switching circuit for crank ref. signal needed (please help)

[Jörgen Karlsson]

Hi,

Can the Linkplus really handle 135 teeth per rev?
I doubt it. But you really want to count 270 teeth per cam rev... But if the
link can do it you only need to make sure that the cam ref occurs before the
crank ref. When the cam ref passes the hall sender you let that trigger a
555 timer that activates an analog switch to let the signal from the crank
through to the ecu. A 4066 quad analog switch should work fine.

Most aftermarket systems time the system from the cylinder pulses, in your
case that would be ten pins on the flywheel. As long as the ref pulse is
between the right two teeth the timing will be spot on.

You could install a number of pins in the flywheel to be able to run a 60-2
I think that Link can handle that. The downside is that two of the 15years
old very expensive Audi trigger will have to be kept.


I have thought about another option, if all three stock sensors are
connected to a small microcontroller you could let the microcontroller count
the teeth on the flywheel and keep track of the two sync sensors. That way
you could simulate a suitable trigger setup.

Most microcontrollers can count a set number of teeth and then activate an
output without software interaction. You would only have to keep track of
the two ref triggers and reset the teeth counter accordingly.

The downside is that all 15years old very expensive Audi triggers will have
to be kept;)

Jörgen Karlsson


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