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Thanks that would be great to see some pics to get some ideas.
dsddcd, that DP looks like an external wastegate DP. I still have an internal WG. I'm thinking I may have to have the DP pipe flare out where it connects to the flange. Check out the pic below, something like that.
That DP will not work, it just a reg external WG Dp, mine is built like the greddy one just much bigger 3" and instead of going in at a 90 it kinda blends into to improve flow.
The one I posted is actually a silvia sr20 internally wastegated DP. The sr20 has a similar flange to the greddy turbo. I'm pretty sure something similar will work.
I had a rx7 turbo internal WG & my aftermarket DP was also similar. You don't need 2 seperate pipes it just helps keep down turbulence when the WG dumps. But the greddy being undivided I don't see how it's very functional to have 2 seperate pipes unless you insert a divider on the flange helping to direct the gases to the correct pipes.
Ive got my car in to make the downpipe like the pic that Edomund posted. Bellmouth 3" . Ill have the car back tomorrow and will let you know how it goes. Wont be going on a dyno for another week but will let you guys know I how do when the time comes.
s2kadl, post pics of your custom downpipe, sounds interesting.
Good link of the Cobb site - that's a typical Subaru exhaust. I learned what I know about turbos from working on my Subaru STI
the ATP v-band flange dsddcd posted above looks like a great option you could probably use this 90* v-banded bend
Also, if you have access to a good welding shop, you can have them make a custom dpipe:
s2kadl, could you post pics of your DP when you get it back?
EngineerX, I have access to a great fabricator & the parts you posted are exactly what I was looking for to make my custom downpipe work.
With those parts I can fab a DP that's close to the nissan one I posted.
Thanks.
BTW will this flange work with the greddy turbo? It's the one they recommended for their oval to round transition. It's a bit cheaper than the one you posted.
Check this out... A little pricey @ $115 but if you add flange+transition+90* bend
45+18+36 = 99 + welding then $115 starts to look better. You would have to cut the flange and weld another bend + straight to make a dpipe out of it 70MM TURBINE OUTLET ELBOW FOR STOCK TURBO OR STOCK REPLACEMENT TURBO, ALSO FITS TRUST T517Z/T518Z TURBOS http://www.optionimports.com/merasto2hosr.html
It shouldn't be that difficult for any decent fabricator to weld the flange/bellmouth transition/3" bend to make a dpipe
that other flange is cheaper bcause it's regular steel. The one I posted is stainless. If you can spare a few more bucks... stainless is so much nicer as it won't get rusty nasty.
It does look like it would work. It's listed to fit GT25 bolt pattern. By looking at pic you can see the holes match the GT3071R bolt pattern. But I don't particularly like all those extra bolt locations. I would call ATP and see if they can confirm fitment, but they don't have the most knowledgeable salespersons there.
Left is the stainless flange I suggested. Center are the dimensions of the GT30 turbo flange and on the right the flange you asked about
06-16-2009, 02:14 PM
