123ignition 123-TUNE-4-R-V User Manual page 9

to engine-brake or to shift gears. In both situations you don't want to create thrust anymore....hence the
GB
removal of the ( in this example ) 10,0 degrees advance does exáctly that !
Example 5
This demonstrates how to set the unit in a real-life situation, using the original data from the Bosch-
distributor 0.231.129.009 / 0.231.173.009 ; also referred to as the '009' !
As this distributor did not offer vacuum-advance, the manifold-pressure curve shows a straight line at
zero degrees. ( see the picture at the last pages of this manual )
For the aircooled VW engine and '009' distributor, the maximum advance MUST be between 28 and
32 degrees at 3000+ rpm ; so if you use this example curve, you should start by setting it statically to 7
degrees. This way it would reach exactly 28 degrees at 2600 rpm. ; at idle it would show 5 plus 7 degrees
is 12 degrees.
This is a safe way to start the tuning process : the advance at idle is not really important. ( an
engine will never be damaged at idle ) Too much advance at high revs. will eventually ruin an engine....
always be aware of this ! This example also indicates that it is possible, to integrate (part of) the static-
advance into the 123\TUNE.
TUNING WITH THE 123\TUNE
- Switch from curve #1 to curve #2
A very nice and easy way, to interactively check, is to switch over from curve no. 1 to curve no. 2 with
the yellow wire. ( see the drawings at the end of this manual ; please note the difference for NEG. & POS.
EARTH-ed cars. )