subaru IHI exhaust flange/downpipe
 

i pulled out my IHI and have been looking at it... it seems that you can't use a flat peice of metal for the down pipe... this true? it just seems that the WG flapper wouldn't have much room to open w/ flat stock...

those that've used this turbo... how did you get around that issue? i've got a few ideas but am looking for more

thanks
mark

Re:subaru IHI exhaust flange/downpipe
 

thats a good point. i just looked at mine too.. hmmm. ---- idk lol.

here's my stuff:
http://www.rit.edu/~ltk6260/my-bewst.html

Re:subaru IHI exhaust flange/downpipe
 

ya i pulled one of the turbos a few years back and got it free from the junkyard... somethin about it not having any wheels on it ;-) but i can't rember what the flange looked like at all

mark

Re:subaru IHI exhaust flange/downpipe
 

I've got a flat dp flange mounted on my subie mitsu turbo and it opens up fine.

Re:subaru IHI exhaust flange/downpipe
 

I notched the flange a little where the wastegate flapper would hit.

I got the turbo upgraded with a 50-trim compressor wheel ( garrett ), clipped the turbine 15degrees, and rebuilt. After I did that, I figured I'd let a little more exhuast out and took the exhuast flange to my work ( they have a plasma cutter ) and we ovaled out a peice of 3 inch piping with a big vise. Then we traced where the 3'' piping would be mounted and then cut the flange. Anyway, check it out. http://pg.photos.yahoo.com/ph/maximu...bum?.dir=/49a9

Car screams on 7psi like it used to on 10psi !!

Re:subaru IHI exhaust flange/downpipe
 

Also, that's on nice parts bin you got there !!!

Re:subaru IHI exhaust flange/downpipe
 

Well good news for you guys and bad news for me...
Good news first.. The wastegate diafram only lets the swing arm "swing" so far, and it can't possibly swing far enough to hit the exhuast flange ( tried, but its just not going to happen ) so all of you guys worries are over as far as that subject goes...

Bad news ( me only ). I found that 1 of my only 3 couplers was leaking maissivly ( which is why I was only running 6psi ). So I built a leak tester real fast... I found about 2 descent leaks, and 2 pin hole leaks, but I guess its good I found them.

Re:subaru IHI exhaust flange/downpipe
 

haha thats about what i was thinking... 4" exhaust... other thing i was thinking... also was thinking to put a bit of metal on the backside of the flange so the exhaust and WG where fairly divided keeping turbulance to a minimum... i've seen a few sr20 DP's for t25's like that.

but i think the 3" thing looks easier... did you just use a long stright pipe and cut to suite?...

thanks
mark

Re:subaru IHI exhaust flange/downpipe
 

why thank you. i fully enjoy looking at it often 8) hahah

well thats good news about the flange. i was worried for a while

Re:subaru IHI exhaust flange/downpipe
 

hey I did the same thing before everything got installed....I layed the parts all over my room lol