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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 11-05-2009, 01:03 PM   #1
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Default Turbo manifold pipe size

Im wondering what size pipe we use for the header pipe. Im thinking its sch. 40 1 1/4" which has a 1.66 OD. Can anyone confirm this?
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Old 11-05-2009, 03:06 PM   #2
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im using 1.5" fwiw
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Old 11-05-2009, 03:15 PM   #3
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is that the OD?

Hey just got the miata to pass emissions. i finally get to replace my 01/2008 tabs.
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Old 11-05-2009, 03:29 PM   #4
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1.5" SCH10 (1.9 OD) is what everyone uses.

I considered making a 1.25" to see the spool vs peak power difference between the two. You may need to use one of strainghlinespecialties' transitioned head flanges to fit a 1.25" pipe though, since I don't think 1.66" will stretch enough to match the oval port.
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Old 11-05-2009, 03:49 PM   #5
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Quote:
Originally Posted by sbkcocker499 View Post
is that the OD?

Hey just got the miata to pass emissions. i finally get to replace my 01/2008 tabs.
Nice dude! Thats no small feat with a standalone ECU!
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Old 11-05-2009, 03:50 PM   #6
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I'll be building one this winter with 1.25.
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Old 11-05-2009, 03:58 PM   #7
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I have enough 1.250" sch.40 mild weld els to make a mani some one could talk me out of,Not a formal offer of sale just point of interest.if a reader of this thread wants them come and get them orsend me some shipping love and you can have them.
-G-

Last edited by Reverend Greg; 11-05-2009 at 07:13 PM. Reason: Clarity
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