msd 7al-3 operating voltage

Old 04-26-2008, 07:31 PM
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mojomal
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Default 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.
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Old 04-26-2008, 09:48 PM
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hammertime
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Mine has 11.2 volts to the 7al3 no issues lots of myths with these boxes some truths but not all
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Old 04-27-2008, 03:46 AM
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showbusiness
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Default MSD IGNITION

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...
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Old 04-27-2008, 06:30 AM
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hammertime
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Default 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
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Old 04-27-2008, 08:59 AM
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jmarksdragster
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Default 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.
Run an alternator and you won't have any issues.
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Old 05-01-2008, 08:15 PM
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altune
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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.
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Old 05-02-2008, 08:59 PM
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mojomal
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thx for for all the info.
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