AMP EFI MS3Pro - BMW Inline Sixes; Buick C3 I; Chevrolet LS2, LS3 and Other GM 58 X V8 S; Example Wheel Decoder Settings

5.3 Ignition settings 5 SETTING UP A BASIC CONFIGURATION
5.3.4.16 Example wheel decoder settings Here are settings from engines that use the Toothed Wheel mode.
You will want to confirm these with a timing light, as trigger wheel tolerances will vary. Some of these are quite
specific, while others are general starting points.
BMW inline sixes These engines typically use a 60-2 crank trigger starting with the Motronic 1.1 systems in
the mid to late ’80s, with later models adding a one tooth cam sensor. Most use a tooth #1 angle in the 90 to 100
degree range (450 to 460 degrees with certain cam sensor versions), but there are a few exceptions. Check with
a timing light to be sure.
Note that models with a VR sensor typically need a 10K resistor between the CKP+ and CKP- wires.
Buick C3I The Grand National (and the later front wheel drive 3800) used a distributorless ignition with a
module that partially decoded the trigger wheel. Although there is an 18 tooth wheel on the crank, it connects to
the factory ignition module. The MS3Pro will use the 6X signal from the ignition module plus the 1X cam signal for
timing control and sequential injection. You will use spark output A for the EST signal and spark output B for the
Bypass signal. This includes the complete ignition module settings as well as the wheel decoder settings.
• HEI / GMDIS, TFI, C3I Options: Buick C3I
• Ignition input capture: Rising Edge
• Spark output: Going High
• Number of coils: Single Coil
• Trigger wheel arrangement: Dual wheel
• Trigger wheel teeth: 3
• Tooth #1 angle: 70
• Main wheel speed: Crank wheel
• Second trigger active on: Rising Edge
• And every rotation of: Cam
• Dwell type: Standard dwell
• Nominal dwell: 3.0 (adjust as needed to match coils)
Chevrolet LS2, LS3 and other GM 58X V8s These use a 60-2 crank trigger with a 4 tooth cam wheel. The
sensors run at 5 volts and use a 1K pull up resistor.
• Ignition input capture: Rising Edge
• Trigger wheel arrangement: Dual wheel with missing teeth
• Trigger wheel teeth: 60
• Missing teeth: 2
• Tooth #1 angle: 70
• Main wheel speed: Crank wheel
• Second trigger active on: Poll Level
• Level for phase 1: High
• Check at tooth #: 1
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 84