5.3 Ignition settings 5 SETTING UP A BASIC CONFIGURATION
5.3.40 Flywheel tri-tach
Known applications include:
• Early 1980s Porsche 911
• Porsche 944 Turbo (951)
• 1986 and earlier BMW 325e
• E30 chassis BMW M3 with S14 motor
• Many 1980s and early 1990s Audis
This application uses a VR sensor that counts flywheel teeth, with a second flywheel sensor that reads a single
post and, in most implementations, a cam sensor. Note that the number of teeth is hard coded for a specific
number of cylinders. With a cam sensor, this will support full sequential. Current ones available include:
Number of teeth Number of cylinders
135 5
135 6
136 8
132 4
130 4
For wiring, connect the CKP wires to the flywheel tooth sensor, the reference (1 tooth) flywheel sensor to the
“cam” input, and the cam sensor to the pin selected as tertiary tach input. For most applications, the flywheel
sensors are both VR type with a Hall effect cam sensor, so you will use CMP for the reference sensor and Digital
Frequency In 2 for the cam sensor.
This mode is also considered experimental at this point.
5.3.41 2JZ VVTi
Used on the Lexus IS300 and many 2000 and later Toyota six cylinder engines with VVTi. This uses a 36-2 crank
trigger and a three tooth cam trigger, with VR sensors. Supports sequential injection and variable valve timing.
Because of the nature of the VR sensor, it can trigger off either edge, depending on the wiring. Ignition input
capture should be tried both ways and set to which one gives you the most stable signal.
This mode now also supports VVTi applications with a 36-2 crank trigger in four, eight, and twelve cylinder
variations. Twelve cylinder mode is considered experimental.
5.3.42 Honda TSX / D17
Uses a 12 tooth crank sensor with one tooth added for a total of 13 real teeth, combined with a cam sensor. This
allowed Honda to add continuously variable valve timing. Uses VR sensors.
5.3.43 Viper V10
Used for Vipers and V10 Rams with JTEC ECU. This one has a crank trigger with five groups of two teeth. A
cam sensor is also required, with a one tooth trigger wheel. Both are Hall effect and require pull ups. Supports
sequential injection, but as the MS3Pro has only eight ignition outputs, you will need to run wasted spark ignition.
Factory Chrysler coils require external ignition modules such as the QuadSpark. Gen 1 mode is used for the 1995
and earlier, which had three teeth on the cam trigger, while the others use regular Viper V10 mode and have a one
tooth cam trigger.
Chrysler ran these sensors on an 8 volt regulator. We have found they will work if supplied with 12 volts, but do
not give a reliable signal if connected to 5 volts.
5.3.44 Honda K24A2
This mode uses the same pattern as the TSX / D17 mode but with a different position for the added tooth on the
crank pulley.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 96
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