I am switching my ta over to e85 and wanting to know what my target e85 afr should be under boost. On 93 octane I run it around 11.5 to 11.7 from 4500 to 6200 rpms. I am going to run my wideband on a gas scale so 7.0 is equal to 10.5 afr. 7.0 is what I am hearing as being rich side afr under boost for a e85 car. Is this correct? What is everyone running in their e85 cars? Thanks for the help.
I asked a similar question on performancetrucks.net and most said they still shoot for 11.5 on the gas scale, or .78 Lambda.
I have my truck set to command .76 Lambda or about 11.2 on the gas scale. It's a turbo 5.3 running about 10 psi.
Have you had good luck with that afr? I dont want to hurt anything. Thanks.
My car likes .78-.79 lambda....11.5 on gas scale
I've read on yellowbullet that you can go pretty rich with E85 as long as you have enough ignition to light it off. I cut a spark plug open last night and my fuel ring at the bottom of the porcelain looks pretty good.
I do plan to adjust the fueling at the track(up/down) to see what it likes best...
What I've noticed is that typically the people saying you can go really rich are running high boost. I have noticed that (on my car) E85 does not like those super rich mixtures. However, I have also noticed that cars that typically run higher boost (imports) can see gains by adding fuel at higher boost levels
That makes sense. I started it up this evening on the e85. I change the afr to 9.75 and started it up. The long terms are pulling -15% out at idle and a few other areas off idle. I didnt really drive it, but am going to make some changes in the ve table then drive it on Wednesday. I am looking forward to it. Thanks for the help. JoshOriginally Posted by Milan
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