could ignition breakup only over 7-9 psi be caused by a bad PFC? it happens on both trailing and leading and I am running 4 MSD coils with a 6A on my leadings, brand new wires and #9 plugs. could it possibly be a bad injector driver? my AFR is around 11 at break up and i shoot crazy flames.

 

Anything is posible but only a few are probably.
Think logically about this.

The PFC sends the timing pulses to the ignitor. I imagine: you use the ignitor leading output to drive your 6A which drives the two leading coils. How are the two other coils hooked up, directly to the two trailing outputs?

Since it works at lower boost levels, that means the PFC is OK. After all it is just a low voltage control signal from the PFC to the ignitor and on so down the chain.

The problem is at or after the ignitor. Start there and you will find your problem. I am betting that it is after the ignitor.

 

thanks for the input. i'm going to redo the wiring from the igniter to the coils and the 6A... and yes you guessed correct at how they are hooked up. it just seems strange that it is happening to all 4 plugs. I can shut off my 6A from the car and it runs the same with the 7psi breakup which made me think it wasn't working at all to begin with so I unplugged the trailing plugs and the car ran the same as well with breakup at the same PSI which led me to installing the extra grounds from each rotor housing and the igniter to the fender. I've gone through 3 different igniters and they all did the same thing. It's almost as if my coils aren't putting out enough voltage, but the leadings are hooked up to a 6A which puzzles me even further since they should have more than enough voltage. My next step is to change the connector on the igniter or re-pin it and hope that maybe it might fix something... is there a certain gage wire i should be using for the coils? maybe i need a larger gage?

 

The ignitor is made to be use with inductance coils. You can tell because it is not a CD unit. It is just a simple 12VDC swithcing unit which acts like a points system.
If your trailing coils are not inductance type coils but were designed foer CD use, they will not properly work.

Inductance coils give a spark when the leading coil collapses due to the voltage being turned of. CD coils fire when power is first applied.

 

I'm running MSD Blaster SS coils... MSD says they are inductance type but the igniter may not support them?? as far as i know many people run these coils off of the igniter with no problem