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Discussion Starter · #1 ·
Do the T66-T76 turbos bolt up to a standard t04 flange? Would the flange on the header need to be different for divided housing, on center, etc. turbo exhaust housings?

Supra OG
1,002 Posts
All the common turbos... Turbonetics T-Series.. Sound Performance SP Series.. Innovative T Series.. Garrett GT series.. Greddy T78/T88... they all fit the standard T04 flange found on all common headers, including the Turbonetics/Toyomoto/PHR/DirectedEngineering cast manifold, HKS Header, Greddy Header, Sound Performance Header, etc..

Hope this answers your question.

BTW in the past I've heard a LOT of speculation about the Greddy T78/T88 flange being a different Mitsubishi flange and not bolting up to the Garrett T04 flange. I thought it was true till I saw with my own eyes a P-Trim Turbonetics exhaust housing bolt right up to a T78 header on a friend's car over at CTC.


Discussion Starter · #6 ·
So you know, a on-center housing will change the position of the turbo when compared to a tangential (much more common) housing. They both bolt onto the same flange, but the compressor side will end up being about a 1" difference in position because of the shape of the turbine housing.

The downpipe is trickier. There is the most common "V-band" which SP turbos and Turbonetics use. Most Garret tangential housings use this discharge type.

On-Centers turbines use a circular 4 bolt discharge.

Greddy and HKS use their own square 4 bolt flange.

You can have the downpipe modified cheaply though. For instance if you take a Greddy downpipe, cut the square flange off the very end, and weld on a $20 v-band lip, you could run a Turbonetics or SP turbo on a Greddy T78 kit...minus the T78.

Note...the above discharge types are not ALWAYS true. You put a circular 4 bolt flange on a tangential housing, some housings have a "slip on" discharge that allows you to put your choice of discharge types. This is done rarely (seldom there is a reason to), but CAN BE.
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