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Tippy Tippy is offline
Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 7,994
Sizing ITB's for boost and IC configuring?

So, I know the conventional wisdom is bigger the better for NA applications where all out max hp is required (until point of diminishing returns), but what about boosted applications?

I have a Carrera 3.2 (3.4) with stock intake port sizes (42mm IIRC) and I believe the OEM 3.2 intake are the same throughout until the runners meet the log parts of the manifold (assuming here?).

So, question is, do you run like a 44mm ITB (account for butterfly area diminished to get back to 42mm total area) or something like 50mm plus?

My brain is saying something like 44mm for good driveability (high velocity) but I see so many ITB's out there far larger making me have doubts.

Also, trying to figure configuring existing IC I have to work or if I'll have to go with a totally different end tank arrangement?
Cory - '87 C3.2 (3.4, stock 3.2 heads, cams, intake, with 75mm Mustang TB) Guards/Blk - turbos new to old 1). Borg Warner S366 (66mm comp/73mm turb/0.91 T4 divided ~1.4 bar), 2). Holset HX40 8-blade (58mm/"P" trim 0.84 T4 divided 1.4 bar), 1/4 mile 12.02 @ 129 MPH (street tires), 3). Turbonetics 60-1 HiFi (60mm/"P" trim 0.81 A/R T4 open 1.2 bar), 431whp - MegaSquirt II/EDIS ignition/80lb inj
Old 03-16-2014, 08:12 AM
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