E85 Target AFRs ?
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E85 Target AFRs ?
Put the car back on E and ran some logs. 16 lbs I'm running between 11.40-11.60 AFRs.
Checked my logs from last year and at 23 lbs I was in the 10.50s range. On this same 23lb log I was mid 10s afr (for those split seconds until I hit my target boost) from 14lbs on up until it hit 23.
I did have a fuel filter issue last year, changed it and all was well.
Some details with E I question including this topic. I was always under the impression you wanted to be on the rich side with ethanol. But I'm unsure what my target afr is for 16lbs of boost compared to 23. I am worried to be mid 11s on E at 23 lbs of boost so I didn't keep cranking it up until I asked you guys.
Anyone any input ?
Checked my logs from last year and at 23 lbs I was in the 10.50s range. On this same 23lb log I was mid 10s afr (for those split seconds until I hit my target boost) from 14lbs on up until it hit 23.
I did have a fuel filter issue last year, changed it and all was well.
Some details with E I question including this topic. I was always under the impression you wanted to be on the rich side with ethanol. But I'm unsure what my target afr is for 16lbs of boost compared to 23. I am worried to be mid 11s on E at 23 lbs of boost so I didn't keep cranking it up until I asked you guys.
Anyone any input ?
Joined: Sep 2012
Posts: 3,299
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From: Greenwood, AR
Mid-11's (gas referenced) is ideal on E85 and boost.
You do run more physical fuel with E85, however, when lambda is converted to a gas scale, you can actually run E85 leaner than gasoline. I generally target around 11.5:1 on E85 with Subaru's (many will run it up to 12:1). You could probably lean it out to 14:1 without knock, however, you'll lose power and your EGT's will climb high.
You do run more physical fuel with E85, however, when lambda is converted to a gas scale, you can actually run E85 leaner than gasoline. I generally target around 11.5:1 on E85 with Subaru's (many will run it up to 12:1). You could probably lean it out to 14:1 without knock, however, you'll lose power and your EGT's will climb high.
Thread Starter
Registered User
Joined: Feb 2010
Posts: 1,177
Likes: 0
Mid-11's (gas referenced) is ideal on E85 and boost.
You do run more physical fuel with E85, however, when lambda is converted to a gas scale, you can actually run E85 leaner than gasoline. I generally target around 11.5:1 on E85 with Subaru's (many will run it up to 12:1). You could probably lean it out to 14:1 without knock, however, you'll lose power and your EGT's will climb high.
You do run more physical fuel with E85, however, when lambda is converted to a gas scale, you can actually run E85 leaner than gasoline. I generally target around 11.5:1 on E85 with Subaru's (many will run it up to 12:1). You could probably lean it out to 14:1 without knock, however, you'll lose power and your EGT's will climb high.
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