msd 7al-3 operating voltage
#1
Junior Member
APPRENTICE
Thread Starter
Join Date: May 2005
Posts: 24
msd 7al-3 operating voltage
I’ve heard that the msd 7al-3 may run erratic at lower than 12 volts and should be run with as much as 18 volts is this true? Also I’m assuming that you would have the 18 volts coming in from the ignition switch if this is not correct inform me how it should be connected.
#4
Senior Member
RACING JUNKIE
Join Date: May 2003
Location: Coldwater, MI
Posts: 2,998
Re: MSD IGNITION
Originally Posted by showbusiness
CAN ANY ONE HELP WITH THIS , WHEN DO YOU NEED TO CHANGE FROM A 6AL SYSTEM TO THE 7 , WHAT ARE THE BENEFITS..MUD DRAG RACING WITH NATURAL ASSPIRATED SBC , NO BOTTLE...
I've ran the 6al on my bigger inch bbc with alky on them with no issues at all. The only reason I even switched to the 7al3 is everything is built in for the chips. If what you have is working dont change it. Inscreased spark is what you'll get. IMO if you want to change go digital 7530T
#5
Re: msd 7al-3 operating voltage
Originally Posted by mojomal
I’ve heard that the msd 7al-3 may run erratic at lower than 12 volts and should be run with as much as 18 volts is this true? Also I’m assuming that you would have the 18 volts coming in from the ignition switch if this is not correct inform me how it should be connected.
#6
Senior Member
MASTER BUILDER
Join Date: Oct 2003
Posts: 144
Our cars with less than 12.3 volts runs irratic.
It all depends on your compression and fire needs.
A blown engine under high boost requires much more spark energy that a normally aspirated engine.
The differences on the MSD stuff is more capacitence, the better the ignition the more fire , pretty simple.
It all depends on your compression and fire needs.
A blown engine under high boost requires much more spark energy that a normally aspirated engine.
The differences on the MSD stuff is more capacitence, the better the ignition the more fire , pretty simple.