EFIDynoTuning Forum

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.

No one?

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

I had trouble with transients a few years back like you describe but it was only an issue on initial startup. I played around with it for a while and could never seem to get it to improve only make it worse. Decipha then released updated files with changes to transients and it has been better ever since without me making any changes. I still get a little lean on early tip in but its rarely noticeable, before it would really stumble before catching itself.

I just watched an old log of mine and EFTRFF does change a little. It was a short WOT log but it swings from -.04 to .06.

AEACLD in my tune is set to 1.99899. Since your using BE and not Deciphas base files I would think its possible they might not work well together.

Not sure if this will be helpful but I remember how frustrating it was for me so I thought I would at least give you a response with my experience.

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.

lean tip in on gufx has nothing to do with transient fuel its accel enrichment.

kick up the AE where you need it in the fn1303 table.

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).