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Default E85 BEF Big Stutter - 12-02-2019, 11:26 AM

Today when doing my first logs with the e85 BEF and map 2, I hit a major stutter. To me, it looks like the HPFP crashed, possibly due to slight overboosting. Do I need to revisit DB tuning, is the HPFP at its limit, or is there something else I can do to fix this?

Thanks!
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File Type: csv 191202_1208.csv (8.7 KB, 7 views)
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Default 12-02-2019, 01:14 PM

Fuel pressure is the weak link on these. Boost and tuning look OK.

What E85 mix?


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Default 12-02-2019, 01:23 PM

Here's the gas station:
Store Details - Kwik Trip | Kwik Star

They indicate 75% E E85 and 10% E 93. I did a mix of 7.5 gal E85 and 8.6 gal 93 = E40ish. Maybe it's time to start testing at the pump.


2013 E92 335i XDrive
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Default 12-02-2019, 01:34 PM

Try lowering the mix to see how low you need to go to get fuel pressure to maintain.


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Default 12-02-2019, 01:51 PM

Ok, I'll put a gallon of 93 in and see how it does. Thanks!


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Default 12-02-2019, 06:59 PM

Quote:
Originally Posted by andrews013
Ok, I'll put a gallon of 93 in and see how it does. Thanks!
Id add 2 gallons



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Default 12-02-2019, 08:06 PM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
Id add 2 gallons
Will do, thanks. Is this due to my stock lpfp, or is the hpfp already maxed out?


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Default 12-03-2019, 12:24 PM

I added two gallons of 93. The HPFP is still crashing at low RPM. I have attached one log where the hpfp barely holds on, and one where it completely crashes. What should FOL be set to when using a BEF?
Attached Files
File Type: csv 191203_1226.csv (6.0 KB, 6 views)
File Type: csv 191203_1223.csv (10.1 KB, 6 views)


2013 E92 335i XDrive
JB4, MHD E85 BEF, XHP, XDelete Sport, VRSF 7 HD IC, GFB DV+, VRSF CP, VRSF D/P, PE Mod, ST V1 Suspension.

Last edited by andrews013; 12-03-2019 at 01:55 PM..
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Default 12-03-2019, 02:40 PM

FOL has no effect on fuel pressure.

Fuel pressure is improved here. Could lower the mix a bit more or lean out the AFR to keep it up if it gets to the point that it's sputtering like this.
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Default 12-03-2019, 02:43 PM

Ok, I'll put in some more 93. It still sputters out if I start a pull below 3000 RPMs. Too bad it can't handle more e85... I was hoping to run more timing.


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Default 12-06-2019, 08:26 AM

Quote:
Originally Posted by Terry @ BMS
FOL has no effect on fuel pressure.

Fuel pressure is improved here. Could lower the mix a bit more or lean out the AFR to keep it up if it gets to the point that it's sputtering like this.
I added two more gallons of 93 (total of four additional) and I am still crashing the HPFP. I noticed slight overboosting in the logs... Would bumping down duty bias below 4000 RPM help? Or just more 93?
Attached Files
File Type: csv 191206_0817.csv (2.5 KB, 2 views)
File Type: csv 191206_0818.csv (3.2 KB, 2 views)


2013 E92 335i XDrive
JB4, MHD E85 BEF, XHP, XDelete Sport, VRSF 7 HD IC, GFB DV+, VRSF CP, VRSF D/P, PE Mod, ST V1 Suspension.
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Default 12-06-2019, 09:13 AM

Boost targeting is fine here.

On fuel pressure I can't tell why it's crashing as you should be able to hold on a mild E85 mix. Your options are to lower boost, check low fuel pressure by adding a sensor or gauge to confirm it's OK, or maybe swap out the high pressure pump.


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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 12-06-2019, 09:44 AM

Quote:
Originally Posted by Terry @ BMS
Boost targeting is fine here.

On fuel pressure I can't tell why it's crashing as you should be able to hold on a mild E85 mix. Your options are to lower boost, check low fuel pressure by adding a sensor or gauge to confirm it's OK, or maybe swap out the high pressure pump.
I just read about how the hpfp was changed for late E series cars and flows less... Could that be what I'm seeing?


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Default 12-06-2019, 03:38 PM

Another two gallons of 93, another log. No sputter, but rail pressure dips a lot.
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File Type: csv 191206_1422.csv (4.5 KB, 2 views)


2013 E92 335i XDrive
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Default 12-06-2019, 05:46 PM

And now timing is taking a hit. I suggest less boost until you can sort out why the pressure isn't holding as well as other cars.
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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 Today, 01:55 PM

I filled the rest of my tank with 93 and switched to the pump BEF. How does this log look, besides my turbo falling on its face?
Attached Files
File Type: csv 191212_1216.csv (10.1 KB, 0 views)


2013 E92 335i XDrive
JB4, MHD E85 BEF, XHP, XDelete Sport, VRSF 7 HD IC, GFB DV+, VRSF CP, VRSF D/P, PE Mod, ST V1 Suspension.
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