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Tec3r Manual Version 1.11

- Page 51 -



For the TDC Setup,

Set the DFU #1 Trigger Wheel TDC to the 11

tooth.

Set the DFU #2 Trigger Wheel TDC to the 18

tooth.



In the

Dual Plug Timing Split

, set the values to 3 degrees for all RPM’s.



Wire DFU #1 -

Coil A1

output to

pin A

of a 4-cylinder DFU. This will fire cylinder A’s spark plug.



Wire DFU #2 -

Coil A2

output to

pin B

(not pin C!) of a 4-cylinder DFU. This will fire cylinder B’s

spark plug.



For Phase-Sequential Fuel Operation, wire both injectors to channel 1.

C.7. Rotary Engines

For rotary engines, the coil firing occurs on both the leading and trailing spark plugs. Using the

Dual

Plug Timing Split Table

, simply enter the desired split (in degrees) between the leading and trailing spark

plugs. For a 2-rotor engine, 4 single tower coils will be needed. References to DFU #1 in the software will
correspond to the 2 primary spark plug coils (coil outputs A1 and B1), and will fire the

leading spark

plugs

on rotors 1 and 2, respectively. References to DFU #2 in the software will correspond to the 2 secondary
spark plug coils (coil outputs A2 and B2), and will fire the

trailing spark plugs

on rotors 1 and 2,

respectively. Typically, rotaries work well with about 7-15 degrees of split between the leading and trailing
ignition under light load. Under full load, the engines generally make best power with closer to zero degrees
of split. A rotary will run on just the leading or trailing ignition, but a power loss will occur. Keep this in
mind when trying to diagnose ignition wiring problems.



Rotor 1

Leading: Coil Channel A1

Trailing : Coil Channel A2

Coil Channel A1 and A2 are split by the value in the Dual Plug Timing Split.



Rotor 2

Leading: Coil Channel B1

Trailing: Coil Channel B2

Coil Channel B1 and B2 are split by the value in the Dual Plug Timing Split.

C.8. Dual Plug Engines

For dual plug engines, there are two spark plugs per cylinder. Although it may seem that you should

connect both towers of one coil to the two spark plugs of one cylinder, this is

NOT

the case. Doing so

would require one coil to fire two spark plugs that are on the compression stroke, which would have a very
negative effect on spark energy. Instead, the coils must be wired so that each cylinder will have two coils for
its two spark plugs. Refer to the example of the 6-cylinder Porsche Dual Plug engine (

Figure C.4.4

) to see

how the wiring should be done.

Since most dual plug cylinder heads have a hemispherical design, the spark for both plugs on an

individual cylinder should occur at the same instant for optimum flame-front propagation. However, with
non-hemispherical dual plug heads, it may be desired to experiment with staggering the spark timing from
one plug to the next. To do this, the Dual Plug Timing Split Table can be used. The values entered into this
table represent the timing split (in degrees) between the two spark plugs on a particular cylinder. When this
is done, the flame front will begin at different areas of the cylinder at different times, resulting in an uneven
flame propagation. Consequently, it is recommended that most dual plug applications NOT use the Dual
Plug Timing Split.