Toyota COPs and AEM EMS
#3
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.
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.
#6
Elite Member
iTrader: (9)
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,892
Total Cats: 399
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.
#7
Elite Member
iTrader: (9)
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,892
Total Cats: 399
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/
https://www.miataturbo.net/forum/t28029/
#9
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.
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.
Thread
Thread Starter
Forum
Replies
Last Post
StratoBlue1109
Miata parts for sale/trade
21
09-30-2018 01:09 PM