Error report: 2014-05-15 14:22:34
Status: Closed

Report generated: VemsTune (Help menu/Error reporting by one-click)
Can you tell my from the logfile and config if I´m firing the injectors once per crank rev or once per engine cycle (every 2nd crank rev)
I was told that the stock ECU (same setup) is using a pulse width of 1.6ms in idle, where i see typically 3,6ms. Can this be verfied in logview ?
Or is this due to my 40%PWMing i need to do for the low-z-injectors ?
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admin 2014-05-17 05:13:51
Hello MacB,

I think i also answered this question on the forum, it seems this is not actually a bug report:

http://www.vemssupport.com/forum/index.php/topic,2286.msg22219.html#msg22219

When running Low-Z injectors, use injector driver per injector.

Using your analogy below, peak current (during peak phase), would greatly exceed the injector drivers current capability, when engine is running (and alternator charging) peak current would estimate to 14/0.7833 = 17.8 A (not counting inductance ramup effect which needs to be subtracted) in hold phase (not counting flyback losses which actually need to be added) it would be around 17.8 * 0.4 = 7.14 A.

It is imperative you change your wiring, to use 1 injector per injector driver.

Best regards, Dave

MacB 2014-05-16 04:24:12
Hi,

I´m wondering if I´m actually stressing my VEMS to much:
I drive 3 low-z injector in parallel out of one channel with 40% PWM, 2 channels with 3 injectors each

If i´m getting it right, default setup is high-z injector (>=12Ohm)
12V/12Ohm --> approx. 1A

In my setup i have 3 low-z injectors with 2,35Ohm each in parallel. -> R_total is 0.7833 Ohm
12V/0,7833Ohm*0,4 (PWM) --> 6,12A

Is that calculation right ?
Is the low-z-board / the VEMS capable of that ?
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