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Max boost-who know’s? I can go down to a 3.65 pulley before the blower’s maxed out( NMRA Renegade spec 5.0 stepup 74000 rpm)
The reason your seeing boost is just what Cartek Max said. It’s just a little 347 with a big blower.
The blower flows 2000cfm compared to the 1400 that the D1 did. The bypass is struggling to get the air out-it has one Greddy Type R heavy spring ( 1-7/8 piston)-might have to add another one.
Another reason is the belt isn’t slipping either-I fabbed up some custom idlers to get max contact area on the belts."