Triumph TR4A Ignition
The instructions that come with a 123 ignition are not so great. So if you are wondering what the yellow wire is for it is to go to a switch so that you can switch between curves. Curve 1 is around town. Curve 2 is sport.
We have gone for a 123 Electronic Ignition for the Triumph TR4A. You can visit the website for 123 HERE.
TR Register Forum Posts on the 123 Ignition
Click Here to go to the TR Register Triumph TR4A forum. There is an excellent posts the trials and tribulations on fitting the 123 Ignitions. Sounds a bit of a mission but the results appear to be worth it.
Here are all the features of the 123 Ignition offered :
- rotation CW and CCW ( autodetect )
- for 6 Volt and/or 12 Volt cars ( autodetect )
- variable dwell constant current, fully autom. ( autodetect )
- coil current protection time-out after 1 second ( autodetect )
- spark-balancing: better than 0,5 degr. crankshaft
- for positive and negative earthed cars
( 123\TUNE-8 is for neg.earth ONLY )
- two centrifugal advance curves
( 500 to 8000 rpm )
- two vacuum-advance and boost-retard curves
( 0 to 200 kPa or -30 inHg to +15 psi )
- two MAP-start fields
- two rev.limiters ( advanced random spark stealing )
- real-time tuning under keyboard-control ( ideal for working on a rolling road )
- rpm-stopwatch ( ideal for tuning using the road itself as a rolling road )
- luxurious import-from-file and export-to-file ( curves can easily be exchanged over the internet )
- electronic "dashboard" with :
temperature gauge ( selectable in degrees Celsius or Fahrenheit )
manifold pressure ( selectable in Bar or inches Hg / Psi )
rev. counter ( 0 to 8000 rpm crankshaft )
spark-energy gauge ( primary coil current )
total-advance gauge ( in degrees crankshaft )
- available in 4- , 6- and 8- cylinder models with various sizes and shapes.
The switch you can see below id so we can flip between curves. The illuminated switch next to it is for the heated windscreen.