Ford Modular Motor Forced Induction Dyno Comparison - Boost Bash Part 1
Eaton vs. HP Performance Twin Turbo (11 psi)
Compared to the Eaton, the twin-turbo kit from HP Performance offered both more and less power. Down at 2,500 rpm, the immediate boost response of the Roots blower was the winner hands down. With an additional 100 lb-ft, the Roots blower would provide an immediate shove in the back, but, unfortunately, that shove would be short-lived-at least compared to the one supplied by the turbo combination. From 2,500 rpm to 3,500 rpm, the Roots blower out-boosted the turbos, but at 3,600 rpm, the power curves shifted in favor of the turbos. The improved efficiency combined with the torque producing nature of the long-runner '01 intake allowed the turbo system to produce an extra 178 hp and 154 lb-ft of torque. Once you past 3,600 rpm, replacing the Eaton with the turbos made as much power as adding some form of forced induction on a normally aspirated motor. Why such a dramatic difference in power at the same boost level? The power differences between the Roots blower and the turbos can be attributed to several factors. Much of the difference can be attributed to the power required to mechanically drive the supercharger. The difference in intake runner length of the intake had a noticeable effect on the power curve as well. The final factor is that the turbos are much more efficient at processing air (especially at pressure) than the supercharger. Combining all these factors will give you the difference between the blower and the turbos. View Related Article
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