Lund e85 tune but only have e70

[jakefed4]

Went to my e85 pump about an hour away from me I put about 10 gallons of it in two 5 gallons gas tanks. It measured at e70, definitely a little low. Is it not even worth it putting the e70 in the car? I have a lund e85 tune (not flex fuel). Tuner said the car would run ritch and be a little quirky. Will the car be safe on e70 is mainly what I need to know because I have to get rid of the 10 gallons somehow

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[mejohn50]

Just drive easy until the fuel in the tank is gone and you'll be ok.

To give a perspective on if E70 is worth it...yes it is as long as the fueling is tuned for it. In my flex fuel tune I have it set to give me max power by 65% ethanol, and I know some others do it as low as about 50% ethanol.

 

[LOL WUT]

E 40, 70, 85 all provide pretty similar knock protection. E70 should not be a concern unless your tune is extremely aggressive. Before getting pure E85 pumps locally, my Lund tuned Mustang consistently saw E70s without issue.

 

[jpjr501]

My pump E85 station is in between 70-80%. It's always going to be lower at the pump. I bought some real E85 in a 5G can and that's when my car made the hardest pulls ever. BUT...it was $10 a gallon. I don't want to start stocking Ignite at my home garage. My wife will love that.

This latest fill up on Sunday was 75%. The tune will take timing out depending on what octane the knock sensor is getting. Nothing we can do about it. I can smell the exhaust and know right away how much ethanol is actually in the car. I've been doing this for a year now and my car only runs on E85.

 

[WildHorse]

E 40, 70, 85 all provide pretty similar knock protection.

Good point. If I may add, you'll get all the knock protection @ e30, above that, it's all cooling effect.

 

[diambo4life]

That's more than adequate. My truck made 900whp+ on probably E60...lol.

 

[K4fxd]

I wouldn't sweat it. Like has been said E70 has good enough knock protection and the fuel trims will compensate for the slightly less alcohol.

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