E85 has been a popular option among mustang enthusiasts since it was first introduced. You are able to make more power for a lower price than normal pump gasoline, and it’s available at many gas stations across the nation. E85 is composed of 85% ethanol and 15% gasoline. E85 has a higher octane rating than standard 93 premium gasoline, which allows you to run more timing and more boost over premium gasoline. E85 does have a few disadvantages as well. For example, E85 is not available at all gas stations and can be corrosive to a factory fuel system. It does have a higher octane rating, however, it does burn faster than gasoline so it will not be quite as efficient in gas mileage.
When converting your 79-04 mustang over to E85, there are a couple of things to keep in mind. You will need to upgrade your fuel injectors depending on your application as well as fuel lines and fuel pump. When upgrading the fuel pump, you will want to make sure that the pump is compatible with E85. Using a standard pump with E85 can cause premature pump failure. Aeromotive and Deatsch Werks both have great options when it comes to E85 compatible fuel pumps.
Another major factor when converting over to E85 will be the fuel lines. The stock fuel lines do a great job of fueling many different applications and power levels. However, when using E85, it is corrosive to the rubber fuel hoses and will cause fuel line failure rather quickly. It is strongly recommended that you upgrade to complete stainless lines and fuel hoses to withstand the additional flow needed when running E85 as well as it’s corrosive properties. A larger diameter supply and return line is highly recommended due to the added fuel required at wide-open throttle.
Once you have upgraded everything, that last thing to keep in mind is a custom tune. This will be required to have everything run properly and to take advantage of the higher octane fuel. In a boosted application, this will allow you to run more boost safely. When using E85 on a naturally aspirated application it will allow you to run more timing that you normally would with standard 93 gasoline.
Converting to E85 is a great option for those looking to get all the power they can out of their mustang. LMR.com is a great place for all of your E85 conversion needs!