This page is to help with setting up the Primary Trigger option
Specifically for the VAG 60-2 wheel, but it will contain general information
MegaTune is an easy way to setup the trigger values, but you need to know what you are changing.
current decimal values
Primary Trigger | GRM setup | Mcel | ||
Edge | Rising | Rising | ||
Type | Multitooth | Multitooth | ||
Filtering | Disabled | Disabled | ||
Tooth Relation (Usually Disabled) | Disabled | Disabled | ||
Trigger Settings | ||||
TDC after trigger (degrees) | 60.0 | 60.0 | though I am guessing it should be 6dbtdc | |
Number of teeth on wheel | 58 | 58 | actual nubs | |
Trigger Tooth | 3 | 15 | The third nub after the space | (trailing/leading??) |
Next Trigger Tooth | 15 (V8)/20 4clyn | 15 | ||
Crank minimum period (usec) | 1280 | 1280 | ||
Tooth Width | ||||
Angular width of tooth | 2 | 2 | shouldnt this be 360/(# of teeth + missing teeth 360/60 = 6 | |
Tooth Relation to Normal (usually 181) | 181 | 181 | ||
Tooth Relation to Missing (usually 118) | 118 | 118 | ||
Phase | ||||
Angular width of missing tooth | 6 | 6 | ( shouldn't this be 12) | |
Engine Phase, when reset | 240 | 240 |
These are all you settings, but these are not normally how motorheads describe thier motors or triggers.
Typical Descriptions
- TDC -- Regular meaning when #1 cylinder is at top of rotation
- Number of actual teeth on wheel
- Number of missing teeth on blank spot on wheel if there were teeth there
- Relation of blank spot to TDC this would be in degrees
- Leading egde angle from TDC
- Trailing egde angle from TDC
So using these values how do we get the other ones.