ok, the EM1, EK4 and delsol all share the same engine, b16a2 right ?
and they weigh:

EM1 = 1114kg
delsol = 1114kg
EK4 = 1131kg

the power:weight ratio should be the same on both EM1 and delsol, and slightly worse on the EK4..

then why do people call delsols, delslows, when logically, they're faster than EK4s ?