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ross22 ross22 is offline
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Default 29DC Error on Full E85, LPFP not enough? - 10-08-2016, 04:44 PM

During two logging passes yesterday, 29DC popped up. I recently ramped up to full E85 because at the top of the 1/4 mile, I would occasionally pop the same code, on an E60 mix my last time out at the track. Since then, I also stepped up to a 7inch FMIC.

From the logs I can see that LPFP goes into the 40s on the runs that generated the code. Does this mean I am maxing the Fuel-It Stage 2 pump at 23 lbs of boost?

Any suggestions other than going to Stage 3?

Mods:
FBO (+Inlets)
Fuel-It Stage 2
Fuel-It TBI
RB Turbos
E85 BEF/JB4 Map 3
Attached Files
File Type: csv 29DC_Error_2016-10-07 14_51_15.csv (18.8 KB, 32 views)
File Type: csv 29DC_Error_2016-10-07 17_17_17.csv (20.2 KB, 22 views)
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duracell8 duracell8 is offline
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Default 10-08-2016, 05:06 PM

Per the sticky at the top of the forum.

http://www.n54tech.com/forums/showthread.php?t=21269

FP L: Fuel pressure, low system. Pressure is read on the left hand scale X 10. Otherwise known as the in tank low pressure fuel pump. This value typically ranges from 55-70psi. If dropping below 50psi it indicates a problem with your low fuel pressure pump. Most often that problem is it needs to be augmented with an inline pump to keep up with the higher fuel demands



2008 535i RB Turbos, ER Charge pipe, Tial BOV, 2.3 gal BMS Meth 75/25, Dual nozzle CM10 and CM7, BMS Race Flash, 3" Down Pipe, JB4 ISO G5, N20 Map Sensor, BMS OCC, BMS PCV Valve, JB4 Mobile App, 12.3 @ 116 mph
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ross22 ross22 is offline
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Default 10-08-2016, 09:22 PM

Quote:
Originally Posted by duracell8
Per the sticky at the top of the forum.

http://www.n54tech.com/forums/showthread.php?t=21269

FP L: Fuel pressure, low system. Pressure is read on the left hand scale X 10. Otherwise known as the in tank low pressure fuel pump. This value typically ranges from 55-70psi. If dropping below 50psi it indicates a problem with your low fuel pressure pump. Most often that problem is it needs to be augmented with an inline pump to keep up with the higher fuel demands
Yep, I'm familiar with the sticky, read it many, many times. Per Fuel-It you can't augment a Stage 2 kit with an inline pump. So, if the inline pump supplies 50% more than a stock LPFP. I'm already running the Stage 2 Fuel-It pump, which runs 100% more than a stock LPFP. If I'm out of fuel with this setup, then I'm guessing I'll need the Stage 3? 300% more than stock? Or could it be as simple as a failing pressure sensor?
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duracell8 duracell8 is offline
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Default 10-08-2016, 09:30 PM

How will a failing lpfp sensor, that u assume is causing ur low hp, prevent the low pressure fuel pump from providing adequate flow to the hpfp? If the sensor is biased and reading the low then shouldn't the dme increase the pwm to provide additional fuel? Just trying to think it out loud.



2008 535i RB Turbos, ER Charge pipe, Tial BOV, 2.3 gal BMS Meth 75/25, Dual nozzle CM10 and CM7, BMS Race Flash, 3" Down Pipe, JB4 ISO G5, N20 Map Sensor, BMS OCC, BMS PCV Valve, JB4 Mobile App, 12.3 @ 116 mph
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ross22 ross22 is offline
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Default 10-08-2016, 09:43 PM

I'm don't know for sure the DME would try to add more fuel via PWM or other methods, it feels like it reads low pressure then generates the code which triggers limp mode until the code is cleared. I'm not really sure either way, I'm hoping Terry or Steve can shed some light on if the Stage 2 could actually be out of capacity.
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Steve @ BMS/Fuel-It!'s Avatar
Steve @ BMS/Fuel-It! Steve @ BMS/Fuel-It! is offline
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Default 10-09-2016, 11:02 PM

At those power levels, you are maxing out your fueling. Stage 3 will hold higher LPFP pressures but you'll still be maxing out the HPFP and TBI, especially on 100% E85.



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ross22 ross22 is offline
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Default 10-10-2016, 05:01 AM

Quote:
Originally Posted by Steve @ BMS/Fuel-It!
At those power levels, you are maxing out your fueling. Stage 3 will hold higher LPFP pressures but you'll still be maxing out the HPFP and TBI, especially on 100% E85.
Thank you Steve. I was afraid you'd say that.

I'll tone down the boost a bit, and scale back on the E85. Guess that's it for project sleeper. Not bad for a daily driver.
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