Originally Posted by my94blackz

Drive it. When I installed mine I made 10-12 passes with a rachet long extention and swivill in the car with me. I drove it till it felt right. When I put mine on it bogged at low rpm, kinda a hesitation, so I turned it then it started busting out on top. After 10-12 runs it was perfect.

Originally Posted by shoebox

The only way to actually know what timing the MSD is giving the engine is to rig up a timing pointer, verify with a scanner the advance the computer is providing and then observe the advance on the pulley. That's a lot of trouble. Some have noted that the screw does not alway engage properly and that would definitely skew the intended amount of advance/retard. That is one of the things I don't like about the MSD.

Originally Posted by C_Rules

thanks blackz. my only problem is that i use tuner cats and really want the timing I command to be the true timing of the vehicle. if i use the opti screw i'd never know what my timing is.