Do These EMS-4 Setup Values Look Right? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-11-2013, 03:06 AM   #1
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Default Do These EMS-4 Setup Values Look Right?

This is for a 94' running off the CAS. Running sequential fuel (stock injectors), wasted spark with stock coils.

I am unsure about injector phasing, ignition phasing, and wheel teeth. Can someone verify?

Thanks!
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Old 09-11-2013, 09:12 AM   #2
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i'm only qualified to say anything when I'm working on my car and it's fresh in my head and I have my notebook open, otherwise I forget things fast, so that said...

I assume "coil xB" is the wasted spark version of "coil x"? If so, you only have tooth 0 & 1 accounted for. You need to have 2 & 3 in there, otherwise nothing will happen ignition wise on those 2 teeth. As you have it, both coils fire on teeth 0 & 1 at the same time, and 0 & 1 only, ut oh.

Your fuel teeth don't follow the ignition firing order of 1,3,4,2. As is, you are firing the injectors in this order: 1,3,2,4. The engine will run, but...

I think on my series 1, the fuel teeth should be 2 teeth off the ignition teeth (360crank degrees off).
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Old 09-11-2013, 12:36 PM   #3
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The fuel inj phase was copied over from the series 1 base map for the 94-95 miata, I noticed it didn't follow firing order so maybe the settings don't translate to the newer ecu. So should both Inj and coil phase read the same then (1=1,2=4,3=2,4=3)?. Also what the heck sets injection timing?

I am used to motec/megasquirt/performance electronics, AEM seems to handle cam/crank triggering so different so I'm having a tough time.


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Originally Posted by TurboTim View Post
i'm only qualified to say anything when I'm working on my car and it's fresh in my head and I have my notebook open, otherwise I forget things fast, so that said...

I assume "coil xB" is the wasted spark version of "coil x"? If so, you only have tooth 0 & 1 accounted for. You need to have 2 & 3 in there, otherwise nothing will happen ignition wise on those 2 teeth. As you have it, both coils fire on teeth 0 & 1 at the same time, and 0 & 1 only, ut oh.

Your fuel teeth don't follow the ignition firing order of 1,3,4,2. As is, you are firing the injectors in this order: 1,3,2,4. The engine will run, but...

I think on my series 1, the fuel teeth should be 2 teeth off the ignition teeth (360crank degrees off).
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Old 09-16-2013, 05:23 PM   #4
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Can anyone that's running an ems 4 with a stock engine take screenshots of their setup for me?
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Old 09-19-2013, 01:52 PM   #5
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Got an awesome answer from AEM directly, so I should be good to go. Once I get the engine running in a week or two I'll make a nice base map and post it up here so others don't have to go through the whole process again
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