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Turbo Manifold Tubing

Old 03-30-2004, 10:21 PM
Thread Starter
Join Date: Oct 2002
Posts: 47

i have a guy that is willing to build a turbo manifold for my t66. should i use 1 1/2 or 2 inch tubing for the runners? also what size should i use on the wastegate piping. would the 1 1/2 inch be sufficient enough to prevent creep? i want fast spooling to minimize the lag i will have with running a large turbo on the street. anyone have any direction on where i should go?

another question is should i use the .96 undivided that came with the turbo or should i use the 1.00 divided that i have on my present turbo and have the builder fab the manifold with the open or divided outlet? i am looking for 500rwhp at 19-20psi. whether or not i find it is up in the air b/c of the dilemmas i am facing.

to answer questions that i'm sure will be asked, currently i have a 60-1 with the infamous OBX "ebay special" manifold (that leaks like a stuck pig), an HKS 50mm racing wastegate w/a 1bar spring, and all the strong supporting hardware for a single on a large streetport.

please help and give good reason to back up statements. the machinist says that the 1.5 would be better for velocity, but i figured that is too small when running that amount of boost. what do you guys think?



Its probably a better idea to copy and paste rather than linking. - 94T
spoolin is offline  
Old 03-31-2004, 12:00 AM
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Join Date: Oct 2002
Posts: 47

anyone have any input?
spoolin is offline  
Old 03-31-2004, 08:15 AM
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Join Date: Oct 2001
Location: Peoria, AZ
Posts: 10,906

flange: little bigger than 2" holes for runners- 2.16 internal diameter

2.38" outer diameter primary runners.

1.68" internal diameter for wg runners.

Thats what I am going to use.
1Revvin7 is offline  
Old 03-31-2004, 11:18 AM
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Join Date: Dec 2003
Location: Southeast
Posts: 502

I am currently fabricating the manifold for my FC and here is all the pieces I got.

Manifold Flange: 1\2" thick

Turbo Flange: 1\2" thick

4 - 2" schedule 10 stainless steel 90 degree Weld elbows for manifold runners

2 - 6" schedule 10 stainless steel straights

2 - 1.5" schedule 10 stainless steel 90 degree weld elbows for wast gate runner


2.0" schedule 10 = 2.38 OD, 2.16 ID thick

2.0" schedule 40 = 2.38 OD, 2.07 ID thicker

Schedule 10 should be fine to work with, also you dont have to go with the SS you can use mild steel weld els also. These bends can be had at McMaster Carr. I got my material at a local store. I will post a few pictures later on k.
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