Relationship between compression ratio and streetability???

[Fuelie Fan]

Not necessarily true. I'm sure you've seen compressor maps. If you are turning a centrifugal compressor slower than it is designed for, you may be operating at a point of lower efficiency, which by definition means higher temps. Yes, temps will be lower at 8 psi than at 14 psi. But, assuming the same outlet pressure, the wheel spinning within it's designed range of speed will have lower temps than either a wheel spinning too fast OR too slow.

[camcojb]

Not necessarily true. I'm sure you've seen compressor maps. If you are turning a centrifugal compressor slower than it is designed for, you may be operating at a point of lower efficiency, which by definition means higher temps. Yes, temps will be lower at 8 psi than at 14 psi. But, assuming the same outlet pressure, the wheel spinning within it's designed range of speed will have lower temps than either a wheel spinning too fast OR too slow.

I agree. What I was getting at is there's a lot of the centrifugal guys going one step larger on the blower and slowing them down; they claim extremely promising results. I've had good luck running the size that I need.

Jody