Will this work for a downpipe?

[b00st_catalyst]

Ok, i am cheap, I can weld and i have access to a water-jet cnc.

That being said, any reason why i can't have my buddy cut me a flange to match the mitsu and just weld my own downpipe and dump and eliminate the o2 housing.

I didn't see any reason why it wouldn't work, just thought i would double check.

TIA

 

[tkelly27]

That's called a tubular O2 housing. In the DIY tech section they have a how-to on making a jig out of the stock O2 housing. When you make it, make sure to properly isolate the rest of the exhaust from the down pipe with a flex section. If you don't you're running a high risk of cracking/breaking something.

 

[c4uldr0n]

There is no reason why you couldn't do what you are saying. I'll give you extra credit if you do, because I like doing homemade stuff myself. An o2 elim would be pretty nice in fact, but make sure you leave enough room to get at your bolts to assemble/disassemble it.

-c4

 

[bobster22388]

This sounds like something interesting to try, i might look into it

 

[rc000e]

Yes, as previously stated that would be fine. I just wanted to add, that when you select placement for your O2 sensor, you want it oriented facing down. This is so that condensation doesn't collect on the O2 when the car is static, which will cause the O2 to eventually fail.

 

[b00st_catalyst]

I am going to sit down and do a template of the o2 housing gasket tonight in CAD. I should get it to him by the weekend and have a flange cut first part of the week.

I am surprised no one else has done this.

I have the 3" flex already, Thanks for the advice, i learned that the hard way awhile back.

 

[b00st_catalyst]

There is no reason why you couldn't do what you are saying. I'll give you extra credit if you do, because I like doing homemade stuff myself. An o2 elim would be pretty nice in fact, but make sure you leave enough room to get at your bolts to assemble/disassemble it.

-c4

I am going to try studs, i won't know really until i start playing in CAD tonight.

 

[TunaTalon]

Be sure to make smooth transitions from the bypass port to the downpipe. See http://www.hahnracecraft.com/hahn/parts/eiwg.htm for the HRC version.

Also as tkelly27 mentioned use a flex section to isolate engine vibrations from the cat.

 

[tkelly27]

I am going to sit down and do a template of the o2 housing gasket tonight in CAD. I should get it to him by the weekend and have a flange cut first part of the week.

I am surprised no one else has done this.

I have the 3" flex already, Thanks for the advice, i learned that the hard way awhile back.

It's not like nobody has ever done this.

This guy sells them
http://www.punishment-racing.com/biography.html

This guy explains how to do it
http://www.angelfire.com/mech/earz_93/o2_housing_jig.html

You can buy a flange here
http://store.racing-solutions.org/td7cmmioufl.html
if you are feeling lazy with the auto cad. You can buy a flange for the down pipe (a true 3" one if you want) and an O2 bung there too.

Something else you might want to consider, the factory used a cast iron O2 housing for a reason. I'd assume it's because it's a high stress area, but don't quote me on that. If you want to build it for longevity, consider some thick wall bends. I have a spare 3" schd-40 weld-el I was going to use when I make mine, should I ever get around to it. If I don't use schd-40 I'll be sure to support the piece with an exhaust hanger of some type.

 

[b00st_catalyst]

I was being facetious, Thanks. I am also not making a tubular o2 housing, i am making a downpipe from the turbo to the cat. thus eliminating the 02 housing.

 

[tkelly27]

Are you talking turbo to flex section in one piece? At that point if you want to remove your down pipe you've got to take it off the turbo. PITA vs. welding up a flange if you ask me.

 

[b00st_catalyst]

Are you talking turbo to flex section in one piece? At that point if you want to remove your down pipe you've got to take it off the turbo. PITA vs. welding up a flange if you ask me.

It would be turbo to cat. with a flex section, Yes. This is the first turbo car i have owned that used an o2 housing, i think its a PITA.

As far as removal, it wouldn't be any more of a PITA than having to remove both the o2 housing and the downpipe. It would be easier actually...IMO. I understand the "stress" of that area, this isn't the first time i have fab'd a down pipe.

Also..why would i buy those parts, when i can have one made for free.

Any other thoughts.