ECU tachometer pulses

[Brett]

How many pulses per rev does the ECU output on a 92 spec Apexi?  (Presume the same as the 92 spec FD...but I don\'t know what that is either!)

:confused:  :wiggle

[Brett]

Anyone?

I\'m hoping its two pulses per rev....?

[Prof]

It will be the same for any 13B
 
This site had a good explanation:
 
http://www.teamfc3s.org/info/articles/demystifying.html
 
but seems to be down for maintenance.
 
From memory, the rotor turns ar 1/3 shaft speed, but the rotors fire at 180 degrees of shaft rotation, as you have 3 events per rotor (3 faces), 2 rotors (because the apex and faces are offset by 120 degrees), but 1/3 the number due to gearing, giving 3*2/3 = 2
 
The other way to tell, is the CAS sensor has only 2 teath on the cog for firing events, the other sensor is for crank angle.

[Brett]

Cheers prof - you\'re awesome as always