Haltech Locked Timing - Anyone know what the split is?
#26
Senior Member
Originally Posted by crispeed
....Due to the design of magnetic/reluctor triggers as rpm increases ignition timing will vary or retard....
www.msdignition.com/pdf/tech%20bulletins/ tb_magnetic_vs_optical.pdf
Which does state that the signal is alternating (neg/pos) and amplitude of the signal does increase with RPM. From around 3V to ~50V. I also found that the zero (voltage) cross over point is always at the same point (when the tooth is directly infront of the coil).
I can only assume this retard comes from the ECU attempting to determine this zero voltage or the "trip" point of this alternating voltage signal. It seems this error could be reduced with gain adjustments. From my limited electronics understanding, Gain is the slope or rise rate of a signal. How exactly does this affect the "trip" point?
Does the ECU attempt to find this zero point by looking for the maximum slope? If I remember calculus correctly it is at this inflection point that it will be maximized. Then again, maybe it looks for an infection point (change in rate of the rate change, or 2nd derivitive, or where the slope of the slope changes),because that also exist at the zero point.
Any input?
Justin
#27
development
Thread Starter
Originally Posted by setzep
On a E6K Would it be advisable to reduce the gain until the engine cut off then increase the gain by one increment?
Thanks for sharing this info BTW!
Thanks for sharing this info BTW!
#29
Originally Posted by pistonsuk
How does decreasing gain help with ignition stability?
Justin
Justin
#30
Senior Member
Originally Posted by crispeed
I've noticed more gain more timing drift/retard and also more prone to noise.
Justin
#31
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thats the only reason the CAS exists. if the ECU cant read a trigger, what good is it?
basically increasing the gain will amplify the trigger signal sensitivity, and also Noise on the trigger signals increase so when you make the haltech more sensitive to this, it can start to pick up the trigger signal wrong, and be too "eager" to accept the trigger signal, either from a genuine signal, but read at the wrong time, or from noise in the circuit. this is when ignition timing can wander, because the haltech is too sensitive to the signal.
the only use for the CAS is trigger for the haltech, so i dont see any other side effects other than the haltech thinking the engine is in the wrong spot when it fires/injects (injection is far less critical)
basically increasing the gain will amplify the trigger signal sensitivity, and also Noise on the trigger signals increase so when you make the haltech more sensitive to this, it can start to pick up the trigger signal wrong, and be too "eager" to accept the trigger signal, either from a genuine signal, but read at the wrong time, or from noise in the circuit. this is when ignition timing can wander, because the haltech is too sensitive to the signal.
the only use for the CAS is trigger for the haltech, so i dont see any other side effects other than the haltech thinking the engine is in the wrong spot when it fires/injects (injection is far less critical)
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