I've had a lot of experience with MSD on several supercharged Ford Mustang. With the MSD systems detonation was completely eliminated , the MSD can provide 20 degrees of continuous spark, so your basically running fire in the cylinder for 20 degrees, you're almost guaranteed ignition. It is much better to have a late control burned then they self ignited detonation.
Ever since this cheaper gas has hit market I've had to turn my boost down from 16 pounds to 12, before my Scanmaster shoes 0 retard.
I think I'm going to pick up the MSD set up, it looks like a wiring nightmare. But it cannot possibly be any worse than wiring and a Programmable 7, by MSD. I was also wondering will the factory Tack stay working with the MSD / DIS-4 HIGH ????
Plus with a simple pressure switch one can activate the timing retard at a predetermined amount of boost with the DIS-4 HIGH. I hate putting wiring in my engine compartment , but this seems to be the only way .
I was also wondering if anyone knows how many degrees of spark is provided by are factory ignition systems. if MSD will provide 20 deg, and this is better what is factory?