I got some OLD charge piping its got an old school HKS BOV. wondeirng if it will be too small for a .50/.54 turbonetics or a .54/.84 garrett.

The intercooler is 2.5" but the piping is 2.0" so not sure if i should just man up and get the 2.5" or if i can get by safe on the 2.0"

 

Turbo --> 2" --> IC --> 2.5" --> TB


JP

 

That's exactly what's on my car...works great...

 

thats what i ran on my b7, and thast what im running on my turbo ls. i havent run anything different so idk how it compares. no prob in running it tho.

 

i run 1.75" id hose from an eclipse

 

alot of ppl just use 2.5" because of fmic and tb sizes but i bet there is a lot to be learned about proper ic pipe sizing. i haven't come across any REALLY indepth articles on someone measuring and testing, do you guys know of any good threads?

btw im running full 2.5"

-Luke

 

I'd imagine that theres a point where the pipe ID starts to get too small and would decrease turbo flow. I think you would want piping just above that point, where ever it is, so lag is less of an issue but flow isn't compromised.

I'm not giving any specific sizes, just a theory I thought of after reading his post ^ but yeah 2" will be fine, you probably get slightly less lag and it'll still flow good, although it's probably hard to tell between 2.0" and 2.5" with turbos in these sizes.

 

based on your thinking, it would make more sense to have smaller piping, more pressure= less lag. i wouldn't run less than 2" for sure either way though.

 

Yea, I was taught this. Outlet size of turbo to IC then TB size for the cold size which usually puts most of us at 2" hot --> IC --> 2.5" cold. The concept is it takes less time to fill that smaller volume of pipe and the 2.5 cold is better for flow to that sized TB. Of course, as theories go....


JP