rover /honda v6

[jago]

right i've been playing with help from my dad. if we reverse the wires we get a peek the trough. he had a look at the pcb i have from the donor car, and one of the signal wires is earthed as soon as it gets to the oem ecu.

The signal is put through some diodes, zeners and resisters. to make what would resembe a sqaure ish wave, so i'm just guessing that it was pot luck that got them wired that way as it would seam to only use half of the wave.

this is the same for the 6 tooth signal, but i could not start the car with it unpluged. so only had pcb to look at.

[rob@vems.co.uk]

The signal is put through some diodes, zeners and resisters. to make what would resembe a sqaure ish wave, so i'm just guessing that it was pot luck that got them wired that way as it would seam to only use half of the wave.

That bit sounds a bit like the conditioning circuit that you had me thinking about.

But if you can get the peak then the trough then you're laughing - and should be able to use these sensors quite happily.

I have little doubt that you'll be needing to use a few pull down resistors to clamp the noise that you'll inevitably get.

Rob

[jago]

yeah i may well do, i was going to use the scope on the lines at the vems once it's running on the 6 tooth wheel next week some time.

[jago]

i have finaly got the the time to try the vems in the car. i have decided to post here as i have no rpm on the log i've made and my igniter (oe) went pop

My primary trigger is a 6 tooth wheel in the distrobutor so i assume i just need a spark every tdc. i have also set my injection to alt batch fire as i dont yet have the 2nd trigger input chip.

log:
http://www.box.net/shared/fvb7nngo4g

trigger settings

[rob@vems.co.uk]

First off I'd try and use the 24 tooth primary trigger and get a sustained RPM reading.
Use 1.1.18: http://www.vems.co.uk/VEMSTech/VemsMT1.1.18Good.zip
Type: coil
Filering: disabled (this does not mean it filters the signal, but means it uses the angular width of tooth settings)
All other options disabled
Number of teeth on wheel: 24
Trigger tooth:1
Next trigger tooth: 4
Crank min period: 640
Make sure that your cam sync is disabled.