Dezod AEM V2 Wasted Spark to COP - Page 6 - Lexus IS Forum
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post #76 of 126 (permalink) Old 09-19-2014, 06:26 AM
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So you have no idea what gauge wire you used?

I'll tell you how I did mine and it is 100% successful.

10 gauge power wire to a relay by the battery, relay triggered by the aem. Common grounds got grounded through the brackets I made for the coils. The rest, I built a harness, 16 gauge wiring, and ran it all the way to the aem (which I have under the driver seat). Even though I was told it was unnecessary, I ran the secondary ground back to the ecu as well.

Synced timing, which was off a small amount, checked for drift and had none, and all has been well since.

I would bet you aren't giving the coils enough power. They are power hungry.

Also, timing at high rpm can cause misfires. At idle, when the engine is slow, timing can be in a wide range and still be ok. At high rpm, because things are happening so much faster, timing being off or drifting can cause some weird issues. The best of which is a misfire, the worst is melted pistons
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post #77 of 126 (permalink) Old 09-19-2014, 06:38 AM
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I used b+ off the old ignitor to power up the coils..im gonna try running direct power later on from the battery n see if that makes a difference..also ill sync it..ill let u know in abit
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post #78 of 126 (permalink) Old 09-19-2014, 06:46 AM
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That single, tiny wire off the ignitor? You need a lot more than that to power these coils.
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post #79 of 126 (permalink) Old 09-19-2014, 06:55 AM
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Yea i used b+ wire..
So should i run a relay and off the battery and use b+ just to trigger the relay ?
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post #80 of 126 (permalink) Old 09-19-2014, 06:58 AM
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That would be an option. I ran it from the aem so I could set the state of the coils off if I needed to, but my aem is integrated a little more than most
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post #81 of 126 (permalink) Old 09-19-2014, 07:32 AM Thread Starter
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Quote:
Originally Posted by mitsuguy View Post
So you have no idea what gauge wire you used?

I'll tell you how I did mine and it is 100% successful.

10 gauge power wire to a relay by the battery, relay triggered by the aem. Common grounds got grounded through the brackets I made for the coils. The rest, I built a harness, 16 gauge wiring, and ran it all the way to the aem (which I have under the driver seat). Even though I was told it was unnecessary, I ran the secondary ground back to the ecu as well.

Synced timing, which was off a small amount, checked for drift and had none, and all has been well since.

I would bet you aren't giving the coils enough power. They are power hungry.

Also, timing at high rpm can cause misfires. At idle, when the engine is slow, timing can be in a wide range and still be ok. At high rpm, because things are happening so much faster, timing being off or drifting can cause some weird issues. The best of which is a misfire, the worst is melted pistons
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That single, tiny wire off the ignitor? You need a lot more than that to power these coils.
Amen, amen, amen
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post #82 of 126 (permalink) Old 09-19-2014, 11:02 AM
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Whats best plugs for these coils ? Copper or iridium ? I know it has to be resistor type
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post #83 of 126 (permalink) Old 09-19-2014, 11:05 AM
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Doesn't really matter in terms of performance.

Longevity is the difference.

I run copper but don't mind changing them relatively often, but I also read plugs often as well.

Iridium will last much longer.
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post #84 of 126 (permalink) Old 09-19-2014, 11:45 AM
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Ran a bigger gauge wire to the power..same thing !

Tried copper plugs also..same thing !
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post #85 of 126 (permalink) Old 09-19-2014, 11:58 AM
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Aem settings?

You have the little springs inside the coil boots right?
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post #86 of 126 (permalink) Old 09-19-2014, 12:29 PM
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Aem setting are the lq9 from the wizard..increasing dwell also makes it worse...

I also syncd 100% spot on

No spring as im running msd 8.5 wires..the coils are mounted in the firewall
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post #87 of 126 (permalink) Old 09-19-2014, 12:48 PM
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post #88 of 126 (permalink) Old 09-19-2014, 01:00 PM
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If coil1 is connected to cyl1 ..2 to 2..is my phasing correct ?

Dezods phasing seems way off
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post #89 of 126 (permalink) Old 09-19-2014, 04:35 PM
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I just tried installing the coils directly on the plugs..with a spring in the coil and no luck still

Dezod...how is ur phasing not working when i have cyl1 to 1st wire..2 to 2 etc ?

Also..would i be able to install 2jzgte 6 coils and gtes big ignitor ? Supras ?
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post #90 of 126 (permalink) Old 09-20-2014, 11:05 AM
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The engine wouldn't start if your phasing was off.
I have a similar problem as yours, running 20 gap and dropped the dwell around 3.0 to solve the issue. Running 525whp at 22psi.
I too tried running more wires to have a clean power, more gnds, etc. No luck.
I don't know if there is a special feature in AEM but it seems to me like the coils are firing 2 times more often than needed (like in wasted spark) but i'm really wired 1 channel by coil with the phasing for each coil.
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