COP Thread
08-30-2013, 08:13 AM
#1604
Alright now that i learned what that graph is called i can actually search for it (before google showed like 2-3 non specific results and then bunch of chinese symbols). It appears that at 7 volts you would be running these things for ~5ms. That said if one runs these things in series of pairs it should bring down the voltage per coil to ~7 volts. Am i crazy for trying it? (To eliminate the need for a dwell reducer while running on stock ecu).
Would the trigger mix things up?
Would the trigger mix things up?
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08-30-2013, 08:18 AM
#1606
Boost Czar
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I searched against my posts with the search term: dwell battery cops
this was the first result:
https://www.miataturbo.net/diy-turbo...22/#post749575
this was the first result:
https://www.miataturbo.net/diy-turbo...22/#post749575
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08-30-2013, 08:21 AM
#1607
No? When you run the coil at lower voltage you need more time (dwell) to charge it up. The stock NB1 coils are charged for 5ms. The cops on the other hand are only for 2.3ms however at 7 volts they have to be charged for 5ms therefore running them in series should lower the voltage at the coils to 7 volts. Or am i thinking this completely wrong?
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08-30-2013, 08:51 AM
#1611
Right however wouldnt connecting them in series lower the voltage per coil to 7ish volts?
We have 4 coils. You connect the + of the 1st coil to +, you connect the - of the 1st coil to the + of the 4th coil, then the - of the 4th coil to ground. Same for the 2nd and 3rd coils.
We have 4 coils. You connect the + of the 1st coil to +, you connect the - of the 1st coil to the + of the 4th coil, then the - of the 4th coil to ground. Same for the 2nd and 3rd coils.
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08-30-2013, 09:26 AM
#1615
For those running COPs on their 1.6, did you add a second ground to the head?
I noticed there are 2 'lazzer' diagrams floating around the internet and one utilizes the OEM harness ground wire and the other adds an additional ground at the head.
I was going to opt of of the second ground since it seems like over kill and it's one more piece of cooper spagetti cluttering up my bay.
-Zach
I noticed there are 2 'lazzer' diagrams floating around the internet and one utilizes the OEM harness ground wire and the other adds an additional ground at the head.
I was going to opt of of the second ground since it seems like over kill and it's one more piece of cooper spagetti cluttering up my bay.
-Zach
With a little bit of filing the COPs fit great sideways. No excuse not to go this route since the wiring runs so much cleaner and you can use the cam cover bolts to secure the harness (important if you soldered the splices like me).
-Zach
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08-30-2013, 11:24 AM
#1616
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But why wouldn't you run them in parallel?
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08-30-2013, 12:15 PM
#1617
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each coil will have 1/4 the battery voltage, so ~3.5v.
good luck with your .0000001" spark gap.
also, you realize when one coil goes bad they all go bad? going to be interesting to see what happens when the first coil fires...as that would most likely momentarily cut power to the rest as it when send the power through the coil.
good luck with your .0000001" spark gap.
also, you realize when one coil goes bad they all go bad? going to be interesting to see what happens when the first coil fires...as that would most likely momentarily cut power to the rest as it when send the power through the coil.
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08-30-2013, 05:19 PM
#1618
each coil will have 1/4 the battery voltage, so ~3.5v.
good luck with your .0000001" spark gap.
also, you realize when one coil goes bad they all go bad? going to be interesting to see what happens when the first coil fires...as that would most likely momentarily cut power to the rest as it when send the power through the coil.
good luck with your .0000001" spark gap.
also, you realize when one coil goes bad they all go bad? going to be interesting to see what happens when the first coil fires...as that would most likely momentarily cut power to the rest as it when send the power through the coil.
4 coils... 2 pairs of series.
1st paired with 4th, 2nd paired with 3rd.
The main reason i'm trying to work around this is to be able to run these coils on the stock ecu when i have to pass emissions.
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