Did a tuning session this evening at the Peugeot 205, made a chip with the newest software put it in and of we went.....
Soon tuning by laptop 1-2-Spark incraesed power and torque above the original ignition, most significant is the gain of torque between 800 and 1500 rpm. 800 rpm in 5. gear and no protest at all...increasing rpm steady as it goes..... 1124cc!!!!!
a bit like an electric motor. The original ignition never did that. 5. gear only from 1400 rpm.
I'm smiling ear to ear............


some remarks

1-2-Spark runs already better than the original ignition, giving more torque and power in all rpm ranges........

Had to pump up the dwell to around 20/1000 of a second (black 2cv coil runs at 12/1000 of a second max....)

I can 't put the full potential of 1-2-spark in a distibutor-driven ignition ..... giving to much advance it outruns the contactpoints of the distributer so then the gap is to big which means no spark..... backing of the advance a little and it runs smooth.....
So when you want to take full advantige of 1-2-Spark you must run 2 double coils on a 4 cil. car (2 times 2 cilinders running wasted spark)..

Used the orignal connection for the map hose...... but it seems to be at the upper side of the butterfly, so it gives less vacuum then under the butterfly, at iddle for instance it gives no vacuum at all (this is done to compensate the mechanical advance_mechanism)
I will change this..... the 1-2-Spark mapsensor connetion will go under the butterfly


Now yesterday evening I did some programming to the advance table so now you can adjust each induvidual cel....... So the software is getting to a point also.......

So now 2 video's from this evening, the first showing the advancetable in closeup, you can see the yellow box going over the table when you rev the engine... the yellow box is the box where the engine is taking it's numbers from at that moment.... so if you need to tune you know which box you need to tune.........

http://www.youtube.com/watch?feature=pl ... 3i6NHTe29Y

The second video shows some random driving..... while monitoring everything with the laptop.....

http://www.youtube.com/watch?v=cv1V9Qlg ... e=youtu.be


I'm a happy man this evening........ This means I can run every 1, 2 and 4 cil engine at this moment!!!!!!!!!!!

Good news lpgo

Still want one when you have a spare to sell

Hi Geo - how did you work out the advance curve for the 205? Is it the same for all engines? Electronics baffle me..... give me a piece of metal and I am Ok.

Nice work Chris

@dyane61976 It seems that all engines are the same.

8 degrees at 800 rpm to 30 degrees at 3000 rpm and stay at 30 degrees for the rest of the rpm range......
Under boost you must retard ignition, under vacuum you can advance ignition for efficiency... and the engine will be running fine....

Everything else is tuning........


@Harley
First thoughts how to programm 2 coils driven on a cam sensor!!!!!!!!!

needs.......

camsensor "window" at least 10 degrees after tdc (Spark must have occured), but befor 45 degrees before tdc


coil#1 (say serving left sparkplug)
coil#2 (say serving right sparkplug)


coilflag = 0
camflag = 0

(microcontrollers work with flags)



1.revelution) 45 degrees sensor starts timer


2.revelution) 45 degrees sensor reads timer calculats spark (lets say) at 8 degrees before tdc.
8 degrees btdc coilflag = 0 so coil#1 and coil#2 fires
controller checkes camflag which is 0 so nothing to do here!!!

10 degrees after tdc camsensor comes in camflag is set to 1



3.revelution) 45 degrees sensor reads timer calculats spark at 8 degrees before tdc.
8 degrees btdc coilflag = 0 so coil#1 and coil#2 fires
controller checkes camflag which is 1 so is set back to 0 and coilflag is set to 1

no camflag this time (only once every 2 revelutions)

But if the camsensor hadn't come (at 2.revelution) then the camflag and coilflag are both 0
so then read ahead at 2. revelution


4.revelution) 45 degrees sensor reads timer calculats spark at 8 degrees before tdc.
8 degrees btdc coilflag = 1 so coil#1 fires coilflag is set to 2

10 degrees after tdc camsensor comes in camflag is set to 1


5.revelution) 45 degrees sensor reads timer calculats spark at 8 degrees before tdc.
8 degrees btdc coilflag = 2 so coil#2 fires coilflag is set to 0
controller checkes camflag which is 1 so is set back to 0 and coilflag is set to 1 (read ahead at 4.revelution)

no camflag this time (only once every 2 revelutions)

But if the camsensor wouldn't have come (at 4.revelution) then the camflag and coilflag are both 0
so then read ahead at 3. revelution



So if the camflag doesn't come in youre engine still will run (on both coils) maybe with a erorlight which will shine then.....

I THINK MY BRAIN IS FULL TODAY, sorry caps was on.

To me your theories are sound, but that doesn't help much!
I am going to run 4 independent LS1 truck coils with inbuilt ignitors, this means they only need a logic level 5volt to trigger. I am using 4 coils to run the twin spark heads but i can run 2 coils per head from 1 5v ignition output i believe...
I have recently purchased the Megasquirt 3 cpu and plan on setting it up with a 36-1 flywheel pattern and half-moon cam trigger for full sequential fuel and spark, so I had planned to email you soon for some help and advice!

Harley

Can I ask why you need 2 spark plugs per head? Are you going to do Like Alfa Romeo with main plug firing and then smaller one firing afterwards to explode any petrol/air remaining in the head?

Correct, At the time I was interested to try and make the 2cv motor as efficient as possible. I will fire both plugs at the same time which also creates more swirl in the chamber. Although as LPGO mentioned earlier in this thread, the real world benefits vs. the cost of machining and implementation probably don't add up!

Harley

Thanks for answer - would love to see photos of the heads.. I asume the extra plug is on the lower part of the head?? Could 1 coil give enough energy to fire both plugs at the same time (link the 2 cables from the plugs together?)

This means they only need a logic level 5volt to trigger. Where does it gets it dwelltime from then????

I have recently purchased the Megasquirt 3 cpu
How many 2cv engines do you want to tune in one time 4?
(I'm just jealous but as said before it is overkill)

I can't help you there to much, wenn I setup my turboengine with megasquirt
sequential wasn't working correctly, I tried it several times but in a 2cv it didn't work at all..... I don't know if it works nowadays I can only say good luck and keep reading the Megasquirt manual over and over again, you always find new/other solutions for the same problem........

This is why I'm making my own stuff nowadays, I can make it the way I like and not what others try to force me too (You know what I mean).....

And at last, please make a topic from your 2cv with lots of pics implementing Megasquirt, we are all hungry..........

At the moment I'm bussy with a profesional company to solder the units together for me.... This is getting very hot now and as it seems the price is very good....... I'm / they are going to solder 10 units as a start........... so I think within in a month from now I can please everybody!!!

I'll keep you informed........

On the other hand I am soldering a unit for user Saurus, he wants to use it for an economy run project at his university ............ Saurus please fotos of the project.......