Ford sierra Cosworth 2.0l turbo

[PBU]

Here are my settings.



And another , working cosworth



You can see the difference. What's the primary first trigger tooth ?
If i put falling trigger edge the ign angle is completly off.

[Jadzwin]

Please post your scope trace from EMU.

[PBU]

Here you go.



PS: Thanks for the super support.
Never experienced such a good support.

[PBU]

This is not the scope trace with a rpm drop.
Just made it and of course all was ok .

[Jadzwin]

Thanks

You have attached log file not emuscp file...

[PBU]

This one

[PBU]

http://www.youtube.com/watch?v=dJPPE9oz0Z4

Checking injector switching.

[PBU]

Current red 500mA/div ( 1.7 amp peak ) and tension blue 5v/div from my siemens 0280150402 400cc injectors.

[Jadzwin]

Nice shot. What current probe do you use ?

[PBU]

I made a little adaptor with a 0.1 ohm resistor serial.
Better than current probe for those smal currents.
Or maybe a super expensive current probe , but i don't have


For what i read on the net i should be able to see the latency time of the injector.
But i think i need a even more expensive scope to find that detail.

Have you any data on this bosch injector ?

PS; you can see on the youtube video from above.

[Karel]

I have injector testing bench. And i can set any injection time i want in "ms" . So if i am searching for the "death" time, i increas the injector pulse time from 0,1 ms to the time when they start to spray something. Many are starting to spray at 0,6-1,1ms , but i can also see that even the same brand need sometimes 0,7 and sometimes 0,9ms to open. This also does not mean that the 0,9ms opened injector will spary less then other at 10ms pulse.... So its little bit magic, and if you build high performance engine, you alsways be safer if ouy buy for exaple 8 injectors and use 4 nearest. (most similar). In order to check all "death" times of injector you need to do measurement for each fuel pressure and each voltage what can be seen on your engine.

[PBU]

Thx Karel.

I have also read that you can see the opening from a little bump in the current rise on the graph.
I am gone take a new reading with the scope at the highest sensitivity.

[PBU]

Hello

Taken some readings on the injector tension.
First graph is the tension at the - side of the injector and GND.
The peak up and down is wide indicating there is good magnetic energy stored in the injector.


Second one is the bottem part of the first graph magnified.
What you can see is the lifting of the needle at +-1.5 msec. So the dead time (at 13.8 V ) is 1.5 msec. Quite long but maybe a consequence of the use of a serial resistor.
Also visible is the low bottom of the spike at +0.4V. Indicating there is almost no loss in the switching to GND. ( wiring+connectors+transistor in ecu )



Enjoy

Patrick

[Karel]

Patric, question is what do you mean with "opening" ? (1% or 100%)

I think that the drop in tension will be in moment when the needel hits the end of his travel. But i think, that the "death time" is much shorter than that, because the injector will start to move and spray much earlier before it hits the top position.

What do you mean ?

BTW: nice technical talk here

[PBU]

Karel,
This is defenitive the opening moment, if i am not wrong
I taken a few readings and had exactly the same result every time.

To what i know , the little bump is the result off a change in build up in magnetic field ( current and tension flow ) due to the lift of off the needle.
It's the "overcomming" off the spring force.
Of course the time from 0->100% opening is not visible here but i assume it will be very very fast as the magnetic field will be strong at this moment.

In the fall part off the graph is should be possible to see when the needle hits the base again.

Remember is use low res injectors with a 4.7 ohm serial resistor so the initial current will be "low" !
The Original Marelli ecu had a much higher , very short, start current to lift the needle very fast . +- 4amps !!

Maybe that causes the dead time to be long.

Grts
Patrick

[Jadzwin]

Here is a picture from PicoScope:



So on this picture it is clearly visible when needle starts to lift.

[Karel]

If you are "playing" so nice with good equipment..... did you compared injectors ? How far are the opening times between them ?

[Jadzwin]

It was picture for PicoScope website

[PBU]

Hi

I had found also the picoscope website.
This is the current graph , mine was the tension graph. But they both show the same magnetic proces.
The current and the " counter" tension are rising.
I have also the current graph from my Bosch injectors but the bump is not so clearly visible.



Note that the lift time is exactly the same as on the tension graph.


PS: I love electronics ( and engines )

[PBU]

Old and new.