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September 07, 2010, 01:12:34 PM
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Pages: [1]
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Author
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Topic: downpipe (Read 392 times)
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mikeyIII
Newbie
Posts: 3
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downpipe
« on: February 01, 2010, 05:26:55 PM » |
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Hi my first post
Does anyone make a downpipe for a top mounted turbo?
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mosk
Pooh Bah
Administrator
Three cylinders
Posts: 707
Been there, done that
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Re: downpipe
« Reply #1 on: February 01, 2010, 05:42:12 PM » |
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Not that I'm aware of. There are a lot of variables -- each manifold can place the turbo at a slightly different height, each manifold may/may not have an external wastegate, which needs to tie into the downpipe, etc.
However, having made one for my LC turbo header, I can tell you it isn't that hard if you are careful. You can buy the appropriate flange online (I recommend flanges with V-band clamps if you can afford to go that route) and then buy some drawn-on-mandrel (DOM) bends and straight sections. For example, do a search on SummitRacing.com for "exhaust bends", and you'll get pages of hits. I'd recommend stainless if you can afford it, but aluminized steel will work, too. You WILL want to include a flex section -- Road/Race Engineering has good prices on those in their DIY section.
Once you have the parts in hand, it's basically just a matter of carefully measuring them, very carefully cutting them and scribing their relationships to each other (i.e., number the pipes with a Sharpie somewhere in middle of each pipe, and scratch a line with a scribe or awl that indicates how they fit and "clock" together. Use a mix of single and double lines that cross the sections you are joining, so there's no possibility of mistake). Once they are cut and marked, take the collection of pipes to someone who can weld...and if you can weld yourself, hey, even better!
When cutting exhaust pipes like this, you really want to use either a metal-cutting band saw or a cut-off saw with an abrasive wheel. I used a band saw and worked very carefully to make sure my pipes fit as well as possible before I took things to the welder. Don't expect your welder to fix problems you create, instead, try to make your stuff perfect so your welder doesn't introduce problems into your "perfect" downpipe.
Finally, if you can afford to use 3" pipe, I'd recommend doing so, as I found there was a big difference between 2.5" pipe and 3" pipe.
Hope this helps,
Jeff
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« Last Edit: February 01, 2010, 05:54:54 PM by mosk »
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Jeff's 22R-TE PageThe vintage HTML ain't pretty(!), but the articles are still worth reading if you are new to the motor
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mikeyIII
Newbie
Posts: 3
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Re: downpipe
« Reply #2 on: February 01, 2010, 05:59:21 PM » |
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I'm only doing this once with the best parts. Thats what great about this forum. I just ordered a manifold from Steed. Now I need to get the right turbo. I'm in no hurry my truck is a toy I screw around with on weekends. I think its neat having a Turd and trying to polish it. Thanks for the help... Mike
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mosk
Pooh Bah
Administrator
Three cylinders
Posts: 707
Been there, done that
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Re: downpipe
« Reply #3 on: February 01, 2010, 06:51:44 PM » |
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> I'm only doing this once with the best parts.
Spoken like a man after my own heart. Check out these guys:
http://www.burnsstainless.com/
They may not be the best...but they are the best I've found. I used them for my exhaust parts, and I have no regrets. Kinda pricey, but they are outstanding to work with, and they have an amazing selection.
If you are using a T3 or T3/T4, Google around a bit. There are some nice T3 5-bolt exhaust flanges out there that have 3" V-bands welded to them. There are also some cast ones, but due to the tight space in the engine compartment, you want to use the lowest profile one you can find, and I found that the hand made ones were better for that than the cast ones.
-Jeff
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Jeff's 22R-TE PageThe vintage HTML ain't pretty(!), but the articles are still worth reading if you are new to the motor
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mikeyIII
Newbie
Posts: 3
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Re: downpipe
« Reply #5 on: February 03, 2010, 09:13:55 PM » |
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Jeff
I showed a pic of your downpipe to my fabricator (he drives a 90 4runner) no problem in stainless.
I have no turbo yet. How can I get in touch with Rick Tapp?
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