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Tec3 to '77 180b SSS(200B SSS) Tacho http://www.ozdat.com.au/forum/viewtopic.php?t=8488 |
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Author: | Johann [ Mon Aug 28, 2006 4:44 am ] | |
Post subject: | Tec3 to '77 180b SSS(200B SSS) Tacho | |
It has been asked before I guess but I can't find specific SSS tacho info. The Tacho itself has a Red, Yellow and Black wire going to the Tach/Speedo circuit board. From there on the Black appears to be ground, Red a power source and the Yellow wire changes to Black/Blue. How do I hook it up to the Tec3 EMS? From the Tec3 manual,
Tachometer Output
The tachometer output on the TEC3r is a +12 Volt square wave. Each time a coil fires, a ?tach pulse? is generated. Therefore, the output from the tachometer signal is ground, then +12 Volts for 30 degrees of crankshaft rotation starting at each TDC/spark event. A 4-cylinder will output 2 tach pulses per revolution, a 6-cylinder will output 3 tach pulses per revolution, an 8-cylinder will output 4 tach pulses per revolution, and a 12-cylinder will output 6 tach pulses per revolution. For applications that have a tachometer configured for a different number of cylinders than the engine (i.e. a 6-cylinder car that was converted to an 8-cylinder), there is the option of changing the tach output type in the software. This type of signal is compatible with most new-style tachometers. However, some older tachometers trigger off the high-voltage signal from the ignition coil (C-). These types of coils require the use of a tachometer amplifier, since they are designed to trigger off of a 120 Volt signal. Tachometer amplifiers (PN: 150-15210) are available from Electromotive to suit these applications. |
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