how to run e85

Brandon818 · 12-20-2016, 04:18 PM

what does it take to run e85 besides the jb4? would mixing 85 with 91 (having a jb4) blow my fuel pump? if its do able, would you recommenced upgrading the fuel pump?

Blaster400 · 12-20-2016, 04:29 PM

Start by adding 30% E85. Switch JB4 to map 5. Done.

For higher mixtures of E85 you'll need to upgrade your LPFP and add a back-end flash.

ferocity02 · 12-20-2016, 04:49 PM

The stock pump starts to crap out around 40% ethanol (E40). I'd start with 30% ethanol (not 30% E85 as mentioned above) and do a log and see how the LPFP pressures look.

My pump was right on the edge with E40 so I upgraded to the Fuel-It Stage 2 pump just to be safe.

mike@x-ph.com · 12-20-2016, 11:32 PM

I would start with 20% E85 not 30% ... We need to know how healthy your fuel pumps are before putting more pressure on them

titium · 12-21-2016, 12:17 AM

i wouldn't rely on the jb4 by itself to run e85. ideally you'll want a backend flash or mhd flash.

LQQKOUT · 12-21-2016, 06:13 AM

Quote:

Originally Posted by Brandon818

what does it take to run e85 besides the jb4? would mixing 85 with 91 (having a jb4) blow my fuel pump? if its do able, would you recommenced upgrading the fuel pump?

E85 will not blow your fuel pump. The stock pump just can't keep up with the higher fuel demand required when running a mix. I have run E30 on the stock fuel pump and all the way to E65 with a stage 1 pump.

12-20-2016, 04:18 PM	#1
Brandon818 Second Lieutenant 57 Rep 234 Posts Drives: 2012 335is, 2018 M5, 2003 M3, Join Date: Oct 2016 Location: In the Hills iTrader: (4) Garage List 2022 Mexico Blau M ... [0.00] 2003 Bmw M3 [0.00] 2018 Bmw M5 [0.00] 2012 BMW 335is [0.00]	how to run e85 what does it take to run e85 besides the jb4? would mixing 85 with 91 (having a jb4) blow my fuel pump? if its do able, would you recommenced upgrading the fuel pump?
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12-20-2016, 04:29 PM	#2
Blaster400 Captain 127 Rep 865 Posts Drives: BMW X3 35i, Porsche Macan S Join Date: Jul 2012 Location: Scottsdale AZ iTrader: (3) Garage List 2018 Porsche Macan S [0.00] 2012 BMW X3 35i [0.00]	Start by adding 30% E85. Switch JB4 to map 5. Done. For higher mixtures of E85 you'll need to upgrade your LPFP and add a back-end flash. __________________ MOTIV 750 ST \| MOTIV PI \| 100% E85 \| Fuel-it Stage 4 LPFP \| MOTIV Boost Box + MHD Protune \| Quaife \| Öhlins \| Brembo \| Akrapovic
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12-20-2016, 04:49 PM	#3
ferocity02 Colonel 530 Rep 2,083 Posts Drives: 2013 135is Join Date: May 2014 Location: USA iTrader: (8)	The stock pump starts to crap out around 40% ethanol (E40). I'd start with 30% ethanol (not 30% E85 as mentioned above) and do a log and see how the LPFP pressures look. My pump was right on the edge with E40 so I upgraded to the Fuel-It Stage 2 pump just to be safe. __________________ 2013 135is DCT Carbon Black Metallic
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12-20-2016, 11:32 PM	#4
mike@x-ph.com BimmerPost Supporting Vendor 24199 Rep 190,807 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	I would start with 20% E85 not 30% ... We need to know how healthy your fuel pumps are before putting more pressure on them __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
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12-21-2016, 12:17 AM	#5
titium Major 327 Rep 960 Posts Drives: 2009 BMW 135i Join Date: Jun 2015 Location: Sydney iTrader: (0)	i wouldn't rely on the jb4 by itself to run e85. ideally you'll want a backend flash or mhd flash.
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