Precision Turbo and Engine BigStuff3 GEN3 Powertrain Controller Ignition Setup Tutorial - Manual (Page 17)

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Type 7 – MSD Mag44 (Magneto)
Quick Setup Guide
• Find TDC, cylinder number one (1), compression stroke. See
Find_TDC on page 20.
• Roll the engine back to 50 o
BTDC.
• Install the crank trigger. Line up the sensor with the magnet. See
Crank_Trigger_Considerations on page 21.
• Roll the engine forward to the position BTDC (cylinder 1) equal to the max power timing.
• Phase the rotor and/or reluctor.
• Connect the
red BigStuff3 wire to green crank trigger wire. Connect other crank trigger wire
to BigStuff3 black wire.
• Connect the BigStuff3 points wire (white) to the MSD Pro Mag
violet wire ignition box points
input.
• In the BigComm Software (Operating Configuration), set the crank reference setting to 50.
• The ignition timing during cranking must be set to 25
o
. Go into the spark map and make sure
all the cells used during engine cranking are set to 25
o
. The engine will start on the magneto.
The Pro Mag 44 requires about 250 RPM to fire during cranking. BigStuff3 takes over and
controls the spark timing above 1,000 rpm.
• Start the engine. See
Setting_The_Crank_Reference on page 25.
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 value in the Crank
Trigger window (in the Operating Configuration table), up or down, until the “Dash” value and the
crank value are the same. See
Dash_Window on page 29. The Pro Mag 44 requires about 250 RPM to
fire during cranking.
Type 8 – GM LS1/2/7 - Coil-On-Plug (COP)
Quick Setup Guide
• Find TDC, cylinder number one (1), compression stroke. See
Find_TDC on page 20.
• Input 350 o
into the COP Crank Reference input box (not the crank Trigger Crank Reference
box). See Setting_the_LS1_Crank_Reference on page 28.
• In the Operating Configuration window, input 24 into the Pulse Wheels cell for Crankshaft
(pulses/rev). See Setting_the_LS1_Crank_Reference on page 28.
• Start the engine.
• Lastly, use a timing light to verify that the BigStuff3 “Dash” timing advance value equals the
timing value seen (with a timing light) at the crank. Change the crank reference value in the
COP Crank Reference input box (not the crank Trigger Crank Reference box), in the Operating
Configuration table, up or down, until the “Dash” value and the crank value are the same. See
Dash_Window on page 29.
If the engine does not start, change the COP Crank Reference input to 360. Try to start the engine. If
it does not start, input the COP Crank Reference input to 370. If it still does not start, there is a
relationship problem between the cam and crank signals. The cam signal is occurring at the same time