MicroSquirt.com read only forum (Jan.15,2018)

So far i've got everything else nailed down , power/main ground /sensor grounds /iat clt o2 tps Injector all setup and wired, got past the .ini mistake i made myself and got the microsquirt to stop cycling the Fuel pump.

anyways , I'm using the vr input so far and am getting errattic RPM readings , from 1150 to 12000 rpm while cranking . do i have to use a HEI module to use the vr sensor inside the motor to clean up to spikes and get a clean rpm reading.

I'm charging the battery now from cranking it to death. No fuel spray yet.

any help would be greatlt appreciated..
Jeremy.

BTW : Microsquirt 2.881 mt 2.25 1 cyl yamaha 660 raptor 19lb per hr injector ,

I've looked at the diagram and it has 3 white wires and a red and a white w/green coming from the stator , there's 2 wires coming from a pickup assembly of some sort, those colors are red/white and green/white

when i trigger from those 2 i get variable rpm output from MT from 300 to 13k +.

do i have to use some kind of pullup voltage ?

16vconvert wrote: anyways , I'm using the vr input so far and am getting errattic RPM readings , from 1150 to 12000 rpm while cranking . do i have to use a HEI module to use the vr sensor inside the motor to clean up to spikes and get a clean rpm reading.

I a not familiar with this setup, how many teeth on the crankwheel? And I assume this is a standard VR sensor, correct?

Lots of noise during cranking can be from noise from the starter motor back-filling the +12V supply, or a voltage drop on either the ground return or +12V.

Do this if you can - unhook the injectors and ignition outputs, then unhook the +12V wire, then power the MS from another power supply, like a +9V battery - hook the ground to the engine ground and the +9V from the battery to the +12V in on MS. With this you should have MegaTune running. Then crank and see if the erratic signaling is still there - this will help eliminate the vehicle power supply as the noise source...

- Bruce

I'm going to pull the cover off where the pick-up is located to see what kind of Ign setup in on the flywheel/stator/rotor assembly. I imagine it's a flying magnet setup, But how many teeth ? , that question will remain unknown until I pop the cover.

I'll post some pictures on photobucket for reference.

http://manuals.dqt.be/index.php?option= ... 5467616733

well , i took the cover off the magneto side of the motor , the pickup I am using for the crankshaft has a single 60deg tooth . how should i use this for input into the uS , am I going to have to Modify the flywheel to accept a 36-1 or equiv ? are there settings for a single tooth of a specific degrees ? Btw it's a one cylinder 5 valve 4cycle engine , with CDI ignition right now. can I use the CDI for Rpm ?

Some yamaha CDI's have a tacho output that produces a 12v wave that could be used to trigger the uS, but I assume you want to control the ignition via uS and not just fuel?

The 3 white wires are your high voltage wires which should go to the CDI.
The others should be your low voltage/charge circuit wires.

I also have a Yamaha, but I had to use an aftermarket programmable ignition because uS did not support my configuration. Lucky for me the aftermarket ignition had a 12v square wave tacho output, so I can reliably trigger the uS from there.

yeah , 3-white 2-grn/white 1-red/white 1-red

I'm triggering of the red/white and grn/white. but the tach is erattic . and I don't know how to use the pickup.

where'd you get that cdi that has a 12v square wave ?

http://www.zeeltronic.com/page/cdi.php
You can also add a VCDI and hand controller to control your ignition curve.
His CDI's do not have an ignition curve in them.

any specific box they sell that you'd reccomend ? I'm kinda in need of a 12v square wave here...Hell i'd settle for a 5v !

Thanks for the help so far !

You could email the guy. He is very helpful.
His name is Borut and email info@zeeltronic.com

Just tell him about your application and he can probably recommend something.