TOYOTA Celica GT4 trigger

[rob@vems.co.uk]

And get yourself some datalogs so that you can review what was happening after the cranking tests.

Rob

[Wayne]

Surprise !!!

car is running, very rough, but it's running.
The main thing what i changed was the crank
threshold rpm from 300 to 800.

Now the next challenge are wet Plugs

Battery is empty again.

Is anyone out, who knows the right dwell time for
the bosch ignition coil packs from the webshop ?

the next start is tomorow morning.

[rob@vems.co.uk]

Mate, there is a link on the webshop page to the coils:
http://www.bosch-motorsport.com/pdf/components/ignition_coils/2x2.pdf
It gives all the info you need.

[Wayne]

Yes i know,
but i set the dwell time to 3.3ms and the
max value for 6V 6.88, wich seems to be to low
for ignition.
With full battery, the value is ok.
But when the supply voltage of the coil goes down to 9V,
there is no igniton anymore.

[mattias]

At 9 Volts nothing really works ok. Your battery or your connections to the battery or between ground (engine to chassis even)  are clearly not very good. If you do a datalog (ALWAYS DATALOG, hard drive space is cheap) and check it out you can probably see that the ECU may reset during this time, look for any inconsistencies in rpm, voltage, etc..

Also, don't start your engine running flooding wet super rich. It's not a problem if you start lean, it's only idle with no load. Your rod bearings and cylinder bores  will thank you for not washing it down with fuel and wasting oil.
If your req-fuel was calculated correctly (let's assume) then you just lower the VE values of the cells in the whole region around idle by a lot.. if it's super rich but runs, you could probably cut 30-40% to get near the true value. Do make sure your lambda target table is ok before you make any changes.. it's a part of the fuel calculation.

[gunni]

From what I have seen,

idle region is almost always 40-55 if the req fuel is calculated correctly and map multiplication is enabled.

[Wayne]

Update:
engine is not running,
here is a log of my last tests.

http://www.vems.hu/files/ThomasSchragl/datalog201002102146.xls

it seems to me, that i am far away from a running engine,
the first event is in April, but there are so much trouble
to get the "Testcar" running.

[rob@vems.co.uk]

If you can run the car on the standard ECU and you have a scope, then you should be able to find out the cranking and idle pulse widths.
Make sure that you are not firing all banks when cranking - somehow you have gone from no fuel to too much fuel and a ~11ms cranking pulse shouldn't be causing this.

[Wayne]

Hy,
some good news from me, but one question:

The main error was, in one engine cycle (720 degrees) i had only two ignition events.
So i checked the "reference tooth table" and set the values 22,16,10,4.

now i had the right ignition and the engine is running.

but when i check the ignition timing with the timing light, i saw that the timing always
jumps around.
I measured at 1500rpm.

On MT the value is about 9 degrees, on the engine i saw its jumping around 10 degrees +/- 2degrees.
But i in recurring steps, the timing jumps to 30degrees for one spark and then back to 10 degrees

You can hear this bad ignition from the engine its not my timing light.

Whats the problem

attched is a log from last test.


http://www.vems.hu/files/ThomasSchragl/datalog201002160401.xls

[rob@vems.co.uk]

Can you scope the trigger with the engine running?
Are you having any trigger errors, 30 deg change sounds like a missed tooth.

You're going to have to start looking at experiments with pull-up and pull-down resistors.

I never had any luck with a Toyota trigger, sure it worked on my drill, but a running engine is a completely different matter.

[Wayne]

Thanks Rob,

i will check the trigger signals with the scope tormorrow evening.

I wired the trigger signal in two seperate cables with shieldings to the controller,
and MT tells me no trigger errors.

When i have trigger errors, can i see them in the log file ?

The problem i have is, i will install the vems in my rallye car,
and so i must come in common with the original trigger.
Because my homologation sheet gives me the hardware,
which i have to use.

[rob@vems.co.uk]

Okay, so you will need to do some extra precautionary work then, you may be wise to make yourself something like those earthing kits that the tuner boutiques sell, pulling all the grounds to a central grounding point may help with cutting down noise.

[Wayne]

Is it possible to check on megatune, when vems has a missing tooth ?

Or can i see this in the log file, or on a gauge on the megatune screen ?

[rob@vems.co.uk]

a missed tooth would show up in megatune as a trigger error, and in the data log there would be either a red line or an erratic RPM reading.

I am assuming of course that you have none of the idle control functions active - spark scatter and idle advance control would cause erratic timing.

[Wayne]

Now I measured the pulses,
the trigger pulses looks not bad,
but what is with the ignition pulse.

light blue is trigger 24 tooth
dark blue is cam trigger
purple and green are the pulses to the wasted spark coil



the cars runs I think on three cylinder and megatune tells me "missfire"

what do you think about this behavior