Seeing that the topic had never been discussed here before, I figured it probably wouldn't spark an interest in the matter and ditched it.kojab wrote:Ken what happened to your latest post ???
I'll post it again I guess.
Been fiddling with the hsv tune in my WH for some time now, attempting to sharpen the throttle response transitioning through the 2000 rpm mark at various throttle openings, timing, mixture, VE or inj timing, couldn't give me what I was looking for, so I ventured into other areas that I'd found within the EFI live options, one which sparked an interest was the impact factor, which is stated as "Defines the fraction of fuel that will remain on the intake port wall per injection."
After adding this entry to my xdf and studying the different settings in the various factory tunes I've collected, and actually making the gains I was looking for at the 2000 rpm mark, I'm convinced it's going to be another setting I'll need to utilize whenever I do my next tune, (my sons car, motors getting rebuilt now).
I've had to revert some of the VE table changes in the 2000 range since altering this particular part of the tune.
The induction reversion noise was always louder around the 2000 rpm range, now no longer the case.
What I've seen in some of the factory tunes had me thinking that it was an under utilised part of the tune for some time, then somewhere between 2002-2003, attention was given to the entry, and all incremental options were plotted, not just a few blocks of numbers dumped into the setting.
Since the setting changes the amount of fuel that remains on the intake port wall per injection, my understanding of how that may be controlled is through varying the injection timing, and was wondering if Kojab had any insight into whether or not that was the case.
Here's some pics I'd made of the various 12225074 OS binaries..
Checking that my xdf setting shows me the same as in EFI Live. Then from around 2003, the changes were incremental, not blocks of numbers.