Here are some specs

TO4B turbine wheel
54mm compressor wheel
compressor a/r .60
turbine a/r 1.15


Oh yeah, this is going on a 250 small block chevy. I talked to Ralph who's going to tune my car and he said I should chang the exhaust housing to something like a .80 a/r. And although Ralph knows what he's talking about I did not give him all the info at the moment. But from what I've read the TO4B turbine spools pretty fast. And on top of that I have 175ci of displacemnt to each turbo.

Hey Ralph, if you're reading this help me out. I want to get everything setup so there are no surprises when the day comes.

 

twins or single? i'm assuming twins, and if so, hot side ar is way too big, go w/ the .8.

 

i'm assuming this is for twins not a single. if twins hot side a/r is too big, go w/ the .8.