View Full Version : AFR
Grey Silver
October 22nd, 2005, 05:39 PM
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
October 22nd, 2005, 06:03 PM
In Edit or EFILive ?.
Are you running a MAF?.
Cheers,
Ross
Grey Silver
October 23rd, 2005, 04:40 AM
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
October 25th, 2005, 05:58 PM
Ok, looks like I need to pull a little out of B3618. I'm thinking 5% and see what it does.
Black02SS
October 25th, 2005, 06:22 PM
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
October 26th, 2005, 06:36 AM
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
October 26th, 2005, 07:36 AM
Open the Editor
Edit-> Properties--> Display
Here you can changes the units from a Factor to AFR.
Bruce Melton
October 26th, 2005, 08:23 AM
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
October 26th, 2005, 08:45 AM
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
October 26th, 2005, 09:41 AM
Are you talking about EQ ratio...?
EQ = (STOICH_AFR / AFR) = (1 / lambda)
Rich: EQ > 1.0
Lean: EQ < 1.0
Grey Silver
October 26th, 2005, 06:36 PM
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
October 26th, 2005, 09:10 PM
If the car is in PE mode, it is based on the factor and the MAF table I do believe.
caver
October 28th, 2005, 03:07 AM
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.
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