E85 tuning
 

of all the research and threads I read about tuning with E85, I understand that you have to tune the car to see lower AFR's if I wanna run 14.7 I have to tune to see 9.1 when using e85.
am I misunderstanding this? does it means that on my wideband readout I need to see 9.1 or I need to see 14.7 ?
I did some thinking, and what I am understanding makes no sense to me.
so my thinking came up with this. if I tune the car to read 14.7 AFR on the wideband, the actual AFR that the car will be using is 9.1 AFR while using E85 correct me if I am wrong.
please break it down gentle for me at tele tubby level.
I used e85 before, but becuse of my misunderstanding I was running the wideband at 10.1 afr usng a 50/50 mix of gas and ethanol.

please only educated replies, thank you.

Re: E85 tuning
 

Stoich is at a different ratio for E85, you tune your wideband to that ratio. Throw 14.7 out the window. Hope your injectors are up to the task :6

Re: E85 tuning
 

what about a 50/50 mix of e85 and 93?

Re: E85 tuning
 

since lambda is set for gasoline it'll read just like gasoline. 14.7 actually is 9.1...simple

Re: E85 tuning
 

thats the answer I am trying to hear, but due to the lack of straight forward info I read too much into it. all I wanna know is do have to tune to see 9.1 AFR on the wideband, or 14.7.

Re: E85 tuning
 

14.7 cause like I was saying. Your lambda is set for gasoline, Im actually running on e85 right now, good stuff, 2 degrees advanced timing and 2.5 degrees in boost. It just reads normally, 14's means Im at stoich point...11-12's means Im hitting boost

Re: E85 tuning
 

e85 = 85% ethanol 15% gasoline

50/50 mix of gasoline and e85 = stupidity!

Re: E85 tuning
 

how is that stupidity? if you run 1/2 tank of gas and 1/2 tank e85 aren't you just changing the %

Re: E85 tuning
 

It would be like 65% gas 35% ethanol! so e35!

Re: E85 tuning
 

you're not good at math are you?