Claudio RX-7

iTrader: (1)

I didnt say you were stupid Fritts, we can all make mistakes. My concern was that if you had it like that it was not set correctly. At any rate, the fields in the Firing Order screen dont auto correct when you switch between engine types or cylinders/rotor numbers.

One question, what is the serial number for your ECU. Im looking into the possibility of a hardware issue. I just spoke to someone with a similar situation to you, i will let you know.

Also, his engine is a 95, are you working on a 95 engine? does anybody know if the 95 engine may vary on the crank trigger disc rotational position? Maybe mazda varied it for the 95 cars?

slo

iTrader: (1)

I have a late 95 engine, it has the same trigger I have seen on any 13B-rew.

BTW, are you saying in your other post that in rotary mode the E8 fires both leading coil outputs at the same time when in direct fire mode, is that something in the newer firmware?

I know that isn't the case in the older firmware, its an easy experiment to set direct fire with a single stock style coil hooked to IG1.

Claudio RX-7

iTrader: (1)

Ok, i dont know if i was clear on the last post or not, but lets do a little recap.

If anybody can point out any incorrect information please do so, i know i dont know everything.

First, we should all remember that the leading plugs on your modern 2nd and 3rd gen motors fire together, regardless of ignition system, this is the strategy that is normally used.

If you notice in the following images (courtesy of rotaryengineillustrated.com) that the Leading plugs are firing together every 180 degrees of crank rotation.



And a quick moment later, the corresponding rotor at the compression stroke gets its Trailing plug discharged at the appropriate split angle already set in the software.



Next, comes the other rotor, 180 degrees later, and again the 2 Leading plugs are fired.



And finally, at the appropriate split angle, the 2nd Trailing plug is fired.



So... given this little bit of info, here's the difference between using Wasted Spark mode or Direct Fire mode as your spark output type. When using direct fire, the system has all 4 ignition outputs functioning, this means that you can haven an individual charge time for each one. However, when you have it set to Wasted spark, the system is only firing on 3 outputs which mean, you have either 2 single coils or 1 double connected to one single output, the deal is that since you now have only one output for 2 plugs (or 2 coils) the energy needed to maintain the same level of spark as you would using individual coils now needs to be higher, and in some instances you cant charge the module enough to generate that same spark that you could with individual outputs. The spark energy has to be divided for the 2 coils.

I hope that clears things up enough.

In the case of older first gen engines with distributors, were they fired both plugs on each rotor at the same time, 180 degrees apart, the end results (as i am told) are a loss of low end torque, apparently mazda figured out that firing both leadings at the same time, and giving the trailings a split angle, made more torque.

slo

iTrader: (1)

Claudio, the above info is not correct. In direct fire mode the leading plugs do not waste a spark. They do infact fire with the same duty cycle as the trailing.

Its real easy to test this, but I haven't done it in 1.89, here is how its done:

Using a car that has a stock style dual post lead coil, warm it up.

Set the ignition to direct fire and unplug the trail coil.

Start the car and hear it run on one rotor.

classicauto

iTrader: (3)

The 93-95 main pulley hub has a slightly different angle on the keyway vs a series 5 hub. It boils down to about 2 degrees difference between the two. If you put a S6 trigger wheel on an S5 hub, you will be advanced roughly 2 degreees.

Was that what you're asking? lol

And for direct fire mode, I've not played with it vs. wastespark but will be soon - my impression was that it fired each plug sequnetially. I understand the difference in chagre times vs. number of coils, but was under the impression that direct fire/sequential ignition would eliminate the waste sparking of the leading plugs - meanign it would fire front leading, then trailing, rear leading, then trailing...

Claudio RX-7

iTrader: (1)

Yes, my mistake! you are correct, they do fire independently when each rotor is in its compression stroke. Sorry for the miss information.

RETed

The wastespark'd leading actually doubles as a "far trailing".
So, firing it in wastespark actually fires 3 sparks per rotor face.
It's hard to see for most people...
Wastespark'd ignition actually burns a little bit cleaner due to the "FT" spark right at the end.


-Ted

t-von

iTrader: (8)

Data logging question. I've been trying to play with the feature but can't view it. I've just been selecting basic parameters so I can get familiar with it. Engine rpm, MAP, TPS, load and A/F. Problems is when I go to veiw trace, only TPS is showing. Also when I save a log and hit the view logged data button, I get 'time' is not a valid floating point. What am I missing here?

Ecu is E11v2 1.89 firmware!