Precision Turbo and Engine BigStuff3 GEN3 Powertrain Controller Ignition Setup Tutorial - Manual (Page 5)

4
Type 2 - Modified distributor (to serve as the cam sync) to be used with a crank trigger
setup
The cam sync drive provides a signal (every 360
o
of cam rotation) that allows for cylinder “fuel-
phasing” (controlling the point, BTDC, when the fuel is injected into the cylinder) and individual
cylinder “timing control”.
The cam sync signal, references the start of an injection or ignition firing sequence, and needs to occur
10
o
- 20
o
before the crank signal. The cam sync signal informs the ECU of the position of the number 1
cylinder. After the cam sync signal, the next input received by the ECU is the crank signal from the
crank trigger.
Quick Setup Guide
• If applicable, lock out the centrifugal advance. See
Locking_Out_the_Cent_Advance on page
3.
• Find TDC, cylinder number one (1), compression stroke. See
Find_TDC on page 20.
• Roll the engine back to 50 o
BTDC. See Measuring_Distances_on_the_Dampener on page 20.
• Install the crank trigger. Line up the sensor with the magnet. make sure the arrows on the
crank trigger wheel are going on the correct direction! See Crank_Trigger_Considerations on
page 21.
• Connect the crank trigger green wire to the BigStuff3 red wire. Connect the other crank trigger
wire to BigStuff3 black wire.
• Roll the engine back to 70 o
BTDC cylinder number 1 compression
• Install the distributor and make sure it is fully seated by “bumping” the starter until it engages
the oil pump drive while applying a light downward pressure.
• Line up the reluctor that is closest to the pole piece and mark it with permanent marker.
Remove the seven other reluctors. See Removing_Reluctors on page 6.
• Re-install the modified distributor, making sure the remaining reluctor is aligned with pole
piece.
• Tighten down the distributor
• Roll the engine back to the position BTDC (cylinder 1) equal to the ignition timing the engine
will see at maximum power.
• Phase the rotor and/or reluctor. See
Rotor_Phasing & Reluctor_Repositioning on page 23.
• Connect the
red BigStuff3 wire to the violet /black striped MSD distributor wire. Connect
other Distributor wire to BigStuff3 black wire. See Type_2_Electrical_Connections on page 6.
• Connect the BigStuff3 points wire (white) to the MSD ignition box points input.
• In the BigComm Software (Operating Configuration), set the crank reference setting to 50. See
Setting_The_Crank_Reference on page 25.
• Start the engine.
• Use the “CamCrkAdv” window in the Dash to adjust the cam sync to 15 o
- 20
o
. This is the
number of crank shaft degrees that the cam sync pulse occurs before the crank pulse. Loosen
and adjust the cam sync (modified distributor) until the cam sync occurs at least 15
o
- 20
o
before
the crank. Re-tighten the cam sync (modified distributor). See CamCrkAdv on page 27.
• Lastly, with the engine still running verify that the BigStuff3 “Dash” timing advance value
equals the timing value seen (with a timing light) at the crank. Change the crank reference