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  #31 (permalink)  
Old 12-20-2011, 09:07 AM
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Quote:
Originally Posted by jseabolt
I thought an MSD ignition system replaced the factory control module. I mean the box is big enough to run an aftermarket fuel injection system as well as the ignition. What would be the reason behind running an MSD control box in conjunction with an HEI, Duraspark, Bosch, etc. control module?
All the MSD does is intercept the signal from the distributor to the coil and amplify it. It causes a multiple-spark-discharge(msd) so that the plug fires several times milliseconds apart. This is only done in lower RPM range where there is enough delay in crank degrees for it to happen.

With the BTM feature, it not only intercepts, it delays the signal as boost comes up. This is done in a smooth, linear curve based on the retard-per-lb-boost knob mounted in the cab and is MUCH better than the pull-all-at-once setup you have now So, you can vary it from very little to alot depending on what the engine likes instead of being all in or all out.

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  #32 (permalink)  
Old 12-21-2011, 08:25 PM
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My instructions show removing the module. I'd prefer to take a reduntant part out. This is how I have my HEI set up. No issues so far.

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  #33 (permalink)  
Old 12-21-2011, 08:44 PM
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It has been about 10 years since I hooked one up with an HEI, but at that time I used the module and I think there are still instructions showing how, but that adapter harness is alot better for sure.
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Old 12-22-2011, 07:46 PM
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The deal (at least from '86-on) is to remove the 4-pin GM HEI module and replace it we/the cable/harness. It's the 5- and 7-pin GM HEI modules that are retained in the distributor as a necessary part of the system.
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