For tuners, a Holy Grail of Injector voltage Offset

[XfireZ51]

Marc,

As I pointed out earlier, Learn checks ON once the Open Loop AFR is commanded to be the equivalent of the O/L AFR bias in the Constants section of the calibration. Any richer than that and Learn will remain off although you could still be in Closed Loop. 170F is 77C which is right about the point where the AFR makes that transition. In colder weather it takes longer to get CTS up to 80C
And if the fans kick on, you have a situation that takes you below the 80C threshold. Need to get heat into the motor in order to maintain temp that keeps the system in C/L and Learn.

[XfireZ51]

Originally Posted by Schrade

Ok - just read the whole thread (obviously it will take several read-throughs to get it too).

In the mean time;

Should I install headers AFTER doing INJ balance test? Does it matter?

Dom - you said nothing needs be done if user has stock INJ's; what's that mean?

Do I need several C/L cycles before looking at INJ's PW? Does THAT matter?

1. No reason not to install headers

2. The values in the calibration for injector offset is for stock injectors. If that's what you have, then no need to modify cal. There's no mandatory need to change if you are using other than stock. Again, it comes down to making sure things are mechanically sound requiring minimum ECM intervention.

3. Not sure what viewing Inj. PW is supposed to do. It becomes an issue at WOT when concerned w injector Duty Cycle %. At these power levels, should be
non issue.

[XfireZ51]

Originally Posted by Schrade

Yeah - I just 'searched' here Franke; I DID do Primaries hot:

http://www.zr1.net/forum/showpost.ph...8&postcount=92

results (1')

#2 1' = 012
#5 1' = 016
#6 1' = 016
#7 1' = 016
#1 1' = 016
#3 1' = 016
#4 1' = 012
#8 1' = 016

Good point too, that you made (hesitation vs idle hunt @ 1.6 - 2.4% TO).



Dom said same thing I think, about lean tip-in, or something like that...

The point I made in the other thread is that just at the TPS% you are researching is where the ECM goes from idle state to a run state. It switches from idle timing to the SA tables. Also, depending on what's been done to the cal for the elimination of the secondary port throttle, the stock cal has a delay for the secondary injector turn on. So you are dealing with a transition point in the operation of the engine management system. Given the results of your injector resistance, I would just go ahead and put on your headers and then see where things are at. I'd also suggest taking this discussion to another thread because Injector Offset and Injector resistance values are chalk and cheese.

[XfireZ51]

Thought I'd resurrect this now that I have had a chance to try the new offset values for the Accels and do some logging/tuning. Been able to do a few runs. Came as no surprise that the initial run showed BLMs being rich. I datalogged the last one after doing a "global"reduction of fuel.The lower rpm/kPa region is still rich, particularly decel, but cruise and idle areas are coming in nicely. One observation is that the BLMs on both banks are much closer together. There still is a "split" but the variation on left to right banks is now within 7-10 counts instead of 20, ie 133-125. Still getting a few areas where the injectors just seem to shut off and where the ECM falls out of closed loop. I suspect that the O2 voltage is moving somewhere below and above the O2 C/L window settings. Usually w a blip of the throttle it jumps back into C/L and Learn. I am thinking I'll leave this alone and see if it doesn't work itself out as I get closer to good tune.
What's also interesting is how much steadier the BLMs are and how much more quickly you get to a pretty decent tune level. Finally, I suspect that with a more accurate injector PW calc, my MPG will probably improve. I could see it in the Instant MPG as I was driving this last time.

[Blue Flame Restorations]

Great work, Dom. I appreciate what you do...a lot!

[mike100]

Now that i have an Ostrich emulator box, I was considering playing around with this feature even though my BLM's are pretty close 128-131 at idle and other common cruise load cells.

The question I have is how much different are the FIC Lucas injectors to the oem ones. There was a published offset for Lucas 24 lb injectors, but a quick mental extrapolation had the values fairly close to the stock ones 9maybe that's why it runs ok with stock cams and so forth.

[XfireZ51]

Originally Posted by mike100

Now that i have an Ostrich emulator box, I was considering playing around with this feature even though my BLM's are pretty close 128-131 at idle and other common cruise load cells.

The question I have is how much different are the FIC Lucas injectors to the oem ones. There was a published offset for Lucas 24 lb injectors, but a quick mental extrapolation had the values fairly close to the stock ones 9maybe that's why it runs ok with stock cams and so forth.

Mike,

If the electrical characteristics of the injector are not different, then I'd leave it alone. The Accels OTOH are different and that needs to be accounted for. Some people use RCs. You can tune around a lot of this BUT if you start on an accurate foundation, it makes things much simpler. What is the "split" between left and right banks?