AFR

[Grey Silver]

My truck was dyno tuned w/ LS1 Edit. I'm running in open loop at 11.1/1 afr and I want to bring it to 11.8 or 12/1. What table do I use and how much do I change the values? Thanks in advance.

[GMPX]

In Edit or EFILive ?.
Are you running a MAF?.

Cheers,
Ross

[Grey Silver]

I'm using EFI live now. I had edit but never did the tuning myself. I'm still have a maf on the truck but I'm running in open loop. This is fine for now, I just want to play w/ the afr at the track at wot. I got the LC1 going last night and I'm running 11.1/1 at wot on motor.

Thanks,

John

[Grey Silver]

Ok, looks like I need to pull a little out of B3618. I'm thinking 5% and see what it does.

[Black02SS]

You are correct. You can change the units to display AFR instead of the Factor. This might help you dialing in the correct AFR.

[Bruce Melton]

You are correct. You can change the units to display AFR instead of the Factor. This might help you dialing in the correct AFR.
Really??

[Black02SS]

Open the Editor
Edit-> Properties--> Display

Here you can changes the units from a Factor to AFR.

[Bruce Melton]

I see that you can change the units to AFR but I guess it is the assumed AFR used to correct to, if that makes any sense? The PE correction factor is used to tailor fuel to achive a desired wideband or actual OL WB AFR as I use it.

It seems that it would be quite possible to tie in a commanded wideband AFR and have the correction factor added or subtracted and saved to be entered permenently. Well, not for me to do but---

[Black02SS]

I don't quite understand what you are describing but here is how it works. The program takes the factor and applies that to the Stoich AFR {B3601} in a calculation.

Stoich AFR / Factor = Displayed AFR

ie 14.63 / 1.13 = 12.95

Commanded is 14.63
Lets say your Actual AFR from a wideband is 13.5

You can back calculate from your actual and the difference between the two to re-adjust the VE/PE tables. (this only applies if your ve table is dialed in)

[joecar]

Are you talking about EQ ratio...?

EQ = (STOICH_AFR / AFR) = (1 / lambda)

Rich: EQ > 1.0
Lean: EQ < 1.0

[Grey Silver]

Open the Editor
Edit-> Properties--> Display

Here you can changes the units from a Factor to AFR.

Thanks, it makes a lot more sense to me now. Does this table have complete control of afr at wot?

[Black02SS]

If the car is in PE mode, it is based on the factor and the MAF table I do believe.

[caver]

Set the PE table to the AFR you want the engine to run at,then go to the B5001 table and move the table up or down till commanded=actual.

Bigger values runs richer and lower values run leaner. Work in small increments like 2% till you get it right.

This will work if your VE table is close if its far out then you will have to set that up.