What is a dual tune?

[rosalez619]

I'm getting a cobra that is currently tuned for E85 only. However, the owner says it can be "Dual Tuned" for regular gas. If it's dual tuned does it mean that it can still run on E85 until the tank empties and then I can switch back and forth from E85 to regular gasoline as long as I don't mix them? By regular gas I mean 91 octane.

 

[Black02GT]

You can't have one tune for both, but you can have two tunes on the handheld and reflash when you change fuels. It's really not the best idea to switch back and forth but I have a 93 tune in case I yet caught short and no E85 around.

I've seen posts on here about guys that switch back and forth, its smart to be a little gentle on the first tank after t g e switch. From E85 to 93 you'll probably be running a little lean, for 93 to E85 a little rich but not get the full octane and E85 effect depending on dilution.