Setting efi live to display AFR units?

[SharpA]

Like the title says, Im beginning to setup my tune do do my first VVE tune, Im following the swingtans vve tutorial that's posted here on the forums..

Im down to where im setting the tune up before the drive, and in the writeup im getting these instructions

Parameter: B0141
Set all cells to 14.5 (assuming you have EFILive set to work in AFR)
Parameter: B0143
Set all cells to 14.5 (assuming you have EFILive set to work in AFR)

In my EFI live im showing units of Lambda? is this the same or no?

[Wheelz]

Lambda is AFR measured/desired divided by stoich AFR for your fuel. IIRC you'll set those values to 1.00

[darcy]

14.5 AFR is Lambda 0.99 (As Wheelz said: 14.5/14.68)
Don't try to command Lambda = 14.5. It simply won't run.

[joecar]

In the V7 tunetool, go Edit->options and set the Fueling units to AFR...


or better, set the Fueling units to EQR and convert the AFR's listed in post #1 to EQR (what fuel are you using...?).

[SharpA]

In the V7 tunetool, go Edit->options and set the Fueling units to AFR...


or better, set the Furling units to EQR and convert the AFR's listed in post #1 to EQR (what fuel are you using...?).

93 pump gas

[joecar]

93 pump gas has stoich AFR ranging from 14.4 to 14.7 depending on your location (which determines alcohol content)...

if you work in EQR or Lambda you can avoid this dependency.

[Wheelz]

I used to want to work in AFR till I sat down and finally figured out how EQR and lambda work. I'd never work in AFR now

[joecar]

Basically:


different fuels have different stoich AFR (e.g. E00 14.7, E10 14.2, E85 9.7);


Lambda, EQR, AFR are related to each other as follows:
Lambda = 1/EQR = AFR/stoich_AFR

or equivalently:
1/Lambda = EQR = stoich_AFR/AFR

(i.e. Lambda is proportional to AFR, EQR is inversely proportional).


Examples:

E00:
- stoich AFR is 14.7;
- CL: Lambda = 1; EQR = 1; AFR = 14.7;
- PE: Lambda = 0.858; EQR = 1.165; AFR = 12.6.

E10:
- stoich AFR is 14.2;
- CL: Lambda = 1; EQR = 1; AFR = 14.2;
- PE: Lambda = 0.858; EQR = 1.165; AFR = 12.2.

E85:
- stoich AFR is 9.7;
- CL: Lambda = 1; EQR = 1; AFR = 9.7;
- PE: Lambda = 0.858; EQR = 1.165; AFR = 8.3.


You can see that regardless of fuel being run, Lambda (or EQR) has the same value for PE, even tho the AFR are different;

i.e. you don't need to view the AFR, you just need to know what the suitable Lambda and/or EQR values are for the different conditions.

[mr.prick]

you can change the units displayed in the v7 tune.exe

edit> properties> display tab
commanded fuel values: display in:
lambda, eq or afr