Idle Stability / Airflow Tables

td-d · **Posted:** Thu Mar 20, 2014 5:04 pm

itp wrote:

How about for A8DH200X? I could really use the Idle Airflow Table and Idle Airflow Target Min in particular. Stability Table would be nice as well. But I'm not greedy. Haha.

Thanks

Here you go, uploaded to Github: https://raw.githubusercontent.com/TD-D/ ... DH200X.xml

itp · **Joined:** Mon May 15, 2006 12:02 am **Posts:** 39

Thank you sir! I will try it out tonight and report back. Cheers!

td-d · **Posted:** Mon Mar 24, 2014 4:46 pm

Target throttle Idle tables (and ignition overrun) now added to 32bitbase and for A8DH200X.

itp · **Joined:** Mon May 15, 2006 12:02 am **Posts:** 39

Excellent sir! Thank you. I will give these a try and report back.

BrandonspecB · **Posted:** Thu Jun 05, 2014 9:32 pm

Could I get these tables for A2UG000L?

td-d · **Posted:** Fri Jun 06, 2014 5:59 pm

A2UG000L

Code:

Throttle_Angle_Idle_Airflow_Target                  DBC04 
Throttle_Angle_Idle_Airflow_Target_Base_Min         D0AFC 
Throttle_Angle_Idle_Airflow_Target_Base_Min_App_Max CF510 
Throttle_Angle_Idle_Airflow_Target_Base_Min_X_Axis  D0A7C 
Throttle_Angle_Idle_Airflow_Target_Base_Min_Y_Axis  D0ABC 
Throttle_Angle_Idle_Airflow_Target_Y_Axis           DBBA4 

Idle_Airflow_Min_Target_Decel_Adder_A                  CFA00 
Idle_Airflow_Min_Target_Decel_Adder_A_Y_Axis           CF9C0 
Idle_Airflow_Min_Target_Decel_Adder_Active_Veh_Speed   CF1C4 
Idle_Airflow_Min_Target_Decel_Initial_Idle_Min_Airflow CF1CC 

Idle_Airflow_Min_Target_Decel_Ramping_Adder_Decreasing CF1F4 
Idle_Airflow_Min_Target_Decel_Ramping_Adder_Increasing CF1F8 

Idle_Speed_Stability        D0948 
Idle_Speed_Stability_X_Axis D08E0 
Idle_Speed_Stability_Y_Axis D0924 

BrandonspecB · **Posted:** Fri Jun 06, 2014 6:26 pm

Thanks td-d. I genuinely appreciate all your help!

MFB · **Posted:** Fri Oct 03, 2014 8:54 pm

Attached is my log and current stock stability table. Since data in the table is map correction, I just counted the instances it was logged.

How does one go about adding map correction to lessen the instances counted?

blakeforslund · **Joined:** Wed Jul 02, 2008 6:21 am **Posts:** 4

So of all these tables can someone explain in simple terms how to us it to adjust an unsteady idle or idle that falls below the set idle limit?

Heide264 · **Joined:** Sat May 07, 2011 11:22 am **Posts:** 144

I'm still having some issues with idle stability after all these years.

I tried logging a few parameters a lwhile ago, but I didn't have any luck due having the wrong parameter or scaling or whatnot.

I'm still having trouble understanding the basic logic of how these tables function collectively. It doesn't help that Cobb took down their forum post with explanations of the tables.

If somebody around here is willing to help out a bit on the assembly end (maybe I can even dust off that fancy college degree after I find a dis-assembly program), I don't mind being a test mule and summarizing what we find in a decent 'how-to'

Bamofo · **Joined:** Mon Jul 02, 2007 7:46 am **Posts:** 430

Heide264 wrote:

I'm still having some issues with idle stability after all these years.

I tried logging a few parameters a lwhile ago, but I didn't have any luck due having the wrong parameter or scaling or whatnot.

