[ticaohaha]

Hi all
Im new to m235 and have some super noob question. My M235 build 08/2014 ( i think it come with Electronic Waste gate) , and i just put JB4 stage 2 on.
My question is : can i use E85 with JB4 as only mod ? for M235 as i remember the fuel tank hold 13.5 gallons. If i mix it, can i do 10 gal 93oct and 3.5 gal E85 ?

[Mike_L]

Gonna have to try it. EWG cars normally don't like E85. E30 seems to be about the highest you can go. Put it in and see what happens (of course, log it).

[sonystyle02]

I'd suggest reading up on the N55/JB4/E85 discussions on N54tech.com. According to Terry, you shouldn't use more than 30% E85 on EWG N55 cars and map 2. Keep in mind that a downpipe is suggested for map 2.

Make sure you have the EWG and flex fuel wires too.

[ticaohaha]

Thanks for the input guys. But one more thing if you dont mind, where can i order flex fuel wires ?

[Mike_L]

Burgers site, under Upgrades/N55 JB4 Upgrades.

[RoundelM3]

Just keep in mind that BMW specifically says not to use E85 - it is corrosive to some of the seals in the system and is hygroscopic, meaning it absorbs moisture/condensation and can introduce water into the injectors. If you're looking for increased octane, there are several good off-the-shelf octane boosters that won't harm your fuel system with prolonged use.

Also - depending on where you live, even your 93 octane gas can have up to 10% ethanol right at the pump. And, since ethanol has 30% less thermal efficiency than gasoline, your fuel mileage will be reduced to some extent.

[mike@x-ph.com]

Originally Posted by roundel335

Just keep in mind that BMW specifically says not to use E85 - it is corrosive to some of the seals in the system and is hygroscopic, meaning it absorbs moisture/condensation and can introduce water into the injectors. If you're looking for increased octane, there are several good off-the-shelf octane boosters that won't harm your fuel system with prolonged use.

Also - depending on where you live, even your 93 octane gas can have up to 10% ethanol right at the pump. And, since ethanol has 30% less thermal efficiency than gasoline, your fuel mileage will be reduced to some extent.

Technically you are correct, but the N54 guys have been using E85 for almost 9 years with no problem.
I run E70 on my car, never had any problems with corrosion

[FC4]

Originally Posted by roundel335

Just keep in mind that BMW specifically says not to use E85 - it is corrosive to some of the seals in the system and is hygroscopic, meaning it absorbs moisture/condensation and can introduce water into the injectors. If you're looking for increased octane, there are several good off-the-shelf octane boosters that won't harm your fuel system with prolonged use.

Also - depending on where you live, even your 93 octane gas can have up to 10% ethanol right at the pump. And, since ethanol has 30% less thermal efficiency than gasoline, your fuel mileage will be reduced to some extent.

Of course they say do not use E85, as does every manufacturer for a non Flex-fuel car. No one will recommend running 100% E85 unless you modify the fuel system accordingly. However, used appropriately, E85 will make more power and is just as safe as 100-octane unleaded on nearly any application.

There is not a single "good off-the-shelf octane booster that won't harm your fuel system with prolonged use." The only ones which do anything are the ones with MMT, and even then the effect is not significant. Have a look at what MMT does to your fuel system with prolonged use. The ones without MMT are just means of additional revenue from 16 year-olds who think a can of octane booster will make mom's Camry faster.

[Mike_L]

Originally Posted by FC4

There is not a single "good off-the-shelf octane booster that won't harm your fuel system with prolonged use." The only ones which do anything are the ones with MMT, and even then the effect is not significant. Have a look at what MMT does to your fuel system with prolonged use. The ones without MMT are just means of additional revenue from 16 year-olds who think a can of octane booster will make mom's Camry faster.

NOS Race Formula is really good. I've done extensive testing with it with multiple cars and it will reduce knock retard about 90% of the time. I have no idea whats in it, but it does work.

EDIT: Never mind. Its got MMT in it. And NitroMethane. Still works, but not something for every tankful.

[ticaohaha]

Thanks a lot for the info guys. I will need to order FF wires and EWG hardness to use E85 . According to Terry from N54 tech, it will worth it

[RoundelM3]

Originally Posted by mike@x-ph.com

Technically you are correct, but the N54 guys have been using E85 for almost 9 years with no problem.
I run E70 on my car, never had any problems with corrosion

So I guess if all the other kids jump off a bridge, there should be no hesitation in doing that too? I've been driving for over 50 years now, and have learned my lesson the hard way about ignoring manufacturer's recommendations. There are no significant power gains to be had from adding ethanol to your fuel unless you are raising boost way beyond the safe limit where additional octane is required to lower the intake air temps and keep detonation from occurring. The "N54 boys", of which I was one, also use methanol injection to allow higher boost levels without cratering their pistons, but that has its downside as well, not the least of which is an extreme fire/explosion hazard if the tank or delivery lines sprout a leak in the engine compartment. And then there's NOS, which is fine for big-block crate motors, but probably not recommended for an N55.

