobody has them, I've looked everywhere. They do have one setup for the WG to be on the Manifold. Trouble is, I want to recirculate it back into the exhaust. Normally, this wouldn't be a prob, I'd just go into the DP. A shop here wants $150 to do that. So I figured since I'm buying a 2.5" O2 housing anyway, I figured I'd save a little money and instead of getting it recirculated into the DP, get an O2 housing fabbed up to let me recirc into it.

What do you guys think? Can you see any drawback to doing this? Any unforseen problems I might run into?

Shane2GSX said:

I've looked around and couldn't find any info about this being done before. I'm in a situation where I can't get the turbo I want with an O2 Mounted WG. Nobody has them, I've looked everywhere. They do have one setup for the WG to be on the Manifold. Trouble is, I want to recirculate it back into the exhaust. Normally, this wouldn't be a prob, I'd just go into the DP. A shop here wants $150 to do that. So I figured since I'm buying a 2.5" O2 housing anyway, I figured I'd save a little money and instead of getting it recirculated into the DP, get an O2 housing fabbed up to let me recirc into it.

What do you guys think? Can you see any drawback to doing this? Any unforseen problems I might run into?

Click to expand...

I would have to see a photo or two of how exactly your WG is positioned, but recirculating directly into the O2 housing (with the WG mounted on the exhaust manifold) is something I probably wouldn't do nor advise. From the exit of the external WG to the reintroduction of those passed gases into the exhaust system one typically wants to have an 18-24 inch section of piping. Any shorter than this and you could compromise the flow of the exiting gases from the turbine housing.

You want a smooth transition.

You just don't want to dump the WG gases as quickly as possible into the main exhaust system with tubing 90 degrees in relation to the main exhaust system. You want to follow the contours of the main exhaust system for as long as possible (in the length I gave you above). This is to prevent unwanted turbulence and unnecessary backpressure immediately following the turbine housing.

On the other hand, you may wish to move the first O2 sensor down into the DP to sucessfully pass emissions, and this may call for a tad more effort on your part that you may not be willing to put in.

Explain to me why then people use an O2 Mounted WG that recircs back into the O2?? What's the difference? I'm just coming back into the O2, except from a WG on the EM. If interupting exhaust flow was so important, why would they do this?? Many people have O2 mounted WG's that recirculate and they work great.

You can get an external gate mounted on the exhaust manifold, take it to an exhaust shop and get a custom pipe to the downpipe or...

Get ready to blow $1000...




http://www.dnperformance.com/manifold.html

Or.. I have a shop about to do it for about 285 (O2 that lets me dump back into it from a WG mounted on the EM). And that's not 285 extra, since I was spending that on an O2 housing anyway. So actually, I'm out $0.

My question was will this cause problems with boost control/performance?? That's ALL I want to know.

Shane2GSX said:

Or.. I have a shop about to do it for about 285 (O2 that lets me dump back into it from a WG mounted on the EM). And that's not 285 extra, since I was spending that on an O2 housing anyway. So actually, I'm out $0.

My question was will this cause problems with boost control/performance?? That's ALL I want to know.

Click to expand...

Sounds good...

I don't think it will affect performance unless the entry angle into the o2 housing is very big. Try to keep it less than a 45 degree angle, if you can.

Now that's the advice I was hoping to get. Thanks!! I'll make sure to tell them that.

See any probs w/boost control?

Shane2GSX said:

Now that's the advice I was hoping to get. Thanks!! I'll make sure to tell them that.

See any probs w/boost control?

Click to expand...

No, I don't see why it would affect boost control, make sure you have a good boost controller or use the right springs on your external gate to get the boost you want. Your setup will, in the end, look similar to the DNP kit above, except it won't be tubular.

Thanks for the help Dee.

This is exactly what I'm talking about...
http://www.dsmtuners.com/forums/showpost.php?p=1747894&postcount=24

Shane2GSX said:

This is exactly what I'm talking about...
http://www.dsmtuners.com/forums/showpost.php?p=1747894&postcount=24

Click to expand...

That looks perfect for your setup and what you are trying to do. I'd print that out and tell the exhaust shop you want that, if I were you.

Definitly.

Now, I'm getting some advice from a few people on here and on DSMLink forums that I shouldn't have a WG on the #1 Runner, as SBR's is. Then I here it's okay and works well. Plus, I've seen many people with it.

Is it okay to do this?

It's "ok" to do this, but it's not the most effiecent set up.

Shane2GSX said:

Definitly.

Now, I'm getting some advice from a few people on here and on DSMLink forums that I shouldn't have a WG on the #1 Runner, as SBR's is. Then I here it's okay and works well. Plus, I've seen many people with it.

Is it okay to do this?

Click to expand...

Originally Posted by Robert@FP in their new FP Manifold thread...

"Sorry, no single runner wastegate flanges on our manifold. People still do that?

What happens if you need to WG more than 25% of the flow out of the motor to hold motor down to a certain boost? Does that mean that some of the flow from the 3 other runners has to travel backwards down the #1 runner in order to get out of the WG? That is rhetorical of course, do not attempt to answer, we all know how poor of a solution that truly is.

This manifold is designed to support the FP30 turbos, and they all have integral WG ports made into the turbine housing so that WG flow can be drawn equally from all runners. Of course most turbos are made this way with internal gates, and any of those will work rather well with this manifold.

well, back to the lab."

It is okay to do it, sure. It's not the most efficient setup as stated below, but the T3 manifold has a gate on the no. 1 runner and SBRs manifold has a gate on the no. 1 runner and many other members have welded flanges on the no. 1 runner, so it works.

Well, I really don't wanna wait till June. I'll have to think about this one.. Thanks for all the good info guys.

I called up Punishment racing, and they said they could take my stock 2G manifold, port it and mount the WG on the collector. Then recirculate it just like the link I gave in post #10.

I think that should work and will probably end up saving me a little money.

Shane2GSX said:

I called up Punishment racing, and they said they could take my stock 2G manifold, port it and mount the WG on the collector. Then recirculate it just like the link I gave in post #10.

I think that should work and will probably end up saving me a little money.

Click to expand...

Shane, are you going to have a pipe extension coming of the collector, or are you having them make a flange right off the collector? Another thread has started about this topic, and you can see what I'm talking about here.

Doing this instead:
He's taking a housing that he had in stock (slightly used, and used for only 2 weeks) and sending it to PTE to get the hole for the WG (on the O2) bored out and ported.

I wanted to do this too and it just seems a ton easier to dump it into the DP, good pics btw

-gold