i tot i asked for a question but not an answer? :hmmmm::hmmmm:
also how does a mech know the cam duration / lift if without removing the cam?
so turbo is to retard? retard intake or exhaust? if retard, how come the turbo will spool quickly?

....sori me abit blur
if thier r specialize in engine modification then thier will know the factory spec ,if thier duno then i cant help or maybe thier r not expert in this kind ( dont let forman huh dunno how to set the cam if not its will easy to BLOW up ur engine easy coz the cam r the 2nd important thing in the engine if not tune or set it well )
for turbo is need to set retard at intake and then for exhaust is Advance and below here i got some info to let u guys know if who u duno anything abt cam setting :
Retard
* Delays intake event
* Open intake valve later
* Build more high-end power
* Increas piston-to-intake-valve clearence
* Decreas piston-to-exhaust-valve clearence
Retard is for ur cam timing to reduce low-end torque, increase upper RPM HP
Advance
* Begin intake event soone
* Open intake valve soone
* Build more low-end torque
* Decrease piston-to-intake-valve clearence
* Increase piston-to-exhaust-valve clearence
.Advance is for ur cam timing for increased low-end torque and acceleration.
so u ask how come the turbo can spool quickly ? after u set the cam timing then the open valve and closing valve timing is not same as factory coz it collect more comperssion or volume inside ,
