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CristianL1 CristianL1 is offline
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Default JB4 app giving me wrong lpfp reading. - 09-14-2019, 08:39 PM

So after installing new fuel pump & new fuel pressure sensor. JB4 app is still giving me a fuel pressure of 65 at idle. So I decided to use pro tool from bimmergeeks to read my lpfp pressure & at idle with jb4 on map 0 itís a steady 72psi. What could cause my JB4 app to not read my fuel pressure correctly? Logs all look good now with the new pump & sensor but confused why the reading is different compared to other app.

Thank you!
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Default 09-15-2019, 09:57 AM

Log?

Usually it’s pretty accurate, could be a tired EKP



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Default 09-15-2019, 06:58 PM

Quote:
Originally Posted by CristianL1
So after installing new fuel pump & new fuel pressure sensor. JB4 app is still giving me a fuel pressure of 65 at idle. So I decided to use pro tool from bimmergeeks to read my lpfp pressure & at idle with jb4 on map 0 it’s a steady 72psi. What could cause my JB4 app to not read my fuel pressure correctly? Logs all look good now with the new pump & sensor but confused why the reading is different compared to other app.

Thank you!
I am just trying to troubleshoot the EXACT same issue...
I have a spare EKPM3 module running the exact same ZB number 7276383) and tried replacing it with the exact same results.

I am running a trebila custom bef with firmware 32.14.
INPA show a steady 5000hpa (which is 72.5psi), see attached image, JB4 logging at idle shows 65. If I manually kick in my second pump, I see the JB4 log going straight to a stable 77psi (5900hpa=86psi) which is the maximum the lpfp sensor is reading. The fact that the pressure is getting maxed out point out a fuel pressure regulator that I will take care but the fact is that the value of 65 in the jb4 is a live value, just wrong. The HPFP value is right on though.

anybody else noticed the same behavior?
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2010 E90 335XI 6AT with XPH stage 3 | JB4 G5 W/Trebila Tune | RB Next Gen+ | RB hot side INLETs | VRSF high flow OUTLETS | custom Stage 3 LPFP | ETS FMIC | MODDED VRSF CP | TIAL Q | BMS METH KIT CM10+CM5 | MMP Port Injection Gen2 | AR DESIGN cer. downP | BMS/MITSH OCC's | RB external PCV w/plugged HEAD | Best 1/4: 11.47@123mph
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CristianL1 CristianL1 is offline
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Default 09-15-2019, 07:52 PM

I also switched ekpm3 already and with the exact zb number that came with my car. Here is my log everything looks good from what I can tell. My only concern is that the pressure on the app is false compared to what I get from the other app.
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File Type: csv 2019-09-02 00_17_25_Map-2.csv (25.6 KB, 13 views)

Last edited by CristianL1; 09-15-2019 at 07:59 PM.. Reason: Adding attachment
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Default 09-17-2019, 07:40 PM

Even with Bavarian Technic the lpfp value is right on.

I suspect that when some condition are not met, the jb4 does not display the correct value, like when in park, or below certain rpm...because I have seen values in the 72's in my logs.
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2010 E90 335XI 6AT with XPH stage 3 | JB4 G5 W/Trebila Tune | RB Next Gen+ | RB hot side INLETs | VRSF high flow OUTLETS | custom Stage 3 LPFP | ETS FMIC | MODDED VRSF CP | TIAL Q | BMS METH KIT CM10+CM5 | MMP Port Injection Gen2 | AR DESIGN cer. downP | BMS/MITSH OCC's | RB external PCV w/plugged HEAD | Best 1/4: 11.47@123mph
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Default 09-20-2019, 08:06 PM

bump for an update

have an inconsistent issue with lpfp pressure and need to know why I got an offset on the JB4 versus actual pressure to figure out the real pressure I have


2010 E90 335XI 6AT with XPH stage 3 | JB4 G5 W/Trebila Tune | RB Next Gen+ | RB hot side INLETs | VRSF high flow OUTLETS | custom Stage 3 LPFP | ETS FMIC | MODDED VRSF CP | TIAL Q | BMS METH KIT CM10+CM5 | MMP Port Injection Gen2 | AR DESIGN cer. downP | BMS/MITSH OCC's | RB external PCV w/plugged HEAD | Best 1/4: 11.47@123mph
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Default 09-23-2019, 06:08 AM

That’s odd- haven’t heard of this issue often with the app.

Let me get with terry / mobile



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Default 09-24-2019, 07:35 PM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
Thatís odd- havenít heard of this issue often with the app.

