93 RX-7 direct fire setup | AEM
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Wankel88
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Joined: 09/22/2016 - 22:45
93 RX-7 direct fire setup

Ok so im switching from the factory waste spark design that operates on 3 coils to a direct fire with 4 aem smart coils. Going over the pinouts on the diagram it shows the trailing coils to c1-11 and c1-16 which is coil 1 and 5? where the lead is c1-14 as the no.1 coil. When wiring the the smart coils which pinouts will i use for each coil. front lead, front trail, rear lead and rear trail. I will be building my own ignition harness with the connectors provided. If you have any diagrams on how that goes that would be great. If not i can source it from other forums related. Also how should the program on the infinty tuner look like for firing orders ect?

AEM_SB
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Joined: 06/07/2014 - 14:29
The Mazda Rotary application

The Mazda Rotary application notes document has some useful info, including suggested wiring diagrams:

https://www.aemelectronics.com/files/instructions/Infinity%20Supported%20Application%20Mazda%201986-2002%2013B%2020B%20Rotary%20Engine.pdf

 

I think the numbers are a bit easier to follow if you consider the possiblity of supporting a 3 rotor engine.

Coil1  (pin C1-14) = Rotor1 Leading (front)

Coil2  (pin C1-13) = Rotor2 Leading

Coil3  (pin C1-12) = Rotor3 Leading (20B only, not used for 13B)

Coil4  (pin C1-11) = Rotor1 Trailing (front)

Coil5  (pin C1-16) = Rotor2 Trailing

Coil6  (pin C1-15) = Rotor3 Trailing (20B only, not used for 13B)

 

As with any standalone ECU install, it's a very good idea to use a timing light to double-check that all coils are wired and configured correctly before you put much load on the engine. If the engine has any odd backfires or pops or very rough idling, disable the fuel pump and use the timing light when just cranking the engine (without trying to acutally run). Get a charger on the battery to avoid draining it. Some basic info here:  https://www.aemelectronics.com/forum/timing-sync-and-ignition-type-mazda-rx7  Even if your engine only has the factory timing marks, you can still move the timing light from the leading to trailing coils and eyeball that the trailing spark is happening at later angles. Also adjust the numbers in the TrailingIgnSplit map to double-check that only affects timing for the trailing coils.   For the rear rotor, you can either add another mark to the pulley using a paint pen or just eyeball that the light flashes about 180 degrees later than the front rotor.

 

Hope that helps,

SB

Wankel88
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Joined: 09/22/2016 - 22:45
That link clears up alot as i

That link clears up alot as i was using a different pdf that covered multiple vehicles and had the normal 13b setup. Would it be wise to bypass the ignition relay and use the factory supplied 12v switched wire that was intended for the oem ignitior? Or should it be used as a trigger for a new relay with a direct power setup?