Join Date: Jan 2009
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A/R is a ratio, so it can vary from turbo to turbo. A= Area of exhaust inlet and R= Radius of the housing from the center of the turbine wheel to the center of the exhaust inlet. The Area divided by the Radius is your A/R. So really you need to know your A/R and either the inlet area or the Radius, you can't figure it out with 2 variables remaining, there are too many possibilities.
What turbos did you have in mind? If you know the inlet type, like T3 for example, that will give you a decent idea of what you're dealing with since most t3's will have roughly the same inlet area.
2000 2500 reg. cab 4x4 auto 577hp
09 6.7L QC LB stick, 4x4.
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