e85?

[A Frankfurt]

Originally Posted by TheHouseWon

I can safely run 4 gallons, then? I have jb4 bcm on 19-20 psi.

Thx

I don't think there has been any supportive evidence or enough professional testing to safely say that this platform is set to operate properly on E85 mixture.
Take the JB4 for the S55 (M3/M4) for example.
The JB4 harness has a fuel sensor connector that allows you to select a specific map to run E85. Even with that connector and set map, it is only recommended to use a few gallons of E85 and that is coming from BMS directly.
There are posts on the BMS forum where Terry has stated that there isn't enough testing done to use this safely.
All vehicles running E85..Porsche's, BMW's, Nissan GTR's..whatever.. it has an ECU program and or other parts installed for the E85.
There is no setting or fuel connector for the M5/M6 S63T JB4 harness.
But, the JB4 allows for control of fueling..adding/take away etc but its not just as simple as add E85 and drive off.
It all needs to be adjusted with logs or on a dyno.

Use at your own risk but just because your car feels "faster" doesn't mean it is right for the car.
Just my 2 cents on the topic.

[TheHouseWon]

For SD people we also have e85 in Kearney Mesa at the 76 gas station on Convoy and Kearney Mesa Rd.

A Frankfurt, thanks for the info. I wondered how jb4 adjusted for e85.

[NightM]

2 gallons E85 on full tank of 93 for my slow map still feels like racecar.

1 gl on 1/2 of 93

[sly1types]

The biggest problem with E85 there is less energy so you have to flow about 30% more. On my F30 335 I have a flex sensor that has to be plugged in.

I wouldn't run very much unless some comes out with a tune for it.

[Msizzle]

being that people are running it without a tune and not injecting more fuel can't you make less power?? As someone stated above you need more volume of e85 to make the same power as gasoline, the advantage is the octane not how much power burning it makes. You normally off set this on other cars with bigger fuel pumps,larger injectors, and of course a tune that tells the car to command a higher volume of fuel

[Msizzle]

i wouldn't be surprised if on a stock tune the car isn't actually making less power than on pump 93, the main advantage to e85 is octane. The reason you can make power with it is the ability to run more boost without getting knock or detonation. But on a stock tune you are not running any additional boost and you are burning a less powerful fuel. The only advantage may be the ecu can run a little bit more timing. Now with a custom tune this all goes away because you can program the car to command more volume of fuel and there for make up for the deficiency of it being less powerful than 93 while still getting the octane advantage to run more boost safely.

[NightM]

Yup! Get a Vp 5gl jug clear one and u can store that and just dump 2 gl in your tank of 93. I have blue jugs also for straight Race gas.

My gas station is about less than a mile so sometimes instead of carrying a whole 5 gl jug. I put them on temp bottles till i get gas

[LI-M5]

thought i'd chime in , i have bms filters , rpi scoops , jb4 newer one w out bcm and i usually run about 6 gallons of e85 like errytime i fill er up lmao !

the diff in seat of the pants power is nite/day !! Now i will caution i don't know if this is safe or not lol but it sure is funn and noticeable ! i've been do this for the last 12 mo's or so w no issue's except for the wide open throttle in sport + mode drivetrain malf.. in addition the bangs and pops from the turner pipes are much louder and sexxier !

as someone else stated it burn's alottttt faster so my gas mileage is still same at like 220-240 p tank but ny 1/2 -1/4 i can notice the car is def slower !

NEIL

[TheHouseWon]

Originally Posted by LI-M5

as someone else stated it burn's alottttt faster so my gas mileage is still same at like 220-240 p tank but ny 1/2 -1/4 i can notice the car is def slower !

NEIL

I don't understand this...your car gets slower when you reach 1/4 tank?

[BPMSport]

Went to Palm Spring last weekend with 6 gallons of E85 and our Stage 1.5 software. Pulled hard in 115 degree heat with the AC blasting. She's quite a machine

[DATM3]

I used 4 gallons of E85 in my M6 when I took it to Road Atlanta and it felt awesome. I have also tried using 90% E85 on my M5 before and it made it bog down. As E85 has higher octane it requires more amount to produce the same energy. I Therefore, I believe when you run too much E85 our fuel injectors are maxed out and its unable to provide enough energy. However, I think our fuel injectors are able to pump more fuel through possibly 20-30% more so the car responds well to the 4 gallons of 85 and the rest 93 octane fuel. For my F80 M3, I put 3 gallons of E85 and the rest 93 and the car felt awesome as well. The power difference from the butt dyno was very noticeable with the proper mixture.

[erm324]

Originally Posted by LI-M5

thought i'd chime in , i have bms filters , rpi scoops , jb4 newer one w out bcm and i usually run about 6 gallons of e85 like errytime i fill er up lmao !

the diff in seat of the pants power is nite/day !! Now i will caution i don't know if this is safe or not lol but it sure is funn and noticeable ! i've been do this for the last 12 mo's or so w no issue's except for the wide open throttle in sport + mode drivetrain malf.. in addition the bangs and pops from the turner pipes are much louder and sexxier !

as someone else stated it burn's alottttt faster so my gas mileage is still same at like 220-240 p tank but ny 1/2 -1/4 i can notice the car is def slower !

