.63 and .85 exhaust housings

[49-blues]

what exactly are the physical differences between these two housings? i know the .85 is larger and takes more of a converter but can you physically see where they are different?

 

[SRGN]

Turbocharger Guide

The housing should have the a/r stamped on it somewhere.

 

[callmeebryan]

Think of it as a ten speed mountain bike....

In a low gear, the bike is very easy to accelerate and you are quick to reach the maximum possible pedal speed (IE, you cant pedal any faster)

In a higher gear, it takes more force to accelerate but the potential for a higher top speed is greater.

Hope this makes sense :biggrin:

 

[Alky V6]

When you look down into the scroll through the flange, the passage will shrink down and then one wall will open toward the turbine wheel. At that point in the passage way, the area of the passage is larger in the .85 than the smaller one. I just recently was studying the difference between my .82 and .96 4 bolt flange units and the height and width of the passage at the point I mentioned is larger by almost 1/4 inch each way.