Can someone explain trigger angle?
#1
Can someone explain trigger angle?
so...I got a MSPNP for my miata and I'm at the point where I need to set base timing. It's telling me to adjust the "trigger angle" but I'm a little confused about what that really means.
Does this simply mean that I'm telling the computer that the cam is approcahing TDC earlier/later than it is so that it will in turn adjust ignition timing?
I guess what i really want to know is: what am I changing/affecting when I adjust trigger angle?
I could just go in there blindly and messing w/ values but I want to have a complete udnerstanding of what's going on.
thanks!
Does this simply mean that I'm telling the computer that the cam is approcahing TDC earlier/later than it is so that it will in turn adjust ignition timing?
I guess what i really want to know is: what am I changing/affecting when I adjust trigger angle?
I could just go in there blindly and messing w/ values but I want to have a complete udnerstanding of what's going on.
thanks!
#2
Trigger angle is the angle before TDC where the Megasquirt "thinks" it's getting a signal from the CAS. If you have a trigger angle of 60 degrees and a spark advance of 20 degrees, for example, the Megasquirt waits for a signal from the CAS, then counts down the amount of time at your RPM it would take to turn 40 degrees, then commands it to fire a spark. If the CAS signal actually came in 65 degrees BTDC instead of 60 degrees BTDC, the spark would happen at 25 degrees when the Megasquirt "thinks" it's happening at 20.
So the goal there is to make the physical trigger angle match the angle that the Megasquirt is using to calculate its ignition timing.
So the goal there is to make the physical trigger angle match the angle that the Megasquirt is using to calculate its ignition timing.
#5
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This doesn't specifically cover the technical background of what exactly trigger angle is, but Matt's already done that now, but check out this video for hints on setting up your base timing with your MSPNP MM9093 (or any MS1 Extra car).
http://www.megasquirtpnp.com/models/...#Section_Seven
http://www.megasquirtpnp.com/models/...#Section_Seven
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Jerry a.k.a. 'FoundSoul'
DIYAutoTune.com
'91 Miata BEGi S3 GT2560 w/ MSPNP - 14.1psi - 253whp, 232wtq
'95 Miata n/a
A few other cars....
Jerry a.k.a. 'FoundSoul'
DIYAutoTune.com
'91 Miata BEGi S3 GT2560 w/ MSPNP - 14.1psi - 253whp, 232wtq
'95 Miata n/a
A few other cars....
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