The IGN1A Smart Coil by AMP EFI requires no CDI Ignition Module to produce 103 mJ per spark, with a longer spark duration (2.9 ms) than what you’d see with a capacitive discharge. They are the same monster coils used in Street Outlaws No Prep Kings contender, The Hulk!
Each IGN1A Smart Coil features a 19 amp IGBT ignitor built in and can be driven with a 5 volt logic level output – an MS3X or MS3Pro will run them directly (set spark output to going high), and we recommend a 270 to 330 ohm pullup if you’re building a MegaSquirt 1 or MegaSquirt 2 to drive them and can fully charge with as low as 2.5 ms of dwell.
Normally, you’d use them for a distributorless ignition as a coil per plug application, however they can be fired sequentially or every crank revolution (wasted spark coil per plug). If used as a single coil with a distributor, you may need to run a bit less dwell to prevent heat buildup from being an issue.
Maximum recommended duty cycle is 40 percent. Requires HEI-type plug wire ends/ boots. Plugs are sold separately. We offer either a 4 foot long flying lead pigtail or a pin and connector kit.
Here is the connector pinout:
- A – Ignition signal from ECU
- B – Logic ground, connect to ECU ground
- C – Spark wire ground, connect to cylinder head
- D – Power ground, connect to battery negative
- E – 12 volt power
The coil dwell starts when a 5 volt signal is applied to pin A and the coil fires when the voltage drops to zero. The signal is similar to an LSx coil, although it does need a bit more current to trigger.
Smart Coil specs:
- Minimum Output Voltage (no load, at recommended dwell): 40,000 volts
- Maximum Output Voltage: up to 81,000 volts (+/- 10 percent)
- Output energy: 103 mJ
- Spark duration: 2.9 ms
- Primary resistance: 0.5 ohms (not directly measurable)
- Primary inductance: 4.8 mH (not directly measurable)
- Secondary resistance: 8,500 ohms
- Secondary inductance: 22.5 H
- Turns ratio: 71.1
- Maximum current: 19 amps
- Maximum battery voltage: 17 volts
- Nominal dwell: 3.0 ms
Excessive dwell or duty cycle may cause meltdown. As with any race coil, the manufacturer does not provide a warranty.