On your 2007 it is controlled by the tune, there is no sensor... it uses the O2 sensors to detect a lean condition and it assumes that lean condition is caused by E85.

on your 2003, it may have a sensor inline on your fuel line, right next to the tank.

 

So in a sense you could set it up like the 07 if you wanted to run a dual setup?
What about that switchable tune thing KB was working on awhile back

 

are you talking about setting up your 03 like your 07? it won't work automatically on the 03 without the sensor...

the dual tune thing would work, all you gotta do is change your stioch to E85 stioch value and add in some timing

 

Sooooooooooo, today i filled up the tank... This time i did 2.6 gallons of E85 and 20 gallons of 93... I know the tank is 26 gallons that is why i did 2.6 . So far the trims have been averaging +5%, so that is well within tolerances... I will report back my MPG, last tank adding 1 gallon to half a tank i got 1mpg more and that was with no tuning changes...

 

Any updates? The station on base opens next week and will have E85...hoping you have good results!

 

I ran 25% with 93oct last night at the track. 15psi, 19* of timing and not a hint of knock!