occasional injection fail

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uffe_k
Posts: 15
Joined: Wed Jun 01, 2016 5:10 pm
Location: Southern Finland

Re: occasional injection fail

Postby uffe_k » Tue May 16, 2017 9:39 pm

I think it is more duty-cycle related than impedance related problem.
The buffer I made didn't solve errors...they do not appear so often though.
I'm working on a new intake with 550cc injectors and a blower...let's see......
Cheers Markus :shock:

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uffe_k
Posts: 15
Joined: Wed Jun 01, 2016 5:10 pm
Location: Southern Finland

Re: occasional injection fail

Postby uffe_k » Fri Sep 01, 2017 2:50 pm

This error is in the program.
It is not overcurrent in driver as the buffer circuit I made last year did not solve the problem.
With the buffer ECU "sees" bosch 12 ohm injector as 60 ohm device and then there is no chance for overcurrent.

There is just one patch missing in program...and with C++ it would go like

if ( DutyCycle > 100%) {
DutyCycle = 100%;
}

As workaround one must use so big injectors the dutycycle never reache 50% because with cold enricment and accelerator it
can still be about 90% for a short time.
Cheers....uffek

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Peterson
Posts: 141
Joined: Mon Aug 17, 2015 2:35 am

Re: occasional injection fail

Postby Peterson » Sat Sep 02, 2017 10:54 pm

For some reason your sprint doesn't like that bosch injectors your are using even tho they are high impedance.At my set-up i am using 4 high impedance (14ohm) 260cc ca18de injectors (the engine is an E15ET) at batch fire configuration BUT i have wired them at output 1 injector cylinder 1 output 2 injector cylinder 2 and so on and not two injectors per output as i was suggested.Engine works flawlessly-starts every time-no noticeable issues and it idles smoothly at mid 13's afr.

User avatar
uffe_k
Posts: 15
Joined: Wed Jun 01, 2016 5:10 pm
Location: Southern Finland

Re: occasional injection fail

Postby uffe_k » Tue Nov 09, 2021 3:01 am

Hi everyone .. I can now confirm this issue is finally solved.
I also apologize suspecting the problem being in program .. it was not.
It happened so that I lost battery connection during driving and burned my ECU ... as I described in another post.
Luckily there was only few components burned and I got it back to life.
I had noticed the injection fail happens mostly with fully charged battery which gave me a hint what is going on.
Bosch injectors were blamed before... but the problem isn't the injectors but what comes with them.
A Bosch 100+ Amp alternator. I connected oscilloscope to battery terminals and ... every now and then I saw a short spike more than 17Volts.
Most of the time it's nice 14.5V but when battery is full and there is no real load ... few millisecond spikes will occur.
I added a regulated 13.50V powersource to feed ECU and finally got rid of this seldom but annoying phenomenom.
Cheers ... Markus


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