Author Topic: Rev counter & shift light outputs  (Read 16799 times)

Offline se7ensport

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Rev counter & shift light outputs
« on: April 15, 2007, 04:30:16 pm »
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

Offline dnb

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Re: Rev counter & shift light outputs
« Reply #1 on: April 15, 2007, 07:30:47 pm »
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.

Offline rob@vems.co.uk

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Re: Rev counter & shift light outputs
« Reply #2 on: April 15, 2007, 08:01:52 pm »
I'd suggest using the low current ones, check the table near the bottom of the UserGuide

Offline se7ensport

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Re: Rev counter & shift light outputs
« Reply #3 on: April 15, 2007, 08:42:11 pm »
Thanks guys, it's making more sense now, I initially thought they would be dedicated terminals rather than flexible.


Alex

Offline rob@vems.co.uk

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Re: Rev counter & shift light outputs
« Reply #4 on: April 15, 2007, 09:02:05 pm »
The whole thing is flexable and configurable, its a blessing and curse in equal measure :)

Offline rob@vems.co.uk

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Re: Rev counter & shift light outputs
« Reply #5 on: April 17, 2007, 11:39:02 am »
I've added the configuration and wiring of a shiftlight to the UserGuide
http://www.vems.hu/wiki/index.php?page=MembersPage%2FPhatBob%2FUserGuide

Offline se7ensport

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Re: Rev counter & shift light outputs
« Reply #6 on: April 17, 2007, 03:36:24 pm »
Simple when you know how  ;)

Offline se7ensport

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Re: Rev counter & shift light outputs
« Reply #7 on: May 01, 2007, 10:19:42 pm »
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

Offline rob@vems.co.uk

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Re: Rev counter & shift light outputs
« Reply #8 on: May 01, 2007, 10:27:55 pm »
What was driving it on the previously?

Rob

Offline se7ensport

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Re: Rev counter & shift light outputs
« Reply #9 on: May 01, 2007, 10:43:21 pm »
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?

Offline dnb

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Re: Rev counter & shift light outputs
« Reply #10 on: May 01, 2007, 10:48:25 pm »
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... 

Offline rob@vems.co.uk

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Re: Rev counter & shift light outputs
« Reply #11 on: May 01, 2007, 10:53:16 pm »
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.

Offline se7ensport

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Re: Rev counter & shift light outputs
« Reply #12 on: May 01, 2007, 10:57:55 pm »
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.

Offline lugnuts

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Re: Rev counter & shift light outputs
« Reply #13 on: June 25, 2007, 06:36:26 am »
<<<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

Offline rob@vems.co.uk

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Re: Rev counter & shift light outputs
« Reply #14 on: June 25, 2007, 12:22:54 pm »
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.