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

Last week I ran the microsquirt on a completely different battery and unhooked the ignition and injector connections. I tied the coolant, iat, and tps to 0 Volts. However, I still had the same problem of dropping the rpm signal during cranking.

Maybe the VR sensor and the microsquirt just don't ...

grippo,

I believe my ignition settings are setup properly. I think the problem lies with the VR sensor. When the RPM signal is there, the engine starts to kick up briefly until the RPM signal goes out again.

I didn't get a chance to try Bruce's suggestions today, big exam tomorrow :(

I'll give ...

The crank wheel is a 30-2 wheel

I'll give these suggestions a try first thing tomorrow morning.

Bruce,

I am using the dual spark option with just a single M-N crank wheel signal input.

Yes, there is a correlation. The delta_T column drops to zero when the rpm column drops to zero.

-Sean

Bruce,

The problem I'm currently having is the RPM dropping to zero during cranking. I have the VR sensor with the positive lead wired to the coax center and the negative lead wired to the shield, and the shield wire grounded to the same ground as the microsquirt.

My ignition input capture is on ...

Geoff,

What sort of experiments could I try with the microsquirt to get a clean rpm? A pullup resistor? I'm just running out of time to try and get this microsquirt working.

Yeah, I have done that several times. The way I have it setup is the only way I can get some sort of a tach signal.

We currently have a motec hooked up the same motor, and it runs the engine with no problems. I'm guessing it's the VR circuit, how do I go about tuning it?

How do i go about tuning my VR input circuit?

The pulse tolerance didn't seem to help much.

Here is my msq.