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A Look at Turbo Flanges Found on Common Turbochargers

Contributed by:Trust d ruction

Some Flanges Sound the Same, but Aren't...

I want to start out by pointing out that some turbo flanges have almost the same name but are actually different. There are the standard sizes, and then there are the odd-shaped flanges that came on some car manufacturers' OEM turbochargers.

Examples of these are the DSM (Diamond Star Motors... Mitsubishi/Eagle/Dodge-Chrysler) T25 flange and then the Standard T25 flange, which some people loosely refer to both as a T25, which can cause confusion. It's important to know when buying your turbo parts that a DSM T25 flanged turbocharger will not fit on a Standard T25 flanged manifold (without an adapter flange... we'll get into that later). Same goes for the Early-Chrysler T3 and the Standard T3.

Some of the Most Common Inlet Flanges

Standard T3 (TK030)

Fits all T3 and T3/T04 (a.k.a. T3/T4) type turbo’s. Fits most early Ford, Saab, and Z31 300ZX turbochargers. Will fit early Volvo turbo’s but the turbo will need to be machined down.

There are more than one kind of the standard flange, as some turbochargers have twin scrolls, but the flange is otherwise the same dimensions. The purpose of having twin scrolls is to equalize the exhaust pulses flowing to the turbine.

There is also a special flange available for the early Volvos where no modification should be needed (TK214), but the flange is otherwise the same basic dimensions. There is also a special flange for Turbonetics turbos that has a 15% larger port, but the flange is otherwise the same basic dimensions. All TK030 flanges come threaded in 10mm x 1.5 pitch. TK214 is threaded in 8mm x 1.25 pitch.

Standard T3 (TK030)

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