im kinda confused on what size housings i should be lookin for like if the compressor housing should be smaller then the turbine housing or the other way around or what not because i know that the smaller the housing will produce better spool up and create better low end power but i dont kno what to look for and also what about trim sizes i should look at if anyone could help me out that will be great

 

Well what car do you have and what motor do you have in it.. Also what do you have done to your motor..

 

compressor covers and turbine housings come in different A/Rs so that you can tune between each wheel size. So for each compressor wheel you might have 2 or 3 different sized covers before you jump up to the next biggest wheel with the smallest housing. So it's really a pointless question unless you already know the sizes you want. If anyone says 'oh, well if you have a b18b than you need to get a .60 A/R compressor' just smile and nod.
hope that helps.

 

I might have kinda read this the wrong way.. I was assuming he was asking for what size turbo he should use meaning a t28,t3,t4,ect..

I actually would like to learn more about the different trims on turbos.. Is there anywhere on the net that this is documented in more detail..