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      10-22-2011, 06:17 PM   #1
alpinewhite3series
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Who has tried this???

So i had a conversation with Terry from BMS, over email in regards to see if we can have a map made for runnning E85 gas. So he told me that it be ok to run it on Stage 2 map 2 in a mixture of 93 octane, and E85 octane. Now it be 4 gallons of E85 and the rest of 93, he also replied that their would be a increase in power as well as boost. Now i asked if it be safe for the injectors, manifold, as well as fuel lines, he told me yes we should be ok. Now before i try this i like to know has anyone attempted this and what were the results, and if they were any consequences?
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      10-22-2011, 06:20 PM   #2
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I am definitely interested in trying this out. Would also like to know other's experience.
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      10-22-2011, 06:27 PM   #3
alpinewhite3series
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I think i would do it but not consistently to damage the motor
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      10-22-2011, 08:04 PM   #4
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E85 isn't going to hurt the engine. The biggest worry is rubber o-rings in the fuel system, ethanol dries up rubber. Yes, people have tried this. There are a few people on e90post running this with success
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      10-22-2011, 10:55 PM   #5
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I used it throughout the summer with a 3 gallon E85 and the rest 93Oct. I was running a procede at the time and the logs looked good. Unfortunatly I dont have any saved. I also threw in some Marvel Mystery oil to help with lubrication, I'm not sure if it did anything but the car ran fine with it. Autotune had it hold strong at 14-15 psi tapering down towards redline, with 80-90 degree ambient IAT's. I have a FMIC, intake, and catback.

Edit: Results may vary, try this at your own risk!!!
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      10-22-2011, 11:00 PM   #6
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Subscribing. Very interested as well.
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      10-22-2011, 11:22 PM   #7
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I've ran almost a 50% e85/e10 mix in my srt-4, but I didn't make any fueling changes, so I drove it very gingerly. I was mainly doing it as an experiment to clean the injectors.

What I'm interested in, is the lambda value for ethanol is different than gasoline. As I understand it, the n54 runs a wideband o2 sensor stock, so because of that, you are supposed to be able to command exact lambda values at WOT (Instead of guessing like most systems do, including my srt-4). I don't know what lamda value any of the maps shoot for, but I would think that they would not be "rich" enough for a notably higher concentration (~28% by volume) of ethanol.
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      10-22-2011, 11:59 PM   #8
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I've been running 50/50 blends of pump 93 and E85 on my car for the past 2 months or so straight, and I run map 7 on my jb4 which is the lightweight race map at 16.5 psi without any issues. I can't go back to straight pump 93 and map 2 any longer, but I just may right now with this cold weather lurking. Traction is nonexistent in 2nd gear with stock brand new RFT's...
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      10-23-2011, 12:06 AM   #9
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Isn't there ethanol in our unleaded gasoline already? avg around 5% for all states but Gov't has approved 10% for the future ????
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      10-23-2011, 12:17 AM   #10
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I'm interested to know about more this but I will be staying away from E85 personally.
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      10-23-2011, 01:52 AM   #11
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I'm interested to know about more this but I will be staying away from E85 personally.
Do we have E85 here?
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      10-23-2011, 02:17 AM   #12
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Quote:
Originally Posted by RnmEvo9 View Post
I've been running 50/50 blends of pump 93 and E85 on my car for the past 2 months or so straight, and I run map 7 on my jb4 which is the lightweight race map at 16.5 psi without any issues. I can't go back to straight pump 93 and map 2 any longer, but I just may right now with this cold weather lurking. Traction is nonexistent in 2nd gear with stock brand new RFT's...
The only thing run flats are good for is just that >>, a flat... Non run flats are lighter by 2-5 lbs a tire, will last 20% longer, and provide MUCH better grip for acceleration, cornering and braking... For the life of me I don't know why sooo many people don't understand this about about these tires... If your going to add power, anything more than 25hp, dump the RFT's and go non RFT's, you'll save $$ too...
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      10-23-2011, 06:20 AM   #13
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Quote:
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Do we have E85 here?
Sure do!

