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cjapodac11 cjapodac11 is offline
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Angry N20 Sensor Malfunction? - 10-14-2016, 03:29 PM

Hi, first time poster here but I'm at my wits end. Have an E92 N55 with PURE Stg 2, FBO, Jb4 with ISO, Using Burger's JB498_D0Bpump bef through Cobb AP. I recently installed the N20 TMAP sensor to utilize the higher boost values. We adjusted the setting in JB4 to N20=1, the car has not been running optimally since. Attached are logs prior to the N20, when I was hitting boost targets of 16psi+, the new logs attached i am barely hitting 10Psi on Map 5. Also, I have been frequently getting limp modes when accelerating, general 2c57 codes, as well as a 2C90 Blow-ff code. What could be causing this? Do I need to reflash the backend, or change more settings on JB4? I have increased the Duty Biases to +20, still no luck. Was very excited to get more boost out of the N20 but so far nothing but frustration. Thanks in advance.
Attached Files
File Type: csv JB4 9%2F30 map 3 (1).csv (6.1 KB, 113 views)
File Type: csv JB4 Mobile Logs.csv (8.8 KB, 121 views)
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Default 10-14-2016, 04:17 PM

Your first log does not show a value for the N20 sensor. It can't be 0.


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Default 10-14-2016, 04:21 PM

Tmap=1 for 3.5 bar n20
Tmap=2 for 4 bar sensor

"Hey guys,

Finally got our N20 TMAP sensor in. By this point it's old news but the sensor goes up to 3.5 bar and is a direct swap for our 2.5 bar sensor. Required for large single turbo guys. To install it all you need is a connector adapter so the OEM connector plugs in along with a simple JB4 firmware update. We've added settings to the G5 ISO firmware to accommodate this sensor.

You can order the adapter harness on our upgrades page and for the sensor you'll need part BMW part 13627843531. You can order that from getbmwparts.com or your favorite BMW parts supplier.

When using a 3.5bar TMAP sensor you need to set "N20 TMAP" to 1 in the JB4 interface after installing it, and also realize your FF/duty bias values will be approx 20% lower than they were with the 2.5bar factory sensor. An easy way to offset this is by adding 20 to each duty bias value across the board to keep FF within a usable range. Also note with the 3.5 bar sensor in place the in dash boost gauge has been rescaled. It will now show 0-full is 0psi to your defined boost safety setting."


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deemarr 335i deemarr 335i is offline
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Default 10-14-2016, 07:17 PM

Check connection, maybe a pushed pin
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cjapodac11 cjapodac11 is offline
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Default 10-15-2016, 03:00 PM

I have tried 2 different N20 sensors, that was my first thought is that it was defective or not connecting properly.
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cjapodac11 cjapodac11 is offline
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Default 10-15-2016, 03:03 PM

Quote:
Originally Posted by ///Mposter
Tmap=1 for 3.5 bar n20
Tmap=2 for 4 bar sensor

"Hey guys,

Finally got our N20 TMAP sensor in. By this point it's old news but the sensor goes up to 3.5 bar and is a direct swap for our 2.5 bar sensor. Required for large single turbo guys. To install it all you need is a connector adapter so the OEM connector plugs in along with a simple JB4 firmware update. We've added settings to the G5 ISO firmware to accommodate this sensor.

You can order the adapter harness on our upgrades page and for the sensor you'll need part BMW part 13627843531. You can order that from getbmwparts.com or your favorite BMW parts supplier.

When using a 3.5bar TMAP sensor you need to set "N20 TMAP" to 1 in the JB4 interface after installing it, and also realize your FF/duty bias values will be approx 20% lower than they were with the 2.5bar factory sensor. An easy way to offset this is by adding 20 to each duty bias value across the board to keep FF within a usable range. Also note with the 3.5 bar sensor in place the in dash boost gauge has been rescaled. It will now show 0-full is 0psi to your defined boost safety setting."

This is for the N54. I have an N55, which I not believe requires an adapter.
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Default 10-15-2016, 03:53 PM

Quote:
Originally Posted by cjapodac11
This is for the N54. I have an N55, which I not believe requires an adapter.
Sure does unless you have the newer style connector. The E-series N55 was available with both styles.

The sensor is "B".


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Last edited by Mike_L; 10-15-2016 at 04:02 PM..
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Default 10-15-2016, 04:28 PM

You set your duty bias all to 20. Why? Put it back to 50 and boost should go back to normal...


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Default 10-15-2016, 05:07 PM

I don't think this question merits a starting a new thread so I will ask it here. How are you guys seeing that he has no value for the tmap setting or that his duty bias is set to 20 and not 50? When I open logs the user adjustment page is always all 0's.


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Default 10-16-2016, 01:33 PM

You have to look at the CSV file...



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cjapodac11 cjapodac11 is offline
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Smile Fixed it! Thanks Terry - 10-17-2016, 02:47 PM

Changed the duty biases back to 50 and all is working well now. Anyways, you're the man!
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Default 10-17-2016, 06:21 PM

Quote:
Originally Posted by Steve @ BMS/Fuel-It!
You have to look at the CSV file...
Lol, I knew it was a dumb question but I didn't know and I have been seeing people reference these user settings for months without knowing how. Thank you.


2011 E92 335i Auto Sold
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2014 E84 X1 35i 12.75 @ 107MPH / 0-60 4.55 / 293 AWHP 305 AWTQ When stock
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Default 01-02-2018, 04:46 PM

Hi Terry: Just installed the 3.5 TMAP and am also a little confused regarding the boost curve recommendation, "An easy way to offset this is by adding 20 to each duty bias value across the board to keep FF within a usable range" Currently I am running 50 duty bias, should I NOW increase it to 70? Thanks for clearing up my confusion.
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Default 01-02-2018, 07:59 PM

That'll be fine but set FF back to default as well.



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Default 01-04-2018, 07:53 AM

Steve:

Thank you very much for the recommendation. Based on reading as much as I could find on the topic, the default FF would be 50? Appreciate your help!
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Default 01-04-2018, 11:11 AM

Default is 80 for the N54



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Default 01-04-2018, 06:06 PM

Thanks again Steve for all your help!
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Default 01-05-2018, 07:25 PM




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Ragin Cajun Ragin Cajun is offline
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Default 01-23-2018, 11:00 AM

Hi Steve: The FF was changed to the recommended 80 value and went up to 142 after a week of driving. Would this indicate a boost leak? I am not hitting the targeted boost and will change all my vacuum lines this weekend in hopes that is the issue. I changed the FF again this morning to 80 as I just installed inlets/outlets so I am hopeful it was just the ecu learning. Do you have any recommendations or am I on the right track with the vacuum line? Thanks for your advice.
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Default 01-23-2018, 07:02 PM

It's possible, there are a couple factors that can drive that up. Vacuum lines may or may not have helped.

Start a support thread and post logs.



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