[335twins]

@Dzenno, I am pro tuned for e50, should I be worried running it without upgraded lpfp?

[924er]

Originally Posted by 007_e350

I've tried that I can affirm the timing corrections go away - the only down side is addiction

... I got so addicted my hpfp went out, bmw still covers it till 120k I believe ... & they test fuel to replace under warranty, I had to suck out and put in 93 to reduce e85% lol

lol how much e85 did it take to ruin your stock hpfp

[007_e350]

Originally Posted by 924er

lol how much e85 did it take to ruin your stock hpfp

6 months on 5 gals in every tank full whatever that comes out to

[M5Rlz]

Originally Posted by Glowin

I'm running Cobb 2+ Aggressive maps on my car, with 94 Octane that's got no ethanol in it. I've got an 2008 MT 335. During the 3rd gear WOT pulls, I see some timing drops of a few degrees. When I've added some octane booster, like Lucas, the drops go away.

Would adding some E85 to regular gas get rid of my timing drops? I've read here quite a few say it's got higher octane. I'm not totally sure because of the Wikipedia article that says it's only around 94 to 96 octane.

E85 has an octane rating higher than that of regular gasoline's typical rating of 87, or premium gasoline's 91-93. The Renewable Fuels Foundation states in its Changes in Gasoline IV manual, "If a retailer chooses to post octane, they should be aware that the often cited 105 octane is incorrect. This number was derived by using ethanol’s blending octane value in gasoline. This is not the proper way to calculate the octane of E85. Ethanol’s true octane value should be used to calculate E85’s octane value. This results in an octane range of 94-96 (R+M)/2. These calculations have been confirmed by actual-octane engine tests."

So would my plan work? Or should I just stick to half a bottle of octane booster with each tank?

Short answer is Yes e85 will clear it up in short bursts or per each tank.

I was getting as high as -6+ drops across MULTIPLE cylinders with my aggressive cobb stock maps.. I replaced plugs, coils, walnut blast, oil and still getting those timing issues...

My advice don't throw parts or mixing too much e85 with it [this fixed my issues instantly for a little bit, but without the welbro fuel pump you'll eventually mess with the stock fuel pumps because at least for me I started getting the ratios wrong.]


My advice a pro tune that accounts for your engine specifics would probably take care of these issues. Every engine is different some can take it all on stock maps, some spaz out a little bit.

[Jnat]

I guess that's a wrap!