Only concerns with E85 are that BMW state that E10 is the maximum ethanol you should run. Given the fragile nature of the HPFP, I'm not so sure it is a good idea to aggravate it with 85% ethanol given the corrosive nature of the stuff (however a very reliable source tells me that any car that is engineered to run E10 will also be fine running E85 - from a fuel corrosion point of view).

The second thing to consider is that E85 requires a significantly richer mixture to achieve stoichiometric, so at elevated boost levels you may run out of injector capacity (to inject enough of the stuff to achieve the mixture you are after).

I think I'll wait and watch to see how others get on with E85 and the HPFP.
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      10-23-2011, 09:53 AM   #14
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Quote:
Originally Posted by BimmerEngineer View Post
The only thing run flats are good for is just that >>, a flat... Non run flats are lighter by 2-5 lbs a tire, will last 20% longer, and provide MUCH better grip for acceleration, cornering and braking... For the life of me I don't know why sooo many people don't understand this about about these tires... If your going to add power, anything more than 25hp, dump the RFT's and go non RFT's, you'll save $$ too...
I already know this, however, can't really complain about them too much since they were free...
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      10-23-2011, 07:49 PM   #15
alpinewhite3series
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So the ppl who havent tried this should WE DO IT?????????
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      10-23-2011, 09:21 PM   #16
RnmEvo9
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Its all up to you. I've been prepared to buy a HPFP under my own dime if it ever took a shit. To me, the power difference between map 2 and 7 is rather significant, but now its probably slower because traction is nonexistent lol. Oh, and be prepared for your mpg to take a hit, but you should already know this as E85 has lower energy content than gasoline. I would never recommend running straight E85 on these motors, however, I've been very content with 50/50 blends. Cheap race fuel FTW!
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      10-23-2011, 09:40 PM   #17
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Oh and the only reason why I even attempted to do this is because of the power that I had in my E85 powered Evo 9. It was really hard going from a 400+whp Evo to a stock 135i lol. In case if anybody wants to read some valuable information regarding the N54 and E85 (not sure about N55), take a look here: http://www.e90post.com/forums/showthread.php?t=227652
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      10-24-2011, 03:50 PM   #18
alpinewhite3series
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I really dont see the difference in motor in the n55 n the n54 just ones twin n ones single?
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      10-25-2011, 07:58 AM   #19
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Originally Posted by alpinewhite3series View Post
I really dont see the difference in motor in the n55 n the n54 just ones twin n ones single?
Time to bone up on that one then!
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      10-25-2011, 11:46 AM   #20
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Quote:
Originally Posted by RnmEvo9 View Post
Oh and the only reason why I even attempted to do this is because of the power that I had in my E85 powered Evo 9. It was really hard going from a 400+whp Evo to a stock 135i lol. In case if anybody wants to read some valuable information regarding the N54 and E85 (not sure about N55), take a look here: http://www.e90post.com/forums/showthread.php?t=227652
Thanks, helpful information.
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      10-25-2011, 09:33 PM   #21
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It looks like a few N54 guys run on E85 and gasoline combination, however, I have yet to see any dyno results. I couldn't find any...

I want to try this combination, but would like to see some dyno charts.
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      10-25-2011, 09:45 PM   #22
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Originally Posted by 135i_vs_ View Post
It looks like a few N54 guys run on E85 and gasoline combination, however, I have yet to see any dyno results. I couldn't find any...

I want to try this combination, but would like to see some dyno charts.
A dyno will be as much influenced by the tunes ability to utilize the octane than by just the octane itself. E85 is ~105oct and some simple ratio math if mixed with 91 or 93 can give you the mixed octane. Plenty of folks on the E90 side have proven that the octane of E85 is beneficial, the question yet to be fully answered is how harmful will use an E85 mix be on the fuel system.

I can't say if an E85 mix is or is not corosive to the N54's fuel system, but clearly the fuel system had to be designed to survice some ethenol content given that many US stations have 10% mixed in.
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