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06-30-2015, 04:30 AM
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CC Member
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Join Date: May 2012
Location: Blasdell,
NY
Cobra Make, Engine: Superformance, 408 Windsor
Posts: 125
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Not Ranked
MSD Digital 6AL pn 6425
I just replaced my old 6AL pn 6420. When I started up the Cobra after the winter this year, it was running real rough, decreased power, but not breaking up. Wouldn't want to take it out on the road. Tapped on the MSD box a few times and then it was running just fine. I replaced the box with a new Digital 6AL and now my Lucas ammeter fluctuates between 0 and +25A when the motor revs up. It's stable at idle. I'm guessing the new box is messing with the voltage regulator. A buddy said it's a known issue, but I couldn't find anything googling the issue. Just got the box in yesterday and will call MSD later this AM. Anyone heard of this?
__________________
Mike Glados
Blasdell, NY
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06-30-2015, 11:41 AM
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CC Member
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Join Date: May 2012
Location: Blasdell,
NY
Cobra Make, Engine: Superformance, 408 Windsor
Posts: 125
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Not Ranked
I called MSD this AM and they just said that box draws a lot of power, you're going to have to live with it. Well, looks like I'm going to have to look for another place to find a solution.
__________________
Mike Glados
Blasdell, NY
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03-23-2016, 08:47 AM
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CC Member
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Join Date: Mar 2010
Location: Williamsburg,
VA
Cobra Make, Engine: SPF #2920 w/ Keith Craft 408
Posts: 250
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Not Ranked
Mike,
Any solution?
A Superformance dealer just installed a new MSD 6AL ignition box in Superformance (KC 408). Installed for rev-limiter purposes.
Everything worked fine before switching boxes. After installing the new ignition box, the car runs “reasonably” well (maybe a touch rough), but the amp gage is now continually jumping, even at idle.
Not sure this is an issue…so my question to anyone is…does the continually jumping amp gage signify a problem?
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03-23-2016, 06:36 PM
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CC Member
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Join Date: Sep 2002
Cobra Make, Engine: SPF#0760
Posts: 3,407
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Not Ranked
Where did they pickup power for the MSD box?
__________________
Wiring Diagrams: SPF MKII, MKIII, GT40, CSX7000, CSX8000, Corvette Grand Sport, and Shelby Sebring, Bondurant & Cinema Tribute Cars.
Owner’s Manuals: SPF MKII, CSX7000, CSX8000, Sebring, Bondurant, Cinema Tribute Cars $ GT40’s..
Large, easy to read and trace schematics with part numbers, wire colors, wire gauge, fuses, and electrical upgrade information. Trouble-shooting and replacement part numbers for those roadside repair adventures.
SPFWiringDiagrams@Comcast.net
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03-23-2016, 07:29 PM
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Senior CC Premier Member
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Join Date: Nov 2004
Location: SoCal,
CA
Cobra Make, Engine: CSX #4xxx with CSX 482; David Kee Toploader
Posts: 3,574
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Not Ranked
Just another example of why I finally ripped out the entire MSD system and put in a Pertronix self-contained and rev-limited distributor! A nice polished billet piece. Problems solved (knocking on wood). 
__________________
All that's stopping you now Son, is blind-raging fear.......
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03-24-2016, 05:33 AM
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CC Member
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Join Date: Mar 2010
Location: Williamsburg,
VA
Cobra Make, Engine: SPF #2920 w/ Keith Craft 408
Posts: 250
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Not Ranked
It was a 5 hour job. Believe the Superformance dealer ran power pickup all the way back to the battery in the trunk.
Electricity is not my friend.
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07-13-2017, 02:14 PM
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CC Member
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Join Date: Feb 2012
Location: Keller,
TX
Cobra Make, Engine: Lonestar Classics LS427. Self-built 408W, AFR 195 heads, Performer RPM Intake, Quick Fuel 750, 407rwhp, 479rwtq
Posts: 549
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Not Ranked
I agree to check the wiring and install. Also, I don't know anything about the Superformance cars but...
Another (possibly quick fix) thing to try is to add a capacitor to the power lines to the MSD box. If it really is the new box's power demand, this should buffer the voltage spikes it is sending your electrical system.
MSD 8830
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