Precision Turbo and Engine BigStuff3 GEN3 Powertrain Controller Ignition Setup Tutorial - Manual (Page 23)

In order to avoid this problem BigStuff3 recommends using a system that has four magnets (for a V8)
embedded in the trigger wheel. As the magnets pass by a stationary non-magnetic pickup a sine wave
is created, which is used to trigger the ignition. The magnet-in-the-wheel design produces a more
accurate trigger signal and will not create a false trigger, like magnetic pickups have to potential to do.
MSD’s “Flying Magnet Crank Trigger” system is an example of a magnet-in-wheel design, preferred
by BigStuff3.
Embedded
magnets
The MSD Flying Magnet wheel and sensor assembly has a two-piece mounting bracket, used to secure
the non-magnetic pickup that in most cases will work on either the passenger side or driver's side of the
engine. The aluminum bracket is slotted to provide a wide range of timing adjustability to ensure the
assembly can be set at between 45
o
– 50
o
BTDC (without further modifications).
Note: It is important that the pickup being used is compatible with crank wheel. If the crank wheel has
non-magnetic studs, a magnetic pickup needs to be used. If the crank wheel has magnets, a non-
magnetic pickup needs to be used. Do not use a magnetic sensor with a crank wheel that has magnets!
Also, do not use a non-magnetic pickup with a crank wheel that has steel (ferrous metal) studs! Lastly,
make sure the arrows on the crank trigger wheel are going on the correct direction!
Crank Trigger Set-up
The easiest way to mount the bracket and non-magnetic pick-up assembly is to rotate the crankshaft
clockwise until Top Dead Center (TDC) number 1 cylinder compression is determined. Next, rotate
the engine back the number of degrees (BTDC) equal to the maximum timing advance the engine will
run at, plus 5
o
. For example, rotate the engine back 45
o
(max timing advance of engine), plus 5
o
or 50
o
Before Top Dead Center (BTDC), number 1 cylinder compression. Next, mount the wheel, bracket
and sensor assembly so that the crank wheel magnet and sensor are aligned or in phase. The air gap
between the sensor tip and face of the crank wheel should be between .050” - .075”. The crank trigger
2 wire connector must be changed to the 2 way black male Metripack connector (included in IPU kits).
Crimp the seals and female terminals on with the correct crimping tool. Use Packard crimper, PN
12014254 or MSD’s Pro-Crimp Tool, PN 35051, with Weathertight Dies, PN 3509.
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