Nowadays it is hard to improve the ignition on late model cars. New car ignitions, especially ones with coil on plug systems are more powerful from the factory than racing ignitions of just a few years ago. In a few cases, we have made cars run worse by installing a high-performance ignition system because the factory parts were better. We’re upgrading our Project GD Subaru STI’s EJ256 motor with high-performance Ignition Projects – multi spark ignition coils, part number IP-A136401 . These high tech coils feature a high-power built-in spark amplifier, producing 4 times the spark energy and increased spark amperage of 100% over stock coils.
Ignition Projects Subaru coils are unique in that they not only have four times the spark energy of the stock coils but they also fire multiple times for each ignition event. In fact, they not only fire with four times the spark energy but they spark 10 times for each triggering event! That give the fuel-air mixture 10 chances to ignite vs only one via the stock ignition!
The Ignition Projects coils give this capability internally in the coil itself so there is no need for mounting and wiring any external magic boxes or alter the vehicles wiring in any way. The Ignition Projects coils are also designed to be low noise so, despite the extra power and multiple sparks, there will be no interference with other vehicle electronics and audio components. The first is critical with modern cars with many integrated digitally controlled parts.
The stock coils on a Subaru flat 4 are a little hard to get to as the EJ engine is wide and the engine compartment is tight.
A little creativity with 1/4″ drive ratchets and flex heads get to the bolt holding the coils in place.
While we were in there we changed the plugs. The factory double platinum electrode plugs looked pretty good, even with 80k miles on them.