End of Injector Pulse.

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End of Injector Pulse.

Postby Ken » Sun Jul 07, 2019 9:31 pm

Been away from home for some time now, so using alone time to familiarize myself with a parameter within the ls1 tunes that I find little mention of here or other forums, plus the info I've found isn't definitive.

The end of injection timing in EFILive is referenced in mS, a total of 8, and in HP tuners defined as reference periods, again in a total count of 8, leading me to think that each single unit represents 90 degrees of crank timing.
Why EFILive reference it in time (mS) makes no sense that I can rationalize as the differing crank speed means differing timing settings.

Probably spent the best part of 2 months researching this feature, one that in my opinion should be altered when aftermarket cams are used, and prior to making any other alterations in the tune, however I don't want to tune altered motors without having this option available in TunerPro.

Has anyone else here written an xdf with this feature added that is willing to share, if not, i'll keep chipping away at it til I work it out myself I guess.

My first effort at creating the entry for the 12202088 and 12225074 has resulted in editing the right area, though I'm not yet 100% sure that the math equation I've entered into the xdf is a correct representation of a feasible setting, though the EFILive example results in the correct change according to EFILive when opened with the program after editing with TunerPro.
Would love to have the tools to jack into the injector circuit and measure the differing end of timing figures myself with regards to the differing temperatures.

I have an xdf that equates the figures the same as EFILive, though I've dropped it in favour of referencing the final figures in crank degree's as in this pic below.
Thanks lads.

WH_InjTiming.PNG
WH_InjTiming.PNG (25.47 KiB) Viewed 203 times

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Re: End of Injector Pulse.

Postby antus » Mon Jul 08, 2019 5:28 pm

Dimented 24x7's 2088 XDF states

Defines the desired point at which the fuel injection pulse will be completed by. The value is the position for the current cylinders next firing pulse in degrees after the current cylinders last reference pulse. By altering the position fuel is delivered, the fuel is given sufficient time to vaporize before it is ingested."


It also has it as a 16 bit value, with equation (X/256)*(720/Y).

I would suggest you use his XDFs as they are very high quality.
Have you read the FAQ? For lots of information and links to significant threads see here: viewtopic.php?f=7&t=1396

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Re: End of Injector Pulse.

Postby The1 » Tue Jul 09, 2019 10:53 am

provided you have sufficiently larger injectors than required then you can get some benefit, as you have to squeeze the whole injection event smaller so you can shift the whole event around in that one cycle.

i did a EOI Calculator Spreadsheet here which maybe of some reference you can modify it to suit.

viewtopic.php?f=27&t=2518

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Re: End of Injector Pulse.

Postby Ken » Thu Jul 11, 2019 11:42 pm

antus wrote:Dimented 24x7's 2088 XDF states

Defines the desired point at which the fuel injection pulse will be completed by. The value is the position for the current cylinders next firing pulse in degrees after the current cylinders last reference pulse. By altering the position fuel is delivered, the fuel is given sufficient time to vaporize before it is ingested."


It also has it as a 16 bit value, with equation (X/256)*(720/Y).

I would suggest you use his XDFs as they are very high quality.

Not sure where to find those XDf's, if it's the gearhead forum, I did a quick search and only came up with a password protected XDF that equated differently from what I expected to see.
Thanks for the equation sum, I'll just work the XDF out to implement it..

The1 wrote:provided you have sufficiently larger injectors than required then you can get some benefit, as you have to squeeze the whole injection event smaller so you can shift the whole event around in that one cycle.

i did a EOI Calculator Spreadsheet here which maybe of some reference you can modify it to suit.

viewtopic.php?f=27&t=2518

Thanks for the calc, I'll definitely reference it when the time comes.
I'm more so just familiarizing myself with the option as my son's slowly buying parts for me to build him a new motor for his VY, and figured I'd get to play around and familiarize myself with this first before firing the new donk.

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