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Old 06-20-2008, 09:36 PM   #1
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Default EBC Issue

Finally got around to wiring up my EBC, and having a slight issue.

My actuator doesn't appear to be properly actuating. I was trying to tune my table, and my changes didn't have an effect on the boost levels. So I changed the entire table to 0 to see if it would hit WG boost level, and it was still going way past.

Turned off car and I set the bottom left cell in boost duty targets to 50 with the key on and listened to it and don't hear anything. I see the green Boost light in megatune turning on and off every 1/2 a second or so.

If I unplug the actuator, and plug it in, I hear it do it click, so I believe that is working.

Tested the voltage of the 12V+ souce using chasis as ground, worked fine, solid 12. Tested voltage on the connector (while BDT was set to 50), and still had 12 volts constant. Is that strange? I would think voltage would fluctuate with these settings.

Where shall I start my search? Is the megasquirt not properly changing the ground?

MSQ
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Old 06-21-2008, 12:59 AM   #2
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The fet is grounding on the heatsink.

I had the same issue.
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Old 06-21-2008, 01:28 AM   #3
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did you not follow that build update Jason?
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Old 06-21-2008, 12:43 PM   #4
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Apparently not. I used brain's build off the super important MS threads. Link to the fix?
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Old 06-21-2008, 12:49 PM   #5
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Nevermind, just remembered the thread about the megasquirts he built not working, it was in there.

thanks!
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Old 06-21-2008, 12:52 PM   #6
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it works. but there needs to be an insulator placed under the FET.

the problem i was having was that the mod kits through diyautotune i bought, didnt provide the insulator, so one i didnt know, and two some had 100K ohm resistors and not 100 ohm.

if you built the circuit like in the how-to thread, you should be good, however you still need the insulator, which you can get at radioshacks....
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Old 06-21-2008, 01:01 PM   #7
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Yeah that's what I obtained from the post. Leaving shortly for radioshack to go pick up the insulator. I didn't get one from DIY either when I purchased my mod kit...

I tested the resistors and the values were OK, so hopefully that isn't an additional issue. The grounding problem makes sense to me because of the voltage thing.
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Old 06-21-2008, 01:02 PM   #8
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You can use scotch tape for the insulator.

The mica and the fet have the same diameter hole, if you are even a little bit scewed it will ground out. But the scotch tape, you can make the hole only as big as the nylon bolt.
SOOOOO. I just put scotch tape over the mica insulator and all problems solved. Did it for my coil driving fets too, those things would short out if you just lay a finger on them before.
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Old 06-21-2008, 01:56 PM   #9
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yeah anything like that will work. electrical tape would be better.

but really they dont get hot...ive let one run at 50% dc for 25 minutes....cool to the touch.
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Old 06-21-2008, 02:46 PM   #10
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Oh well, read it too late. Ended up just buying the RS one.

Works now! Thanks for the tip sam.
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Old 06-21-2008, 02:56 PM   #11
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Such a newb.
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Old 06-21-2008, 08:02 PM   #12
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Quote:
Originally Posted by cjernigan View Post
Such a newb.
Na, noobs don't follow directions.
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