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Turbo manifold pipe size

 
Old 11-05-2009, 12:03 PM
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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, 02:06 PM
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im using 1.5" fwiw
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Old 11-05-2009, 02:15 PM
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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, 02:29 PM
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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, 02:49 PM
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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, 02:50 PM
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I'll be building one this winter with 1.25.
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Old 11-05-2009, 02:58 PM
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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 06:13 PM. Reason: Clarity
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