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Join Date: Nov 2004
Posts: 5
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MSD HI-Vibration coil and Ballast resistor?
Hey again!
I just got my MSD "HI-Vibration" and MSD ballast resistor today! I have a stock ignition system in the 1975 911. I wanted to know if I need to use the MSD ballast resistor with the new MSD Hi-Vibration coil? Or do I just swap out the old leaking Bosch coil with MSD coil w/o ballast resistor? I see in previous posts that some people use ballast resistor and some don't use them. Thanks, Rpettway 
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1975 Porsche 911 "We screw, We Nut, We Bolt!" |
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11-18-2004, 02:56 PM
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Location: Linn County, Oregon
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The way I understood a previous post by Warren, the coil alone is compatable with the Bosch CD ingition unit...
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11-18-2004, 03:15 PM
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Location: Peoples Republic of Long Beach, NY
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I just read the MSD papers. The ballast resistor is for current triggered tachs which we don't have. Or engine run-on which you don't have. You have stock ignition which means you have a Bosch or permatune CDI.
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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11-18-2004, 03:35 PM
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Oh I was told that the resistor is to reduce the voltage to extend point life.
Mike
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1972 911T Targa 1994 Volvo 850 Wagon 1988 BMW 635 CSi |
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11-18-2004, 03:40 PM
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Quote:
you should have stock Bosch or Permatune CD box on your drivers side engine compartment electric panel.. make sure you have this unit installed..
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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11-18-2004, 03:55 PM
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ohhh.. I scrambled who asked the question I answered.. maybe a '72 didn't have a CD.. maybe it has the old induction coil ignition? If so then a resistor is needed.
so sorry
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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11-18-2004, 03:58 PM
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Location: Linn County, Oregon
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Ron...'72 is Bosch CD...
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11-18-2004, 06:32 PM
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Location: Peoples Republic of Long Beach, NY
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Quote:
"so sorry" ..I take that back 
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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11-18-2004, 07:58 PM
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