Thread: Running e85 on stock fuel system

Originally Posted by darkhorizon

For reference on "it will probably run bad"

The race cars with turbos... run 18:1 afr at cruise with lower than gas egt.. on stock timing.

I have tested wot afr from 10.5 to 13.5 with very little power difference inbetween. Not to say there are situations where you would want rich or lean setups but for the "I wanna run e85 and a smaller pulley" guy its going to work fine.

So you ignore the injector offsets and just adjust other fueling to sustain your Afr then?

Originally Posted by 91parkave

So you ignore the injector offsets and just adjust other fueling to sustain your Afr then?

hes saying with 42.5s yes. 42.5s are around 30% bigger and with E85 you need 30% more fuel so with a stock tune, E85 and a set of 42.5's it might run perfect. If the injectors dont quite flow rated volume or flow more, if your "E85" is more like E75 or any other factors, it might run like **** or run your LTFTs off the scale. If you already have a tuner I see no reason to not just dial everything in correctly in the PCM.