360-1 trigger on a single cylinder

[mill383]

Can uS read a 360-1 wheel? Am having problems with this. It is a GM LT1 Opt-spark wheel. It has 360 shutter windows. I cut one slot out to make it 360-1.

Problem is, I get a config error (Number of teeth/cylinders conflict) when powering up uS.

Setup is:
>Engine Constants > # of Cylinders=1, Injectors=1, Even Fire
>Ignition Options > Toothed wheel, Skip Pulses = 1
>Trigger wheel settings > Teeth= 360, Missing Teeth= 1, Tooth #1 angle= 0, Wheel speed= Crank wheel

I am running MS/Extra 2.1.1 Pre code (because I want boost control) on a uS module.
Prior to cutting out the missing tooth, I had success making uS trigger using "basic trigger", thru the OPTOIN circuit, but that's only good for fuel only, I want ignition control also.

I know a 360 wheel sounds overkill, but I want to be able to kick-start this engine, and max RPM will only be 6000rpm.

As a side question, when it was triggering using "Basic Trigger", I couldn't find a place in the menus to divide the signal down. Is the code assuming one-pulse per cylinder as the only option?

Thanks,
Dave

[racingmini_mtl]

That's much more than what can be read by the CPU. The usual maximum number of teeth is 60 used with 60-2. It would possible to use more but 360 is 6 times more. Anything more than 100 would be pushing the limits.

And basic trigger means a single pulse per cylinder. There is no other option (it wouldn't be basic otherwise).

Jean

[Matt Cramer]

You might want to see Patrick's "Writing wheel mods" thread concerning Nissan ignition systems; some of that may be relevant to the Optispark (which uses the trigger pattern off a Nissan V8).