Fuel Ratio for E85?
What do you tune the fuel ratio for e85 for? I always thought it was the same as regular gas, you just have to add more fuel to get it to burn, but I've read some other things that say the fuel ratio should be closer to 9:1 or 8:1 instead of 11:1 which is confusing me. I've read some other stuff that says the wideband will 'autoconvert' or 'not care' about what fuel you're running and 11.5:1 on your wideband with pump or e85 will be what you want to see you'll just have to add more gas to achieve your desired AFR.
I currently shoot for 11.5:1 fuel ratio, if on e85 would I still want to read 11.5:1 on my wideband or something much lower? Just want to make sure I'm understanding this correctly. I think seeing 11.5:1 on my wideband is correct for pump gas, but when I put e85 in it, it may say 11.5:1 but the actual stoich ratio of e85 is in that 8.x range or whatever 'richer than stoich' would be for e85. So in other words, even though I see 11.5:1, the ACTUAL ratio of e85 is something much lower (where it should be for e85). I'd have to change my lambda settings to match e85 stoich ratios, but that isn't required (nor do I know if my wideband can do that).
So I think I should keep tuning for 11.5:1 to be shown on the wideband. Can someone confirm?
I currently shoot for 11.5:1 fuel ratio, if on e85 would I still want to read 11.5:1 on my wideband or something much lower? Just want to make sure I'm understanding this correctly. I think seeing 11.5:1 on my wideband is correct for pump gas, but when I put e85 in it, it may say 11.5:1 but the actual stoich ratio of e85 is in that 8.x range or whatever 'richer than stoich' would be for e85. So in other words, even though I see 11.5:1, the ACTUAL ratio of e85 is something much lower (where it should be for e85). I'd have to change my lambda settings to match e85 stoich ratios, but that isn't required (nor do I know if my wideband can do that).
So I think I should keep tuning for 11.5:1 to be shown on the wideband. Can someone confirm?
Last edited by gomba
on 2014-08-09
at 22-19-55.