EFIDynoTuning Forum

I disabled AE and modified the transient table per this post from a certain, well known tuner. :)

https://www.eectuning.org/forums/viewto ... 908#p87684


But regardless, my lean tip-in issue is resolved and car runs quite well (better than it has in probably 15 years).

I've been working on my idle and startup air and I have hot idle pretty well dialed in.

I'm now working on startup adjustments and trying to dial in FN1861.

Random numbers here, lets say I start the car and ISC is low, so IPSIBR increases to add air eventually stabilizing at 0.2.
I know I need to increase the cells in FN1861 table, but not sure how much. Since that table is a multiplier, it's not as simple as adding 0.2. I tried that and overshot. The first couple times I overshot up and down so it either revved high for too long or low for too long. Now I'm creeping the values, but it seems like there could be an easier way to somehow use the IPSIBR value to modify the table in the specific cells.

Is there a rule of thumb for making adjustments to the FN1861 table based on IPSIBR, or is it trial and error?

Well, a member on Corral.net gave me some pointers.
The main thing was interpretation of the transient table.
I thought bigger numbers = more fuel, when actually it's the difference in values between cells.
The bigger the difference in the cells, the more fuel is added.

I dropped my lower load values and bumped the higher load values just for a test and was able to get some movement in EFTRFF values (other than 0 and 19). Needs work, but at least I finally got some movement on the transient fuel.

Oh, and for clarification, the values in my table are lb/min x 1000, so when I state 19, it's actually .019.

No one?

Anyone have a log that shows the value of the transient EFTRFF and it changing while driving?

I posted this over on eectuning, but figured I'd post here as well since I followed one of decipha's posts for setup.
Just copy and paste.

I have my car running much better after tweaking injector timing.
One small thing that's bugging me is lean tip-in.
It's usually not enough to cause issues, but every so often I'll get a stumble when AFR gets up to 16.5+.
It only last for a second or 2, but it's annoying.

I tried setting transient tuning per this post.
https://www.eectuning.org/forums/viewto ... 908#p87684

One thing I noticed when logging is that EFTRFF is almost always 0.
In my datalog for ~30 minutes I have 17k+ lines of data. There were only 70 lines that have a value for transient and all were the same value (19.5312504934009).

In my calibration (modified A9S), one scalar that has me confused is AEACLD.

AEACLD - Change in LOAD indicating that the Intake Manifold is filling. When change in load is greater than this, transient enrichment is allowed
Stock value is -0.101.

Why would this value be negative?
If that's the case, I would expect transient to be constantly changing since any bit of throttle would be greater than a negative change in load, but as mentioned, mine is almost always 0.

Got it, thanks.

I believe I set it all up per the writeup, but I'll double check.

And you might be right that it will still update, just take longer.
When I stated it updates every 7 seconds, that's after idling for a decent amount of time....I'm guessing after about 255 seconds. :)

So, I've been playing with manual idle control be keep running into an issue where ISCKAM2 keeps updating, even with UPDATM set to 255.
Looking at my logs, it's about 7 seconds between ISCKAM2 updates.

Any ideas why that's happening?
Anything else I can change to prevent updates?

I'm not able to look at tuning files on this computer, so I can't see you bin or log file.

How much did you change FN1861 table?

I noticed when I started dialing in my startup idle, I had to make bigger changes than I thought (like increments of 0.5) to get noticeable changes in the colder temp columns (100F and below).
I've since been able to make smaller increments now that I'm close to ideal.

I've been dinking around with tuning for a while, but still consider myself a novice, however, even over the last month or so, I've learned a lot of what happens with idle and why and have made huge strides in making my car idle better and more consistently.

What is your DESRPM during that high rpm phase?