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

Hy,

have some problems with my VW Hall sensor on my engine. The engine is running nice until 5000rpm at this point it looses sync.

Current Configuration:
60-2 VW Hallsensor (5V)
Using VR1 +/- Input with Bruce "Hall offsetter circuit"
Hall Sensor wiring far away from any other wires


So here is what i already did:

In the past i connected the hall sensor to optoin +/- with a 5V Pullup (resistor between 500-1000Ohm) with this config. i lost sync. between 2000 and 4000rpm depends on the pullup resistor. I also measured the signal with an oszzi and the signal wasn´t really nice (2,8V signal with bad square wave signal, the beginning ot the teeth is a curve and the end is a sharp edge like it should be)

So i made a new wiring for the sensor which is far away from any other wiring. I also changed the sensor (both are new) --> no effect still synch lost at around 4000rpm

Then i connected the hall sensor to the VR1 +/- with Bruce "hall offsetter circuit" with small changes i used a 5V pullup with a 330Ohm resistor instead of the 12V an 4,7kOhm. And i used a 1N4004 instead of a 1N4001 because this wasn´t available. So now i got a really nice 4V square wave signal on the VR1 with a oszzi. Now i have synch lost at 5000rpm... My redline is at 7200rpm

sorry for my bad english but i´m from germany...

attached my current msq: and the latest log: Any ideas?

Thanks Steffen

EDIT:

Problem is solved! I removed C27 and C26 on the Board. And now it works great!!!