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Uh oh 
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You would want to call them and ask if it can decode a 90 tooth wheel with no missing "teeth" for reference. There is a cam position "tooth" as well on the C5 wheel. If you can get it to read the crank and cam signals, that would open up sequential fuel injection and coil per plug and ignition control options.ericheath wrote:Wonder how C5 would interfuse with Micro-Megasquirt or the like? I believe their trigger wheel is 90 teeth and optical reader.
Sequential injection yes. Both signals are needed if you wanted to run coil per plug ignition and sequential fuel.Toehead wrote:As far as I know, a single missing tooth wheel rotating at cam speed is enough to do sequential.
Having both cam and crank signal allows you to utilize sequential fuel injection and coil per plug/coil on plug instead of a wasted spark system. That's what it gives you. Necessary? no. That's what it's for though. If the ECU used has the ignition outputs and the coils have built in igniters (like an LS1 coil) then you have no need for a separate ignition control, and the ECU can direct fire the coils. It's how I ran on my last megasquirt 3 with MS3X setup.Toehead wrote:Why? I am curious what an extra signal will give you.
The two missing teeth on the cam wheel when trying to simulate a crank trigger wheel signal. Cam spins half the speed of the crank, needs twice as many teeth/holes for crank position.socrace wrote:Not sure about the benefits of 2 missing teeth on a cam wheel. Although, the signal from it could appear similar to a crank wheel, if the 2 missing teeth were 180 deg apart.
Ahh, you are right. I was confused by what you meant.Toehead wrote:Dan,
Sorry, I should have been more specific. I'm curious as to why you need to simulate a crank signal to run coil on cap ignition and sequential injection? A single missing tooth wheel at cam speed should allow you to run without a cam signal. I am pretty sure that I read that on the MSextra manual, and it makes sense to me.
Edit:
about 3/4 of the way down: http://www.msextra.com/doc/general/sparkout-v30.html
to run sequential COP you MUST have a suitable cam signal:
* Missing tooth wheel at cam speed
* Missing tooth wheel at crank speed + single tooth at cam speed
* Non-missing tooth wheel at crank speed + single tooth at cam speed
* Non-missing tooth wheel at cam speed + single tooth at cam speed
The cam signal could be as simple as a magnet on the timing pulley and a hall sensor in proximity to it.