The IC inside the CDI

[Louis]

With a proper bench, we could run good testing to see how it goes.

Its a proper bench
(I'm working on something to make it run faster, if I need to go to the higher rpm's)

Think with a correct (non wobbly) timing disc, it will be easier to see what it does

[tzr-v4]

Yes this is what I was saying 

I could do some testing with the oscilloscope to measure the timing every 500rpm step and make a libreoffice sheet to show the results.

I hope I get my TDR250 CDI soon (25€) to hack it like you did.

I'll work on a YPVS only firmware to test it.
Later we merge the 2 firmwares in one.

[davidbraith]

Hi,

Check these guys out for electronic kits and components,

http://www.rkonlinestore.co.uk/

They have some great stuff at great prices

Laters

[Louis]

Hello davidbraith,

I'm just back from a holiday, My English is not that good to write it fluently without a spell checker certainly not typed in my Phone on a hotel room
So therefore my somewhat late replay

Thanks for the link, Will investigate it.
You can see it more like, I'm trying to measure the signals neecded for this projet.
Olivier is the man for the software/firmware development.

Together with Olivier, and other forum members. We should get this thing to work.

Cheers

[Louis]

It has taken a bid longer as calculated, but finally I have the timing disk.
Its a beauty



Will try to get it mounted on my flywheel tomorrow, and see how it goes.

[tzr-v4]

Great Louis,

We'll be back on business !!!

[Louis]

I couldn't resist. Back form work, immediately to my workshop

Have setup the timing disk with the oem ic (to get the 19 degrees)
https://www.youtube.com/watch?v=byC7L3PNspY&feature=youtu.be

Second run, is with the ICP12.
https://www.youtube.com/watch?v=CN4RlDdsEu4&feature=youtu.be

Now you can see that it starts at 19 degrees (perfect) but when rpm rises it starts to go back slowly to 18 17,5 etc

Olivier,
Is it possible to program it so it holds the 19 degrees steady?

[maccas]

Louis,

That is awesome work! The 3ma1 cdi has quite alot of advance down low doesn't it! Was that with the TPS set at the 0-1/8 position?

Dan

[Louis]

Hello Dan,

Thanks, the new timing disk is much better than the previous one.

The 3ma1 cdi has quite alot of advance down low doesn't it! Was that with the TPS set at the 0-1/8 position

Yes, its has a (relative) high advance (28degree at around 3000rpm) this is with the 0 - 1/8 curve

Hope we can hold the 19 degrees steady on the iCP12, than we are good to go

Louis

[tzr-v4]

I'll try to investigate where
- calculation error can be done (approximation when between 2 points of the curve,
- time capture error (from signal edge to edge).

We'll focus on 19° steady CDI first.

[casal-fan]

I couldn't resist. Back form work, immediately to my workshop

Have setup the timing disk with the oem ic (to get the 19 degrees)
https://www.youtube.com/watch?v=byC7L3PNspY&feature=youtu.be

Louis. Great work, as usual.
On the video above.
Did you test the std. box, while reading RPM as well?
If you did, and took a note on the exact RPM when timimng hits 28*?
19*-28* is exactly what your "guesstimated" timing map sugests witk the 0-1/8 curve.
With the testing you are doing, you could now determine the accuracy of the timimng map with the 0-1/8 curve, and your "guesstimate" map would become "final"

[Paul]

wow
great work
wouldnt it be great to log all these yamaha cdi boxes so we can recreate them with the programable units

[Louis]

With the testing you are doing, you could now determine the accuracy of the timimng map with the 0-1/8 curve, and your "guesstimate" map would become "final"

That is exactly what I'm going to do

By playing back my movie, I could stop the frames at avery point (every degree)
but I had no rpm reverence (only the analog original tacho, not so accurate)

Now the idea is like this. (experimental)
I have ordered on eBay one off these.

Want to place it next to the reading point/needle on my ignition tester.
So next time I make a short movie, I could read the ignition point with the rpm.

Only point now that could destroy my plan, is that the light of the timing light is reflecting/blocking the rpm readings on the movie
Will see what happens when I have it.

Also Olivier pointed me out that there are more possibilities with the iCP12, so will investigate that to

wouldnt it be great to log all these yamaha cdi boxes so we can recreate them with the programable units

Yes, that is the plan Paul.
-Ignition curves
-pv curves
-airjet curves

But I need the time to do it all . It will come wait a bid longer

[Paul]

wouldnt it be great to log all these yamaha cdi boxes so we can recreate them with the programable units

Yes, that is the plan Paul.
-Ignition curves
-pv curves
-airjet curves

But I need the time to do it all . It will come wait a bid longer

i know its all in good hands, more people would go to prog if they could buy them programmed exactly as per OEM

[Louis]

more people would go to prog if they could buy them programmed exactly as per OEM

Its something in the far future, but if we have this iCP12 under control.
Tested and add all options.

I like to make a couple off changed 3MA CDI's fore the ones who are interested.
So you will finally have a real plug and play programmable CDI for the 3MA