Whats all required to run a mix of E85 35%+?

mightbaal · 05-30-2015, 03:49 AM

I was just wondering what is all required to run a 35-40% mix of E85? I am 100% stock with just a JB4. I just got the car like a week ago so I am new. I ran a 30% mix already and ran Map 5 let it tune a bit and it pushes 15-16 psi max n pulls like a sob lol. Early in the map I might have pushed it to hard I got a half engine symbol in the cluster but no check engine light. The turbos shut down 100% I restarted the car and have since put 70+ miles no problems. My DCI will be here Monday. I hear stuff about like some back end flash but I have no clue what that is. All my air fuel ratios and timing looked good too when I ran this. 2008 335XI 55k. I should say 1 time the car went into map 4 (safety map) when I was spinning alot in 2nd (it was raining)

MachWon · 05-30-2015, 08:48 AM

http://www.n54tech.com/forums/showthread.php?t=16643

Side note: get a set of downpipes.

csu87 · 05-30-2015, 11:17 AM

You need to do some reading before you do something stupid.

Some people have been able to get away with 40% e85 on a stock fuel system and some haven't. Test and log and tune and test and log until your trims and pressures are at a safe level.

mightbaal · 05-30-2015, 11:31 AM

Quote:

Originally Posted by csu87

You need to do some reading before you do something stupid.

Some people have been able to get away with 40% e85 on a stock fuel system and some haven't. Test and log and tune and test and log until your trims and pressures are at a safe level.

I did do some reading and seen people were running up to 40+% e85 on a stock car with map 5 so I started at 30%... It was probably even maybe slightly lower.

Fundguy1 · 05-30-2015, 11:38 AM

Ptf said that they go up to 50% on stock setup. That said just get the right Fuel-it pump and go 100% less than a grand and 1-2 hour DIY install. Why not?

musc · 05-30-2015, 11:45 AM

Key is logging and watching your high and low pressures, trims, AFRs. Every car is a little different. You will usually need some sort of fuel scalar adjustment via flash around E35 or so. The LPFP starts to give out around E45-50. These are estimates but will vary slightly car to car.

csu87 · 05-30-2015, 12:11 PM

You can also go the route of procede with flex fuel sensor. Those guys were running 100% e85 on stock fuel systems

05-30-2015, 03:49 AM	#1
mightbaal g35x 105 Rep 630 Posts Drives: 2008 BMW 335XI Join Date: May 2015 Location: wisconsin iTrader: (0)	Whats all required to run a mix of E85 35%+? I was just wondering what is all required to run a 35-40% mix of E85? I am 100% stock with just a JB4. I just got the car like a week ago so I am new. I ran a 30% mix already and ran Map 5 let it tune a bit and it pushes 15-16 psi max n pulls like a sob lol. Early in the map I might have pushed it to hard I got a half engine symbol in the cluster but no check engine light. The turbos shut down 100% I restarted the car and have since put 70+ miles no problems. My DCI will be here Monday. I hear stuff about like some back end flash but I have no clue what that is. All my air fuel ratios and timing looked good too when I ran this. 2008 335XI 55k. I should say 1 time the car went into map 4 (safety map) when I was spinning alot in 2nd (it was raining)
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05-30-2015, 08:48 AM	#2
MachWon Private First Class 25 Rep 197 Posts Drives: 2007 335i 6mt. JB4 + CDP's. Join Date: Mar 2015 Location: . iTrader: (0)	http://www.n54tech.com/forums/showthread.php?t=16643 Side note: get a set of downpipes.
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05-30-2015, 11:17 AM	#3
csu87 Banned 2134 Rep 3,554 Posts Drives: 09 335xi Join Date: Nov 2013 Location: Northern Colorado iTrader: (0)	You need to do some reading before you do something stupid. Some people have been able to get away with 40% e85 on a stock fuel system and some haven't. Test and log and tune and test and log until your trims and pressures are at a safe level.
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05-30-2015, 11:38 AM	#5
Fundguy1 Major General 2032 Rep 8,339 Posts Drives: 335 e93 Join Date: Aug 2014 Location: Orlando, fl iTrader: (0)	Ptf said that they go up to 50% on stock setup. That said just get the right Fuel-it pump and go 100% less than a grand and 1-2 hour DIY install. Why not?
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05-30-2015, 11:45 AM	#6
musc ****** 184 Rep 1,702 Posts Drives: Audi TTRS, 335is Join Date: Dec 2006 Location: SC iTrader: (9) Garage List 2011 BMW 335is [10.00]	Key is logging and watching your high and low pressures, trims, AFRs. Every car is a little different. You will usually need some sort of fuel scalar adjustment via flash around E35 or so. The LPFP starts to give out around E45-50. These are estimates but will vary slightly car to car.
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05-30-2015, 12:11 PM	#7
csu87 Banned 2134 Rep 3,554 Posts Drives: 09 335xi Join Date: Nov 2013 Location: Northern Colorado iTrader: (0)	You can also go the route of procede with flex fuel sensor. Those guys were running 100% e85 on stock fuel systems
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