There’s a few videos with the amr 300 / 500.
Red beard has one. He made more boost than I expected with his pulley set up on a 440cc.
I probably did some math at the time and did not expect 15lb on a 440 with a 300cc blowet
I don’t remember his pulley ratio but I expected 1:1 ratio with 300cc blower on 440cc 4stroke about 5 psi of boost.
440 cc / 2 crank rev
220 cc / 1 crank rev
300 cc / 1 blower rev
300 / 220 = 1.36
1.36 * 14.7 psi = 20 psi (absolute)
20-14.7 = 5.3 psi of boost
perhaps intake temps became high, increasing pressure.
Pressure x Volume
is proportional to
(#of of molecules) x (Temperature)
Pressure can increase by increasing temps without stuffing any more air in a fixed volume.
Hotter Air instead of dense air, I propose, will give a higher boost reading with worse performance.
Robot Cantina has used one or two.