Has anyone run 24vdc to their MSD? The cd system will put out more volts with higher input voltage according to the paper work, says 24vdc max input, just curious if anyone had tried this and seen an improvement, I also have seen a step up box that someone is making has anyone tried it?

Do you really need than much output voltage? I use to widen the spark plug gap to make the coil voltage go up, the car didn't really need the higher voltage as it wasn't really straining the ignition system with the gap at .060 on a MSD 7A with the MSD coil let alone at .090 gap i run .045 now with the new type resistor wires required on the newer(old?) MSD race boxes like the 7AL2 and the newest digital boxes

We gap @ .035 so as far far as I can see we have not had any problems unless input voltage drops below 12.3 than every thing gets fuzzy , we input @ 16.75 and drop to 14.5 by the end of the day with no charging system, this morning one of my mud buddies was jumping his 2 12vdc batts in series to 24vdc for his new kick azz 24 volt starter, He said lots of guys are going to 24 volt systems on the 700+ cube engines so he was gona try it on his 632? He also said guys were seeing a little improvement in ET I saw no difference from 12 to 16 vdc so I thought I would throw this one up here and see

What I don't understand is why MSD can't design them to work on say, 11.5-15V--you know, "normal" voltage.

Installed one of Speedway Motors step up boxes. Puts 17 volts into MSD from 12v. Ran car at 1/8mi and 114.29mph. Bad track 1.39 60s. Plugs never looked so good. Motor happy.

I think if you were below mid 12 volts you will see a major gain, but I was trying to figure out if jumping up the volts on a system that seems to work well will benefit with higher volts, I guess I may have to load the system up more by increasing plug gap to see if the higher volts works better

Yeah....trying gap at .045 from .040. Seems to like it, shift at 7400. 1 12v batt and Shogun alt. Checked coil spark and noticeable diff in spark. MSD 7al 2.