Rev counter & shift light outputs

[se7ensport]

Currently putting together the loom following the diagrams within phatbobs guide, however, can't spot info on rev counter or shiftlight outputs.

Info that might me needed:
I'm running a wasted spark set up on 4 cylinder engine, smiths rev counter previously driven by alpha ecu (it's variable in that I can select from 4-8 cylinders).

Recommendations for each appreciated.


Alex

[dnb]

Rev counter output can be any of the outputs.  It's selected through software.  I use "Misc 2" or something.

The same goes for the shift light, only this time you can use one of the "Misc out" settings in the software.  The same thing applies - it can use any of the physical outputs you have spare.

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I'd suggest using the low current ones, check the table near the bottom of the UserGuide

[se7ensport]

Thanks guys, it's making more sense now, I initially thought they would be dedicated terminals rather than flexible.


Alex

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The whole thing is flexable and configurable, its a blessing and curse in equal measure :)

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I've added the configuration and wiring of a shiftlight to the UserGuide
http://www.vems.hu/wiki/index.php?page=MembersPage%2FPhatBob%2FUserGuide

[se7ensport]

Simple when you know how  ;)

[se7ensport]

Trying to get my tacho to work, I've set the output to pin 3 from within megatune (unsure about divider as well?), the tacho I have allows me to select input settings, will any of the following work without needing to use a pull up diode?

Signal input settings:
Contact breaker ignition
Hall effect
ECU (open collector output)
ECU
Alternator
Signal generator

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What was driving it on the previously?

Rob

[se7ensport]

the previous output came from my alpha ecu (currently on ebay  :D ) and the tacho was set to hall effect, i've tried this but didn't get a response, either I need to change the divider, the tacho input or most likely both?

[dnb]

The tacho should be set to ECU (open collector) IIRC.  The divider can be set when you get some kind of reading on the tacho... 

[[email protected]]

VEMS doesnt put out any voltages (apart from the stepper pins), as it switches to zero.

What hall voltage is it expecting?

What I did the Nissans was to connect a 330ohm resistor between EC36pin28 5V out, and EC36pin3 (P259 ch.4), and EC36pin3 to the tacho.  When the VEMS switches pin3 to ground, the voltage drops to zero, at other times you get +5v.

This could just as easily be a +12v supply if thats what the tacho is wanting.

[se7ensport]

Thanks guys, I'll give the ECU ope collector a go first, if it doesn't work I'll try the resistor option.

re: hall sensor, it can use the positive signal from the hall sensor, I can do this easily but after all the comments about avoiding noise in the system it seems a daft thing to do, I could be wrong though.

[lugnuts]

<<<What I did the Nissans was to connect a 330ohm resistor between EC36pin28 5V out, and EC36pin3 (P259 ch.4), and EC36pin3 to the tacho.  When the VEMS switches pin3 to ground, the voltage drops to zero, at other times you get +5v.
This could just as easily be a +12v supply if thats what the tacho is wanting.>>>

- Could you show me how to do this? Is the resistor value the same 330 ohm? And does this make the 5v supply un-usable to power other functions(launch control switch, fuel pressure sensor)?

Here is my OEM tach info:

Tach +10.8v, 66% DC "on", 3 tach signals per rev.

Thanks!
Kevin

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Theres plenty of current available with the 5v supply maybe I'd need to up the resistor value if I wanted to use the ALS,Shiftcut and what have you.
Just wire 12v via say a 1K resistor to the channel rather than the 5v.