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Questions about AFR @ WOT

 
Old 09-18-2018, 02:46 PM
  #21  
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Took it to the tuner, the fuel pump had a leak on the pick up tube.... So it wasn't pumping enough fuel at a higher rpm or wot... She should be good to go in couple of days! Thanks guys
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Old 09-19-2018, 07:43 AM
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Originally Posted by Gernby View Post
That's one of the few things about my tuning process that I like to keep to myself, since I'm not aware of any eTuners that do it at all. It seems that everyone just assumes the AF Corr value is correct, and uses it blindly. This works out fine for an "average" S2000 with an O2 sensor that sits in the middle of the range, but it sucks for the rest.

What I will say is that it's not hard to solve for an unknown variable if all related variables are known. Basically, you don't have to compare the OEM O2 reading to a "known good" O2 reading IF the other related data is correct.
I use the same logic when tuning. Only diff i do it on muscle cars. same concept.
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Old 09-21-2018, 08:24 AM
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I figure I may as well ask this question here. For E85, what’s an ideal AFR target for WOT/cruising? Trying to just clean my tune up a little bit without bothering my tuner cuz it’s a few simple things.
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Old 09-21-2018, 09:03 AM
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Same as for regular gas.
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Old 09-21-2018, 09:36 AM
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I thought E85 was more knock resistant and could have a higher stoichiometric mixture?
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Old 09-21-2018, 10:48 AM
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Yeah you could maybe get slightly better highway mileage if you lean it out some, if you are in to those kind of things
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Old 09-21-2018, 10:55 AM
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Very into the thought of better mpg because 15mpg is getting on my nerves lol. Luckily it’s a whole dollar less than 91 in my area.
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Old 09-21-2018, 01:29 PM
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Mine does 24 mpg quite easy with a 14.7:1 target AFR, this is with ITB's and an ethanol content mostly at 90% or more.
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Old 09-21-2018, 03:46 PM
  #29  
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14.7 is the most efficient for idle and little load under about 30% throttle per OE. After that generally speaking 13.2 makes the most torque and 12.5 for most hp. When deviating from this its due to artificially cooling combustion via richer fuel mix for some added safety margine. When running high oct or alternative fuel you dont have to compensate the same way and run closer to "lean best" for max power and efficiency.
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Old 11-06-2018, 01:55 PM
  #30  
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I forgot all about this thread, glad to see it’s helping people a little bit!
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