I've noticed with my tune I actually run less timing on e85 than I do on 93. On 93 octane it's pretty constant at 28.5-29, and the knock sensors are very happy, on E-85 it is at 27.5 degrees timing advance, with the knock sensors behaving the same way. I was under the impression that one of the benefits of e85 would be safely running more timing? Not that I think that anything above this level would really add much in terms of power, just curious. The only thing I can think of as a reason why is that on 93 octane, Lambda is .82 and on e85 it runs a little leaner at .85-.86?

 

I'll be honest with you, all you'll pick up on a 11-14 with e85 is some low end and maybe 4-5 horsepower from the e85 cooling combustion. Outside of that you're not really going to pick up much power.

That being said, your tuner would need to look at why it's running less timing on e85. It's all up to the timing caps they've set.

All the timing you'll need can be run on 93 on an 11-14 anyways.