CLASS RACER FORUM - View Single Post - msd7al-3 problem

OhioMafiaWireGuy · 12-23-2015, 10:54 AM

This is becoming problem we see more and more. When a car comes into our shop, that I cant start for any reason, I tape a note to the switch panel reminding the owner they have to check the timing and then reverse the polarity and check it again.

MSD has even published an Appendix stating the same. The rule of thumb is this: Check the timing and then reverse the wires and check it again. For Analog ignition boxes you want the mag pick up wiring that gives you the most retard. For Digital boxes you want the most advance. Leave the polarity that yields one of those for that given type of box.

On a dyno, I have seen this be worth 96 Hp on my personal motor.

In regards to the 7AL3's... ensure the box is grounded directly to the battery! Ensure all the 0 chips are installed! AND...ground the unused step retards.

12-23-2015, 10:54 AM	#20
OhioMafiaWireGuy Junior Member Join Date: Dec 2015 Posts: 1 Likes: 0 Liked 0 Times in 0 Posts	Re: msd7al-3 problem This is becoming problem we see more and more. When a car comes into our shop, that I cant start for any reason, I tape a note to the switch panel reminding the owner they have to check the timing and then reverse the polarity and check it again. MSD has even published an Appendix stating the same. The rule of thumb is this: Check the timing and then reverse the wires and check it again. For Analog ignition boxes you want the mag pick up wiring that gives you the most retard. For Digital boxes you want the most advance. Leave the polarity that yields one of those for that given type of box. On a dyno, I have seen this be worth 96 Hp on my personal motor. In regards to the 7AL3's... ensure the box is grounded directly to the battery! Ensure all the 0 chips are installed! AND...ground the unused step retards.