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Old 10-10-2012, 07:33 AM   #835
Scooby Guru
Member#: 46135
Join Date: Oct 2003
Chapter/Region: Tri-State
Location: NY
02 WRXstiV9 Spec C


Thanks, Shaun.

I was thinking more in terms of how wide the wastegate door swings and still have propper preload.
By example, the non adjustable actuator that comes with the VF37-36 only swings the door open at less than 45 degrees. On an adjustable actuator, that rod length is equivalent to 3+ turns.
For that 8sq cm housing and running the OEM 19.5 PSI, that is fine.

Once you run a 10 sq cm and aim for 22 PSI, achieving the needed preload with just 1.5 turns leaves the door swinging open at 45+ degrees.
With an 18 PSI, you may have the preload at 0.5 turns and open the door at above 50 degrees, at full actuator pressure.
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