A single TC88A part number provides coverage
for all 2003 and later H-D® carbureted models using
the new 12 pin ignition module. The TC88A is constructed
with a low profile machined billet aluminum housing. The
unit offers easy plug-in installation and all the switches
are accessible from the top - a significant advantage for
most installations.
Four rotary switches are used to set the
advance characteristics and RPM limit. Since the new engines
use a non-adjustable crankshaft position sensor, mechanical
timing adjustments are no longer possible. The TC88A solves
this problem with a switch for setting the initial timing.
A second switch sets the slope of the advance curve. The
combination of these two switches allows the user to optimize
the timing advance for a wide range of applications - from
stock to highly modified engines.
New H-D® motorcycles use the SAE J1850
data bus for communications between the ignition module,
instrument cluster, turn signal/security module (TSM/TSSM),
and diagnostic scan tools. The TC88A fully supports this
new J1850 data bus including the use of the H-D® scan
tool to read sensor data and clear diagnostic codes.
The TC88A features built-in data logging
that stores data for the last 30 minutes of engine operation
including RPM, vehicle speed, manifold pressure, ignition
advance, and battery voltage. Engine builders will find
the data logging feature highly useful for tuning, diagnosing
problems, and reducing unjustified warranty claims.
An optional PC link cable and Windows compatible
software allow the use of a laptop PC to program a custom
advance curve for precise dyno tuning, download data logged
by the unit, and access additional features such as speedometer/odometer
recalibration (to accommodate tire and gear changes). The
PC link cable plugs into the existing H-D® diagnostic
connector on the motorcycle wiring harness. The PC link
cable is sold separately, but Windows compatible software
is available for download. The software will operate in
demo mode without an ignition attached.
Like the H-D® OE module, the TC88A sends
RPM data to the OE tachometer over the J1850 data bus. TC88A
units with firmware revision 2.0 and higher also provide
an optional 12 volt square wave tach signal (one pulse per
revolution) that is compatible with most tachometers intended
for 1999-2003 Twin Cam 88® applications. This allows
you to retrofit a wide range of tachometers to newer 2004-2006
models. Please download the TC88A installation instructions
for details on tach hookup. If you plan to use the optional
tach hookup, you will require the PC link cable and software
to enable the tach output. TC88A units with firmware revision
lower than 2.0 can be factory reprogrammed to add the tach
output feature (please call for details). |