I'm still having trouble understanding the basic logic of how these tables function collectively. It doesn't help that Cobb took down their forum post with explanations of the tables.

If somebody around here is willing to help out a bit on the assembly end (maybe I can even dust off that fancy college degree after I find a dis-assembly program), I don't mind being a test mule and summarizing what we find in a decent 'how-to'

Do you already have access to the maps and just need help using them? or whats the actual ask?

I found that the idle stability tables were good in combination with Front AF Smoothing.

Those two together was what made my 07 idle correctly when i had the Front Oxy on the downpipe.

But end of the day it was never perfect... I eventually installed it in the uppipe.

ilarson007 · **Joined:** Wed Dec 05, 2012 11:00 am **Posts:** 94

Hello all. I am trying to smooth out my idle and get it so it stops dipping. I have ID1000's, and a silicone turbo inlet. (Wrote this whole post already... I have an '04 STi; A2ZJ710J.) I have recently been rescaling my CL fueling, because apparently I fixed a vacuum leak between when my tuner tuned CL and now. Fueling was way off (learned fueling of -15% in A range, and -8 to -10% in the other cells), and it's a lot closer now (however haven't driven very much yet).

Anyways, when I reset the car or flash the ECU, the idle is especially terrible before the learning starts taking affect. It will dip and nearly stall (actually, it did start stalling with this newest MAF scaling I have on it).

I guess first question: how do I log data to scale the MAFv at idle? Everything I've read says you want to throw out heat soak data, but you're obviously going to heat soak when trying to log at idle.

Second, if it's not a MAF scaling issue, then I'm wondering which of these tables discussed on the first page of this thread to attack? My tuner bumped the idle up about 200RPM; does that mean I want to change the ALPHA OverRun Fueling > Overrun fueling RPM Resume Threshold up by about 200RPM across the board? Or should I only do it at the higher ECT temps? I don't really notice the problem when the engine is cold, but most of the times it's been flashed are after it's warmed up.

Or, if not that table, do I need to adjust the ALPHA Idle Control > Idle speed stability A table?

Just looking for some direction to smooth this out. It's not too bad after learning settles in, but it's absolutely terrible before that. And the idle still dips and stumbles when I sit at a light for example.

ilarson007 · **Joined:** Wed Dec 05, 2012 11:00 am **Posts:** 94

td-d wrote:

There's another piece to the puzzle if your key issue is idle, and in particular stalling when coming to a stop. If you've raised the idle target (particularly in the scenario with larger injectors), you need to raise the injectors ability to resume fueling from an overrun mode earlier than stock (which tends to be ~900 on most roms I've worked with). In other words, if you've raised idle by 200 from say 650 to 850, you have to get the injectors firing 200 rpms earlier as a general rule.

I'm not sure if I dug those figures out for your rom, but can do it quite easily.

Also - speak to MFB about the idle stability tables - I pulled them out for his rom a couple of months back, and he's been playing with them, so he has some pointers regarding their use.

I guess specifically... do I only need to do this if my issue is the car not recovering when I push in the clutch (like, going into neutral while moving, and the car wants to die), or will this help with idle fluctuations just sitting?

ilarson007 · **Joined:** Wed Dec 05, 2012 11:00 am **Posts:** 94

td-d wrote:

BTW - there are also throttle angle idle tables (can't recall if I ever got round to publishing these) that determine target throttle angle position relative to the idle airflow target in g/s (as per these tables).

What about for A2ZJ710J?

ilarson007 · **Joined:** Wed Dec 05, 2012 11:00 am **Posts:** 94

For anyone wondering, I bumped up all the positive values in the idle stability table by 25%, and it seems to have helped a decent amount. I also increased the overrun RPM to the same delta as the stock ROM uses for every ECT cell.

What I see now is that the RPM "bounces up" maybe 100-150 RPM before settling back down (in the overrun condition). I'd rather have that then dipping down to <700.

RomRaider

Idle Stability / Airflow Tables

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