What tune do you need for E85?
Table of Contents
We suggest completing a tune with fresh 91 octane gasoline first since this is most likely to already be in the fuel tank. Then, completely drain fuel tank and replace fuel with E85 (preferably E98). The in-tank fuel pump can be used (some ECUs allow the fuel pump to be turned on constantly) to drain the fuel tank.
Can you run E85 with just a tune?
You will absolutely need a tune to run E85, there are plenty of options available for top notch tuners for the coyote platform.

How much HP gain from E85 tune?
E85 fuel has a faster ignition time and flame propagation when compared to gasoline. This leads to higher cylinder pressure, as well as increased engine torque and power, gaining up to 20%.
Will 93 Tune work with E85?
The beauty about having a flex tune is you can run E10 93, E85, or anywhere in between.

How long does a E85 tune take?
Fuel pumps are normally a must-have, as well as 30 percent larger injectors (we recommend) than you would normally run for the same power level without E85. Plan another two to three hours in tuning to take care of the pesky problems (cold-start, hot-start, part throttle MBT) known with E85.
Why does E85 make more hp?
The E85 boosts the engine’s horsepower because of two factors: its amazing octane rating and cooling capacity. The octane rating indicates a fuel’s power to withstand denotation or knock. You cannot get too much boost with normal pump fuels because of denotation; hence the low octane ratings.
Does E85 make car louder?
E85 alone (even with a tuned engine) won’t make your car louder. It may change the way your exhaust sounds, but most of the time there isn’t a noticeable change in volume. Some car owners have reported a growlier sound with E85 and smoother running engine, but the sound isn’t louder.
Can you add E85 to 91 octane?
By blending pump premium (or 91 if you like) with E85, you can create a custom blend of high-octane fuel.
Can you run E85 on a stock car?
Running E85 fuel on the stock tune bumped that up to 244 hp and 308 pound-feet of torque. However, real gains often require fuel system upgrades. The reason is that ethanol has around 30 percent less energy content than gas. Thus, you need to inject more E85 to make the same power as a given amount of gasoline.