Knock Sensor Question

[Rolls]

I am looking at building/buying my own knock light (something like this http://www.viatrack.ca/ ) for my car as I have an Redtop RB20DET HR31 which does not have an engine light as far as I know. Now I know the knock sensors read between 8-10v when not experiencing knock and reduce it when they find knock. Does anyone know how this voltage translates to the readings people get on their power FC/SAFC 2s so I would know how to configure the light.

Eg over 60 on these is considered bad, any ideas what kind of voltage I'd be looking for?

[mattymagoo22]

i think you'll find that the common knock sensor is a piezo crystal that produces a voltage according to level of stress applied to it when pre-ignition happens. I'm pretty sure its no more than like 2V and I think there is a jaycar kit that had an LED output.

Hope this helps

Matt