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tkong tkong is offline
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Default N55: boost not hitting target - 04-06-2017, 02:51 PM

2011 335i n55 E40 fuel: ******* ********, bms intake, jb4 flex fuel, ppk

From my jb4 app, I see that boost isnt hitting past around 9 psi, when map 5 is trying to target ~17 psi. I assume I have a boost leak somewhere? I looked over the car briefly and didn't see anything obviously loose. I have had my chargepipe pop off but that threw the car into a low power mode, which i have not experienced yet.

I also have a 2BC0-mixture at partial load too lean code that keeps reappearing. I saw in another thread that Steve @ fuel it said it is probably because of the scalar set from my ppk. Is this something I should worry about?

Also getting 2775, 2DE3, 29D0 codes, but these haven't come back after being deleted.
Attached Files
File Type: csv 2017-04-06 16_08_29.csv (7.0 KB, 268 views)
File Type: csv 2017-04-06 13_52_23.csv (9.8 KB, 179 views)
File Type: csv 2017-04-06 15_58_29.csv (6.8 KB, 158 views)
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Default 04-06-2017, 04:43 PM

PWM is high and boost is low. So if not a boost leak then a vacuum line issue on the WG.


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Default 04-06-2017, 04:58 PM

Quote:
Originally Posted by Terry @ BMS
PWM is high and boost is low. So if not a boost leak then a vacuum line issue on the WG.
Thanks Terry for the quick response. I'll have my mechanic look over the car on a lift. Is 2BC0 related to this and if not, something i should be concerned about? Am i running too much ethanol?
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Default 04-18-2017, 11:48 AM

Just an update for future reference if anyone comes across this problem. it turned out to be a bad boost solenoid/pressure converter.
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Default 04-18-2017, 04:39 PM

Okay so i got the car back. Mechanic explained to me that he did a smoke test to look for leaks and found none. He checked the waste gate and it was working correctly. vacuum lines were fine. He finally suspected it was the boost solenoid and replaced it. After swapping that, he didn't get any more SES lights or codes.

Well on the way home from picking up the car, I decided to log on map 2 from third gear. Car had only 93. I threw a reduced power malfunction (prior to the shop visit, I had only thrown a SES light without the reduced power). Checked codes and got 2C57: reduced power mode/boost disabled.

Here is one of the logs i grabbed. First log is when the reduce power malfunction came up so i stopped. second log is a subsequent attempt after clearing codes. I tried attaching picture of my jb4 settings but i dont think its working. trying this link http://imgur.com/a/FUX0V If boost leaks and vacuum leaks are out of the question, what could i be possibly looking at now? could it be a bad diverter valve?

I took two additional logs later at night. I reset FF to 100 (per Steve in another thread i saw with similar problems). I got the same 2C57 code after two WOT runs. One was in map 2(21_27-32.csv). Second one was on map 4 (21_42_48). At least, PWM is maxed out at 99 anymore.
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Attached Files
File Type: csv 2017-04-18 17_43_34.csv (9.0 KB, 170 views)
File Type: csv 2017-04-18 21_42_48Map_4.csv (10.3 KB, 155 views)
File Type: csv 2017-04-18 21_27_32.csv (9.4 KB, 156 views)

Last edited by tkong; 04-18-2017 at 08:55 PM..
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Default 04-19-2017, 12:25 AM

Doesn't look so good and a smoke test isn't going to help much, you need to perform a pressure test.



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Default 04-19-2017, 01:06 AM

Quote:
Originally Posted by Steve @ BMS/Fuel-It!
Doesn't look so good and a smoke test isn't going to help much, you need to perform a pressure test.
do you still suspect a boost/vacuum leak? I will ask if he did a pressure test tomorrow. I find it peculiar that it went from a consistent 2775: airmass to low code to the 2C57 code after replacing the boost solenoid. I recently had my valve cover replaced as well sigh.

I also found this The 2C57 Description is "Charge-air pressure control, lower value: Boost pressure too low. Potential problem source(s):- Boost-pressure sensor defective- Defective electropneumatic pressure converter in wastegate valve- Wastegate valve is defective (seized in open position)- Air-induction tract between turbocharger and intake-air plenum has leak".

Is it worth my while to replace the boost pressure sensor? Seems like the only thing that hasn't been supposedly checked.
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Default 04-19-2017, 01:22 AM

Still looks like a leak - you need to isolate where from.

Quote:
you need to perform a pressure test
As Steve said, do this ↑


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Default 04-19-2017, 01:42 AM

Quote:
Originally Posted by keyap
Still looks like a leak - you need to isolate where from.



As Steve said, do this ↑
Yes I understand. I had it brought to a shop but Bmw tech said he couldn't find any leaks. I know he mentioned doing a smoke test, but I will clarify if he did a pressure test as well. Would make sense that the leak wouldn't show up if he only did a smoke test. Will update tomorrow.
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Default 04-19-2017, 02:02 AM

If changes are made when at the 'shop' try and grab a log whilst you are there. The fields you need to look at are 'target', 'boost' and 'PWM'. The N54tech definition of these is:-

Boost: This is the pressure, in PSI, in the charge pipe just before the throttle valve. Under ideal conditions the boost value will within 1psi of the boost set point value (see Target). The factory N54/N55 TMAP sensor is able to read up to 20psi and for reading higher boost levels up to 36psi a 3.5bar TMAP sensor is required. The 3.5 bar TMAP sensor is standard on the N20, S55, and S63tu engines. Note this value does not necessarily represent the boost pressure in your intake manifold. If the throttle body closes more than around 70% it will progressively lower the boost pressure observed by the engine, but also progressively increase the boost pressure read by the TMAP sensor and JB4 logs.
 
