93LSivic

Just like the topic states. If I were to purchase a turbo. Lets say T3/T04e--- .48 stage3 turbine and .57 compressor.
If later down the road I decide I want more boost and build my motor. I would want to goto a .63 turbine. Now, if I get the stage3 .48 would all I have to do is buy a new .63 stage3 turbine housing and swap it out myself. Or would I have to buy a new turbine wheel and housing.

Cliff notes:
It the stage3 .48 housing turbin wheel the same size as the .63 stage3 turbine wheel. And are the housings interchangable?

Thanks, and oh yeah--- Happy New Year

Dee

upgrading from an AR.48 to an AR.63 is as simple as removing the smaller housing and adding the new housing. Stage III = stage III since both housings are T3. The blade diameter isn't changing so the housing diameter isn't going to change. What changes is the smallest diameter of the housing inlet and the radius of the snail itself.

Ex housing AR= radius of the snail divided by the smallest diameter of the inlet
Comp hsg AR= radius of the snail divided by the smallest diameter of the outlet

This is from one of my previous AR discussions.
people use ASPECT RATIO and AREA/RADIUS..
the meaning of AR has been explained to me two different ways:

1). Divide the smallest diameter of the compressor outlet by the radius of the compressor housing (diameter of the back plate divided by two).

2). Divide the area of the compressor housing by the smallest diameter of the compressor outlet.

Ans #1 came from an HKS tech rep and ans #2 came from a Greddy tech rep. I did a lot of research and ans#1 seems to be the most correct. I just measured one of my extra T3 housings just to be sure.

Inside of the compressor housing outlet is an AR.60 stamp.
The backplate diameter is 132mm
The smallest diameter of the outlet was 39.5mm. I used a straighten paper clip and a micrometer to measure this.

132/2 = 66= radius of backplate
39.5/66 = .5984 or AR.60

Those tech reps were engineers who helped design the HKS GT series turbos and the Greddy Hybrid turbos(T67, T78, T88)





[Modified by drealgsr, 9:03 PM 1/1/2002]