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Old 10-18-2009, 12:32 PM   #1
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Default Toyota COPs and AEM EMS

So I have a 1990 ignition system on my car, and would like to convert it to the Toyota coil on plugs (I have a full set). What settings do I need to change on the AEM EMS to accommodate the new ignition?

Thanks!
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Old 10-18-2009, 02:05 PM   #2
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Below is the setup for '99~'05.

For <99, the ignition phasing teeth 1 to 4 need to be re-arranged.


Last edited by JasonC SBB; 10-18-2009 at 02:57 PM.
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Old 10-18-2009, 02:52 PM   #3
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Try this for 90~92 and non CA 93 ign phasing with COPs.
Don't forget to do ignition fine adjust to get the correct timing (which adjusts "Ignition Sync" teeth). Set it to all 10. Adjust Pickup Delay Comp so that the timing at 4000-5000 RPM is the same as at idle.


Be sure to go to Options->Coil and turn on coils 1~4 and turn off 5~10.
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Old 10-18-2009, 04:19 PM   #4
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I suppose I just wire it as it was posted in the COP thread for doing the conversion with a stock ecu(someone did a diagram on page 6 or 7).

By the way, thanks for the replies.
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Old 11-10-2009, 06:53 PM   #5
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Jason; I don't think I set any of these when I converted to Toyota COPS. Would a 96 be any different than a 99?

Thanks
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Old 11-10-2009, 10:05 PM   #6
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Are you going to run the COPs in sequential or batch fire like the OEM ECU? I think the wiring diagrams in the COP thread are for batch fire setups, at least they were the last time I read thru that thread, other than maybe tweaking the dwell curve. I posted my sequential AEM EMS settings for my '92 car when running the toyota COPS here I'd say less than a year ago. I'm pretty ---- with wiring but still swapped a few wires and ran my ignition backwards for a few hours. Fortunately nothing got damaged to my knowledge (maybe I do have some bend rods!), but definitely made a lot of very bad bad bad noises and blew off my boost gauge lines a few times backfiring out the intake.
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Old 11-10-2009, 10:51 PM   #7
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Here's the post with a screenshot of my sequential settings. The ignition teeth still seem off 180 cam deg's but it runs like that so whatever.

https://www.miataturbo.net/forum/t28029/
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Old 12-02-2009, 12:06 PM   #8
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Quote:
Originally Posted by Rafa View Post
Jason; I don't think I set any of these when I converted to Toyota COPS. Would a 96 be any different than a 99?

Thanks
Yes. To convert a 96 to COPs the only changes are to correct the dwell curves (see above), and make the ignition sequential.
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Old 04-21-2010, 05:27 PM   #9
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What I neglected to show here is the RPM vs dwell % screen.
This should be flat at 100%.

The AEM has a funny 2x factor in calculating dwell.

e.g. "coil factor" = 21 would make you think it means 2.1 ms. That would be correct.

However if the RPM and Batt volts factors multiplied produce 100%, the resulting dwell will be 4.2 ms. In order to get 2.1 ms, they should multiply to 50%.

So in my first post above, if RPM factor is at 100%, at 14.4V Batt factor is 50% ... the result will be 2.1 ms.
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