? on wide band reading

[onefastgn]

What is a safe reading runnung E-85 with a wide band? I heard 11.1 to 11.9 is the sweet spot. Thanks

 

[northerngn]

What is a safe reading runnung E-85 with a wide band? I heard 11.1 to 11.9 is the sweet spot. Thanks

HELL NO

10.0 for light throttle cruising and idling
8.0 for power:biggrin:

-dan

 

[blackmonte]

10.8 =0 knock here

 

[TurboBuRick]

HELL NO

10.0 for light throttle cruising and idling
8.0 for power:biggrin:

-dan

Are you serious?

10.8 =0 knock here

+1 :biggrin:

 

[TurboK]

I run my car at 10.8 WOT AFR too. 26psi boost and no knock with 23 degrees timing.

 

[northerngn]

hmm maybe ill try leaning it up a bit
i was going off of the charts as laid out by F.A.S.T. as per the help section for XFI
check it out

ill try leaner but dont want to pop a h/g or burn a piston you guys running these arf's all the time?

 

[northerngn]

i see this as that 14.7 to 1 on gasoline and the same as 10.0 to 1 on e-85

now i know i wouldn't run 25 psi at 14.7 on gas so why would you do it at 10.0 which is the e-85 version of being that lean

just my opinion

hoping to learn more...:smile: let me know if i am wrong in thinking this way
seems to be working for you guys...:biggrin:

-dan

 

[northerngn]

OK! just got off the phone with Cal Hartline

So here it is
being that i am using XFI, i am able to adjust my fuel calculation parameters so that my w/b reads AFR for E-85

if i were to use a chip with say.. a standalone w/b set to read gas but was buring e-85 then the readings will be off as some of yours appear to be

thats where i got confused

in not saying your wrong...just realizing your getting reading from a w/b set up for gas not E-85

so sorry for any confusion to others or myself


Cal is the man!:biggrin:

so the answer the original question....
if your wide band is set up to read e-85
than 10.0 ish for cruising and light throttle
8.0 ish for max power
if you just have a w/b set up to read gas...well then...i dunno what to shoot for

-Dan

 

[grimreaper]

a wideband setup to read gas will display the readings in gas scale. Meaning cruise will still be 14.7 and wot will still be 10-11 or what ever the tune is. No matter what is burned, the af ratio will be in gasoline scale( if the WB is set to display that). o2 sensor reads just that, o2. It doesnt care what fuel is being burned.

 

[Turbo Loyd]

Air Fuel ratios not so straight forward

Yes, grimreaper and northerngn nailed it. You have to know the scale of the wide band sensor meter you are using. They all use oxygen content to calculate the air fuel ratio. XFI will allow switching from Gasoline's FEC constant, to other fuel's stoichiometric reading to show that fuel's relationship to lamda. Most others will not. Therefore you need a translation table to help understand the relationships

I have put a little table together that may be of use in using A/F meters calibrated to gasoline, when you are using E-70, E-85 and E-100 fuels.

To use the table, look at the A/F ratio you want in the column for the fuel using, then look at the A/F ratio for the calibration of the meter used in the same row. Hope it is of use.

Here is a sample:

Lamda . A/F Gas . A/F E‐70 . A/F E‐85 . A/F E‐100
1.027. . 15.1 . . . .10.89 . . . 10.03 . . . .9.25
1.014. . 14.9 . . . .10.74 . . . .9.90 . . . .9.13
1.000. . 14.700 . . 10.600 . . .9.765 . . .9.0078 Stoichiometric
0.986. . 14.5 . . . .10.46 . . . .9.63 . . . .8.89
0.973. . 14.3 . . . .10.31 . . . .9.50 . . . .8.76
0.959. . 14.1 . . . .10.17 . . . .9.37 . . . .8.64
0.946. . 13.9 . . . .10.02 . . . .9.23 . . . .8.52
0.932. . 13.7 . . . . 9.88 . . . . 9.10 . . . .8.40
0.918. . 13.5 . . . . 9.73 . . . . 8.97 . . . .8.27
0.905. . 13.3 . . . . 9.59 . . . . 8.84 . . . .8.15

Had to zip the file due to file size restrictions. Should be expanded