fastzcars Posted September 28, 2007 Share Posted September 28, 2007 I tried googling but I couldn't find any info.Does anyone know where I can get a electronics schematic of a MSD a6 box? I opened my old A6 box because MSD tech sent it back and said it was not repairable? I can see some resisters and a capactor blown. I know I can fix it, but the color bars on the resisters are blown out. I need a component layout and or a schematic to know the values needed for my repair. I hope you guys can help. Quote Link to comment Share on other sites More sharing options...
fastzcars Posted September 29, 2007 Author Share Posted September 29, 2007 Boy! I was up late last night looking for any info> I didn't realize that the inside of these box's are are such a secret? I only info I could find that was remotely useful was a patent website! I guess I'm on my own on this? Quote Link to comment Share on other sites More sharing options...
jeffp Posted October 6, 2007 Share Posted October 6, 2007 You are not alone on the schematic, I just happen to have one. I had the box backwards engineered when I started into all of my changes and modifications. I paid to have the schematic made and sent to me. After examining the unit, my recommendation is to dump it! the box does little for the engine performance, and since I am at about 600hp andthe box is falling down I now have to change it out again. I was able to make mods to the circuits to increase the dwell duty cycle of the output. I went a little to far with the pulse width as it starts to misfire at 6800 rpms. A simple cap change to a .1 from a .047 did the trick. The thing is this: The output is being triggered by a .1 micro farad cap to give the box the quick response. This is good, but the problem is the spark duration gets chopped to about 508 micro seconds, or about a 1/2 milli second. This is not a problem with a N/A engine, but you start running into trouble with a high boosted engiine in the 600hp range there just is not enough spark duration from all of my testing. I have been working on this one for some time along with the Z31 ECU modifications. If you want the schematic let me know I can make a PDF of it and send it to you. REGARDS: Jeff Quote Link to comment Share on other sites More sharing options...
fastzcars Posted October 10, 2007 Author Share Posted October 10, 2007 GREAT!!! Thanks for the offer for the schematic! PM sent. :-D:-D Quote Link to comment Share on other sites More sharing options...
beau_dirt Posted July 21, 2018 Share Posted July 21, 2018 Jeffp, would I be able to get a copy of that schematic? Thanks, Quote Link to comment Share on other sites More sharing options...
NewZed Posted July 21, 2018 Share Posted July 21, 2018 Necroposting to a Level 10 Necroposter. Apropos. Maybe the @ thing will work @jeffp Quote Link to comment Share on other sites More sharing options...
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