Ignition input capture setting

[chris24g]

v 3.0.16/ms1/msextra 029y4

using a 4 window bosch distributor. how do i change the rising/falling edge option?

[jsmcortina]

That is not possible on MS1.

James

[chris24g]

thanks for the clarification. what will be the effect of not being able to invert the signal? i did modify the circuit board for the hall sensor input per the msextra doc.

[dontz125]

Edge selection is critical with VR sensors, because of the asymetric wave form. With the sharp square wave of Hall sensors it doesn't matter so much.

I would suggest that the only difference you'll see is a crank angle offset equal to twice the dizzy window angle (cam degrees vs crank degrees).

[chris24g]

trying to wrap my head around this one:

following the hall sensor setup procedure
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1) Set the crank at TDC
2) Rotate the distributor (opposite direction) just until middle LED turns OFF (sets the crank angle)
3) Make sure the rotor arm points towards the correct contact in the distributor cap
4) Fix the distributor
5) Turn engine backwards until middle LED turns ON (should be almost immediately) and continue turning until it turns OFF again
6) Measure angle BTDC (+/- 10 degrees is good enough) at the crank
7) Enter measured angle in "Trigger angle"
----------------
i count 4 1/2 teeth on my cam (which has 44 teeth) so each tooth is worth about 8 degrees. thats 36 degrees so that means 18 degrees of angle on the crankshaft.

now the problem is that MSextra doesn't like values between 15 and 40 degrees for the trigger angle. the only thing i can think of is that the manual says +/- 10 degrees of accuracy, so i can use 10 degrees for the trigger angle and work from there. *shrug*