Hey, it's your $50K+ car - feel free to do whatever you feel will get you that extra 1/10th of a second at the drag strip.

[mike@x-ph.com]

Originally Posted by roundel335

So I guess if all the other kids jump off a bridge, there should be no hesitation in doing that too? I've been driving for over 50 years now, and have learned my lesson the hard way about ignoring manufacturer's recommendations. There are no significant power gains to be had from adding ethanol to your fuel unless you are raising boost way beyond the safe limit where additional octane is required to lower the intake air temps and keep detonation from occurring. The "N54 boys", of which I was one, also use methanol injection to allow higher boost levels without cratering their pistons, but that has its downside as well, not the least of which is an extreme fire/explosion hazard if the tank or delivery lines sprout a leak in the engine compartment. And then there's NOS, which is fine for big-block crate motors, but probably not recommended for an N55.

Hey, it's your $50K+ car - feel free to do whatever you feel will get you that extra 1/10th of a second at the drag strip.

I've been driving for over 50 years now, and have learned my lesson the hard way about ignoring manufacturer's recommendations.

Same can be said about tuning the car but i am assuming you do that too.
BMW does not recommend adding boost over stock targets

There are no significant power gains to be had from adding ethanol to your fuel unless you are raising boost way beyond the safe limit where additional octane is required to lower the intake air temps and keep detonation from occurring

I wonder how you know what is the safe limitsfor boost ? since datalogs show that the car handles the extra boost with no problem.


Oh and by the way, E85 at least for the N54 adds around 40whp to the car.

[ShlemonboostedM]

^^ +1 and e85 is magic and theirs no downside unless you use more then Suggested.. Like Mike said N54 being running it forever with no problems .. You being driving for 50 years dosent mean squat.. Theirs prove that e85 isn't harmful if used smart ... Unless afcorse you plan to drive your car for 50 years then Yea their might be a problem .. Lol.. not want to be rude just don't like when people throwing Infos that they not sure about ..

[FC4]

Originally Posted by roundel335

So I guess if all the other kids jump off a bridge, there should be no hesitation in doing that too? I've been driving for over 50 years now, and have learned my lesson the hard way about ignoring manufacturer's recommendations. There are no significant power gains to be had from adding ethanol to your fuel unless you are raising boost way beyond the safe limit where additional octane is required to lower the intake air temps and keep detonation from occurring. The "N54 boys", of which I was one, also use methanol injection to allow higher boost levels without cratering their pistons, but that has its downside as well, not the least of which is an extreme fire/explosion hazard if the tank or delivery lines sprout a leak in the engine compartment. And then there's NOS, which is fine for big-block crate motors, but probably not recommended for an N55.

Hey, it's your $50K+ car - feel free to do whatever you feel will get you that extra 1/10th of a second at the drag strip.

Sure.

It's obvious you're a bit out-of-place in this sort of conversation, so I recommend you sit this one out.

[Dosturbos]

Only thing I miss about my N54 335i is switching to the E85 map on my Cobb AP.
You can easily make another 40-50 WHP with E85/93Oct mix. Which on a drag strip can get you another .4-.5sec faster in the quarter mile.

N54 can take all it's fueling problems and suck it though.
I'd never go back to an N54, that vehicle was the definition of wallet rape.

[Redline8725]

Hello can anyone help me with this question? I have a 2014 m235i with downpipe, armytrix exhaust, afe intake, and a rev 9 intercooler +stage 2 jb4 and i was wondering what else do i need to be able to run 30% e85 and the rest on 91

[ronanz]

Originally Posted by Redline8725

Hello can anyone help me with this question? I have a 2014 m235i with downpipe, armytrix exhaust, afe intake, and a rev 9 intercooler +stage 2 jb4 and i was wondering what else do i need to be able to run 30% e85 and the rest on 91

FlexFuel Wires Found HERE

.

[FThirtyFive]

I'd get BM3 if you're really serious about E85. You just need a backend flash to get most out of it with tye JB like the N54 guys do.

[J_MENIS]

BMS recommends not using more then E30.. But I've stepped up to E40 and send the logs in to Terry and he says everything looks good

[J_MENIS]

Originally Posted by FThirtyFive

I'd get BM3 if you're really serious about E85. You just need a backend flash to get most out of it with tye JB like the N54 guys do.

+1

I plan on doing this once I free up some funds
#collegelife

[oEthanol]

Originally Posted by J_MENIS

+1

I plan on doing this once I free up some funds
#collegelife

You dont have fuel trim problems? As in maxing them out?

[sicmadek]

Not to thread jack but how much extra fuel consumption is expected with using e30-e40?