so i ordered a 4" vband flange and its too big for my hot side of my turbo, but the 3 inch is too small! im thinking either to get a 3.5 inch or could i just weld the flange i already just bought onto the hot side of my turbo? im not experienced in this type of area so i figured id ask a few of you and see if it made sense to do something like this. the turbo is a bw s360, and the inner diameter of the vband flange is 4" that i just purchased. the outer diameter of the hot side of the turbo matches the i.d of the flange. can i have this piece welded onto the hot side of the turbo? or is that a bad idea to do something like this???

 

Your outlet is 4.21"
You need a BW specific v-band flange & clamp. Google it.

 

^ Exactly. Turbo manufacturers have specific vbands designated for their turbos. Precision is the same way.

 

like they said...I had a problem finding the right v-band for my PTE. worse comes to worse, contact BW directly

 

just order a OBX vband 4" setup. Fits perfect.

 

on a borg warner s300? the o.d. is 4.21 and the i.d is(iirc) 3.5

 

Yes if you don't mind running a 4" DP or a reducer

 

the dp i have IS a 4"

 

So you will be good then

 

with an obx one?

 

Yes. OBX 4" flange fits perfect on the housing

 

So the obx vband ring will sit evenly with the turbo I have? I'm not talking about the I.d. I'm talking about the o.d. of the ring. The one I had was wayy too big and the I.d. was the part that sat flush with the o.d. of the housing. I need both the o.d.'s to match up. Not vice versa

 

It's close enough that it doesn't leak

 

you can weld it, ive done it twice now with no cracking or leaks from the weld.

disclaimer: im not a professional welder lol!