Anyone running FBO + tune on e85 in N/A form???

[FogCityM3]

Agree with RG's post above. I have logged two tunes, one obviously does exactly what he describes (where the TQ tables are inputted into Min TQ) the other one doesn't. Different tuning approaches by different companies and its easily detectable if you log the right parameters. If using the BT tool to log parameters and impact of gas on bhp, probably best to keep it stock as he mentioned.

[///Mvy]

I like the idea of adding a little E85 for a safety net and to reach all the timing targets on track days. Any downsides to running 2-4 E85 gallons in a full tank on a stock motor?

[M.Hagen]

Originally Posted by ///Mvy

I like the idea of adding a little E85 for a safety net and to reach all the timing targets on track days. Any downsides to running 2-4 E85 gallons in a full tank on a stock motor?

If you run 4 gallons, and you have a high ethanol (summer) blend, you may reach the trim limit for the DME and an error code will be thrown. This is due to the higher volume demand required for ethanol to reach the proper lambda value. There have been a couple instances of this happening on the forums. I think that limit is somewhere around 4-5gal.

If that happens, the fix is to add more pump gas.

[MFL]

Yeah, worst case scenario, you'll go into limp mode as a precaution. Just drive with civility and throw a gallon or two of pump fuel at the problem.

With the winter mix, I'm throwing 6 gallons of e85 in my tank and filling the rest up with 92.

[Hujan]

Have we determined whether running E85 is safe for the longevity of the fuel system (e.g., seals and whatnot)?

[///Mvy]

Originally Posted by M.Hagen

If you run 4 gallons, and you have a high ethanol (summer) blend, you may reach the trim limit for the DME and an error code will be thrown. This is due to the higher volume demand required for ethanol to reach the proper lambda value. There have been a couple instances of this happening on the forums. I think that limit is somewhere around 4-5gal.

If that happens, the fix is to add more pump gas.

I'm gonna add 2-3 gallons this weekend for my driving event on Sunday. I'll let you guys know how it goes.

[///Mvy]

http://www.m3post.com/forums/showthread.php?t=762930

After reading this thread, I've decided against the E85 mix. There's some good info in there for people on the fence.

[MFL]

Brazil.

Brazil has 25% Ethanol content in all of their fuel as they are one of the leading exporters of ethanol fuel.

there is no difference between the fuel system of my car in Seattle and an identical M3 in Rio. The fuel system handles it just fine.

However, do whatever you want. It's not a substantial amount of HP to gain if you lose peace of mind. It just means more Ethanol for me

[///Mvy]

Originally Posted by MFL

Brazil.

Brazil has 25% Ethanol content in all of their fuel as they are one of the leading exporters of ethanol fuel.

there is no difference between the fuel system of my car in Seattle and an identical M3 in Rio. The fuel system handles it just fine.

However, do whatever you want. It's not a substantial amount of HP to gain if you lose peace of mind. It just means more Ethanol for me

After reading two other full threads. It looks like 95% of the people don't have issues running up to 4gal of E-85. Of course the first thread that I read and linked to was the guy that ran into problems. I will be trying it out

[sebaflex]

so I heard a certain tuner has released E85 support for e46 m3 and will soon be available for e9x m3's. hopefully he makes the announcement soon!

[M.Hagen]

All modern fuel hardware is compatible with ethanol blended fuels.

Natural rubber has been absent from OE fuel systems for over 2 decades.

Because ethanol burns so clean, if you have a dirty fuel system from running regular pump gas for a long time (100k+ miles), the ethanol blends will actually clean the system causing gunk to possibly get stuck in your fuel injectors. This has been reported on some forums for high mileage cars making the switch. However, this problem is because regular pump gas is dirty, not because ethanol blends are dirty or degrade the fuel hardware.

[whats77inaname]

Originally Posted by MikeeM3

Me and my buddy were talking about this all weekend and he asked me to inquire to see if theres some people on this forum that are tuned with e85 on their all-motor full bolt on set-up???

Thanks

Yes.

Originally Posted by sebaflex

so I heard a certain tuner has released E85 support for e46 m3 and will soon be available for e9x m3's. hopefully he makes the announcement soon!

Gintani released a tune for running 100% E85 for the S65 a long time ago.

http://www.m3post.com/forums/showthread.php?t=871996

Unfortunately, no hard information (injector duty cycle, etc) was ever introduced into the thread, outside of the OP advising us on how the car felt.

[///Mvy]

I'm currently running 3gal of e85 in a full tank. Feels great! I'll be using this setup for driving events in the future.

[Longboarder]

Originally Posted by MFL

Brazil.

Brazil has 25% Ethanol content in all of their fuel as they are one of the leading exporters of ethanol fuel.

there is no difference between the fuel system of my car in Seattle and an identical M3 in Rio. The fuel system handles it just fine.

However, do whatever you want. It's not a substantial amount of HP to gain if you lose peace of mind. It just means more Ethanol for me

^ ^ this exactly. The ultimate concentration depends on how much ethanol is in your pump gas already. Our Cali 91 octane is E10 and I shoot for an E20-E25 blend which requires between 2-2.5 gal of e85 for every tank.

[8k3]

Originally Posted by Longboarder

^ ^ this exactly. The ultimate concentration depends on how much ethanol is in your pump gas already. Our Cali 91 octane is E10 and I shoot for an E20-E25 blend which requires between 2-2.5 gal of e85 for every tank.

Is that your current solution for running the 650? $25 can of Torco each tank would put me in the poor house now that I'm DDing the car again.

[Longboarder]

Originally Posted by 8k3

Is that your current solution for running the 650? $25 can of Torco each tank would put me in the poor house now that I'm DDing the car again.

Torco fouled my plugs so I don't run it anymore. I was using a race gas blend + 91 pump and that got pretty expensive until I found the e25 solution. I don't get on the car hard for daily driving and if I do a WOT pull it isn't sustained for very long...so in these circumstances it works. If I was going to the track or do really hard driving it would get a blend of pump and race gas.

[8k3]

Originally Posted by Longboarder

Torco fouled my plugs so I don't run it anymore. I was using a race gas blend + 91 pump and that got pretty expensive until I found the e25 solution. I don't get on the car hard for daily driving and if I do a WOT pull it isn't sustained for very long...so in these circumstances it works. If I was going to the track or do really hard driving it would get a blend of pump and race gas.

Cool, that's what I'll do. I like torco, but the cost and orange residue is concerning. I have ethanol free gas in my area so I'll do that with E85 to get the blend right. I don't go over 5k rpm, if I do it's with race gas as you do. Thanks for the heads up man

[Bmw doubles]

I know this is an older post, but you can put 3-4 gallons of e85 in your NA motor and members here have had no problems? And have felt butt-dyno results?

I ask because my next car is going to be an S65 and I'm trying to see what's possible with these cars.

[8500RPM]

Originally Posted by Bmw doubles

I know this is an older post, but you can put 3-4 gallons of e85 in your NA motor and members here have had no problems? And have felt butt-dyno results?

I ask because my next car is going to be an S65 and I'm trying to see what's possible with these cars.

I tried it for a month with my 91 tuned car running E25 which came out to 95 octane. According to my butt dyno the car became a little sluggish. Ran perfect just felt a little less angry than before. I don't have before numbers but I dyno'ed the car with the E25 and made 375hp/275tq on a dynojet @ sealevel 75*F

Mods:
Test Pipes
OEM Exhaust Mod
Intake
Turner Motorsports tune
E25

I run the car now on just straight 93 and it runs a little better. Might have been too much octane for my 91 tune. Might go E85 tune in the near future