Hi all,

Just changed my turbine housing to a ar.48 from a .63. I was wondering what determines when boost starts to come in?
Is it solely the size of turbo - compressor/turbine sizing/housing ? or has the mapping/ecu etc play a part?
I no longer use the Amal valve and have a duel port actuator with a pressure adjuster feeding the back of actuator, I beleive this helps to run higer boost by applying pressure therefore stopping the wastegate opening?
It just seems to me that boost starts coming on a bit late, if the presure is not set correctly via presure regulator ajustment that keeps wastegate closed is it possible I am getting premature opening of wastegate causing boost to come in later than it normally would?



Thanks for any info-knowledge.

Tim.