subaru trigger settings

[Denmark]

Here is one that finds a sulution with the megasquirt.

http://www.msextra.com/viewtopic.php?f=91&t=28092


There is was the cranktrigger that caused the sync to be out when cranking.


/Skassa

[Denmark]

Is there anyone on here that can figure out, if the subaru trigger setup is running only half of the advance that is written in megatune?

I did on my own car not measure if the advance was right over the rpm scale, but i now think that this also is wrong,
It´s just not so easy to measure, as it got cops.


/Skassa

[Denmark]

Regarding the cranking trigger noise,
we yesterday mounted 2, 50k potientometers to being able to both make pulldown, or pullup on both the cas and cam sensor,
and i have both adjusted to make pull up now, and today was the first day, that the car could start without making trigger errors,
and it started like normal, this is when both are almost at 5volt,
i have not measured the resistens yet, as i would like to try to put on some "freez spray" so i can simulate it to be really cold, as  it worse, when cold..

So this is great news 


/Skassa

[Bat]

Hi,
Errm, I going to say something and I've not got anything to back it up with, but....
When you use a timing light on a wasted spark coil pack it reads double the actual advance, so would it read half the actual advance with COP?
Cheers,
Gavin

[Denmark]

No , that´s not the problem,
as this is both on a EJ20 with cops , and and a EJ20 with wastedspark.
My timminggun, does not show dobble with wastedspark??

It is a error in the software setup, im sure.
but as i´m not a programmer, i have no glue on what to do, other then ,
I going to live with this, and not being able to map the car probbely, becourse of the lack of advance( you cant go futher then 63,25 degrees),
i can get around the problem , if i can go minus advance
Can i do that?
If so , i could strobe the engine at 30degrees, and the type -30, to get 15,
But it´s just plain stupid, it´s supposed to work,
So right now the subaru setup does NOT work
But thanks, for info.

/SKassa

[Bat]

My timminggun, does not show dobble with wastedspark??

Hi,
Some do, some don't. I know my Snap On one does and I've heard of other makes that do as well.
Cheers,
Gavin  

[rob@vems.co.uk]

Quite often the ones that have the timing offset function get confused by wasted spark as they were originally designed to fire once per cycle but see twice as many firing events, and consequently calculate the engine speed to be twice as fast it actually is... which halves the advance.

One way round this is to use a light in place of coil number 1 - as the IGBT can handle 15A you can use a pretty strong light - the trouble you may find is the speed of activation, incandesant lights have a warm-up time, so a bunch of bright white LEDs would be perfect.  Then you'd see exactly what the ECU is doing with regards to advance with none of the timing gun's second guesses confusing the issue.

Rob

[Denmark]

Okay,
But that can´t be the case here, can it?


If i crank it at, lets say 10 degrees, and the advance delay is 60, and i measure 5degrees with the timing gun, if i then move the advance delay to 65degrees, then when i measure again, it will only have moved to 7.5degrees

That would not be caused be then timing gun , would it?

/Skassa

[rob@vems.co.uk]

If the gun is flashing incorrectly because it is trying to calculate advance then yes - its getting twice the number of sparks per cycle so it thinks the engine is running at twice the speed.
The only gun worth using is the simplest one with nothing but a light.
So as we're not able to continue with your setup as it seems to have 1/2degree accuracy its got to at least be worth looking at borrowing a simple timing light from someone, just to make sure its definately not your light.

[Denmark]

the timing gun i got , is the cheapest one(freebee), and it cant do anything but flash the light, when it gets the the signal from the inductive sensor on the sparkplug cable.


/Skassa

[rob@vems.co.uk]

Okay, fair enough - you can't blame me for trying all the possabilities

[Denmark]

no and i think it´s great,


Thanks,
Skassa

[Denmark]

And the potentionmeters that i mounted burned of yesterday, so i´m back to the start problem again.

They could apperently not take the power generated at 7k rpm.

If any interest, the cam and cas sensor both measure 1.9kohm, measured a cross the terminal.

/Skassa

[rob@vems.co.uk]

Thats a high impedence vr sensor - usually I'm used to seeing 300->900Ohm sensors.
The problem with a high impedence sensor is that it starts to act like an antenna for noise

You should be able to use fixed resistors of a reasonable wattage in order to cope with the voltages at 7K and above.

Rob

[Denmark]

Okay,

we will give it a try with some different resistors!
but the problem is only there while cranking

I asked on the msextra forum, and there was one that had the same problem with the subaru trigger,his was going out of sync,(they can see when out of sync),
 but he made a change to the code, to suppress noise,and that it was not hardware related,

But that is out of my appility to fix that,but that could be the same problem Vems is having , when reading the Jap triggers.


/Skassa