Can sombody please explain the difference and benifits/disadvantage of the O, P, and Q trim wheel. Im trying to research and understand the various types of turbos . I am looking at a T4/TO4R which is offered in the three different types. Here is the link

http://store.yahoo.com/cheapturbo/garrettt4to4r.html

 

The O,P, and Q designates the diameters of the inducer and exducer of the turbine. Which is related to the flow capability of the turbine.

As the picture shows the O is smallest, and Q is largest. P is the most common. Unless the 10% added flow of the Q is necassary the P is probably a good choice. In the circumstance were you are looking for used turbine or t-hsg due to upgrade or damage the P-trim parts will be easier to find.

Someone correct me if I'm wrong: The trim (compressor or turbine) is the square root of the exducer flow area over the inducer flow area.

-Justin

 

that pic is useless...here's another

-Justin

 

i.e. this is refering to "54 vs 60 trim compressor" (or turbine). the t series turbos use the o, p, and q to effective communicate the same info which is flow capability.

-Justin

 

Ok,

how about the new GT series stages?

what do they corrolate to in the T series world?

 

Thanks for the info Pistonsuk