Running E70 on E85 Tune?

[Dsm96GSX]

I just recently got my car tuned to E85, but now its winter/spring season so only E70 is available. Would it be safe to use E70 on my E85 tune? And if so can I still go WOT?

 

[ErikTande]

You'll likely need to adjust your tune. How are your AFR's? Any knock? Post a log if you have one.

 

[pneumo]

You're tune won't be too far off. I've seen that the benefits of ethanol start to taper off around E60, or 60% ethanol. There's still some benefit to running full E85, but cold weather also helps reduce knock anyway. The quick and easy answer is to turn the boost down 1 or 2 psi and you'll be good for a street tune. Of course, if you want a max power kill tune I'd find a good tuner and schedule an appointment.

 

[Mello]

I'd think you'd be fine. There's more gas & less ethanol in E70 so, if anything, you will most likely be running a little richer than with E85. Also this may help some in colder climates & cold start with a little more gasoline in the fuel.

 

[pneumo]

Yeah, you'll be fine at WOT. Just watch the fuel trims and lean it out a little so it still drives nicely during startup and cruising.

 

[Laoster]

ECMLink is compatible with an ethanol content sensor. They sell a cable to add the sensor to allow the ecu to run dual maps (pump gas + ethanol) simultaneously. Never have to worry about the ethanol content ever again. It automatically adjusts fuel trims.