Your best performing piston according to GGDT?

[boyntonstu]

What was your highest flow coefficient valve you built?

If higher than 50% please describe it.

[c11man]

so do you want answers to the first or second question becuase they are completly different

[Technician1002]

QDV in the short fat chamber is well above 50%. GGDT won't model a 1:1 OD diameter to seat ratio valve. Using in barrel accelleration data, the valve models like a burst disk.

http://www.spudfiles.com/forums/ggdt-an ... 18090.html

Due to the way the trigger rod slides inside the piston, the piston is struck, so the initial opening is much faster than a regular piloted piston valve.