I am curious too, eagered to know

 

I'm not 100% but I think the flanges are the same only where the bolts go through are different.

 

im not 100% but i think the flanges are the same only where the bolts go through are different.

Well if the bolts are different, that is what I need to know.

 

t3 is a rectangle flange. T4 is a square flange. T4 can be a large frame, and uses larger bearings. T3 is small frame and uses smaller bearings.

 

so when they say t3/t4 are they saying a t3 exhaust side and t4 compressor? I read people saying different things and im sure its that way not the opposite.

 

So that means the four bolt holes on mine are not on a square; meaning I have a T3 flange, and will need an adapter plate, or custom made manifold?

 

All wrong. Both flanges are rectangular. The T4 is just larger. The T3 does happen to be more rectangular (meening the length:width ratio is larger). They are entirely different. Neither one can be made to work with the other. A T3/T4 turbo is a turbo with a T3 (small frame) turbine side that has been mated to a larger frame compressor wheel. This would be something like a GT35/40 (not exactly, but similar).

Limit Engineering has pdf's of different sized Garrett turbos. In these you can find the turbine inlet flange dimmensions. The T4 is something like 3.5" X 2.75" if I remember correctly.

Daniel

 

Found it...ATP turbo website:

T4: 3.50" X 2.75"
T3: 3.38" X 1.75"

GT35R

GT40

Daniel

 

Umm, the dimensions on my turbo are a little different :scratch: I have the 2.75, but I do not have the 3.5 . . . it seems closer to the 3.38 :faint: I mean my turbo is based on the GT35 but . . .

 

dunno what to tell ya. Have you ever bolted it to a common supra manifold?

 

Go here and scroll to flange sizes. I got this link from another helpful thread.

http://www.forcedinductions.com/help.htm

 

It appears there are some errors on both sites (ATP and forcedinductions). The T4 is shown to be 3.25" wide on the forcedinductions site which I think is actually correct. However, it also shows the width of the T3 to be 1.00" which is definitely wrong.

Daniel

 

IT also depends on what turbo they measured off of.... some of the cheap chinese turbos are WAY OFF.

A REAL t3/t4 is a t3 center section with either a t3 or t4 flange, but with the bigger shaft, turbine and compressor of a t4 turbo.

 

The T4 is shown to be 3.25" wide
Daniel

I like that information, that leads me to hope that I do have a T4 flange. I will but a Manifold that is T4 and if it does not fit I guess I may have to get an adapter or just get a bigger turbo

 

Yes you have a t4 flange, non divided.