RPM problems

[eNcode]

Hi to all ,

RPM input is from coil ( signal wire) – but i can’t get it to be stable, it is bouncing up and down.– you can see that rpm is example 800 then 320 then 800 then 0 then something.
I did update to Firmware 1.5.6. – so I’m asking for help.

Car is octavia 1.8T - AGU engine

[NOTORIOUS VR]

You're going to have to do better on describing the problem you're having.

What do you mean by RPM problems.  RPM gauge on the cluster?

RPM input from coil? input to where?  Why from the coil?

[eNcode]

problem is on gauge - on instrument cluster everything is ok !

so wire is goring from engine coil ( signal wire ) to rpm input of gauge pin 10 on big connector like show in instructions!
I tried from coli and injector - but it is acting apsolutly the same - any other sugestion ?

[eNcode]

i tried to use signal from cluster and connect it to vems round gauge but then my car is not working ok ( strange )

form coil ( it has 3 wires - im connected to signal wire ) im geting ok RPM but i have sudden drops to 0 or some x rpm.
this also happend when i was connected to injector

[mattias]

Sorry, never realised it was a round gauge you were talking about - it is in the correct section of the forum.

Refer to these pages :
http://www.vems.hu/wiki/index.php?page=AfreshTiny%2FRpmInput
http://www.vems.hu/wiki/index.php?page=AfreshTiny

I would take the rpm signal from the coil signal wire which normally is a 0 to 5 Volt signal: If if the coil has it's own ignitor. Never connect to the power side.

Try experimenting with pin 11 :

RPM reference threshold voltage of the RPM input can be adjusted; leave open unless needed:
*   pull with a 47k..100k resistor to 0V to make it sensitive to extremely low signal
*  or pull with 47k..200k resistor to WBO2/pin5 (which is pump- = 4V) to make it less sensitive (more tolerant to noise)