ID1000's

Got mids pretty much perfect at 1.114-2.490% with a scaling of 860.

voltages are
6.01 - 3.192
7.98 - 2.472
10.03 - 1.632
12.01 - 1.200
13.99 - .960
16.04 - .672
18.02 - 0.696


But my low fuel trims are in the 6.960-7.444% range(16mins of idle and some stop and go traffic). And there don't seem to be any good write-ups on how to adjust the low trim. I used the "how to tune your evo" to get the mid's via driving and its pretty much spot on.


Any hints would be appreciated...

 

This is the procedure I used to setup my injectors and it worked great. I will note that I didn't log 16+ minutes at idle and however long driving like normally instructed. I just drove around like I normally do (mainly to and from work). Did a quick log when I got home to see what the trims were set to and adjusted accordingly. I seemed to get more consistent trims that way and I also didn't have to deal with the inconvenience of excessive idling, driving around, continuously logging. Now this way probably isn't a good idea if you have a customer's car that you need setup that day, but it only took me a couple few days to get mine setup.

1. Choose a global setting (ECUFlash injector scaling number)
2. Log trims at idle and cruise
3. If trims are roughly the same, but positive, then you need to increase your global fueling, or in terms of ECUFlash, you need to lower your injector scaling number.
4. If both trims are roughly the same, but negative, then you need to descrease your global fueling, or in terms of ECUFlash, you need to raise your injector scaling number.
5. If idle trim is more positive than cruise trim, then you need to increase the dead time, or in terms of ECUFlash, you need to increase the latency value.
6. If the idle trim is less positive than the cruise trim, you need to decrease the deadtime, or in terms of ECUFlash, you need to decrease the latency value.

NOTE: After #5 or #6, you may need to readjust #1 accordingly.

 

So I would need to decrease latency values of "all" voltages? And retest cruise...?

What happens if mids is slightly negitive(-1 to -3) and the short term is slightly positive(1-3).



Edit - Got it - Increase latency values to bring fuel trims down.

 

No, the opposite.

Your idle trims are more positive than your cruise trims. If you up the latency a bit, it is adding fuel (what your positive trims are doing). Since idle is a lower IPW than cruise, the latency adjustment should affect the idle trims more than the cruise trims. So, it should bring them both closer to 0.

 

What happens if cruise drops below 0 some and idle is slightly above? But still withing 3-4% of zero?

 

If the trims are withing + / - 5 % you are golden. Many of us shoot for even higher standards like + / - 3 %.

Keep in mind that the values will adjust over time as weather conditions change.

 

And to be sure - I should do it to ALL voltages, not just 12/14 etc right?


The sheet from ID suggests these dead times for 43.5psi base fuel pressure.

8.00 - 2.600
10.00 - 1.675
12.00 - 1.240
14.00 - .990
16.00 - .805
18.00 - not defined


My numbers are actually closer to the 40 psi base fuel pressure dead times. So if I increased the latency to these suggested numbers, wouldn't my scaling also move, likely up one notch, or more. Or am I better off leaving the scaling where I am at and just bumping up the latency a hair?

Wouldn't "both" options work? What makes one more RIGHT over the other?

 

No, you don't have to touch the scaling. The effect the latencies have on WOT fueling is negligible. The latencies have the most effect when IPW are low. The lower they are, the more effect they have.

 

What are the Hz numbers for switching between the trims? I remember seeing it somewhere but I can't remember off hand.

 

So you would not suggest inputing the 43.5 psi numbers for latency, and rescaling? Just leave scaling alone and bump up latency a hair.