-Joel-
Boost drop off with the RB's is due to a crappy EBC that will not self adjust the duty cycle to achieve the desired pressure OR a the use of a bleeder.
Sydneykid
Sorry Iopia, can you please explain this? It has been my experience that once the wastegate is fully open (target boost has been reached) the spring in the actuator does nothing. Any boost drop off has been atributable to other factors (too small a turbo, poor flowing cylinder head, restrictive exhaust, etc). I need helsp understanding how the wastegate actuator spring preload helps this
Ill try to explainas best i can I am in no way an expert and only reporting my own personal findings.
Firstly joel R32's dont have An EBC like 33's and i Have never used a bleeder, having tried the bending etc of a stock actuator i still found the HKS replacement easier to set/adjust and it works better.
The stronger spring helps more with quicker boost build up. As wastgate actuator dont just snap open once a set PSi is reached they open slowly up to 100% at the said PSI. In say a r32 which has a 9psi rating the wastgate will start opening around 6psi more so since r32's are getting on a bit now. The stronger spring helps over come this problem it still starts opening but it needs more pressure to do it.
As wrxhoon said the stronger spring helps keep the wastegate open when you get higher revs
Using the HKS Actuator I found both quicker build up of boost and steady boost till redline hope this helps guys