From the dfi manual
1) Use an adjustable timing light and the
CALMAP software to verify timing.
2) There will be a difference between the timing
read on the harmonic balancer vs. the CALMAP.
The timing read in the ignition map will be the
actual timing and what is read on the balancer
will be twice what the actual timing is plus an
error of 12°. For example: 52° on the balancer
would actually be 52-12 = 40/2 = 20° actual
timing.
3) This variation in the reading is due to the
nature of this ignition system which incorporates
a waste spark firing.
If you use a non-dial back timing light, just a cheapie one then the actual error will be 6 degrees, becuase the dial back timing light douibles the way it reads the timing,
So if you run a gen 6 dfi you better check your timing compared to what the balance says, and you will find if you put 20 on your map you should get about 26 degrees on the balancer with a non adustable timing light and 52 with a dial back light.
