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PostPosted: Thu Jul 25, 2013 10:44 pm 
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WRC
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Hi,

nibbles, could you mail me a drawing of your idea to me?

aha0699@gmail.com

thanks 8)

best regards
Alex

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PostPosted: Fri Jul 26, 2013 10:26 am 
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PostPosted: Fri Jul 26, 2013 11:19 am 
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Hi,

thanks a lot man 8)
but there aren'T 5V at the coils when switched, they are switching to the ground

greetz

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PostPosted: Fri Jul 26, 2013 11:48 am 
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Swap the 1k horizontal resistor for a direct link. In its place add a 1k resistor to +5v or maybe a 3k3 to +12v


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PostPosted: Fri Jul 26, 2013 5:12 pm 
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Are you saying you're feeding a negative pulse to the coils ?

I'm pretty sure that's not correct.

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PostPosted: Fri Jul 26, 2013 9:51 pm 
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Sunny,
please reply to the question I made you some days ago, so I can understand WHY you want/need to touch the injectors wirings.

Wolf_Tm wrote:
Sunny wrote:
Hi,

any tips how i can make the cops working together with the rpm meter of the cluster?



Do you have any available output on your Haltech ecu?

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PostPosted: Fri Jul 26, 2013 10:07 pm 
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We went through that in a thread somewhere Wolf although IMO it's well worth revisiting!


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PostPosted: Fri Jul 26, 2013 10:14 pm 
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two_OH_five wrote:
We went through that in a thread somewhere Wolf although IMO it's well worth revisiting!



Ah ok, so I must assume he has not any available output... :)

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PostPosted: Fri Jul 26, 2013 11:14 pm 
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I remember something about crazy voltages being required by the combo meter. However since 5/12v is being discussed here I think that limit is maybe not the case now


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PostPosted: Sat Jul 27, 2013 1:37 am 
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I guess I need to dig the sillyscope out to see what the standard setup does.

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PostPosted: Mon Jul 29, 2013 8:05 am 
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two_OH_five wrote:
I remember something about crazy voltages being required by the combo meter. However since 5/12v is being discussed here I think that limit is maybe not the case now



YES,
but once you have an available ecu output set up as a "TACHO" output, you just have to use a Tach Adapter to make the signal stronger:

http://www.msdignition.com/product.aspx?id=4709

Already successfully went through this way.

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PostPosted: Tue Jul 30, 2013 6:01 pm 
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Hi,

this is what i'Äam after

http://www.motec.com/forum/viewtopic.php?f=11&t=217

do you used the resistor or the coil?
possible that the following will work

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greetz

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PostPosted: Tue Jul 30, 2013 8:11 pm 
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After reading the motec forum, they are using a 'low side' (open collector / drain) output with a 4K7 pull up to +12. This is exactly as my circuit above (except they are using 4K7 not 1K).

AFAIK the COP drives are a positive 5V pulse (charges while high, sparks on the negative going edge) so feed these through the diodes to drive the base of the transistor, then the open collector of the transistor feeds a negative pulse to the tacho. It is probably neater for you to put the pull-up resistor in the instrument cluster as you showed above as it saves running 12V to the circuit.

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PostPosted: Wed Jul 31, 2013 7:45 pm 
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Hi,

but the prob is that the coils ain't not gave 5V, they just switch to the ground when fired

we tested a electronic today but without success, looks like it takes more then 14V.....try to get a look to the combi meter on weekend......

greetz

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PostPosted: Wed Jul 31, 2013 9:32 pm 
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Just looked back at my original quote about 215 coils earlier in this thread:

Quote:
ST215 coils:

http://www.mrm-racing.se/forum/showthread.php?t=1652

Take trigger line high for dwell time, spark on negative edge. Dwell times as follows:

8V 6.3 ms
9V 5.3 ms
10V 4.4 ms
11V 3.8 ms
12V 3.2 ms
13V 2.7 ms
14V 2.4 ms
15V 2.2 ms



What electronics did you try that failed ?

According to the above, there is a 5V (or 12V) positive pulse to each coil.
According to your own post 2 above from the motec forum the tacho should work with a negative pulse pulled down from 12V

It will be a few more days before I get the chance to test things on my own car to see what the standard setup does and what will work.

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