How does flex tune work?

[Wookie107]

I haven’t come across a definitive explanation yet: How does a flex tune work? Can I run 93, then fill up with e85 and just fire up and go? I thought I saw a tube you vidya that said you need to idle for a bit while the computer relearns. If I run e85 for several tank fulls on a flex tune, is that any different than a dedicated e85 tune? Same hp at the end of the day? Thanks for the explanation!

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[Mike-S550]

I haven’t come across a definitive explanation yet: How does a flex tune work? Can I run 93, then fill up with e85 and just fire up and go? I thought I saw a tube you vidya that said you need to idle for a bit while the computer relearns. If I run e85 for several tank fulls on a flex tune, is that any different than a dedicated e85 tune? Same hp at the end of the day? Thanks for the explanation!

“I thought I saw a tube you vidya that said you need to idle for a bit while the computer relearns.” Yes.

“If I run e85 for several tank fulls on a flex tune, is that any different than a dedicated e85 tune? “ I can’t speak for all tunes, but for the tune from Lund, yes, the tunes are said to be different.

 

[LOL WUT]

https://www.mustang6g.com/forums/threads/help-me-understand-e85.178856/

^^Lots of good E85 information covered in that post.

 

[K4fxd]

You don't have to idle it but most do because they look at the dash display and freak out when it shows 17 to 1 AF ratio. If you are also logging you will see that it is adding 30% fuel and the "lambda" is 1 or stoich. Which is what it is supposed to be.

You don't have to let it idle.

The max power of a flex tune and most dedicated tunes are the same. The difference is mid range rpm areas, the dedicated has more spark timing.

 

[Wookie107]

Mods, please close/delete this thread. The “ Help me understand e85“ thread has it all.

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