2nd Generation Specific 1986-1992 Discussion

downpipe material

Old 01-11-2007, 02:27 AM
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what size/material do you make turbo downpipes out of?
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Old 01-11-2007, 09:52 AM
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home depot pvc pipes
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Old 01-11-2007, 11:53 AM
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that could end very messily. Unless you can bend a 2.5 to 3" dia steel pipe, and weld on flanges... just buy a cat replacement pipe
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Old 01-11-2007, 01:39 PM
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inconel!!!



no but seriously SS or painted mild it really doesnt matter all that much as far as function goes.
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Old 01-11-2007, 02:00 PM
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Ideally 321SS, however good luck finding it in a decent size and be prepared to pay a lot
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Old 01-11-2007, 04:02 PM
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is ss304 a goog alternative to ss321?
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Old 01-11-2007, 05:26 PM
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ss304 or aluminized steel is good and is easy to work with and there is almost endless sizes and bends out there avalible to make almost anything.
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Old 01-12-2007, 04:18 AM
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if i thought ss321 was to expensive why could i not use ss 304?

It seems to be about 1/3 the price from http://www.burnsstainless.com/304tubing/St...traight304.html



mechanically speaking they are really similar

the melting point of ss321 is 1400-1425C while ss 304 is 1400-1420

the only main difference i can find is the coefficient of thermal expansion of ss321 is 16.6 vs ss304's 17.2 at 100c. these numbers get closer as temp increases. i dunno... i doubt the difference in the amoutn the materials expand would be noticable.



everyone says to use ss321 but it doesnt quite all add up to me. im sure im missing something..... does anyone know?
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Old 01-12-2007, 04:20 AM
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o and what size piping do you normally use coming out of the turbo. where can i find the outlet diameter of the turbine?
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Old 01-12-2007, 11:44 AM
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depends on what housing you have and what exhaust you want to run. most outlets are 3" but some are 2.5"



oh and dont buy from burns stainless, they are the most expensive place you could possibly find, just look around and you will be able to find some cheaper prices.
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