Sr20det Coilpacks... How Do They Work?

[Guest PROJECTRB240SX]

I Ordered A Msd Dis-4 And Splitfire Dfi Coils... And I'm Trying To Map Out How I'm Going To Wire It All In. I Need To Know How The Nissan Coils Work.... Are They Constant Voltage (always On Power) With A Trigger Wire Or Are They Alternating Voltage (power On When Signal Fires) With A Signal? The Reason I Ask This Is Because The Coils Are A Three Wire Setup And Msd Says I Need To Tap Into The Power Side Of The Coils And Intercept The Signal (which Is Either A Dedicated Signal Wire Or The Negative Wire On The Coil).

 

Also Anyone With Experience Does Any One Know If I Need To Use The Splitfire Booster Along With The Msd Dis-4 Or Can I Elminate The Booster Pack And Use The Msd Dis-4 For The High Voltage Supply?

[cheftrd]

Wire the coils just how MSD shows. The coils are constant power. You can use that lead for the power to the DIS. The third wire from the coils is a ground which has nothing to do with the pos and neg from the DIS; this wire gets bolted to ground. If you still have the SR coil harness, you will see that all these wires terminate into a single loop for bolting to the engine (ground). All the coils get power from a single wire. That wire splits off after the igniter coupler and the #1 wire turns black. This wire is extra long with a loop for connecting an inductive timing light. Don't make it too short.