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Can someone verify Correct spark output?

Old 11-29-2007, 12:35 AM
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Default Can someone verify Correct spark output?

I have to constantly be messing with something electronic, this damn megasquirt project got me stuck on it. That said I decided to pull the case back off my megasquirt and verify that I wired everything up correctly for the two inputs from CAS and two spark outputs. From the beginning I believe I used DIYautotunes mods, but I did the mod a long time ago before v3.0 was released if I remember correctly.

Anyway I'm planning on using the stock 1995 Miata coil packs. So what I did was removed the transistor from Q9 and Q11, from the ouput side of R25 I soldered on a wire and ran it to X13 for coil number one. Output side of R28 to X12 for coil number two.

Thats all I remember it telling me I needed to do, but now I look at their site and the redirect to a Neon site tells me I need to use some transistors or something? Ack! I'm confused, just want to make sure this is all right before I Blow something up. Now I'm really getting paranoid. The input section is perfect, I've checked that like 11tybillion times now.

MSnS-E 029q2 v2.2 MS-I
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Old 11-29-2007, 09:18 AM
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Back in the day when I first did a megasquirt on my 90 the only way I could get it to run was what you described. So, you must have copied my instructions, that mod should work for the 95 coils as well.
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Old 11-29-2007, 09:50 AM
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spark output must be inverted if running without the resistors, else you'll burn out the ignitors.

It also proved to be a more unstable signal, imho, i never had a smooth idle, and always had misses. Reverting to DIY's method, using the transitors and taking the signal off the LEDs, my idle became much smoother and misfires are a thing of the past. Spark output signal must be reverted to non-inverted
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Old 11-29-2007, 11:59 AM
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So you would defiantly recommend grabbing the transistors/resistors and using them to trigger the ignitors?
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Old 11-29-2007, 12:11 PM
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yes. you can buy the transistors and 1k resistors at radioshack for about $4.

install the transistors, then jump, IIRC (dont hold me to it), r23 (closest to transitor) to the - labeled side of the LED, and r27 the same.

run the outputs from the same resistor/LED spot to your x13 and x12.



like this:




remember, non-inverted spark output.

Last edited by Braineack; 11-29-2007 at 12:25 PM.
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Old 11-29-2007, 12:12 PM
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Do the DIYautotune mods and use their settings. They work, they're stable, and everyone else is running them with 100% success.
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