DID any one know the different between 6A and 7A? I plan to put some IGN box on my 13B PP road race car. one of my friend told me MSD 6A will only work under 6K. how about 7a? I check the msd site, look like a lot of drag racer use 7a all the time ? I wonder will it work on road race car ??

 

I think the MSD 6A has a glitch at 8k if run in a direct fire arrangement with two coils hooked in parallel. I don't think it has a problem if used with a DIS coil.

I don't think it matters very much as to which type of racing a 7A is used for. It is not approved by the DOT for use on polution controlled vehicles, or something like that. Only the 6A and 5A are (I think).

 

mm... U got a very good idea of direct fire system. mabe I should put this system? may I ask u, is there any down side on this system.

ONE Q are there any way to upgrade ur ign systm? from what I know are put MSD BOX, direct fire. COMPLETE DIS system?
thanks for ur time
j

 

It depends on what you already have, and what you're willing to buy. It also depends on your electrical skill level to some extent.

Is your car older than '86?