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Hghw Hghw is offline
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Exclamation B48 throttle closures issue!!! - 03-28-2020, 01:37 PM

Hi there comrades!
Writing here cause i don't know what to do with trouble of my car.
B48 on F30 LCI, only with jb4 and ******* dp, works perfect about 30k miles, but some time ago i began to feel that car not pulling as before. I decide to make some logs on map 0 (stock) and that's what it is - "throttle" diagram starts pulling down from ~4500k revs and goes down while rpm is raise. So as i know "throttle" should goes up and hold from 90 to 100 units with rpms raise, linear, like that was before on all maps of jb4, even map 0.
And from that point DME boost target holding around 10-11 psi, which is not enough even for stock 330i - before boost on stock was about 15psi from 3k rpm to redline. Car not jerking or doing something weird except is noticable slower. And no other issues with car.
What i already did and what didn't help:
1. Try to use various firmware ver of jb4
2. Read fault codes - no codes
3. Use all default jb4 settings
4. Try to make log on map 1 for example - boost goes higher but throttle looks the same and car goes slower than stock

Anybody, who have the same problem, or who knows what i should to do to fix that issue, please give me advice, ill be so much grateful for this!

Logs in attach.
Attached Files
File Type: csv 2020-03-29 02_51_05_Map-0.csv (9.5 KB, 95 views)
File Type: csv map 0 gear 3.csv (9.5 KB, 83 views)

Last edited by Hghw; 03-28-2020 at 01:42 PM..
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g20-330i g20-330i is offline
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Default 03-29-2020, 02:45 AM

New to JB4 but would take a guess at a boost leak somewhere.
The actual throttle was nearly 100% open for a good portion and you weren't building much boost.

Can you not hear it hissing from the front end?
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Hghw Hghw is offline
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Default 03-29-2020, 03:23 AM

Quote:
Originally Posted by g20-330i
New to JB4 but would take a guess at a boost leak somewhere.
The actual throttle was nearly 100% open for a good portion and you weren't building much boost.

Can you not hear it hissing from the front end?
Thanks for reply mate! No weird hissing sound from hood, and i think there is no reason for this cause its all factory and nobody touching anything on intake line.
Question is why DME boost target too low, and why throttle closing.
Usually it happens when car is overboost, but there...i don't know
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g20-330i g20-330i is offline
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Default 03-29-2020, 04:42 AM

Well..
one thing I think is that the ECU PSI isn't what the ECU is requesting, it's what the JB4 shows to the ECU.
So I don't think the log means the ECU is only requesting low boost.

I wouldn't personally worry about the throttle closing right now,
the bigger problem is not even making normal boost by 4000rpm with the throttle near fully open.
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Hghw Hghw is offline
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Default 03-31-2020, 08:17 AM

Any other ideas somebody?
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B58_M240 B58_M240 is offline
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Default 05-07-2020, 01:59 PM

You're on MAP 0, which is stock. DME target and actual boost are very close. There are a lot of threads in this forum about dealing with closures; just do a search.
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Hghw Hghw is offline
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Default 06-02-2020, 02:00 AM

Quote:
Originally Posted by B58_M240
DME target and actual boost are very close.
Yes, but car is much slower than stock should be (measure it on dragy).

Issue is that if i set map 6 on 18psi flat, actual boost is lower about 2-3psi - 15-16psi, and this gap stay if i raise boost target to any other value.

Anyone have some issues with wastegate? And how it can be fix, according to fact that gate is electronic and runs by DME? I think problem with him.
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Default 06-02-2020, 03:57 PM

Looks like the throttle is closing on it's own due to boost over target even on factory tuning like the log shows. With an EWG connector on the JB4 you could remap WGDC for better control I think. Note psi2 remains on target so you can see the throttle doing what it needs to do to keep boost on target.
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Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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Hghw Hghw is offline
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Default 06-03-2020, 12:13 AM

Terry @ BMS

Thanks! But this log was made on map 0 (stock), and if i switch it to map 6 for example with 18psi flat, throttle not closing anymore (open 97% near redline), but boost still don't hot a target. Previosly also on map 6 all works correct without EWG connector. So whats going wrong? How you think?
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Hghw Hghw is offline
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Default 06-03-2020, 12:52 PM

There is the new log i made on map 6 with 20 psi flat on 3rd and a bit of 4th gears. Boost gap is about 3 psi.
If i raise targer for example to 22psi, actual boost also raise but anyway not hit the target
Attached Files
File Type: csv map 6 20psi.csv (11.7 KB, 66 views)
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Default 06-03-2020, 09:01 PM

Yes this is under targeting a bit so that helps a lot with throttle. I still think you should try out an EWG connector to control WGDC directly.
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Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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Hghw Hghw is offline
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Default 06-04-2020, 01:42 AM

Well, i think this 2-3psi (or more) varies is very noticable. You don't have any idea why this happens? And no other way to fix it except using EWG connector?
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Default 06-04-2020, 08:45 AM

Yes EWG connector is the only way to do addl tuning on it. But the log above looks fine to me.


Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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Default 06-11-2020, 04:43 AM

Terry @ BMS

The fact that you offer to buy EWG connector is good, but may be you or somebody else can explain me, why before car don't need this connector and boost perfectly hit the target (i have many logs with it), but now need this to fix the problem? May be better find a cause of problem, not solve the consequences?
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Default 06-11-2020, 01:03 PM

Let's see a log of it hitting target then.


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It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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Hghw Hghw is offline
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Default 06-11-2020, 09:40 PM

Your colleagues have already seen this logs more than year ago. No problem to post it there
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File Type: csv map 6 22 psi.csv (9.5 KB, 59 views)
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Default 06-24-2020, 01:49 AM

Terry @ BMS

So there no another advice from you at all?)
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Default 06-24-2020, 09:39 AM

IAT was higher before so the factory target was higher. Still looks as expected to me.
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Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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Default 06-25-2020, 03:21 AM

Terry @ BMS

As i think factory targer do not determine boost if im using map 6 with absolute settings (22 psi for that case), isn't it?
Anyway difference between IAT not so much that boost don't hit a targer about 2-3 psi along all revs. Still thinking what is the problem
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KnifeEdge87 KnifeEdge87 is offline
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Default 10-19-2020, 01:43 AM

Are you on a 20i or 30i platform

I have a 20i and am experiencing similar random throttle closure from about 4500rpm in gears 4 and 5 and sometimes on 3rd.
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