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adam-
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« on: June 29, 2018, 12:28:14 AM »
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Yo,
So my idle is mint. 14.7:1 with a little walk to 14.9/14.6. Idles solidly at 800rpm (as I requested). Vac is -20.
Turn on AC and it lifts up to just about -15~ vacuum and still idles well. Turn the blows up full and vac bounces hard between -15 and -10. Really rapid oscillations. Idle is still solid at 800rpm but the gauge jumping about makes my OCD cry.
If I lift RPM up slightly with the pedal, it sits solidly at -15 vac again.
TL;DR:
> This is for ME7.5.
> can I bump idle RPM with AC on (I checked the FR and can't find anything)
> should I just make idle RPM higher because summer and AC is always on
> do something else?
> deal with it
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« Last Edit: June 29, 2018, 01:01:45 AM by adam- »
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woj
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« Reply #1 on: June 29, 2018, 12:46:24 AM »
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My ME ECU has something called NSACTM - Desired idle speed with A/C on, it is set to 840 rpm across the whole temperature range. The regular idle target at warm is engine is 750rpm.
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adam-
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« Reply #2 on: June 29, 2018, 12:48:22 AM »
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MED9?
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woj
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« Reply #3 on: June 29, 2018, 12:58:38 AM »
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The MED9.1 FR for TFSI has the description of NSAC module from page 432 on, the table NSACTM is mentioned there. Can't be bothered to check if that's the same as in my ECU..., but looking at the output variables (nsolac) seems like the thing you are after.
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adam-
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« Reply #4 on: June 29, 2018, 01:01:14 AM »
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I'll check the FR when I get home and check the defined HN file I have for it.
I doubt it'll be there. I should have clarified in the OP, this is ME7.5.
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woj
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« Reply #5 on: June 29, 2018, 01:06:08 AM »
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Oh, right... No, so mine is not MED9, ME7.9.10.
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adam-
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« Reply #6 on: September 04, 2018, 01:29:07 PM »
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Still have this as an annoyance.
The motor has a lightened flywheel. Idle is smooth at 860rpm and lambda is 14.7. Confirmed with a gauge too.
Vacuum is steady (could be slightly steadier, but I'm nit-picking) at -20. Attached is a log. First period is natural idle. Next, I add heaters, then headlights then AC. Then remove AC, headlights and heaters and let it return to a natural idle.
Also quite a big jump in AFR when I turn AC off, not sure why that is either.
So first step:
How do I smooth out vacuum when AC is on? It gets worse when I use PS.
Next step:
How do I bring AFR back down to 14.7 when just restarted and not in regulation.
Third step:
How do I stop the massive AFR spike when I turn AC on/off?
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adam-
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« Reply #7 on: September 05, 2018, 10:35:44 AM »
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My ME ECU has something called NSACTM - Desired idle speed with A/C on, it is set to 840 rpm across the whole temperature range. The regular idle target at warm is engine is 750rpm.
NSACFS for ME7.5. |
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contrast
Full Member
Karma: +20/-3
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Posts: 215
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« Reply #8 on: September 05, 2018, 11:14:26 AM »
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Injectors and MAF stock?
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userpike
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« Reply #9 on: September 07, 2018, 09:11:13 PM »
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with the lightened flywheel and lack of stored energy compared to a stock one, could you need maybe to adjust the torque reserve maps?
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adam-
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« Reply #10 on: September 08, 2018, 04:52:37 AM »
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I did, but it didn't do much. More? I tried 150/300%. Nothing.  I can't see much on idle timing either. Or wonder if the throttle PID isn't good. |
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userpike
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« Reply #11 on: September 08, 2018, 09:35:46 AM »
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I did, but it didn't do much. More? I tried 150/300%. Nothing. I can't see much on idle timing either. Or wonder if the throttle PID isn't good. before you go messing around with the throttle PID, check and see what happens to AFR with the AC off but when the fans kick on to cool the radiator. A very common issue is the fans wear out and start pulling a high load but not enough to burn the fuse. check the fans and see if they spin freely. Also check to make sure your battery isn't weak and the alt is putting out correct voltage. I suspect the fluctuations in AFR you are seeing is the ECU adapting to the change in load. One thing i did replace that made a world of difference was the cable connecting the Alt to the battery. I must say I am running with a light flywheel ( 7.5lb SPEC), along with light weight non underdrive pulleys and fluidamper balancer and have never messed with the torque reserve maps though and I don't have the problems you are having. But I did have similar issues kinda and thats when I started checkign the stuff I suggested to you above. |
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adam-
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« Reply #12 on: September 08, 2018, 09:51:08 AM »
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Fans are fine, spin fine. Battery is 6 months old and is a beast - biggest Bosch that would fit in the tray. Passat 180A alternator too. Done TB3 too.
AFR is fine tbh; it's more the boost gauge stutter. AFR still holds true, it's just like the timing/throttle is jittering.
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userpike
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« Reply #13 on: September 08, 2018, 10:00:47 AM »
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your voltage seems low under load
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adam-
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« Reply #14 on: September 08, 2018, 10:10:55 AM »
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Now that's interesting.
It's down at 12.3v once loaded up. Sometimes drops as low as 12.0. Could it be that? Stock wiring though, not sure why it's dipping so much. I'll go over the grounds but I'm sure alternator output should be strong like ox!
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