'66 Slant Six Turbo Build

360duster said
cool build for sure and impressive numbers!

but i dont understand this: "The gt32 is pretty small, and needs a lot of pressure to move a lot of air."

Isnt the air flow first and then the pressure because of "too much airflow into a closed volume"?

Michael

I've always know flow in lb/min and pressure as two different things which are related.

PSI is measuring density and flow lb/min is how much air is moving through the system and how quickly. Flow lb/min is ultimately what determines your peak power.

A small turbo has to react to an engines appetite by increasing the density of air it puts out to keep the flow up with what the engine can flow. With my current setup if I port my head and open up my exhaust it will increase my VE, the engine will become more efficient and flow better, produce more exhaust, spin the gt32 better in effect pushing it to create more psi to keep up with the flow, however, since the system is running more efficiently there will be a bigger return on the pressure - more power. It's all related and all way to technical for me :mrgreen:

Conversely, if I just slap on a larger turbo that can move the same amount of air at 8-9 psi, like a gt35r then my peak power will remain similar if i make not other changes to increase my VE. The power band will shift but over all flow will remain comparable.

Have you ever taken a look at compressor maps? They help visualize what I'm saying here.