Does the AiRSensors ECU control spark timing?
No. The AirSensors ECU and F.I.R.S.T. DECU only control the fuel delivery, and not spark timing. The spark timing can be controlled independently by most original and aftermarket distributor systems, including Points-types, Capacitive Discharge, HEI, MSD, etc. The green tach wire from the ECU should be connected to the negative (-) terminal of the coil, if a conventional points-type distributor or coil is used, or to the (Tach) terminal on an HEI- type. The wiring harness includes an imbedded resistor in the green tach lead, (4700 ohm for analog system, 8200 ohm for the digital system) which should be present for correct operation. When using an MSD-type system the resistor in series with the green tach wire inside the harness must be removed, and the wire lengthened and insulated if necessary. Connect the green wire to the (Tach) terminal on the MSD ignition box.
Related Questions
- In the past there have been documented issues with the Delphi Ion Sensing spark control retarding timing inadvertently and degrading power. Does this exist with the Precision system?
- How do we calculate the ignition timing maps that are uploaded into a customer’s ECU?
- How does our system control ignition timing verses competitive systems?
