Can anyone explain the cam timing adjustment?
I read the IPD instructions but still confusing.
". Non turbo intake camshafts have 0.020 inch more lift and 7 degrees more camshaft duration. The non turbo intake cam also starts its opening 4 degrees sooner than the turbo camshafts. So if a non turbo intake camshaft were to be used in a turbocharged engine, and the same overlap were desired, then the intake cam would need to be retarded by 4 degrees from the factory base setting."
It adjust 4 degrees for intake however there is 7 degree more duration.
"Non turbo exhaust cam shafts have 0.014 inch more lift (total valve opening) and 3 degrees longer duration (total time the valve is open). The non turbo exhaust cams start opening 2 degrees later than the turbo cam shaft. So to maintain the same overlap, a non turbo exhaust cam in a turbocharged engine would need to be advanced 5 degrees from the factory base setting."
Here it adjust 5 degree which is 3 duration + 2 later open.
Why adjust the degree differently?
How to reset to factory settings?