Originally Posted by Utah S2K

The car will not exced 6,400 Rpm when "cold" (AP1). Many peeps use 3 bars of temp, again AP1, as a reference to when your good to go. Someone can give the AP2 bar rule as I don't know it off the top of my head. In reality the temp relates to oil viscosity. The cut off is actually regulated by fluid pressure to the V-TEC solenoid which is affected by temperature. Cold fluid is thicker and does not provide enough pressure. Utah