Daytona Twin Tec LLC, 933 Beville Road, Suite 101-H, S. Daytona, FL 32119 Model 1005
(386) 304-0700 www.daytona-twintec.com
5/2015
Page 8
Figure 8 - Front Cylinder Timing Marks
GENERAL RECOMMENDATIONS
Coil primary resistance must not be less than 3
ohms. Most OE style dual fire and aftermarket single
fire coils meet this requirement. Coils for the new Twin
Cam 88
engine have low primary resistance and are
not compatible.
Due to the short lengths involved on motorcycle
applications, energy losses in spark plug wires are
insignificant. OE carbon core suppression cables will
deteriorate after several years. For a more durable
replacement, we suggest spiral core spark plug cables.
The Twin Tec module is compatible with all
modern "ground sensing" type tachometers including
H-D
OE and Autometer units. The red status LED is
internally connected to the tachometer output. If the
red status LED blinks, the tachometer output should be
functional. Some early tachometers require a high
voltage trigger pulse. In this case, you will require a
commercially available tachometer adapter.
VOES CONSIDERATIONS
The vacuum switch (VOES) provides the
vacuum advance required by all street driven engines.
Additional advance under low manifold pressure
conditions improves idle stability and fuel economy.
Most 1980 and later motorcycles are equipped with a
OE VOES. Without vacuum advance at idle and part
throttle, thermodynamic efficiency is reduced and
engine temperatures increase significantly.
The VOES is normally open. At low manifold
pressure (or manifold vacuum greater than about 5
inch-Hg), the VOES grounds the purple/white wire and
causes the Twin Tec module to generate additional
timing advance. The green VOES LED illuminates
whenever the VOES input is active (timing advanced).
Refer to the Evo Tech FAQ on our website for more
VOES information.
The use of a VOES is required for proper
operation of the Twin Tec module. If your motorcycle
did not include an OE VOES, you can use H-D
VOES
P/N 26566-91 for stock or mildly modified engines. For
high performance engines, we recommend our P/N
VOES-KIT-MC7. This is a complete kit with mounting
bracket and has a higher vacuum switching level (6-7
inch-Hg) that helps eliminate spark knock under light
load or throttle roll-on.
PC LINK CABLE AND SOFTWARE
The new Twin Tec USB Interface (P/N 18014)
provides PC connectivity for all of our engine controls
(ignition and fuel injection systems) and eliminates the
requirement for multiple cables or a separate USB
adapter. Two Windows based programs are available
for use with the Model 1005: PC Link Evo for
programming custom advance curves and other engine
parameters and Operating Statistics for viewing engine
operating data. The latest versions of our software are
always available for download on our website. The
software is free and will work in demo mode without a
EARLY STYLE
LATE STYLE
1996 AND LATER (1995 AND LATER EXPORT)
TDC 20° BTDC (NOT USED) 35° BTDC
TDC
35° BTDC
35° BTDCTDC
CAUTION: Do not use solid copper
spark plug cables or non-resistor type
spark plugs. The unit may misfire.
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