Gonna experiment with running E85.
02-20-2008, 11:05 AM
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Gonna experiment with running E85.
We finally have some E85 stations around, and since my ECU will let me use it, I'm gonna give it a shot. I'm not worried about the fuel lines and injectors, they should be OK. There are a bunch of people running older Audi's on E85 but I don't think any A4's.
I will have a switch mounted in the cabin which switches between a gasoline map and an e85 map incase I need to fill with regular gas. Not as elegant as a flex fuel sensor but that's too much work. I always keep a laptop in the car incase I run into any issues as well.
Not going to run it all the time (just 1 tank to start)
I am expecting to get flamed for this, but I don't care
Open to any suggestions as well.
I will have a switch mounted in the cabin which switches between a gasoline map and an e85 map incase I need to fill with regular gas. Not as elegant as a flex fuel sensor but that's too much work. I always keep a laptop in the car incase I run into any issues as well.
Not going to run it all the time (just 1 tank to start)
I am expecting to get flamed for this, but I don't care
Open to any suggestions as well.
02-20-2008, 11:24 AM
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Yea...we'll see.
One thing I just thought of is that it's not really E85 in the winter, it has more gasoline, E70 or something? But I don't know the ethanol/gas mix which would throw off tuning. I might wait till it gets warmer out, but I'm definitely going to play around with it.
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02-20-2008, 12:03 PM
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Don't really need to re-map...
The main fueling calculation in my ECU is based on the size of the injectors, displacement, and the AFR for stoich (currently 14.7) This gives me a "required fuel" value of 4.8 ms. (total amount of fuel injected per cycle of the engine) All I would have to do is change the stoich value to the value of E85 which is around 9.7:1 AFR, and it would increase the fuel to the engine accordingly. I won't actually have to change the fueling map (perhaps a little bit, since it has different characteristics, but not much at all)
02-20-2008, 12:25 PM
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Yep...SE white. I think I'm gonna take the flames off.
prior bikes... ninja 250 and 03 sportster 1200. I'm a fatass and wanted a big, heavy sport touring bike good for long trips that doesn't get blown all over the expressway. I don't like the concours so this was the next step (down? lol)