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Old 06-09-2013, 07:20 PM   #1
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Default wasted spark trouble.

I'm trying to get a "non-miata" started and hit a wall, so I hope it's ok.
The ms forum guys don't even try to help most the times there.

When it says connect out-to,
ign, = D14
spr3, = D15
sp2, = D16

it means to connect
it in order like:

cyl 1-6 to ign
cyl 2-5 to sp2
cyl 3-4 to sp3
Then choose wasted spark in TS good to go?

All the logic level coils need is a 5v signal to let it know when to fire.
Megasquirt (V3.0 board) - Spark/ignition output

I used 4k7 resisters going from +5v in proto
to the top side of the D14, D15, D16
like in the diagram. Is that the way to do it?

Before it was just using a single coil driver.

I put it in test mode and see if it even fires and I can't fire the coil the
way it's hooked up and also all coil wiring is correct. It's something to do
with MS.

Any and all opinions are very welcomed.

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Old 06-11-2013, 12:01 PM   #2
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I can't help you directly, but I remember that somebody has posted a "howto" for straight-6 wasted spark on MS over on the BMW E28 forum.

check BMW E28 5-series Resource - MyE28.com in the forced induction section. "wasted spark" as a search term.
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Old 06-11-2013, 11:33 PM   #3
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Thanks stefanst.

Matt Cramer from diy answered my question on another forum.
I needed big boy 100ohm resisters instead of those.

Even though the manual says 4k7.
Thanks Matt.
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Old 06-13-2013, 09:26 AM   #4
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Did you install 4700 ohm pullup resistors? Not sure which write up you followed, but I'd expect it to call out 470 ohm, not 4700.

If those are IGN-1A coils, you will need much more pullup. Replace your 4700's with 100 ohm 1/4 watt. Those coils take a pretty strong signal to trigger.
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Old 06-13-2013, 08:51 PM   #5
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Thanks for commenting Ben.

Well I was just going off of the inaccurate MS manual
4k7 resistors.

Looking at the DIY site again, it says to use a 250-300ohm
Don't know how I missed that.

I just hope the 100ohm will give me a trouble free life. They're firing just fine btw.

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