Cam Sync Refrence Angle Setup
Holley EFI Setup Helper
Find the target cam sensor trigger position before TDC on cylinder #1's compression stroke.
2. Enter your setup
Use the exact Ignition Reference Angle shown under Crank Sensor Setup in the Holley software.
Compression stroke only. The cam pulse must occur before cylinder #1 reaches TDC on its compression stroke—not its exhaust stroke.
Recommended trigger position
Acceptable window (±30°)
Acceptable range
165.0°–225.0°
BTDC #1
Allowed variation
±30°
from ideal
60 + 90.0 + (90.0 ÷ 2) = 195.0°
Angle between crank pulses (A): 90.0°
Based on Holley's crank/cam sensor installation guidance. If the trigger cannot be installed within this range, or your setup falls outside these assumptions, contact Holley Tech Service before changing firing order or wiring.