idoke1

iTrader: (5)

I might as well chime in. I have been running 3-4 gallons of e85 mixed with 91 octane premium gas since the beginning when this topic started. I always filled it up when the gas meter points very close to the E. I have since driven 8k miles and I have to say it has work very well. The engine is ALOT more responsive. I am running with the rr-racing tune with no cats in place. My KCLV is in the 23 range and I can't stress this enough, it's a great improvement over the crappy gas we get here in CA. The only negative so far is it gets less MPG. On average with the blend of e85/91 octane, I get around 15 mpg city and 22-25 mpg on hwy. With 91 Oct, i could get as high as 17 mpg city and 29 mpg on hwy. That's all base off my driving style

eyzz21

I got traumatized from running an E30 mixture and blowing my high pressure fuel pump on my 335i. But i guess i can't compare apples to oranges. Will try a small blend this weekend!

minator

CBR169

had a FBO 335i with the same problem along with other problems, sold it to get my first ISF, sold it and whent throught a few cars (E60 M5, FB EVO), and getting another one today, gotta say the ISF is the best all around car but headache free does it most for me

BTW the high pressure pump was common failure and at times covered under warranty

sc3dreamin

iTrader: (1)

So just to clarify, the ISF ecu is smart enough too sense alcohol content (e85) and adjust the tune accordingly?

The stoich point of Ethanol is way different than gasoline

liquidtek

I think to some level it is but only adjusting incrementally. Going from 91 to e70 isn't suggested, probably need to gradually increase ethanol to that point each fill up. I've been adding a gallon more of e85 each fill up and trying to data log the lambda levels from the o2. But since its winter here in CO the process isn't going to quick. Like a few of the other mile high guys I been running e30 blend for over a year and my KCLV numbers were far better than just 91.

ImportISF

iTrader: (9)

Same here lol, the fuel injectors gave out within a month after trying E85 on my 335i. That was the most expensive repair during my ownership

sc3dreamin

iTrader: (1)

Naturally, E85 has a higher octane rating and much better resistance to detonation than 91 octane

lobuxracer

iTrader: (2)

No. It isn't. Lexus does not recognize any fuel with more than 15% alcohol content and the seals in the fuel system are not going to tolerate more than 15% alcohol in the long run regardless of "I ran it for xx,xxx miles without issue".

Htony

Manuals of all vehicles I have driven since '90s required premium fuel. They states in case of Ethanol blended fuel,
I recall no more than 10%. Some are classified as Flex fuel vehicle whatever that means. I never had one of this.

AndrewISF

I've read some of the long term effects of running ethanol is the affect it has on rubber components. Now, seems like most folks are running an e30 blend opposed to e85 so I can see it taking longer for the effects to present themselves. Just wondering if anyone has experienced any of the negative affects of running a higher than manufacturer recommended blend.

sc3dreamin

iTrader: (1)

Gotcha, I didnt think it would but have been reading about people running it multiple times on this forum

jdmSW20

iTrader: (12)

That's where I always stood on it as well, the long term effects that high of alcohol content will have on components not rated for that high of content. Kind of like folks who run e85 with walbro 255 pumps and wondered why it ate itself after long term use

glerink

Appreciate all the daredevils since 2016, just finished reading this whole thread.
Amazing information maybe I'll give it a go one of these days I got a local gas station that has e85

Bigjon3475

iTrader: (2)