Holley EFI 556-160 Holley Coyote Smart Coil User Manual
- June 3, 2024
- Holley EFI
Table of Contents
Holley EFI 556-160 Holley Coyote Smart Coil
This coil is designed for use with Holley® HP and Dominator ECU’s, as well other EFI systems that can drive “smart” ignition coils. Although it is designed for high powered race applications, it can be used on street driven vehicles as well.
Specifications
Peak Voltage – 50,000 Volts
Peak Output – 172 mJ
Maximum Battery Voltage – 20.0 Volts
Mating Connector – Delphi P/N 12162825 “Pull to Seat”
Connector Pin – Delphi P/N 12124075 “Pull to Seat”
NOTE
The wire must be fed through the back of the housing, out the front, and then the pincrimped. Pull the wire back in to seat it.
Wiring
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Pin A – Coil Trigger. Connect to individual ECU EST Outputs. EST A should go to cylinder #1, EST B to cylinder #2, etc. Any gauge wire is acceptable. A 5V signal triggers this coil.
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Pin B – Coil Trigger Ground. These can all be tied together and go to Pin B14 (EST Ground Output). Any gauge wire is acceptable.
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Pin C – Ground to Cylinder Head. This ground MUST go to the cylinder head that the coil is discharging to. It is recommended to tie each cylinder bank together. Do NOT connect any other grounds to this point. This MUST be the only ground in this location. It is recommended
to use an 18-20 gauge wire for each coil, and then tie them to a single 10-12 gauge wire. -
Pin D – Battery Ground. This high current ground should go to the battery or to a ground stud that is directly connected to the battery. Don’t ground on sheet metal, etc. It is recommended to use 18-20 gauge wire, and then tie to a single 10-12 gauge wire.
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Pin E – High current switched +12V Power. Do NOT connect directly to the battery. It is recommended to install to a 40A relay source. Use 18-20 gauge wire for each coil, and thentie to a single 10-12 gauge wire.
Graphs showing energy output vs. dwell for 12V and 16V batteries are shown on the next page.
NOTE: They assume use of an alternator and are shown for 14V and 18V accordingly.
Holley EFI ECU recommended dwell: Use the 14V graph below when referencing
dwell settings for Holley EFI products. Holley ECU’s have a background battery
voltage compensation for ignition dwell. It is based off a nominal 13.8/14.0
volts and adds/reduces dwell for voltages above and
below. Use a maximum of 5.5 milliseconds for full coil output and lower levels
under idle/cruise conditions (when using a dwell table).
On 12 Volt systems, the optimal dwell setting is 5.5 milliseconds for peak power.
On 16 Volt systems, the optimal dwell setting is 4.0 milliseconds for peak power.
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