Lost sync with VW Hall Sensor at 5000rpm Solved!

fiesdachs · Post by **fiesdachs** » Sun Oct 09, 2011 11:31 am

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:

The attachment CurrentTune.msq is no longer available

and the latest log:

CurrentTune.msq: (88.27 KiB) Downloaded 85 times

Any ideas?

Thanks Steffen

EDIT:

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