Hi everyone, on my car I only have minor bolt ons, just headers and an intake. First off, does anyone know how much more power a relatively stock c5 will make with e85, like is it worth it? I should note, in the future I do plan to build up the car, so I know eventually it will benefit, Im more wondering about the benefits with its current set up. Secondly, what do I need to change out in order to safely and effeciently implent an e85 set up in my car?

thanks,
kody

 

not worth it in my opinion... add big power mods like a supercharger or turbo then it makes more sense

 

I think there is a little something to be had, but not much. The cost of converting it and fiddling with it will not be worth it on an N/A motor. FI is a whole different ball game. The 2018 Mustang GT's are seeing significant gains N/A, but I'd attribute that to the addition of direct injection in the 2018s. Direct injection AND FI make E85 a huge power adder.

 

not only will the gains be minimal on an n/a setup (even more so on a stock engine) flex fuel also isn't that simple on c5's... some cars all you need to do is get a flex fuel sensor and a retune, on the c5 you will also have to do some pcm changes to get it to work which won't be cheap unless you do it yourself... there is a flex fuel kit that piggy backs off the injectors and has it's own controller but I'm skeptical about that setup... the other option is to run it on ethanol full time and tune for it which is what I did but you won't be able to run regular pump gas unless you reflash the tune for it... if you run high concentration of ethanol you really should think about swapping the injectors and pump, ethanol is corrossive and will rust out the internals of those parts if left exposed to it for extended periods of time... depending on the setup you might have to swap those parts anyway because it requires about 30% more ethanol to produce the same energy as regular gas, basically if your fuel system is capable of supporting 500hp you will need 30% larger injectors and pump to support that same 500hp on e85 and even larger if you want to support more power... gas mileage will also suffer because of the added demand, just some things to consider... like I said it isn't a good idea to start there in my opinion, put the money towards other things that will yield better results for the money spent