Like I said and what Gunzo followed with, you have to adjust both...ECU and the BISS at the same time. After my last re-tune, this is what my Tunner did and it worked. My Idle RPM is at 850, instead of 750 stock map, just enough to help with vibration and RPM dips.

 

I'm sure that mechanical adjustment can raise the idle ... but the ECU should be able to on it's own. It works on the VIII, plus the ECU controls the idle on cold starts. I have a feeling we are just missing something from the IX definitions.

 

Try disconnecting the battery for a few minutes reconnect and let the car idle for 10 minutes with the AC on.

 

I found one table last night. It looks like a "drive" table though which I think are not utilized.

 

The idle algorithm for the 9 is waaayyyy different than for the 8. For the 8, the idle algorithm is within a single subroutine. In the 9, its spread among at least 15 different subroutines, and the algorithm itself appears to be much different. I dissected it for a little while, but I have to stop now. I'll try to pick it up again this evening.

Here is the one previously undefined idle table that I found:

<table name="Some Desired Idle RPM" category="Idle" type="2D" address="3d82" flipy="true" scaling="RPM8">
<table name="Engine Temp" type="Y Axis" elements="8" address="70c2" scaling="Temp"/>
</table>

This can be inserted into the 88590015.xml file. Be sure to restart ECUFlash after inserting it. Let us know if adjusting it has any effect on idle.

 

I'll try it this evening. Thanks!

 

mrfred, you are da man.

 

anybody try it? work?

 

Alrighty .. I made some logs. Basically, the desired idle neutral, drive, and the new one Mrfred found seem to have no effect on the actual or target idle according to EvoScan. The tables I tried can be found in the "desiredIdle01.xls" file.

http://www.frameleft.com/logs/desiredIdle01.xls
http://www.frameleft.com/logs/desiredIdle01_AC.csv
http://www.frameleft.com/logs/desiredIdle02.csv
http://www.frameleft.com/logs/desiredIdle02_AC.csv

Now, I did find that the target idle RPM the ECU requests is being met almost exactly. We just need to find the tables.

 

Bump for input on logs ...

 

I haven't had a chance to look again for tables. My thought at the moment is that maybe the stepper tables need adjustment too. Have you tried making some change there just to see what happens?

 

I have not ... I don't really feel that I understand those tables enough to play with the values.

 

I need to change my rpm also to bump it up from my S1 Cam install.
With AC on and pulling up to a stop light, I take it out of gear and rpm drops too low.

So, From what I gather the ix rpm fix is still in the works?
Any help would be appreciated.
TIA

 

I got another question about this today. Mrfred, I'm sorry to bug you, but have you had a chance to look at this any further?

 

My question to this is, if the stepper tables need adjustment, why is it that the loggable "desired idle RPM" value (which seems to correspond to the name in the ROM) follows a similar curve to the tables that aren't working for adjustment. Maybe a new idle table was introduced to the IX that is separate from the auto neutral/drive maps? Did idle adjustment on the VIII require stepper adjustment? I'm just tryin to see this logically ... I have no idea how to investigate it myself.

I would assume for the AC we are looking for something similar to the adjustment on the VIII ...



This won't solve the basic idle adjustment issue, but it would be a start.

Thanks again for all that you guys do for the community!