Engine Builders talk.
Senior Member
Joined: May 2009
Posts: 2,926
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From: Tallahassee, Fl
. That's why any good tuner should typically be sending you a start up email tune, have you load it, do a few moderate street pulls, datalog it and send them the files, they revise the tunes as needed and have you do some wot pulls and datalog and revise as needed. But again that's typically on one off or non typical builds. Regardless of what type of power you are making, it's more of a question is it a combo that's been done pretty commonly, or more of a one off build which would need more data logging and tune revisions
Joined: Sep 2008
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From: Ohio
Senior Member
Joined: May 2013
Posts: 20,710
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After selling those treadstone manifolds I've been working on my own headers. I was contemplating on the 16 gauge stuff until I talked to a local welder. He told me to go with schedule 40 1.25" pipe for support and longevity on the primaries. The 1.25" pipe is 1.660 where as the primaries on most flanges are 1-5/8= 1.625. So I'll shave a the 35 thousands off each end to get them to fit. The inside diameter is a little smaller, but should hurt performance at low rpms. I will be running primaries to a collector due to the volume and back pressure.
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Joined: May 2011
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