OFT - Control Minimum RPMs?

[steve99]

Originally Posted by Yoshoobaroo

Can you elaborate on your idle stability tables?


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The Tables are under Timing compensation in romraider called Idle Target error range A and B

[Kodename47]

Originally Posted by steve99

The Tables are under Timing compensation in romraider called Idle Target error range A and B

You've changed those? Any idea what that does? I thought you meant the actual large idle stability tables....

[steve99]

Originally Posted by Kodename47

You've changed those? Any idea what that does? I thought you meant the actual large idle stability tables....

Afaik and it a bit hazy, amount of ignition retard\advance applied to control idle speed as it deviates from the base setting

[Spuds]

Originally Posted by steve99

The Tables are under Timing compensation in romraider called Idle Target error range A and B

Originally Posted by Kodename47

You've changed those? Any idea what that does? I thought you meant the actual large idle stability tables....

Using Kodename's defs in romraider, I have larger tables. Just looked at them today, and this definitely looks like it controls the damping function I was talking about. How it does it is related to either timing or airflow targets. Steve99, why are you thinking its timing? Numeric values seem like it could be, but do you have any other information on it?



Disclaimer: I have not messed with this yet as I do not have any idle problems. The following suggestion is based on theory, but I cannot vouch for safety or functionality of the resulting tune. I haven't been doing this as long as some of the other folks on here.

My guess is the OP is going to want to very gently increase the entries around the center top of the table. This should begin correcting the drop in RPMs more aggressively at a higher rpm.



While I am here...
Why are there so many 'idle speed target [letter]' tables? I have 9 of them and they are all different.

[steve99]

Originally Posted by Spuds

Using Kodename's defs in romraider, I have larger tables. Just looked at them today, and this definitely looks like it controls the damping function I was talking about. How it does it is related to either timing or airflow targets. Steve99, why are you thinking its timing? Numeric values seem like it could be, but do you have any other information on it?



Disclaimer: I have not messed with this yet as I do not have any idle problems. The following suggestion is based on theory, but I cannot vouch for safety or functionality of the resulting tune. I haven't been doing this as long as some of the other folks on here.

My guess is the OP is going to want to very gently increase the entries around the center top of the table. This should begin correcting the drop in RPMs more aggressively at a higher rpm.



While I am here...
Why are there so many 'idle speed target [letter]' tables? I have 9 of them and they are all different.

I think you have the wrong tables mate :-)
They are under Ignition timing Compensation, not under the logical place you look, Idle control

but both lots of tables will likely effect idle stability/compensation
Theirs just so much going on at idle, so many compensations, and they are just the ones the ecu reverse engineers have found

[Kodename47]

Originally Posted by steve99

I think you have the wrong tables mate :-)

I use the ones @Spuds posted and not the ones you suggested as they're more logical IMO

[steve99]

@Spuds

idle stability #1 and #2 tables Map

[majixmatrix]

For me it's gotten better. It'll dip to 500 RPM sometimes but no longer to the point where the lights dim...either some of the tune changes I made worked, or the engine learned but either way it's no manageable. Your posts have all been very informative and it's interesting to see how many other people have had similar issues.

[Kodename47]

So I decided to have a play, I changed:
Idle stability (from MY17)
Idle ignition timing (increased a little)
Idle MAF Targets (increased a little)
Ensured idle fuel was slightly rich (negative trims)
Overrun tables (increase throttle at lower RPM to get close to Idle MAF Targets)

Best idle yet....

[majixmatrix]

I think the overrun tables might make the most difference for me, but it's gotten so much better now that it's barely noticeable any more haha

[makinen]

Originally Posted by steve99

idle stability #1 and #2 tables Map

Hi Steve,

Your idle stability tables are good for fixing stall issue just after flashing.
Thx.

[majixmatrix]

Hey guys... I've been getting the dreaded p000b code recently. We had a cold spell down into the negatives recently, and I found that when I had to stop abruptly in traffic, the engine would start shuddering really hard. Either turning the car off then on, or giving it gas fixed the problem. Now when I get these ugly shudders at stop lights, a couple minutes later I get the p000b code and the car goes into limp mode. I reflashed the OFT Stage 2 tune today for the first time in many months, so maybe this helps? My factory warranty just ended yesterday

I'm probably going to have to put the stock header back on, reflash to stock, and drive it several hours back the dealership I bought it from. I called them up today and they seemed willing to work with me on it. This sucks so much a$$...

[majixmatrix]

Also I feel like if I could fix the idle issue when it dips low and starts shuddering, maybe I could tune out this problem? I don't have the idle overrun or the larger idle stability tables in my tune file. How can I put these in?

[Strife26]

i have Gruppe-S UEL headers, and see this happen sometimes. It doesn't bug me as my car doesn't fully stall, and my car hasn't broke, but I do have the same issue and it is usually when I neutral stop in the neighborhood I'm in.