pistonsuk

Well I have been searching. I have read alot, this link was quite infromative:

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

dubulup

That is a good idea. I run my car on 0 gain. I have very strong grounds...I have no idea if this has anything to do with it, but when I installed the Haltech, it wouldn't read CAS at all, due to improper grounding, so of course like any rotorhead would do...I went over board

pistonsuk

How does decreasing gain help with ignition stability?

Justin

crispeed

I've noticed more gain more timing drift/retard and also more prone to noise.

pistonsuk

Are there any consequences of too little gain other than the signal being too small for the haltech to read it?

Justin

burn4005

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)