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sddz6269 sddz6269 is offline
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Car: G20 320i
Smile Boost Much Higher Than Target in Map6 - 10-19-2020, 06:29 PM

Hi,

I'm using Map 6 with the following setting on my 2019 G20 320i:
0 @ 6.5
1.0 @ 7
1.5 @ 8
2.0 @ 10
2.5 @ 13
3.0 @ 14
3.5 @ 16
4.0 @ 16
4.5 @ 16.5
5.0 @ 17
5.5 @ 17
6.0 @ 17
6.5 @ 15.5
7.0 @ 12
The setting was provided by @KnifeEdge87, thanks man.
So yesterday I got a couple of logs and I found that my throttle was constantly partial open because of the boost over target.

From the image attached you can see that the target was set to be only 17 psi while the boost was over 19 psi. And from the log, the max boost turned out to be 20.9 psi which was way above my target, leading to a throttle closure problem.

Other than that, I found that the timing was pretty good. So could you please help explain why the boost was that high? I've also attached the log file. Thank you very much!
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Attached Files
File Type: csv P58_M6_R3_201019_2224.csv (53.6 KB, 8 views)
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KnifeEdge87 KnifeEdge87 is offline
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Car: BMW G30 520i 2019
Default 10-19-2020, 07:16 PM

Do you have the actual csv?
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sddz6269 sddz6269 is offline
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Default 10-19-2020, 08:27 PM

Quote:
Originally Posted by KnifeEdge87
Do you have the actual csv?
Yes, it was attached. I will just attach it again here.
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File Type: csv P58_M6_R3_201019_2224.csv (53.6 KB, 9 views)
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KnifeEdge87 KnifeEdge87 is offline
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Default 10-19-2020, 08:49 PM

An sorry I didn't see before

I think we should go back to an additive map unless you get an EWG harness addon

Try

1000 @ 4.0
1500 @ 4.0
2000 @ 4.5
2500 @ 5.0
3000 @ 5.7
3500 @ 6.7
4000 @ 7.2
4500 @ 7.7
5000 @ 8.0
5500 @ 7.5
6000 @ 7.0
6500 @ 6.5
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KnifeEdge87 KnifeEdge87 is offline
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Default 10-19-2020, 08:49 PM

Could you also try to do a 4th gear pull to redline in map 0?
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sddz6269 sddz6269 is offline
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Default 10-19-2020, 10:48 PM

Quote:
Originally Posted by KnifeEdge87
An sorry I didn't see before

I think we should go back to an additive map unless you get an EWG harness addon

Try

1000 @ 4.0
1500 @ 4.0
2000 @ 4.5
2500 @ 5.0
3000 @ 5.7
3500 @ 6.7
4000 @ 7.2
4500 @ 7.7
5000 @ 8.0
5500 @ 7.5
6000 @ 7.0
6500 @ 6.5
Actually I do have an EWG harness so that's why I'm very curious why the boost could not be controlled.
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sddz6269 sddz6269 is offline
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Default 10-19-2020, 10:48 PM

Quote:
Originally Posted by KnifeEdge87
Could you also try to do a 4th gear pull to redline in map 0?
Yes, I would try to do that ASAP. Thank you very much!
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KnifeEdge87 KnifeEdge87 is offline
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Default 10-19-2020, 11:03 PM

Quote:
Originally Posted by sddz6269
Actually I do have an EWG harness so that's why I'm very curious why the boost could not be controlled.
Oh that's weird then

I think for our 20i models we really need a tune

It seems there's all sorts of gremlins that are preventing us from even matching 30i level
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sddz6269 sddz6269 is offline
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Default 10-20-2020, 03:37 AM

Quote:
Originally Posted by KnifeEdge87
Oh that's weird then

I think for our 20i models we really need a tune

It seems there's all sorts of gremlins that are preventing us from even matching 30i level
I just did a 4th gear pull to redline in map 0 and found that it actually is an OEM ECU issue. In map0, the throttle could also be partially open because the ecu psi gets higher than dme bt. Dme dt is supposed to be only 0.5 bar in my model but ecu psi could rise above 0.7 bar which is pretty weird.
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File Type: csv P58_M0_R1_201020_1807.csv (25.6 KB, 7 views)
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KnifeEdge87 KnifeEdge87 is offline
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Default 10-20-2020, 03:56 AM

That's exactly the same thing I experienced

Only way around this is with a tune
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Default 10-20-2020, 07:25 AM

Quote:
Originally Posted by KnifeEdge87
That's exactly the same thing I experienced

Only way around this is with a tune
I guess a proper flash tune is the only way. But I feel like BMW did this for some reason, like, the DME BT is only set to be 0.5 bar but ECU PSI gets above 0.7 bar? That just does not make sense to me.
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Terry @ BMS's Avatar
Terry @ BMS Terry @ BMS is offline
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Default 10-20-2020, 01:56 PM

You're reading your log wrong. Manfold boost (psi2) is WELL below target because throttle is so heavily closed.

It's heavily closed because DME BT is so low.

You need to lower your target and lower FF/WGDC. You can also consider changing over to a additive map.
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sddz6269 sddz6269 is offline
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Default 10-20-2020, 10:21 PM

Quote:
Originally Posted by Terry @ BMS
You're reading your log wrong. Manfold boost (psi2) is WELL below target because throttle is so heavily closed.

It's heavily closed because DME BT is so low.

You need to lower your target and lower FF/WGDC. You can also consider changing over to a additive map.
Thank you very much Terry. Could you please explain why a low DME BT would lead to throttle closure? Cuz in my mind, throttle is controlled based on the difference between target and real boost, and JB4 is able to transfer a fake and high target so my car should actually open throttle. I guess I'm wrong?
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KnifeEdge87 KnifeEdge87 is offline
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Default 10-20-2020, 10:32 PM

Quote:
Originally Posted by sddz6269
Thank you very much Terry. Could you please explain why a low DME BT would lead to throttle closure? Cuz in my mind, throttle is controlled based on the difference between target and real boost, and JB4 is able to transfer a fake and high target so my car should actually open throttle. I guess I'm wrong?
It's like you said, an artifact of factory programming

Our 20i platform is so handicapped I think the factory engineers simply just put a hard code throttle response to artificially limit it vs the 30i

If you look at my other thread you'll see my logs where I experience the same issue and ECU PSI was never above DME BT before throttle action was taken (of course once throttle actuation occurred charge pipe boost quickly ran ahead of DME BT)

So perhaps in factory testing DME BT is so low that factory engineers found they HAD to use the throttle to limit boost in the way they wanted and couldn't only rely on the wastegate ? (pure conjecture on my part)
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VipinLJ VipinLJ is offline
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Default 10-21-2020, 05:52 PM

Quote:
Originally Posted by KnifeEdge87
It's like you said, an artifact of factory programming

Our 20i platform is so handicapped I think the factory engineers simply just put a hard code throttle response to artificially limit it vs the 30i

If you look at my other thread you'll see my logs where I experience the same issue and ECU PSI was never above DME BT before throttle action was taken (of course once throttle actuation occurred charge pipe boost quickly ran ahead of DME BT)

So perhaps in factory testing DME BT is so low that factory engineers found they HAD to use the throttle to limit boost in the way they wanted and couldn't only rely on the wastegate ? (pure conjecture on my part)
Could make sense since flash tuned 320is have same power as flash tuned 328i/330is (same stages)?


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