Hall Trigger dirak filtering

[AVP]

With the latest vemstune version, i get a validation yellow alert for this feature saying that unless i need it, i do not have to have it on.

I do not get any trigger errors at the moment, so should this be disabled?

[mattias]

It's only needed with noisy installs,  normally this is not needed.
Typically it was needed with some Toyota Supra installs where the old stock coils and wiring, in combination with high impedance VR/inductive sensors, caused a very bad combination.

[AVP]

so disabling it wont cause any harm, right?

[mattias]

Exactly.

You'll know if you need it.

[Ignitec]

i've never seen hall that need it...

[GintsK]

It's only needed with noisy installs,  normally this is not needed.
Typically it was needed with some Toyota Supra installs where the old stock coils and wiring, in combination with high impedance VR/inductive sensors, caused a very bad combination.

Dirac is just for hall/optical sensors. Not for VR. As I understand it filter possible spikes during signal active edge.

[mattias]

What I remember was probably what happened with Hall sensors on Supra stock harness, I know Jorgen had problems that created this feature:

# HALL dirac filtering. config12 bit7 and bit6

    * Highly experimental. Can filter very short spikes on HALL trigger input (usually from capacitive coupled noise from ignition wires - also depends on harness arrangement).
    * only enable it for low toothcount HALL trigger, if the pulse after the chosen edge is min 10 crankdegree long (or min 180 usec) and if you have mysterious trigger errors that you cannot get rid of, even with properly shielded trigger cable.
    * Must be disabled for VR trigger. Useless with VR trigger anyway (the LM1815 makes a constant pulse anyway if the signal goes below 0.0 V ... and that must not be filtered out for the trigger to work).
    * like for any VR, HALL-dirac filter must be disabled in both primtrig and sectrig with InputTrigger/ShortGapTrigger , InputTrigger/SubaruTrigger, (MembersPage/FiatStilo fiatstilo and subarutrigger).
    * config12=80 bit7=1 : HALL-dirac filtering for primary trigger
    * config12=40 bit6=1 : HALL-dirac filtering for secondary trigger (only very short pulses can be filtered on sectrig, even a 3-5 usec pulse might be accepted as a normal pulse)
    * config12=C0 HALL-dirac filtering for both trigger

[AVP]

i see.
its turned off now!