How to Boost IGN Coil Voltage

Stock ignition (IGN) coils produce an average of 18,000 volts. High-energy ignition coils (HEI) will produce upward of 25,000 volts. The voltage produced depends on the number of windings in the primary windings. Boosting voltage means replacing the coil with one with a higher voltage output. They are not expensive, but achieve noticeable results in fuel economy. The spark is hotter, but not longer in duration. The hottest technology, which always gives better results, is MSD (multiple spark distribution) or High Fire type ignitions. The MSD not only increases the voltage given off by the coil, but also gives off thousands of sparks over a longer duration. High Fire increases both voltage and duration. More power -- better gas mileage for both.

Things You'll Need

  • Set of sockets
  • Set of 7 mm spark plug wires
  • Purchase and install a set of 7 mm spark plug wires, which have less resistance and make better use of the available voltage than factory installed wires.

  • Buy a performance coil with increased energy. Unscrew the nuts on the terminals on the coil, then pull the wires off the studs. Pull the coil wire off the top of the coil. Remove the coil from the bracket. Install the new coil, then install the wires -- the ignition switch wire goes on the positive terminal and the wire from the distributor goes on the negative terminal on the coil. Plug in the coil wire to the distributor.

  • Install an MSD or other High Fire type system. They are easily hooked up to any vehicle with the supplied instructions. This is the "must have" for today's vehicles. They make a world of difference in fuel mileage and power. They also keep the plugs cleaner and give you a smoother idle with easier starting. An MSD 6, for instance, with a mildly improved coil, can put out a shower of sparks for a longer duration at 50,000 volts. It equates to a much higher percentage of fuel burned. The fuel savings, which varies from vehicle to vehicle, pays for the installation in short order.