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Author Topic: rev counter input?  (Read 31742 times)

Offline MWfire

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Re: rev counter input?
« Reply #15 on: November 02, 2009, 04:35:35 am »
p259 ch0 has pull up resistors on most board. So you can use p259 ch0 without adding resistor.
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Offline Tony C

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Re: rev counter input?
« Reply #16 on: November 02, 2009, 04:45:30 am »
not sure regarding my board,
wonder if Rob or Dave would know,
how can i tell if ones fitted?

CH0 thats pin4 on the ec36 yeah?
as used by the cooling fan if used,
im not using the fan on mine so can use this instead of CH1 what the tacho is on now,
« Last Edit: November 02, 2009, 04:50:04 am by Tony C »
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Offline MWfire

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Re: rev counter input?
« Reply #17 on: November 02, 2009, 04:52:41 am »
you can measurement voltage on that pin. 12V when is disable, 0V enabled.
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Offline Tony C

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Re: rev counter input?
« Reply #18 on: November 02, 2009, 05:01:25 am »
cheers mate will do that tomorrow,
i gather thats with tach output enabled and disabled on ch0?
if i get the readings you posted does that mean i have the pull up resistor fitted?
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Offline MWfire

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Re: rev counter input?
« Reply #19 on: November 02, 2009, 05:03:05 am »
Quote from: Tony C on November 02, 2009, 05:01:25 am
cheers mate will do that tomorrow,
i gather thats with tach output enabled and disabled on ch0?
if i get the readings you posted does that mean i have the pull up resistor fitted?
for test you can use water pump output. Put 100C and if you have 12V then you have pullup resistor.
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Offline Tony C

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Re: rev counter input?
« Reply #20 on: November 02, 2009, 05:55:14 am »
set waterpump channel like this?,
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Offline dnb

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Re: rev counter input?
« Reply #21 on: November 03, 2009, 02:34:41 am »
You'll probably need to use a LED.  Bulbs require more than the maximum 350mA from a P259 output to light...
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Offline Tony C

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Re: rev counter input?
« Reply #22 on: November 03, 2009, 03:01:50 am »
ah not got any leds at the mo,
will try the water pump channel first to see if i gets 12v, if so will try the rev counter on that pin.
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Offline dnb

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Re: rev counter input?
« Reply #23 on: November 03, 2009, 03:18:19 am »
They all worked when the ECU was here.  I got the test box LEDs to flash using each P259 output as the tacho output in turn.
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Offline Tony C

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Re: rev counter input?
« Reply #24 on: November 03, 2009, 03:38:23 am »
strange,
wonder why the rev counter wont work then,
any ideas?
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Offline gunni

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Re: rev counter input?
« Reply #25 on: November 03, 2009, 03:42:34 am »
Is it wired up right and known to work?

What you could do is wire the tacho up, the signal line should trigger of a injector pulse.
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Offline Tony C

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Re: rev counter input?
« Reply #26 on: November 03, 2009, 03:49:16 am »
yup wired correctly
and was working fine last year when i was running a coil and dizzy.
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Offline gunni

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Re: rev counter input?
« Reply #27 on: November 03, 2009, 04:19:02 am »
Can you verify the input the tachometer likes to function
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Offline Tony C

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Re: rev counter input?
« Reply #28 on: November 03, 2009, 04:29:54 am »
this im not sure of mate,

just found this on Autometers website,
our tach needs to see (12v square wave).
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Offline Tony C

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Re: rev counter input?
« Reply #29 on: November 03, 2009, 04:34:51 am »
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Vems Ecu, Twin Plenum efi and N2o
13.314 @ 104.39 mph (10/06/07 3.9 v8)
Sponsored by: www.caprisport.com & www.interpart.biz
Web site: http://www.capriracing.co.uk

Vems Firmware: V1.1.74
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