How to controll alternator on an NB with EMS - Miata Turbo Forum - Boost cars, acquire cats.

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Old 03-17-2011, 04:35 PM   #1
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Default How to controll alternator on an NB with EMS

I am looking at getting an EMS4 since I cna get a great deal on it. The only thing that I dont know about is setting up the EMS to controll the alternator.

What are you all doing to get the EMS or EMS 4 to run the alternator?

Please remember I this will be going into a NB.

Have a great day,
Jared
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Old 03-17-2011, 05:28 PM   #2
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Most people that have DIYed their Megasquirts use a circuit designed by JasonC SBB. My own Megasquirts have a digital control circuit that does the same thing, with some additional features like a smart battery light.
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Old 03-17-2011, 05:34 PM   #3
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I just switched to an old style alternator after failing to get the PWM signal right and getting tired of messing with it. I'm happy, and I have an extra PWM output now.
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Old 03-18-2011, 04:15 PM   #4
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How hard was the swap to the old alternator? What had to be done?

Have a great day,
Jared
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Old 03-18-2011, 04:20 PM   #5
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1. Find a 95-97 alternator.
2. Install.
3. Snip one wire in your harness.
4. ???
5. Profit.
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Old 03-18-2011, 04:26 PM   #6
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Thanks brain. Didnt know it was that easy. Now which wire will have to be sniped?

Have a great day,
Jared
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Old 03-18-2011, 04:35 PM   #7
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I'd have to see my diagram, but I think the only wire that matters is the Ign+. You snip the wire that goes to the ECU. And I don't believe I connected the last one either (warning light?).
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Old 03-18-2011, 04:39 PM   #8
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there's a diagram floating around. I think leatherface25 posted a thread about it maybe levnubhin.
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Old 06-16-2011, 10:10 PM   #9
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I installed a 1.8 na alternator this last weekend when I installed my EMS 4. A PNP harness was made. Only what I needed to run the EMS is connected. Will I still haev to cut the wire? I am having some power feedback issues.

Have a great day,
Jared
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Old 06-16-2011, 11:28 PM   #10
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Quote:
Originally Posted by Braineack View Post
1. Find a 95-97 alternator.
2. Install.
3. Snip one wire in your harness.
4. ???
5. Profit.
good to know, didn't realize the 95 to 97 didn't need that circuit.
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Old 06-16-2011, 11:33 PM   #11
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Old 11-05-2013, 06:40 PM   #12
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Default alternator control

Has anyone gotten their ems4 and left the stock ecu in with connections to the alternator? I tried but I have a battery light and it only seems to charge very slowly while the car is parked...maybe because the factory ecu can't see engine speed anymore..
I know adaptronic did this so I know it's possible.
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Old 01-31-2014, 11:00 AM   #13
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Quote:
Originally Posted by jaguarcat311 View Post
Has anyone gotten their ems4 and left the stock ecu in with connections to the alternator? I tried but I have a battery light and it only seems to charge very slowly while the car is parked...maybe because the factory ecu can't see engine speed anymore..
I know adaptronic did this so I know it's possible.
The only problem with doing this is your factory ECU needs to see engine speed and things get a bit sketchy splitting your Crank and Cam signals between EMS4 and your factory ECU.

We've done it using a schottky diode (similar to the circuit Adaptronic uses) but in all honesty it's cake to just use the NA alternator.
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Old 03-12-2014, 12:44 AM   #14
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Also, wasn't somebody saying that a Toyota MR2 alt was 120 amps and a direct bolt-in? If yer gonna hafta buy one .........
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