Precision Turbo and Engine BigStuff3 GEN3 Powertrain Controller Ignition Setup Tutorial - Manual (Page 26)

Start by removing the cam gear at the bottom of the distributor shaft by removing the roll pin with a
1/8” punch. Pull the distributor shaft out of the distributor housing. Remove the snap ring at just
below the reluctor. Using a hammer and non-destructive punch, strike the reluctor circumferentially
until it slides down the shaft, fully exposing the roll pin used to hold it in place. See the photos below.
25
Roll pin slot in the distributor
shaft. Reluctor is located
above the snap ring
Snap ring
Roll pin slot
in-phase
with the
center of the
reluctor.
BigStuff3 offers a reluctor with two (2) additional roll pin slots (see photo below BigStuff3 Part
Number JMI-007-012), shifted approximately 10
o
from the center of the reluctor tabs. One slot is 10
o
(camshaft degrees) clockwise (CW) while the other is 10
o
(camshaft degrees) counter clockwise
(CCW).
Reinstall the reluctor on the distributor shaft, using the correct slot for the engine rotation you have.
Remember you want to
ADVANCE the reluctor/pole piece while retarding the rotor. Then reverse the
steps to disassemble the distributor to put it back together.
Roll pin slot 10
o
from the center
of the reluctor.
Setting the Crank Reference (not for COP Engines)
The “Crank Reference” input is perhaps the most important timing value entered into the BigComm
software (see Operating Parameter Configuration screen print below). The crank signal tells the ECU
where the engine is in relation to TDC compression, cylinder number 1.