Target: The JB4's target boost. The value is determined by the JB4s internal mapping and many other parameters including engine speed, pedal input, intake temperature, gear, and other internal logic. Typically boost should be close to target when the turbochargers are fully spooled up. Note some systems such as the EWG JB4 applications have additive target maps. With additive maps target represents the boost added to the factory boost target rather than the absolute boost target. If you see a log with a target of 6psi or less then its like an EWG model utilizing an additive map.

PWM: Stands for pulse width modulation but is also known as wastegate duty cycle. Represents the demand for the boost signal going to the vacuum control solenoid(s). The larger the signal the more vacuum is applied to the WG (Waste Gate…. exhaust gas bypass valve) control actuator and the harder the WG plug is forced onto the WG seat. The system is designed to "fail" in the WG open position so that the engine is not subjected to high boost conditions under a failure condition, such as a broken wire or faulty output.

You need to get to the point where boost almost equals target with PWM (the amount of work done by the turbo) not maxing. If boost is below an achievable target and PWM is maxed out, you have a problem. The image below is taken from one of your logs and highlights this:-

Name:  New Picture (2).jpg
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If there are definitely no leaks you need to look at other possible causes.


UK 2011 - E82- 135i - N55 - DCT

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Default 05-01-2017, 06:04 PM

I have good and bad news. I brought the car back to shop with the specific request of a pressure test and even brought this tester along http://turboboostleaktesters.com/bmw...bo-twin-power/. They were able to pressurize the system to 18psi and found no leaks.

Subsequently, they took off my down pipe and found some play in my waste gate when they applied 6 in hg of vacuum and adjust it "by .5 inch/15 turns of the nut". I really had my doubts that this would fix anything, but at least they were nice enough to include a video lolhttps://www.youtube.com/watch?v=wwT5...ature=youtu.be

Good news is that the car is boosting slightly higher, but its still way short of target, PWM is still high. Is my next step to replace the diverter valve? Any more ideas?
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File Type: csv 2017-05-01 17_02_59Map_2.csv (8.8 KB, 149 views)

Last edited by tkong; 05-01-2017 at 06:16 PM..
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Default 05-01-2017, 06:10 PM

No easy answers. If you tested the WG and get 20" of vacuum when DWP = 100, like the vacuum line video, and can't find a boost leak anywhere, maybe the DV. Seems like a long shot though. It's normally a boost leak OR vacuum line/solenoid issue.


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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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Default 05-03-2017, 09:56 PM

I apologize for bringing this back up. I was going to put troubleshooting on hold until I got it back home to California, so I threw my car into map 0. However, in map 0, I noticed that boost was still really aggressive.

Lo and behold, I am overboosting on map 0 based off the log. Knowing that map 0 turns off the jb4, I wasn't sure if the logs were accurate so I threw it in map 4 and it was still overboosting but I had to back off during the run because of traction issues. I also did a run in map 1 to catch logs in that.

Now, I'm just really confused especially since theres no overboost codes and when comparing to my old logs in this thread. Is this indicative of a boost leak or vacuum line issue still? At this point, I just want her to be able to make it back to California next week without leaving me stranded haha.
Attached Files
File Type: csv 2017-05-03 14_23_12Map_0.csv (6.5 KB, 137 views)
File Type: csv 2017-05-03 00_02_18Map_1.csv (8.5 KB, 145 views)
File Type: csv 2017-05-03 20_29_53Map_4.csv (5.6 KB, 130 views)

Last edited by tkong; 05-03-2017 at 10:04 PM..
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Default 05-04-2017, 09:47 AM

Is your diode cut? I see you are running a PWG F-series board with E-series firmware. Not a big deal but why is that?

You definitely need to verify the diode is cut to run your current firmware.



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Default 05-04-2017, 09:59 AM

Quote:
Originally Posted by Steve @ BMS/Fuel-It!
Is your diode cut? I see you are running a PWG F-series board with E-series firmware. Not a big deal but why is that?

You definitely need to verify the diode is cut to run your current firmware.
It should be. I will double check, but this board was a replacement board that I received from you guys about a year ago. It has been working fine up until recently.

edit: just confirmed that it is cut
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Last edited by tkong; 05-04-2017 at 12:19 PM..
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Default 05-23-2017, 12:38 PM

So I just performed the vacuum line test in the video. At cold start, vacuum gauge at 15 read around 15. Once the car settled, the gauge read 10-11. I then adjusted DWP to 100 but nothing happened. I set it to 0 and the reading fell to zero.

Does this mean my boost solenoid is bad? I had it replaced a month ago, which seems odd.
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