Reading AFR under 10 on wideband for e85?

[maxgee]

E85 AFR is 9.76, how are you reading and making adjustments for this fuel? I have a PLX wideband and only goes as low as 10 and high as 18

[S2H]

you are not reading ARF under 10
you are reading Lambda 1.0 for stoich
your wideband will show 14.7 at stoich for any fuel...

you can tune to e85 stoich and your WOT just the sane as gas without any changes except for bigger injectors....

your narrowbands will trim at stocih as well..

it doesnt matter if your wideband shows 14.7...for e85 14.7 = 9.76

[ls1x2]

Some widebands will let you specify which ranges are valid and I believe which value is stoich. I remember configuring my autometer this way. I am not running e85 though so it was already correct for me.

[maxgee]

thanks!

you are not reading ARF under 10
you are reading Lambda 1.0 for stoich
your wideband will show 14.7 at stoich for any fuel...

you can tune to e85 stoich and your WOT just the sane as gas without any changes except for bigger injectors....

your narrowbands will trim at stocih as well..

it doesnt matter if your wideband shows 14.7...for e85 14.7 = 9.76

[Super73]

Sorry to dig up an old thread but..

If I were shooting for 8.0 for E85 on a gas configured (14.7 Lambda) wideband, would I really be looking for 12.05 on the wideband?

Reason I ask is I'll be using my wideband as well as a dynojets wideband when I am on the dyno. Not sure I can reconfigure the dyno's WB. Stoich to Stoich seems to be 14.7 / 9.765 = 1.50xxx so I fiugure 8 * 1.5 = 12..


Thanks in advance.

[S2H]

if your wideband outputs voltage you can set it up anyway you want
just need to know the ARF range the unit is supposed to represent

lambda 1.0 on e85 = 9.765
a wideband will always read stoich as stoich...the output AFR comes from the multiplier in a formula...
so the wideband on the dyno will read 14.7 at stoich even if you are using e85
shoot for .85 lambda as a starting point for power...with e85 typically you can go quite a bit richer and still make power
and FYI... 14.7 x 0.85 = 12.5
so the dyno wideband will read 12.5 when you are at 8.3 AFR on e85

[mr.prick]

For WBO2's that don't have the option of changing the output
make a new PID expression to match your stoich AFR.

You're not stuck with the gasoline stoich/scale so why do conversions when you don't have to?