How are turbo's rated?

[turbowrenchhead]

When you have a 60 and 61 and 63 and 64, what exactly does that mean? I know that the larger the number the larger the turbo. But can anyone tell exactly what the differences are. Is it cfm and the compressor wheel? Also the exhaust housing, A .63 housing what are they measuring? I would like to know what it all means.

 

[WFO]

this chart will explain damn near everything.turbo flow is based on the wheels and housings.the te(integral inlet bell) housings flow more than the ta housings(bolt-on bell).with exhaust housings the #'s(a/r,or area to radius ratio)basically break down to a higher the # will give you more lag but more top end.


http://www.gnttype.org/techarea/turbo/turbowheels.html


as far as maufacturers #'s go there isn't always any rhyme or reason.look at what turbos have what wheels and what the dealer calls them .

pte te-63=jc te-45
pte ta54=jc ta-61

you get the idea.have a good look at the chart,there's really a lot of info there.

later,sean