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Old Tue, Jun-03-2014, 07:10:13 AM   #11
LAWLence
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Default Re: Raising idle RPM

Quote:
Originally Posted by terraphantm View Post
K_LFR_NSOLL_AC
Under what running condition would this variable be applicable? I had the values only in the temperature to idle speed maps changed to my desired RPM (above 950), and the car has been idling at that since without having changed the above without any problems.
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Old Tue, Jun-03-2014, 07:35:03 AM   #12
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Default Re: Raising idle RPM

Thanks guys!

Lawrence pointed me to 0x43E4 where there's 03E8 0398 0366 0366 (1000, 920, 870, 870 rpm, respectively).

At 0x43CA I only find one value (0366) I guess that's normal SliM3's post.

Curious to know about the 950+rpm deal too. I need ~1030-1040rpm

Thanks again!
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Old Tue, Jun-03-2014, 12:01:34 PM   #13
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Default Re: Raising idle RPM

Quote:
Originally Posted by LAWLence View Post
Under what running condition would this variable be applicable? I had the values only in the temperature to idle speed maps changed to my desired RPM (above 950), and the car has been idling at that since without having changed the above without any problems.
It's the target idle value used during pre-drive checks, referenced when running some tests in DIS/INPA, as well as, some idle sync and adapt procedures. Best to keep everything consistent even though things are running fine with just the map values changed.




For idle values 950+ you also need to adjust the starting target rpm. This is the initial 1100-1300 rpm jump when you first start the car, before it settles into its target idle; All referenced via engine temps.
@185F eng temp the starting RPM is 950, so if this is your target idle value I'd change this to 1050 or something like that (+80rpm). Maybe bump up the 86F / 1100 to 1200.

Code:
Idle Speed Control_TARGET ENGINE SPEED START  KL_LFR_NSOLL_START
F eng temp /// RPM
-22 /// 1300
86 /// 1100
185 /// 950
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Old Tue, Jun-03-2014, 04:09:48 PM   #14
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Default Re: Raising idle RPM

Quote:
Originally Posted by SliM3 View Post
It's the target idle value used during pre-drive checks, referenced when running some tests in DIS/INPA, as well as, some idle sync and adapt procedures. Best to keep everything consistent even though things are running fine with just the map values changed.




For idle values 950+ you also need to adjust the starting target rpm. This is the initial 1100-1300 rpm jump when you first start the car, before it settles into its target idle; All referenced via engine temps.
@185F eng temp the starting RPM is 950, so if this is your target idle value I'd change this to 1050 or something like that (+80rpm). Maybe bump up the 86F / 1100 to 1200.

Code:
Idle Speed Control_TARGET ENGINE SPEED START  KL_LFR_NSOLL_START
F eng temp /// RPM
-22 /// 1300
86 /// 1100
185 /// 950
I needed a target value of around 1070RPM to minimize vibration. Is there any reason to set the idle any higher than that if it's already higher than the stock values? I imagine the higher idle speeds are there at the lower temps simply for a quicker warm-up.
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Old Tue, Jun-03-2014, 04:48:44 PM   #15
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Default Raising idle RPM

Quote:
Originally Posted by LAWLence View Post
I needed a target value of around 1070RPM to minimize vibration. Is there any reason to set the idle any higher than that if it's already higher than the stock values? I imagine the higher idle speeds are there at the lower temps simply for a quicker warm-up.
There's no problem with your target idle speed selection, as you know what's best for your set-up; However the map I posted above is not your idle speed per-se. It's the initial controlled engine start speed that compensates for the large fuel pulses required at lower temps.

The 950rpm value is pretty much in the area of 'repeated hot starts', so that's the number you need to change if your target idle is 1070rpm. Can't have initial start lower than target idle or you'll probably get some sort of hunting every time you 'hot start' the car. It might even have an affect on your idle sync as well.

Hope that makes sense.
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- Checksum corrections for modified DME partial & full bin files

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- Fuel adaptations explained

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Last edited by SliM3; Tue, Jun-03-2014 at 04:55:01 PM.
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Old Tue, Jun-03-2014, 05:25:23 PM   #16
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Default Re: Raising idle RPM

Quote:
Originally Posted by SliM3 View Post
There's no problem with your target idle speed selection, as you know what's best for your set-up; However the map I posted above is not your idle speed per-se. It's the initial controlled engine start speed that compensates for the large fuel pulses required at lower temps.

The 950rpm value is pretty much in the area of 'repeated hot starts', so that's the number you need to change if your target idle is 1070rpm. Can't have initial start lower than target idle or you'll probably get some sort of hunting every time you 'hot start' the car. It might even have an affect on your idle sync as well.

Hope that makes sense.
Very valuable info, thanks! Now that I think about it, there is some degree of hunting on hot starts. It only happens for a second or so, but that makes perfect sense as the cause.
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Old Wed, Jun-04-2014, 02:19:50 AM   #17
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Default Re: Raising idle RPM

Fantastic info! Thanks!
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Old Wed, Jun-04-2014, 02:34:50 AM   #18
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Default Re: Raising idle RPM

So let me get this right. We have:

Idle Speed Control_TARGET ENGINE SPEED w/AIR READINESS K_LFR_NSOLL_AC - 0x43CA
1 value for 'standard' idle (?)

Idle Speed Control_TARGET ENGINE SPEED - BASEK_LFR_NSOLL_GRUND - 0x43E4
4 values for 'standard' idle based on temperature

Idle Speed Control_TARGET ENGINE SPEED START KL_LFR_NSOLL_START -
3 values for start-up idle based on temperature

Am I getting this right?
What offset is that last one ?
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Old Wed, Jun-04-2014, 02:42:21 AM   #19
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Default Re: Raising idle RPM

Is this possible to program if I already have an evolve tune? I contacted them to raise my idle to 1k because I have the Bimmerworld engine mounts with N/V at idle. They sent me a new file however my idle is not sticking at 1k. Am I understanding correctly that there are multiple idles that need to be programmed.
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Old Wed, Jun-04-2014, 03:02:14 AM   #20
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Default Re: Raising idle RPM

Yes Adam, it can be done regardless of tune. It's just a matter of tweaking some parameters and reflashing the car. I can help you do it if you want!
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Discussing Raising idle RPM in the Coding and Tuning Forum - Discuss all avenues of coding and tuning here! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)