Let me get with terry / mobile
Any news on this?

Could it be related to a custom BEF (Trebila) reporting LPFP differently? I could try with the standard BMS BEF if it is worthed

In my case, I am using the JB4 interface with a windows laptop, not a phone with a JB4 app.


2010 E90 335XI 6AT with XPH stage 3 | JB4 G5 W/Trebila Tune | RB Next Gen+ | RB hot side INLETs | VRSF high flow OUTLETS | custom Stage 3 LPFP | ETS FMIC | MODDED VRSF CP | TIAL Q | BMS METH KIT CM10+CM5 | MMP Port Injection Gen2 | AR DESIGN cer. downP | BMS/MITSH OCC's | RB external PCV w/plugged HEAD | Best 1/4: 11.47@123mph
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Default 09-25-2019, 11:25 AM

Quote:
Originally Posted by Stephtech
Any news on this?

Could it be related to a custom BEF (Trebila) reporting LPFP differently? I could try with the standard BMS BEF if it is worthed

In my case, I am using the JB4 interface with a windows laptop, not a phone with a JB4 app.
Might be worth a switch to rule that out- didn't realize you weren't running one of our OTS maps



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Default 09-25-2019, 02:50 PM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
Might be worth a switch to rule that out- didn't realize you weren't running one of our OTS maps
ok will try with BMS bef


2010 E90 335XI 6AT with XPH stage 3 | JB4 G5 W/Trebila Tune | RB Next Gen+ | RB hot side INLETs | VRSF high flow OUTLETS | custom Stage 3 LPFP | ETS FMIC | MODDED VRSF CP | TIAL Q | BMS METH KIT CM10+CM5 | MMP Port Injection Gen2 | AR DESIGN cer. downP | BMS/MITSH OCC's | RB external PCV w/plugged HEAD | Best 1/4: 11.47@123mph
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Default 09-26-2019, 03:23 PM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
Might be worth a switch to rule that out- didn't realize you weren't running one of our OTS maps
Iím running a BMS BEF with jb4 app & itís giving me those false readings.
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Default 09-26-2019, 06:05 PM

Quote:
Originally Posted by CristianL1
Iím running a BMS BEF with jb4 app & itís giving me those false readings.
Have you verified?

What are you getting @ WOT?



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Default 09-26-2019, 08:18 PM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
Have you verified?

What are you getting @ WOT?
65 at idle and up to 74 at WOT according to jb4 log. You can see log on my earlier post. With pro tool & jb4 at map 0 I get 72 at idle & i seen around 76 accelerating. But I have not logged a WOT since i would need to buy the mhd log license.
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Default 09-26-2019, 09:20 PM

Quote:
Originally Posted by CristianL1
65 at idle and up to 74 at WOT according to jb4 log. You can see log on my earlier post. With pro tool & jb4 at map 0 I get 72 at idle & i seen around 76 accelerating. But I have not logged a WOT since i would need to buy the mhd log license.
Well, just the fact that at idle the pressure reported does not match what other software reports seems kinda strange.

I have noticed the following: I have the car already idling, I then start the jb4 interface software and connect to car. If watching closely at the lpfp value (in the bottom box), the value is displayed within maybe a second but it is enough time to see the value climbing. ex: 0, 16, 43, 65.

This behavior is strange as this value should be displayed unmanipulated from the DME, so that should be straight to 72 (65 in this case)


2010 E90 335XI 6AT with XPH stage 3 | JB4 G5 W/Trebila Tune | RB Next Gen+ | RB hot side INLETs | VRSF high flow OUTLETS | custom Stage 3 LPFP | ETS FMIC | MODDED VRSF CP | TIAL Q | BMS METH KIT CM10+CM5 | MMP Port Injection Gen2 | AR DESIGN cer. downP | BMS/MITSH OCC's | RB external PCV w/plugged HEAD | Best 1/4: 11.47@123mph
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Default 09-27-2019, 12:16 PM

Quote:
Originally Posted by Stephtech
Well, just the fact that at idle the pressure reported does not match what other software reports seems kinda strange.

I have noticed the following: I have the car already idling, I then start the jb4 interface software and connect to car. If watching closely at the lpfp value (in the bottom box), the value is displayed within maybe a second but it is enough time to see the value climbing. ex: 0, 16, 43, 65.

This behavior is strange as this value should be displayed unmanipulated from the DME, so that should be straight to 72 (65 in this case)
I do too stephtech when i start it up after having the car idle. I find it even more strange that we both get 65 psi.
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