Ford Modular Motor Forced Induction Dyno Comparison - Boost Bash Part 1
Eaton Roots vs. Vortech Centrifugal (11 psi)
Here is a perfect example of why I hate to see tests run where only peak power numbers are supplied. On the surface, that the Vortech supercharger produced 667 and 532 lb-ft of torque seems like a sizable gain over the 572 hp produced by the Eaton, but these numbers are somewhat misleading as indicated by the graph. The linear boost response of the centrifugal design meant that the boost pressure started at just 1.7 psi at 2,500 rpm. This compares to the 10 psi supplied by the Eaton at the same engine speed. Naturally 10 psi is going to produce more power than 1.7 psi, regardless of the difference in efficiencies. Down at 2,600 rpm, the Eaton topped the Vortech by 170 lb-ft. Had we provided just peak numbers and not complete graphs, you'd never know about the loss of low-speed power.
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