NEIL

Its not recommended running E85 with the JB4 alone - you need a full reflash or meth to be able to safely run an E85-mix.

[Msizzle]

Originally Posted by DATM3

I used 4 gallons of E85 in my M6 when I took it to Road Atlanta and it felt awesome. I have also tried using 90% E85 on my M5 before and it made it bog down. As E85 has higher octane it requires more amount to produce the same energy. I Therefore, I believe when you run too much E85 our fuel injectors are maxed out and its unable to provide enough energy. However, I think our fuel injectors are able to pump more fuel through possibly 20-30% more so the car responds well to the 4 gallons of 85 and the rest 93 octane fuel. For my F80 M3, I put 3 gallons of E85 and the rest 93 and the car felt awesome as well. The power difference from the butt dyno was very noticeable with the proper mixture.

The injectors are capable of pumping the additional fuel but the ecu won't command it, the car doesnt know that you are running a fuel that makes 30% less power. If and when we get e85 tunes then this will be the way to go.

[Msizzle]

Anyone do a before and after dyno with this fuel?

[DATM3]

Originally Posted by Msizzle

The injectors are capable of pumping the additional fuel but the ecu won't command it, the car doesnt know that you are running a fuel that makes 30% less power. If and when we get e85 tunes then this will be the way to go.

I think what you say is true for older cars, but I believe the modern ecu's are capable to adapt and adjust to a certain extent. I mean almost all gas you purchase has up to E10 in it, I am sure BMW has sensors that can detect the level of ethanol to adjust the amount of fuel it needs to pump through during fires. So if it reads a higher content of ethanol it should therefore adjust to pump more fuel to fire accordingly. A tune sure will increase the output as the max limits can be increased.

[LI-M5]

Originally Posted by TheHouseWon

I don't understand this...your car gets slower when you reach 1/4 tank?

yes absolutely , the e85 burns much faster so when its mix'd the way i do 6 gall's to a full tank of 93 by time i reach a 1/4 tank the e85 is essentially gone i believe ! haha i don't know the science but it's a noticeable diff in seat of the pants for sure !

also in 2nd gear in sport + @ 20 if i punch it i can easilly break the tires loose and ripp weel's when the e85 is not in the car or im low on gas i def cant do that !

like i said idk if its safe or not but i've been do it for atleast a year when i tried it once and instantly fell love w it so i continue to do lmao

NEIL

[MuffinFlavored]

Originally Posted by NightM

2 gallons E85 on full tank of 93 for my slow map still feels like racecar.

1 gl on 1/2 of 93

So... my friend did the math, tell me if this is wrong:

21 gallon tank
2 gallons of E85 (103 octane)
19 gallons of 93

Weighted average makes the tank effectively like 95 octane... is it really that big of a difference?

I just put 2.5g in my car fully stock (no tune). People were saying it might throw codes, kill fuel pumps, kill fuel lines. I'm not seeing that. Is that true?

[MuffinFlavored]

Originally Posted by LI-M5

yes absolutely , the e85 burns much faster so when its mix'd the way i do 6 gall's to a full tank of 93 by time i reach a 1/4 tank the e85 is essentially gone i believe ! haha i don't know the science but it's a noticeable diff in seat of the pants for sure !

also in 2nd gear in sport + @ 20 if i punch it i can easilly break the tires loose and ripp weel's when the e85 is not in the car or im low on gas i def cant do that !

like i said idk if its safe or not but i've been do it for atleast a year when i tried it once and instantly fell love w it so i continue to do lmao

NEIL

Would love to hear how this panned out almost 9 months later.

[NightM]

Originally Posted by MuffinFlavored

So... my friend did the math, tell me if this is wrong:

21 gallon tank
2 gallons of E85 (103 octane)
19 gallons of 93

Weighted average makes the tank effectively like 95 octane... is it really that big of a difference?

I just put 2.5g in my car fully stock (no tune). People were saying it might throw codes, kill fuel pumps, kill fuel lines. I'm not seeing that. Is that true?

Depends on car and tune u have if its toon for it

Mainly e85 is use to bring timing up for teh knock sensor not to drop afrs


E85 not use for octane booster like how u calculated 103 octane

[Ca86108]

I had a 135i and I ran e85 for years. I had jb4 and an upgraded fuel pump and ran 80% e85. I contacted bms and they said not to run e85. Do we just have to wait for an e85 tune to come out? What do I have to do to run e85? Is the bms stage one enough for 20% e85?

[MuffinFlavored]

Originally Posted by NightM

Depends on car and tune u have if its toon for it

Mainly e85 is use to bring timing up for teh knock sensor not to drop afrs


E85 not use for octane booster like how u calculated 103 octane

> E85 not use for octane booster like how u calculated 103 octane

Can you (or anybody) elaborate on that please?

[MuffinFlavored]

Originally Posted by Ca86108

I had a 135i and I ran e85 for years. I had jb4 and an upgraded fuel pump and ran 80% e85. I contacted bms and they said not to run e85. Do we just have to wait for an e85 tune to come out? What do I have to do to run e85? Is the bms stage one enough for 20% e85?

I don't understand. You had a JB4 and ran a ton of E85. Then you contacted BMS and they told you not to? Did you still do it? Why did they tell you no? Did you ever have any issues?

Where did you get the fuel pump, what kind was it, and how did you have it installed?