Adam.c6

so I've read and read and done much research on running E85 and nothing but good has been said. I've got a stock 2013 in trying to get tuned to run E85 and I'm lucky to have near availability to a pump. but my question is, when I get this tuned for E85 can I run normal 93 as well or am I stuck with E85 until I re tune to run 93? any input is highly appreciated just no bashing, thanks

Adam

schpenxel

It is possible to plumb in/wire in a flex fuel sensor and have the computer automatically adjust stoich AFR based on ethanol content. You could also have a separate tune for each fuel and not need a sensor. I like the automatic idea better personally as the consistency of E "85" varies quite a bit. Lots of people have reported getting anywhere from E70 to E85..

Obviously both options assume you have the fuel system to support E85.

PM DSteck https://www.corvetteforum.com/forums...newpm&u=218214

Suds

When LMR in Houston worked on my car I was told they can install an ethanol sensor and program the ECU for ethanol percentage, this is on a 2008.

Dano523

Yep, the ecm/tune has provision to tune in a flex fuel sensor, but the car does not come with one OEM, so it has to be installed.


The pros and cons about E85, has a better octane rating (100-105), and you can push timing more with it to get more HP. The downfall, your going to burn about 30% more E85 instead of petro fuel instead, since it takes about 30% E-85 to get the same power as petro.


And yes, you want to have a flex fuel sensor installed, and the car tuned so it can run both petro and E-85 without a retune. The reason for this, you tune the car for e-85, and end up with e-70 in the tank instead, and your going to have HP problems as the car kicks into low octane rating instead.
Note, ECM/ Tune has two different octane tables as well. This allows the tune to kick into a lower octane table if needed from low octane fuel.

Orion2011

E85 requires a fuel system hardened against the negative effects alcohol has on the fuel system.