E85 30% / 93 70%

[nnguyen04]

Been running this mixture for the past month along with JB4 Map 5. Power output is great and very addicting.

Logged my car and saw fuel pump plausibility. Didn't worry me much since I got that code every now and than.

What I'm really worried about are the injectors. My car is about 67K, Should i worry about the long term affect of E85 on my fuel system? Car has intake, full exhaust, and DP (coming soon)

Any input would be great! Thanks!

[bmw0bsession]

subscribed, curious to know too

[Colt]

I was using E85 + 93 mixture for a while and ended up getting a misfire. Turned out to be injector #5. Stopped using E85 and haven't had any problems since - don't know if the E85 was a cause, or part of a cause, to the issue or not

[135Pats]

Ive been running E30 for a few months with zero issues, other folks have run up to E85 without serious problems. The concerns over fuel line corrosion are logical but IMO over stated, modern cars shouldnt have an issue with something like E50. I could def. see an injector rusting in a worst case scenario, but again its just not an issue you see popping up much. N54 users have been using more and more Ethanol for several years now, at least anecdotally im not seeing many issues with it. Personally im more worried about my LPFP and the fueling systems ability to meet requested PSI.

One thing I do is run a good half or full tank of 93 pump through the car every month or so. Cant hurt to "flush" the lines with pump gas. Also, do what you can to avoid having Ethanol sit too long in your gas tank. IE if youre about to leave for 3 weeks on vacation, dont have ethanol sitting in the tank.

[nnguyen04]

I monitor my AFR while im on it, pretty steady so as far as i can tell my fuel pump is keeping up. Yea im most definitely worried about my Injectors ... but seen some people run e85 at 50% for like 40K miles lol. SO maybe not much to worry about.

Terry said 30% is safe for everyday use. So i guess i'll just stick with that.

Question tho - how do you typically fill up? I normally wait till im at the last quarter than pump 93 than e85. Not sure if im accurately measuring the rate tho.

[135Pats]

Originally Posted by nnguyen04

I monitor my AFR while im on it, pretty steady so as far as i can tell my fuel pump is keeping up. Yea im most definitely worried about my Injectors ... but seen some people run e85 at 50% for like 40K miles lol. SO maybe not much to worry about.

Terry said 30% is safe for everyday use. So i guess i'll just stick with that.

Question tho - how do you typically fill up? I normally wait till im at the last quarter than pump 93 than e85. Not sure if im accurately measuring the rate tho.

E30 should be fine, I really wouldnt worry about that.

I wait until im almost out of gas then I fill about 4.2 gallons of E85, the rest 93 pump. Let it mix for a minute or two (just dont drice super aggressively) then youre set. You get in trouble measurement wise when you add in E85 to a partially full tank.

[Miko226]

I have also wondered if there were any long term affects more so than normal gas..
I have ran a few tank's now with 30% mixture and it feel's great i don't run it all the time will i run into problems switching back to all 93 if i only do about 1 e85 mixed tank a month?

[Venom]

I wouldn't worry about the 2aaf code unless you have any other associated symptoms http://www.n54tech.com/forums/showthread.php?t=16700

And that mixture ratio is fine from what I've seen on local cars.

[Dmacc]

Originally Posted by 135Pats

Ive been running E30 for a few months with zero issues, other folks have run up to E85 without serious problems. The concerns over fuel line corrosion are logical but IMO over stated, modern cars shouldnt have an issue with something like E50. I could def. see an injector rusting in a worst case scenario, but again its just not an issue you see popping up much. N54 users have been using more and more Ethanol for several years now, at least anecdotally im not seeing many issues with it. Personally im more worried about my LPFP and the fueling systems ability to meet requested PSI.

One thing I do is run a good half or full tank of 93 pump through the car every month or so. Cant hurt to "flush" the lines with pump gas. Also, do what you can to avoid having Ethanol sit too long in your gas tank. IE if youre about to leave for 3 weeks on vacation, dont have ethanol sitting in the tank.

+1, if I run straight e85 for 4-5 tanks, by the 5th tank things start to feel a little sloppy and sluggish. So I'll run the tank dry and fill up with only 91 octane, and usually one full tank of 91 takes care of my sloppy feeling I get.

I fill with 91, reset adaptations for pump gas, then when I'm ready for e85, I fill her up, and leave the adaptions untouched from the pump gas reset, always solves my problem. There is a caramel like sticky residue that gets left at the tips of my injectors after running straight e85 for a while, especially in high heat. I'm Guessing that the techron in my pump gas is doing a great job of cleaning the residue out each time.

[nnguyen04]

^ yea i notice that too! guess ill run 93 on my next pump. Reset adaptations? in the jb4 gui?

[Dmacc]

Originally Posted by nnguyen04

^ yea i notice that too! guess ill run 93 on my next pump. Reset adaptations? in the jb4 gui?

Haven't ran a JB4 in a long time, I believe there is a way to reset adaptations with the CANbus steering controls. Not sure on this though. But yes, fill with only pump gas, drive a few miles from the station to clear the lines of the e85(but don't do any spirited driving). Then pull over when the time is right, and reset the adaptations. The car will feel a little laggy maybe at first, but after a few miles it should feel smooth, VERY smooth, this works on my n54

On a side note, another thing to Check that would be a good idea is your lpfp pressure. You can log it with the jb4 user software. I believe if it falls below 50psi, that means you should either think about a replacement, or upgrading your lpfp if you plan to run stronger mixes of e85.

[135Pats]

^100% on the above RE: LPFP. If its dipping much below 50PSI for an extended duration, you need to throttle back the ethanol or upgrade the pump. The car isnt able to meet requested PSI, so HPFP PSI usually takes a nose dive and you can run short on trim. Really important to log with e85, our motors go bananas over the octane and cooling properties, but you can run into fueling issues and worst case scenario lean outs.

[Papa13]

Are you running jb4 G4 or G5??

I have jb4 g4 and want to make sure I can run e85..?

Thanks

[nnguyen04]

dont matter just switch to map5 and youre good.

[MIAblu1]

I'm curious... I'm reprogrammed by a local tuner with all supporting bolt ons minus front mount and I was toying with the idea of running a 30% E85 & 60% 93 octane mix. Think it's give any issues? Local shop said it shouldn't but I wanted to hear from those who log data and such.
My car was reprogrammed via laptop not a chip like JB or anything.

[Dmacc]

Originally Posted by MIAblu1

I'm curious... I'm reprogrammed by a local tuner with all supporting bolt ons minus front mount and I was toying with the idea of running a 30% E85 & 60% 93 octane mix. Think it's give any issues? Local shop said it shouldn't but I wanted to hear from those who log data and such.
My car was reprogrammed via laptop not a chip like JB or anything.

You won't see any change except less timing drop outs if you're running your pump gas tune. You need your tuner to make you a custom 30% Mix map in order to utilize the fuel and see the most gains.

[MIAblu1]

Originally Posted by Dmacc

You won't see any change except less timing drop outs if you're running your pump gas tune. You need your tuner to make you a custom 30% Mix map in order to utilize the fuel and see the most gains.

Thanks, going to inquire with them about that.