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Old 01-29-2013, 12:46 PM   #1
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Decrease spark dwell time, improve firing?

Spent most of my days on Mazdaspeedforums.org when my Speed6 was my daily driver. One interesting idea a couple of us came up with was instead of upgrading the coil on plug system with a proper 4 channel CD ignition system, we tried to improve the coils themselves.

I'll see if I can pull/take pictures soon. I believe our car, like most non-sport NA engines, we have a narrow band primary O2 sensor. So pretty much anything at WOT is out the window for recording, measuring. Most cars are tuned to be very rich in these scenarios and in worst cases, too rich (safer than too lean!)

Most of the guys who have installed at least a CAI will see more uppen rpm power BECAUSE the stock tune will go fairly rich at WOT, the new intake giving more air, will lean that out and possibly give a leaner, better a/f ratio for power. I'm sure if you WOT a lot in this car you will see VERY dark, carbon fouled spark plug tips (on the outer edge for rich WOT).

Now after all of that precurser, here is what we did: replace the COIL on plug boot wires that touch the spark plug with those of lower resistance. The stock aluminum ones are good but I remember they still showed a couple mili ohms or something of resistance. Replaced it with a copper strand (not coiled but meshed) and the resistance is about 1/4 of the stockers.

May be breadcrumbs but since I'm sure everyone has some copper wire sitting around somewhere they aren't needing (need maybe a foot for the entire project), it is relatively a cheap mod. Idea that this would improve the most in higher rpm instances where the spark is weaker, slower to ignite. Yes, I know COP is much better than previous ignitions but why not? Getting a more efficient burn at idle and at WOT is a good thing. The knock sensor on these engines (prob same on the Mazda's, so VERY sensitive) will pull things back if any pinging is noticed.


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Old 01-30-2013, 05:58 PM   #2
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Our air fuel sensors are wide band. I LIKE THE IDEA OF MODDING THE FACTORY COIL BOOTS.
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Old 01-30-2013, 06:49 PM   #3
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Thanks SPRAYPANT! I have access to AllData but there hasn't been a lot of factory info provided for 2012's. Haven't had a need to get my hands on the factory manual haha.

Ahhhhh we just need a tuner! Having a factory wideband makes tuning soooo much easier. I wish this car was MAP based like the ST but I'll take what I can get :P
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Old 01-30-2013, 07:14 PM   #4
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Quote:
Originally Posted by Roadworthy View Post
Thanks SPRAYPANT! I have access to AllData but there hasn't been a lot of factory info provided for 2012's. Haven't had a need to get my hands on the factory manual haha.

Ahhhhh we just need a tuner! Having a factory wideband makes tuning soooo much easier. I wish this car was MAP based like the ST but I'll take what I can get :P
http://www.helminc.com/helm/product2...112&itemtype=N

Factory service manual cd for the 2012 Focus/BEV/ST.


http://www.motorcraftservice.com/vdi...=productdetail
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Old 01-30-2013, 08:15 PM   #5
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Thought this was a download link for it, almost pooped a little. Got my hopes up too soon
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Old 01-30-2013, 08:34 PM   #6
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Thought this was a download link for it, almost pooped a little. Got my hopes up too soon
I never said it was free, just that it was available.
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Old 01-30-2013, 11:00 PM   #7
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back on topic...lol

I'm going to see if I have some solid wire (from overhead light box) that I could scavenge and cut to length. I'll give measurements and results in the coming days :D
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Old 01-31-2013, 09:15 AM   #8
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These are for OBX SUPER DIRECT IGNITION / COIL PACK - MAZDA 3 MZR 2.0L / FORD FOCUS DURATEC 2.0L

http://www.racingpartdepot.com/servl...IL-PACK/Detail
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Old 02-06-2013, 06:55 PM   #9
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THIS (http://i224.photobucket.com/albums/d...evert/cop3.jpg) is what I'm talking about! :D I don't have any of those plug ends or that ferrous magnet to clear out RF..

Now I might just use a braided wire and just have the ends smoosh up against the spark plug connector end. Might have time tomorrow morning for this.....
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Old 02-21-2013, 05:44 AM   #10
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I was under the impression from various tuners and people who have dyno'd there cars on here that the Focus actually runs pretty lean from the factory and especially so with bolt-ons. Certainly not too rich.

It's one of the many reasons why people are so mad about waiting for tuning from SCT or whoever the hell finally decides to sell a solution.

I'd link to a specific thread, but at this point I think it's been discussed in like 5 at least haha!

Anyway, just something to consider.
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