Does any one know the stock twins flow rate (pounds per minute)? I am currently running a To4e 57 trim .84 a/r p wheel and have found the rwh on the dyno is simular at low boost (11-12psi).

 

a to4e 57 will make 37 lbs/min at 1.8 pressure ratio or 11.5 psi.

3.7 X 144.71/1.92= 278 rwhp

obviously the stock twins have made more rwhp than 278.... typically around 350 at one bar plus. by inference the stock twins make around 46 lbs/min tops. at that level they are hugely heating the intake air and are extremely close to cavitation.

much more boost than the 46 lbs and you will probably get less oxygen and power from the twins. not so w the 57 trim

howard coleman

 

Very close to my dyno numbers, 273 rwh, 235 torque. Even though the motor is stock and I was running a Dynatech metal cat (also M2 Med IC, Aquamist water injection) I thought the dyno #'s would have been higher. How did you come up with that formula??