E-MAG E-113, Installation & Operating Manual

11 

Jumper for 

Low Advance 

this plug into the receptacle and secure with the anchor screws on 
each end.   

•

  3 lead coil plug to should be 

DISCONNECTED

 so the plugs cannot 

fire during these setup procedures.  

•

 MAP 

Sensor 

tube. 

•

  Spark Plug Leads - with sparks plugs installed in the engine (or 

plugs grounded to engine case). 

Variable Timing Limit

: 

The ignition will use engine rpm and manifold pressure to calculate the firing angle 
over a range of operating conditions.  There are two preprogrammed curves that can 
be called up by the operator by use of a jumper between thermals #2 and #3.  The  
standard  High advance curve will allow timing to 
advance as much as 39 degrees.  The low 
advance curve will allow timing to advance as 
much as 34 degrees.   

•

High Advance

 (up to 39 degrees) - 

NO 

jumper. 

•

Low Advance

 (up to 34 degrees) - 

WITH

jumper. 

Note 1:  E-MAG has NOT tested the myriad of 
fuel and engine configurations, and cannot 
prescribe which setting is appropriate for a given 
situation. In general, builders with high 
compression engines or those experimenting with auto fuels might want to use the 
low advance setting.  
Note 2:  Terminals #2 and #3 are an RS232 connection that will enable a number of 
enhanced communication and control features.   Watch for future announcements.  

Index Ignition Timing

: 

1.

Rotate your prop to the engine TDC (or TC) timing mark. 

 Note 1: It does 

not matter whether the engine is on the compression or exhaust stroke for 
a particular cylinder.  Note 2: On some engines, “TC” is stamped on the 
ring gear, which aligns with a reference alignment hole on the starter.  On 
others, a ring gear mark is lined up with the engine case seem. Consult 
you engine manual on how to locate TDC. 

2.

Setup mode is entered by turning 12 volt buss power ON, while the p-lead 
switch is OFF (grounded).   In setup mode the LED indicator (located at 
the base of the coil) will light continuous RED.  Turn the drive gear with 
your fingers slowly until you see the LED turn GREEN.  You will be looking 
for a single (very precise) point in the ignition’s rotation, so turn the gear 
slowly.   The GREEN LED signals the ignition’s internal crank angle