AEM Series 1 settings with VVT and 12+1 trigger wheel - Miata Turbo Forum - Boost cars, acquire cats.

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Old 07-19-2013, 10:30 PM   #1
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Default AEM Series 1 settings with VVT and 12+1 trigger wheel

This is with waste spark and I'm using coil outputs 1 and 3 instead of 1 and 2.

The VVT map is in degrees retard; 48* is max retard, and smaller numbers advance from max retard. The 55* numbers are there to put 0 duty cycle in the solenoid. 32% duty cycle causes the advance value of the cam to hold. Less duty cycle makes it retard, more makes it advance.



The VVT setup is on VVT #2 (which uses INJ10 to connect to the VVT solenoid)

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AEM Series 1 settings with VVT and 12+1 trigger wheel-12-1-vvt-setup.gif   AEM Series 1 settings with VVT and 12+1 trigger wheel-12-1-vvt-cam-crank-wastespark-coil-output-1-3-v2.gif  

Last edited by JasonC SBB; 07-24-2013 at 01:27 PM.
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Old 07-24-2013, 12:36 PM   #2
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I was asked how to translate the above setup into one where coil outputs #1 and #2 are used instead of #1 and #3 like in my setup. (I used 3 instead of 2 due to certain hardware hacks I did)

Below I explain what the entries mean in my setup.

The AEM Series 1 has 5 ignition outputs. You need to tell it when to fire the outputs. In my setup I used coil outputs 1 and 3. So under "Setup-> Coil", I checked 1 and 3. Because I have a waste spark output, I checked 6 and 8. Add 5. i.e. #6 is the wasted spark "partner" of #1, #7 is waste spark partner of #2, and so on.

Ignition "virtual" outputs 6 through 10 are only used for waste spark setups. For COP setups you will use any four in 1 through 5 (for convenience use 1-4).

The Ign Phasing setup has entries named "Ign Tooth #xx". What it really asks is "At which tooth do I fire ignition output #xx"? I guess "Ign #xx Tooth" would have been a better label.

For a 12 or 12+1 tooth crank trigger wheel, there are 24 "teeth" in an engine cycle (2 revolutions is an engine cycle). Every 6 teeth is 180 crank degrees. The AEM has an internal counter called "fuel tooth" IIRC, which counts from 0 to 23 and back down to 0 again.

Because the engine firing order is 1,3,4,2, and the ignition pairings are 1 paired with 4, and 2 paired with 3, you want to fire the ignition outputs in this order: 1, 3, 6, 8. (remember coil virtual output 6 is actually coil output 1, and coil 8 is coil virtual output 3). So entries 1, 3, 6, 8 get 0, 6, 12, and 18 teeth.


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AEM Series 1 settings with VVT and 12+1 trigger wheel-ign-phasing-explanation.gif  

Last edited by JasonC SBB; 07-24-2013 at 01:04 PM.
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Old 07-24-2013, 12:42 PM   #3
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So if you want to modify my map to use ignition outputs 1 and 2 in a wasted spark setup, you

1) go to Setup-> coil and check 1,2,6,7 (and uncheck the rest)

2) in Ign Phasing, transfer the contents of entries 3 and 8 into 2, and 7 respectively to get below

Attached Thumbnails
AEM Series 1 settings with VVT and 12+1 trigger wheel-12-1-waste-spark-ign-outputs-1-2.gif  

Last edited by JasonC SBB; 07-24-2013 at 01:12 PM.
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Old 07-24-2013, 01:06 PM   #4
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Default 30-1710/1720 ignition phasing settings

Jason's settings work for his Honda-specific box, but S1 PnP Miata boxes (30-1710 and 30-1720) must not use injector drivers 1 or 2 when using VVT. The Miata boxes have internal jumpers between 1/2 and 9/10 that will result in a constant duty cycle being applied to one or both of those injectors when the VVT solenoid is active.

To solve this, you need to move the wiring for injectors 1 and 2 to injector drivers 5 and 6 respectively, turn off injectors 1/2 in the software, turn on injectors 5/6, copy the injection phasing settings for tooth #1 into tooth #5, and copy the injection phasing settings for tooth #2 into tooth #6.

This is not an optional modification - if you want to run a VVT in a 90-97 with an AEM S1 PnP box, you must make this wiring/settings change.
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Old 07-24-2013, 01:22 PM   #5
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Good call, I forgot about that.

The AEM use injector outputs 9 and 10 for VVT outputs 1 and 2. IOW if you use VVT #1 in the setup, you use INJ #9 for the VVT. The VVT pulsing will take over INJ #9's output. If you use VVT output #2, you use INJ #10. IOW you can't use INJ #9 output for an injector if you are using it for VVT, and ditto for INJ 10 when you use VVT #2.

Unfortunately for boxes 1710 and 1720, AEM internally jumpered (with a jumper wire hack), INJ outputs #1 to #9, and #2 to #10, in order to make the boxes compatible with 1.6 miatas with paired injectors.

An alternative to what Sav described above is to hack your box, and undo the jumper hacks that AEM did (there are 2 jumpers). Then you can use INJ outputs 1 through 4 normally, and also VVT outputs 1 and 2 (which are INJ 9 and 10).
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Old 07-24-2013, 01:26 PM   #6
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And if you have COPs here is the IGN phasing setup

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Old 07-24-2013, 10:46 PM   #7
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This thread makes is so much easier to understand. Thanks guys.
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Old 04-03-2014, 10:34 AM   #8
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Jason,

First off, let me thank you for all the great posts on setting up the AEM Series 1 for different options.

I recently installed a VVT motor into my '95 and I purchased a SuperMiata crank damper with the 12+1 trigger wheels (picture linked). I've read over this thread. If I am understanding things correct, the ECU can only handle a count up to 23 before reseting the count.

So if my assumption is correct, I need to grind one of the teeth in the upper left quadrant of the wheel to get the AEM to see everything correctly? Also, when the trigger wheel is installed, the +1 tooth is about 180 degrees from the sensor pickup. This would lead me to think I need to tweak the tooth count from what you posted in your thread.



Thanks for any help you can offer.
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Old 04-04-2014, 12:51 AM   #9
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Don't cut any teeth off! The 12+1 wheel for the SPM was built straight off our drawings, which means it's designed specifically for VVT motors in AEM-powered cars. Check your PMs or shoot me an email, I'll send you the settings you need.
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Old 04-22-2014, 11:17 PM   #10
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Thanks to Savington for settings. I was pretty painless. I believe I did find that the VVC #1 and #2 take a little different setting requirements. Savington's settings were based on the VVC #1 and I set them up on #2. It would start and immediately shut off unless I gave it a little throttle. I switched everything to VVC#1 and it runs nice and smooth.
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