Quote:
Originally Posted by R2
A little clarification on where the 10% comes from would be great. You mention coated rotors, which to me means you'd have better sealing and less blow-by between the rotors/housing/etc. So, presumably this increases volumetric efficiency vs. the standard 210 unit.
I have two questions regarding this:
1)Does this increase that volumetric efficiency at all supercharger speeds, or more so at higher rpm?
2)Does the adiabatic efficiency improve at all rotor speeds and pressure ratios as well (especially lower pressure ratios)?
If I am interested in a low power installation, either the 210 with the 75mm pulley or the 210+ and the same pulley, would I see any difference between the two? Could I get away without an intercooler easier with the 210+ as compared to the 210?
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The clearances are very tight already. The rotor coating fills in the last of these gaps as best it can. .003-.005 tolerance does not leave much wriggle room. The coating goes after that last shred of efficiency.
The volumetric and adiabatic efficiencies both increase at all RPMs. You would see the power increase on a non-intercooled application using the same pulley. You would be less pressed to use an intercooler or smaller pulley, but the gains would still be there. This leads me full circle back to the 10% I was talking about. The coating just goes after that last bit of efficiency left on the table inside the current unit.