Mazda 13BREW with EMU black

EMU BLACK / CLASSIC
1

Hi,

I am using the EMU black on a Mazda RX7 with 13BREW rotary engine.
I’m having an issue with the trailing ignition coil outputs.

When in idle the coil for rotor 2 fires when it should fire rotor 1 and above 3000rpm it changes to be correct.
Did anybody else experience something like that or has any idea how that could happen?
Currently I’m running the engine on leading plugs only and that is working ok.

Thanks for any input,

Falko

2

What trigger do you use?

3

36-1 missing tooth with hall sensor. The trigger kit is from full function engineering. The scope looks good. What concerns me is that the behavior changing with rpm.

4

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Here my trigger settings. The hall sensor has internal pullup to 12V.
The 2 leading plugs are set up as wasted spark and for the engine settings it’s set up as a 4 cylinder with 5200cc injectors to squirt twice, but also I am having issues with the injection angle. If I turn it on to work from the table the engine won’t run.
it only runs if it’s set to start at ignition event. Is there a better way to set up the EMU for a rotary?
Currently I turned off the trailing plugs. Just validated it once more around 3500 rpm the emu will switch the outputs for the 2 trailing plugs.
I would appreciate any idea of what’s happening there and how to fix it.

5

Hi anybody any idea?
ECUmaster tech support also not answering emails.
Also the injection angle is not working for me and I would like to control it. the only way it does work is to set it to start injecting with start of ignition event.
I start to think if it was a bad idea to go with an EMUblack for a rotary engine. Seems the software is not fully supporting it.

6

I never set up an rotary engine, but dont u need to set is as a 6 cylinder (or something mulitplied by 3)?
The engine has 2 rotors?..and 3 ignition events per revolution = 6 in total.
If set as 4 cylinder the timeing i think is messed up completely.
Or am i wrong?

7

Hi,

Each rotor fires once per revolution.
Means every 180 degrees there is an ignition event. 720/180=4.
It takes 3 rounds to end up on the same rotor face.
For the leading spark plugs my timing light shows everything alright. The only trouble is with trailing plugs and the injection angle.

8

Still no one? Then it’s probably time to move on to another ECU…

9

Falko, I’ve got a word with tech support and they are looking into it.
I’m simulating and testing on my rx-7

10

Great :slight_smile: they didn’t reply me.
What trigger are you using? And can you use the injection angle tables?