EEC Analyzer is sure to explain dialing in your inj's better than I can
I will share some random stuff
so
You might wanna break out the
opcorn:
as
I might get a bit wordy here
I kinda look at working with the slope values as
Low for idle and just off idle driving conditions
High for everything above that
BUT .......... never forget
you really can't go all that high before you slip out of CL
Also ... if you change just the low or high slope ... you will see things
are effected on the other side of the breakpoint. More change closer
and less change farther away you could say
I see the breakpoint as a way to kinda influence the transition between
Low Slope and High Slope operation
The offsets can be effected by M A N Y variables :Word:
Always ... Always ... Always ...................... Remember This
You have datalogging at your disposal
The smart cookie kinda guy will use it to his advantage
Sooooooo ........... USE IT
I can use the offsets to give you a good example of how datalogging can
be such an EYE OPENER
Here is a little story showing some things I discovered .........
the hard way ........
I had been working on a CL tune for a while and was getting within
3% all up and down the line on my K's.
I had been doing my test runs in the late afternoon before dark
I made a run one evening a bit after supper and on the last half of my
15 minute run, it started to sprinkle.
I was shocked to see my K's were way off from the tight 3% results
I had been seeing
I threw the dlog in Excel for some really close scrutiny
I was able to see the headlights changed things a bit
but
It was the windshield wipers that made the K's really take a dump
This made me put dialing in my injectors on hold for a while and pursue
what I might see during different conditions as far as battery voltage
was concerned.
By datalogging, I could see the amount of battery voltage drop various
accessories caused.
By datalogging, I saw the battery voltage did not stabilize from a cold
start until between 20 to 30 minutes of operation.
See how the ability of datalogging allowed me to use hard data to tell
me why and how things could change
A lot of peeps might not get all that involved and I'm not saying they
should ... but ... I just like to see what make things tick
Story over and back to your Q's and concerns !!!
The deal about changing both low and high slope together
I did it all the time when I was far away from getting things close
but
I usually did only one at a time when I was fine tuning
The deal with CL tuning is so many variables can hose up your efforts
thus
You wanna be focused and keep the variables to a minimum
I'd use the t curve you got now
I'd use offsets for what ever size inj's you now got
That right there gets two variables out of the picture
Then ... I'd strive to get the K's to a range of 5 to 7% total variation for a
rough tune. You will use the slopes and bp for this.
I found I could get to this point fairly quickly by doing a run of 15 minutes
after a pcm reset to get some reference points for the adaptive strategy.
During this first 15 minutes ... I did not gather data but I did keep an
eye on the real time values.
After that first 15 minutes ... I duplicated the run again gathering data
This would allow me to see trends with the adaptive strategy :Word:
I repeated this procedure until I got the K's to that rough range I spoke
about above.
As you get closer ... or ... the range of where K variation diminishes ...........
You will have to do two things to be more accurate
1) Allow the pcm more time to get reference points
2) Gather data over a longer period of time
Of Course ... if you just datalog longer after a pcm reset ... 1 & 2 will
be captured all together on the same dlog.
Now say you got the higher end of the range looking kinda good with
the K's being close to 1.00 but the lower end still looks bad and the
idle is a bit unstable.
You can do several things in a situation like that
Slide the breakpoint to the left
Change the low slope
Change the offsets that are at and around idle voltage
Change the maf t curve points that are at and around idle
Other idle considerations
Have you done anything with your tb airflow scalar
Have you done anything with your isc neutral idle airflow function
Also ... Your mechanical adjustments like .............
TB blade stop screw
Bleed screw under that little rubber plug
Those can hose up the idle if they are kinda far out of adjustment
Have you got any stuff like breathers in place allowing unmetered air
Have you looked at the seal around the pcv valve cause they can get
brittle and leak around them causing an unstable idle as well
Hope some of that helps
and
If I was not all that clear on some of it ... just let me know
Grady