2-6-6-2 chip

[OlddManWithHO]

Does your 2-6-6-2 loco have a CAM input for synchronization of chuffs?  If so then my C&O non-sound loco can be wired up properly with a sound decoder with cam input.

[uncbob]

Sounds like it does but without taking the engine shell off I don't know

[Jim Banner]

With a bit of fine tuning, the Tsunami decoders can track piston speed incredibly well even without a cam.  The BEMF circuitry matches actual speed to speed command and thus to chuff rate very well.  With BEMF there is little change in speed with load or temperature so once adjusted, the speed stays in sync with the sound.  There is no applying throttle and having the engine chuffing away while the locomotive is standing still or the locomotive reaching 20 miles per hour before the cuff starts.  When I first saw it, I could not believe the locomotive did not have a chuff cam.

With the after market Tsunami, a chuff cam is an option and they are not too hard to make.  So you have the choice - fine tune the BEMF or add a chuff cam.  In either event, you will need a DCC system that can program the CV's.

Jim