Hey hows it going. I have a 96 civic running a custom turbo setup with a stock nissan turbo from a rb25. I want to upgrade the turbo, and i was looking at the gt28rs, since it would be a dirrect "bolt on" swap on my setup, since i am running the same 5 bolt flange on my downpipe as a sr20 or rb25. But my question was, how much bigger is the compressor housing. I had to shave a good deal of my block to fit this turbo on that i have now, and i dont think i could shave it more. Is the gt28rs compressor housing physicly larger?


Thanks alot,
Derek

 

Here is a picture of how the turbo im running now fits.

 

i thought they were going to fix that problem ?

 

It should be fixed, but if this turbos much larger it still wont clear. there is only so much room between the block and radiator

 

On the left is a GT28RS (disco potato , keep in mind this turbocharger has a internal wastegate (actuator) ) on the right is a stock s13 sr20det t25 turbocharger. Both are pretty much the same size. I believe the RB25 turbo is a T3 flanged turbocharger , so to get a true bolt in replacement/upgrade for your setup i'd go with a GT28RS t3 flanged turbine , but you would end up having to go with a external wastegate (something i'am sure CMS can do for you). But either way you shouldn't have clearence issues.

Edit: By the way these pictures are from sportcompactcar's website, courtesy of their project silvia.

 

external wastegate isnt a problem. thanks alot for your help.. rep points for you

 

No problem , and thanks.
atpturbo(www.atpturbo.com) sells disco potato's with a T3 flanged turbine inlet, but he would have to cut/weld on a external wastegate flange , so he can make use of it. Since it does not have a internal wastegate like the RB25 T3.

 

No problem.