Downpipe question

[Ranger4banger97]

Like the title says, i've got a question on downpipes. I'm new at turboing, but i do have the basic knowledge on boost considering i did blower service for a TAFC. Anyway, I'm looking at turbos to buy, and im looking at the backs of the compressors, and they say theres a 5 bolt flange for easy downpipe fabrication. I thought you just t-clamped a pipe on the back of the turbo :didimiss: ? Can someone clear this up for me? And if i do have to make a downpipe, does someone make one? :thanks:

[salating]

some turbos come with a v-band flange on the back

others dont like the ones out on the turbo coupe

but you can get a 5 bolt flange that has a v-band on the back of it on ebay


what kind of turbo are you planning on running?

[freebyrd24]

heres a few pictures of what i got, just off ebay. on my turbo, the exhaust has a 5 bolt flange. you can see in the pictures the flat side attaches to the turbo side, and the other end has a v-band setup welded onto it already. for my downpipe i just have a 90 degree bend and a 45 degree bend im going to make. on the side that will face the turbo, im going to weld on a v-band like on the 5bolt flange. those will get put together with a v-band clamp. hopefully this will clarify

[Ranger4banger97]

I would to run a garret gt series, but if those arent in the cards by the summer, i guess i'll swing by harrys u pull it and try to grab a holset or something. So in order for me to run something with a 5 bolt on the back of it, i get the discharge flange, and get a v-clamp piece, and weld a piece of downpipe pipe onto the v-clamp? Just clarify that if i didnt get it haha

[Ranger4banger97]

I'm acually doin more reading, and if i were to choose a free-float turbo, this would eliminate the whole 5 bolt plate system right? Then i can just connect a downpipe right to the exhaust outlet right? I'm still learnin so bear with me here haha, some pictures would do me a world of help

[freebyrd24]

The exhaust on MY particular turbo had a 5 bolt flange. Different turbos have different sized flanges with different # holes. So lets start from the turbo. You have the exhaust side of the turbo. From there you bolt on the exhaust flange. Now you weld on a v-band piece to the turbo flange. Now the downpipe is just exhaust piping. To attach the downpipe to the v-banded turbo flange, a v-band piece is attached to the downpipe. So you put the two v-band pieces together, and the v-band clamp holds those together. It's tough to explain, I can try to get some pictures up if its unclear. I'm personally a picture guy myself so let me know

[freebyrd24]

Wait for Jess to chime in here, If i remember correctly, he has a v-band piece welded directly to his turbo outlet. He has a Holset i believe

[Ranger4banger97]

Yea this is helping alot, pictures are always a plus, but im getting it. a v-band piece is welded onto a downpipe piece, and one on the flange, then a clamp in the middle. If thats it, then i guess i got it. But would it be better just to weld the downpipe to the flange for more of a seal?

[freebyrd24]

Hey no problem at all. Here is a good little visual of the vband setup. the piece on the right is what you would weld onto the downpipe. the second picture shows how the two v-band pieces go together. The last picture shows how the clamp holds everything together. V-band clamps are nice because they allow for quick and easy installation and removal of the exhaust pieces.

[salating]

the h1c jess had on there last time i saw it, it was part of the turbine housing

you will see the flanges on turbos that have an internal wastegate, not all but a good bit of them

turbos that have no internal wastegate usually do not have a flange and just have the v-band(bigger holsets are setup like this)

but every turbo is different

[Jesshwarren]

I can't find the picture I had for nothing. But yes I cut the stock 2.5" V-flange off of the 18CM Holset housing and welded the 3" V-band flange on. It is much like this HX35 Flange I made.

http://rangersrevenge.com/products/Holset%20Flange/DSC01047.JPG

If you have no other options You can always weld a V-band flange onto the turbo. Just make sure you have it done buy a good welder :) it would suck to mess up a good turbo.