Danno

You do need the ballast resistor becasue the specs for the DME is 1.2-1.6 ohms. The Blaster coil is 0.7-0.8ohms and would draw twice as much current from your DME's driver transistor as the stock coil. Someone had a Blaster coil and was having constant overheating problems and cut-outs. Installing the ballast cured his car of that issue.

WIth inductive coils, what happens is that the battery-voltage going to the coil drops due to the draw from the starter. It's not unusual to see voltage in the 9-10v range when cranking. So a higher-voltage coil will give you higher-than-stock voltage when the battery is under stress. This higher-voltage results in easier starting. High-RPM operation should be better too on high-HP cars. Typically around 360-370rwhp, you end up with issues on the spark getting blown out. Narrowing the gap down helps the spark jump across at a lower voltage, but you don't get as hot of spark.

awilson40

Per the Repair manuals. The Blaster 2 is rated only .1 ohm diff. And its Higher than the specs. I really doubt that it will cause the DME to overheat.

Gerald Allgire

I've had a Blaster coil installed for about 2 years now without a ballast resistor on my 1984 944. It has been trouble free. It did seem to eliminate a flat spot at about 3000 rpm. I had installed new wires and plugs before the coil and didn't notice any difference at all.

david fracolli

I ran the blaster 2 on both of my n/a's for over 3 years with no problem