What it is
ICE Ignition makes its own version of the LS1-style coil, sold as part number 4300. It's aimed at LS1 upgrades and at any EFI build that wants individual coils. It fits the factory LS1 mounting brackets, and the connector and wiring are the same as a normal LS1 coil. The one thing that's different, and the one that matters for your tune, is the dwell it needs.
ICE's own claims for the coil include:
- around twice the energy of the factory coil, when used with their supplied dwell table,
- a 20 A current limit, versus 8.25 A for the factory unit,
- a design built to handle vibration and keep output consistent, for road, off-road, race and marine use, and
- strong common-mode noise rejection to avoid false triggering.
Those are the manufacturer's figures, not ours, but they explain why the coil wants different charge times from a stock LS1 coil.
Wiring
Wire it exactly as you would a standard LS1 coil. Our LS1 ignition coil page has the pinout and notes. If you're swapping from stock coils, the existing harness plugs straight in. If you're building a harness from scratch, check the connector against the LS1 coil plug and pins kit before you order, and if you'd rather stay with a factory-style coil, Haltech sells an LS1 coil with built-in igniter.
Keep in mind that a coil with a higher current limit asks more of your power feed. Check that the supply wiring and relay can handle it, especially on a V8 with all eight coils sharing a circuit. See how relays work for the basics.
Haltech settings
| Haltech Elite setting | Value |
|---|---|
| Ignition Mode | Depends on your installation |
| Ignition Edge | Falling |
| Ignition Dwell Mode | Constant Charge |
Dwell
This is the setting you must change. Don't copy dwell values from a stock LS1 coil map or a base map. Use the dwell table meant for this coil, then confirm in your logs that spark is steady right through the rev range. Too little dwell costs spark energy; too much wastes power as heat in the coil. Haltech has a dwell chart for the ICE 4300. Need it? Ask us and we'll send it over with advice for your build.
If you're changing from factory LS1 coils on an existing tune, update the dwell table in the same session you fit the coils, and do a gentle test drive before any full-throttle runs.
FAQ
Will the ICE coil fit my stock LS1 brackets?
Yes, ICE designed it to use the factory LS1 mounting brackets.
Is this coil the same as an LS2 coil?
No. For the LS2/LS3 style coil, see our LS2 ignition coil guide. For more on how igniters work, read internal igniter or not.
