NOTE: The following is copied from http://www.hondacivicforum.com/forum...br /> t=77432 and was created by trustdestruction, a moderator at Hondacivicforum (credit where credit is due.)


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

To start out, realize 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 turbocharges.

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 turbos. Fits most early Ford, Saab, and Z31 300ZX turbochargers. Will fit early Volvo turbos 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)


Twin Scroll:


Early Volvo (TK214):


Turbonetics:


Standard T3 (TK030)





Early-Chrysler T3 (TK100)

One of the most popular junkyard turbochargers ever! Whether its the actual Garrett Chrysler T3 turbochargers or the later Mitsubishi version (same engine) this flange will fit. To use with all TURBO I & II turbochargers.

All TK100 flanges come threaded in 3/8 in. x 16 pitch.








Standard T25/T28 (TK010)

This flange is used on most T25 & T28 turbochargers. Common to Z32 300ZX TTs, Silva/bluebird/GTiR SR20DETs, and GM 2.2L Turbos. This is also the type of flange that the Edelbrock Performer X turbo kit uses, and their turbo manifold.

All TK010 flanges come threaded in 8mm x 1.25 pitch.








DSM TD05/T25 (TK011)

This flange was mostly used on just Mitsubishi DSM 4G63 Cars (Eclispse, Talon, Laser). If you have a T25 from one of these cars, it won't use the Standard T25 flange, it will use this flange. GReddy likes to use this flange on a lot of their turbochargers too.

TD05-13G, TD05-14B, TD05-16G (in order smallest to biggest) have the same basic dimensions but the port in the center is a different size on each one. So, if you were to put a 16G turbocharger on a 14B manifold you would have some restriction. I don't have a picture of the 16G flange... imagine a 14B flange with a larger port. The 14B flange and the TD05/T25 (TK011) flange appear to have the same size port. I am not 100% sure about that, but I think they do.

DSM TD05/T25 (TK011)


TD05-13G:


TD05-14B:


DSM TD05/T25 (TK011)





T04 (a.k.a. T4) (TK053)

This flange is common to alot of medium frame turbochargers. T04E, T04B, and T-series are some of the most common. 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.

All TK053 flanges come threaded in 3/8 in. x 16 pitch.



Twin Scroll:








T6 (TK310)

These are for very large turbochargers, found on some turbocharged vehicles with large engines.
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.







Toyota CT25 Single Entry (TK173)

Toyota CT25 Single Entry (Turbochargers from MK3 Supra & ST165 Alltrac)
All TK173 flanges come threaded in 10mm x 1.5 pitch




Toyota CT25 Twin Entry (TK197)

Toyota CT25 Twin Entry (Turbochargers from MR2 & ST185 Alltrac)





Mitsubishi 16G Twin Scroll

This flange fits the popular Twin Scroll Mitsubishi Evolution Turbos from Mitsubishi Evolution VIII, IX, and X.






Flange Adapters
You can sometimes use a flange adapter if you want to put a turbo on a manifold that has a different flange.
Here is a website I found that sells a lot of flange adapters: http://www.bmcrace.com/index.php?cPath=60_62


Credit:
http://www.jgstools.com/turbo/tif.html
http://www.bmcrace.com/index.php
http://www.jgstools.com/turbo/trbflg.html

 

Awesome. As the mt.net resident noob, I've found turbo/flange names and compatibility to be among the most difficult pieces of information to assimilate.

 

matthewdesigns adds some further information:

I have a couple of photos that will show the difference in size between a 14b and 16g Mitsu flange.

And just an fyi in case you didn't know, the 14b and 16g turbine housings are also referred to as 6cm^2 and 7cm^2, respectively, as a reference to the inlet area. Yet another bit of confusing info, even within the DSM community who normally deals with these turbos, but handy to know if gaskets are being purchased.

DSM's have a fire ring, which sandwiches b/t the ex mani and turbine housing, and a step/lip on each to hold it in place. The ring serves to smooth airflow and protect the gasket. So, the gaskets are sized to fit on the outside of the fire ring. The gasket shown is for a 7cm^2 inlet, but the actual area available for airflow is smaller thanks to the fire ring, which is why in one image I labeled the inner diameters of the 6cm^2 and 7cm^2 fire rings. Most folks port the step/lip for the fire ring out of both the manifold and turbine housing (you can see in the EvoIII mani the step is gone).


Here are some shots that I took while swapping from a stock DSM exhaust manifold to one from a Lancer EvoIII. The manifold mostly visible is the stock DSM, with the gasket overlaid and a step visible inside it. The manifold on the left that's cropped out is the EvoIII.