So this is a help me understand thread. I’ve ran a blower for a couple years now and really enjoy learning more and understanding how my equipment works. Trying to wrap my mind around blower CFM first. The way I understand is CFM should be dictated by rotor length (cubic inch/ Revolution = rotor length 31.53 for HH). So for a 14-71 looking at about 520 c.i. Or .300 cubic feet per revolution. Talking with another racer friend and he said he has an older 14-71 high helix (delta bottom opening) and said it can’t keep up even close with newer models, only about 4300 cfm. Doing my math on his car at 27% over and 8000 rpm He’s only using/getting 3048 cfm on his 14-71. So assuming he doesnt intend to go more than 33% over doesn’t want to turn his motor any faster is a “modern” blower going to do him any Good? It makes sense I guess for the TA racers that turn 13k rpm plus and getting really high boost but is there any benefit to the T/D racer turning 8k rpm and looking at 24-28 pounds of boost. Since most of the 14-71 blowers have the same length, delta bottom, similar top opening sizes, 120* rotor twist , and inner/outer strips what separates the premium blowers from the others (boost, cfm,?). Initially I thought that maybe it would get its boost earlier but once I started running my blower I found that my boost stayed very flat through my whole run from 3800 rpm - 7700 rpm. Now I’m currently only running 16-18 lbs of boost, does the higher boost range not the same between high end and regular HH blowers? Thanks for the formation, really enjoy coming here and expanding my knowledge of these things!