Chris,

Brilliant post. I tried your changes and throttle hang is all but gone - if I double-clutch on a down-shift, the hang is always gone!

Being a bit of a hacker, I'd like to fill in the blank area with knowledge; what is it about the collection of tables (new and standard) that change the behavior on down-shifts? I would never think to adjust idle tables to address a problem that occurs specifically in higher-rev ranges.

 

You never know though, sometimes when doing ecu reverse engineering they come across a table that looks like one thing but turns out another. That Idle RPM - Drive could be something else, and when changing it around, causes issues.

Right now Im working on getting the AC to not stall my car out, so thats next :P

 

Working more on that, here is what Ive found. The higher the RPM in the RPM - Drive table, the worse the hang. HOWEVER, the less prone it is to stall out when the AC is on. So Im looking for that happy medium right now. Could take me the rest of my life haha...right now im at 1297 for Drive and 1000 for neutral(I'm cammed). Its getting there.

 

Yeah, any updates on changing the table to a bunch of 30's, 40's, 65's???

 

I just tested out the Idle Stepper mod in my ecu. I only drove my car for about 5 or 10 minutes, but I THINK this just about fixed the problem. I can't believe the fix was so simple. I'll keep you all posted, but here is what I did:

Stock:


My modification:


I also started my car cold and I couldn't tell a difference between the two settings. Thanks to all who tested and posted!

Here is how I orginally described my problem about 6 months ago:

 

Something new to add .. the axis definitions are wrong

Don't know how this table can affect the other issues mentioned here though

There are more tables and base stepper values which could have been altered due to a poorly defined xml file causing you the prescribed issues ..

 

If you have time, could you explain more specifically what you mean?

 

I tried your settings smogrunner. My cold idea was a lil low, I'm kinda in the mounatins (2000elev.) and its gettin pretty cold here. anyways, I made some new settings that I will try later. Your settings did get rid of the throttle hang, though.

 

I edited this because I may have fallen victim to a placebo effect.... It seemed to be gone, but now it is back although it might be a little better; and my throttle overrun issue was pretty severe. I can tell a slight difference during cold startups, but nothing that really effects drivability.

 

I'm trying to say that alot of the definitions for the Evo branched out from the initial work done by colby .. and there's alot of assumptions going into these definitions rather than actual disassembling ..

I am only partway through the idle parameters .. and my ECU alone has more than 10 2D tables on top of what has been defined and 1 3D table not to mentioned numerous references to 1D cells .. and some of these are obvious initial startup values that will change as the ECU learns ..

Alot of the cross references use temperature as a reference base.. and I won't be surprised the idle stepper table does affect your throttle liftoffs .. but since no one dwell into the idle functions very much (except me ) there maybe things that you think you're changing to the idle functions but actually not ..

Check your pm smoggy

 

ECUFLASH is far from being perfect right now, but someday it will be more accurate. For example, the BE enrich/enlean table (the one that takes the stoich value up to like 16.1 in low load) I believe is the table used when the clutch switch (not the interlock switch, the other one that closes with clutch in) is made. The FSM states this switch causes leaning between shifts and I'm thinking the BE enrich/enlean is the map it uses.

I will have to test it one of these days to find out for sure, but I will get back on this to show what I find

 

Thanks Gunzo. Now you have pm...

 

I did the mod as per smogrunner... except that I left the last row, last column value at 160 to leave the valve open at wot.

I noticed a serious improvement in the throttle hang, but also noticed a much lower rpm at cold start idle.
So I'm wondering if this map is not something to consider as a "maximum stepper angle" ?

 

This works very well and I'm having no idle issues anywhere.

Thanks guys.

 

Same problem arises with me, throttle hang is fixed, issue with cold start just a tad.