The TC88 provides coverage for all 1999-2003 carbureted Twin Cam 88^® engines. The 50 states street legal TC88 EX version features advance curves suitable for all street applications including high compression engines. The TC88 Race version includes race advance curves with a slightly wider adjustment range. The TC88 is constructed with a low profile machined billet aluminum housing. The TC88 offers easy plug-in installation and all the switches are accessible from the top - a significant advantage for most installations.

Five rotary switches are used to set the operating modes, adjust the initial timing and timing advance, and select the RPM limit. Since the new Twin Cam 88^® engine uses a non-adjustable crankshaft position sensor, mechanical timing adjustments are no longer possible. The TC88 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. For details, including advance curves, you can download the installation instructions from our website.

H-D^® motorcycles with the Twin Cam 88^® engine have a check engine warning LED on the instrument cluster. The TC88 communicates basic diagnostic information by blinking codes on the check engine LED. This eliminates the need for an expensive scan tool. Typical diagnostic codes include failed sensors or low/high battery voltage.

An optional USB interface and Windows compatible software allow the use of a laptop PC to program a custom advance curve for precise dyno tuning and access additional features such as rear cylinder timing offset. The USB interface plugs into the existing H-D^® diagnostic connector on the motorcycle wiring harness. The USB interface is sold separately, but Windows compatible software is available for download. The software will operate in demo mode without an ignition attached. 

This kit includes the external ignition module, ignition coil, and plug wires. 

•  Wide timing advance adjustment range accommodates stock to highly modified engines
•  Digitally set RPM limit in 100 RPM increments
•  Selectable multi-spark mode for quick starting and smooth cruise
•  Coil outputs protected against short circuits
•  Optional USB interface and software for programming custom advance curve
•  Billet aluminum housing with black anodized finish
•  Easy plug-in installation
•  Supports all sensors including theft/security module
•  Ignition coil fits most 1999 and later carb models - same size as stock coil Harley P/N 31655-99 (will not fit in place of Harley   P/N 31639-99) 

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