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Old 02-18-2012, 03:02 PM   #121
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Quote:
Originally Posted by JasonC SBB View Post
How does MAPdot look?
It looks like a gold lion rampant on a field of azure, except that instead of a gold lion it's a flat line with occasional spikes corresponding to sudden increases in MAP and momentary enrichment of the fuel PW, and instead of an azure field, it's usually presented against a black background.

So, exactly like this, only completely different:

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Old 02-18-2012, 03:09 PM   #122
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Old 02-18-2012, 04:40 PM   #123
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I lol'ed....
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Old 02-18-2012, 06:00 PM   #124
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It looks like a gold lion rampant on a field of azure
Haha, I've seen 1 episode of that show, and that was the one.
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Old 02-19-2012, 11:20 AM   #125
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Joe, that joke was really lowbrau.
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Old 02-19-2012, 01:15 PM   #126
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Mmmmm. Lw Bru.

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Old 03-12-2012, 12:34 PM   #127
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Quote:
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I went with 25ms on MAP and O2, and 10ms on TPS.
https://www.miataturbo.net/showpost....43&postcount=5

Quote:
Originally Posted by Jason
Here is the effect of the same filter (without the diodes) on the TPS signal in the AEM. The time constant I used was 2x10 ms (2 pole 10 ms each).

I totally hacked up my AEM's PCB layout/grounding and fixed newbie engineer boo-boos.

The effect is much smoother throttle enrichment, most noticeably on very light throttle application at low RPM. The decel fuel cutoff also doesn't jerk in and out anymore on trailing throttle turns with very light throttle application.
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Old 04-14-2013, 09:19 AM   #128
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This thread has some excellent info on grounding. I'm thinking of using the V3.0 mainboard injector channels for directly driving a oscillating water pump for water injection. I intend to rewind an Ulka coffee machine pump for 12V operation and expect to see up to 10 amp current. Thus grounding will be important.
I like JasonC's idea of using a Schmitt trigger grounded onto the high current side. Lifting the Q1/Q5 from the mainboard ground is easily done by disconnecting the other leg of R37/R38 and running a separate ground wire from it. Naturally I will also have to connect Q14/Q15 and D17/D18 to the same ground.

My question is does it matter which ground I connect the flyback and flyback pwm -circuits to?
Also does anyone know of any dual channel schmitt triggers that would fit place of the IXDI404? I think fitting the larger 74C14 might necessitate another little auxiliary board.
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Old 04-14-2013, 12:44 PM   #129
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Schematic to which you are referring part numbers?
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Old 04-14-2013, 01:30 PM   #130
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Megasquirt 3 - V3.0 board schematics

I guess the Q3 (/Q11) flyback circuit in box with note 2 should be grounded to the high current side. Looks like I could achieve that fairly easily by lifting a couple of component legs.

However, I must say I don't fully understand how the flyback pwm circuit in box with note 3 works. Looks like it clamps the injector flyback to a maximum of about 12V. When it is active, I don't know. Anyway, R30 and R31 limit the current going through Q10, so it might be ok on the analog ground. This way the processor gets to control Q10 via fb_inj1 reliably without voltage difference in grounds.

Makes sense?

Last edited by j-po; 04-14-2013 at 03:20 PM.
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