[bb2405]

My friend had the n54 335i w/ jb4 and is running e85 and loves the performance gains.

I'm running the jb 3 stage 1 and am wondering if I can also run on e85 mixed w/ 91 octane?

[alextremo]

Unless you can adjust your tune for the change in octane I don't think you'll see much benefit. Didn't you just post about throwing a CEL with your tune? I wouldn't change anything else until you get that sorted and have everything working properly, regardless.

[bb2405]

Originally Posted by alextremo

Unless you can adjust your tune for the change in octane I don't think you'll see much benefit. Didn't you just post about throwing a CEL with your tune? I wouldn't change anything else until you get that sorted and have everything working properly, regardless.

I found out it was just an "emissions" light from the cats being worked harder and it actually went out so all is good now.