HELP: AFR too lean
#1
Registered User
Thread Starter
iTrader: (1)
Join Date: Nov 2006
Posts: 220
Likes: 0
Received 0 Likes
on
0 Posts
HELP: AFR too lean
Tried logging the data from O2S1 using OBDKey Bluetooth and here is what I got:
~mA~~~ EQ Ratio~~RPM
-0.121~~0.970~~~~1042
-0.027~~0.993~~~~1099
-0.238~~0.945~~~~1140
-0.215~~0.949~~~~1200
-0.051~~0.986~~~~1214
0.227~~1.097~~~~1241
0.113~~1.041~~~~1267
-0.188~~0.955~~~~1390
-0.102~~0.974~~~~1764
-0.098~~0.976~~~~2232
-0.152~~0.962~~~~2750
-0.414~~0.908~~~~3320
-0.727~~0.852~~~~3886
-0.316~~0.928~~~~4500
-0.504~~0.890~~~~5085
-0.363~~0.918~~~~5727
-0.512~~0.889~~~~6359
-0.535~~0.885~~~~6967
-0.820~~0.836~~~~7549
-0.543~~0.884~~~~8031
-0.418~~0.907~~~~8594
0.555~~~1.256~~~~8822
According to:
To convert EQ Ratio to AFR, use: AFR = {stoich}/EQ
To convert Lambda to AFR, use: AFR = Labmda/{stoich}
To convert AFR to EQ Ratio, use: EQ Ratio = {stoich}/AFR
To convert Lambda to EQ Ratio, use: EQ Ratio = 1/Lambda
To convert EQ Ratio to Lambda, use: Lambda = 1/EQ Ratio
I assume that the Stoich for RON97 petrol is 14.1 and apply "14.1/EQ Ratio". Is this equal to {14.1}/EQ Ratio? not sure what is the curly bracket means.
And my AFR looks way too lean.
~mA~~~ EQ Ratio~~RPM
-0.121~~0.970~~~~1042
-0.027~~0.993~~~~1099
-0.238~~0.945~~~~1140
-0.215~~0.949~~~~1200
-0.051~~0.986~~~~1214
0.227~~1.097~~~~1241
0.113~~1.041~~~~1267
-0.188~~0.955~~~~1390
-0.102~~0.974~~~~1764
-0.098~~0.976~~~~2232
-0.152~~0.962~~~~2750
-0.414~~0.908~~~~3320
-0.727~~0.852~~~~3886
-0.316~~0.928~~~~4500
-0.504~~0.890~~~~5085
-0.363~~0.918~~~~5727
-0.512~~0.889~~~~6359
-0.535~~0.885~~~~6967
-0.820~~0.836~~~~7549
-0.543~~0.884~~~~8031
-0.418~~0.907~~~~8594
0.555~~~1.256~~~~8822
According to:
To convert EQ Ratio to AFR, use: AFR = {stoich}/EQ
To convert Lambda to AFR, use: AFR = Labmda/{stoich}
To convert AFR to EQ Ratio, use: EQ Ratio = {stoich}/AFR
To convert Lambda to EQ Ratio, use: EQ Ratio = 1/Lambda
To convert EQ Ratio to Lambda, use: Lambda = 1/EQ Ratio
I assume that the Stoich for RON97 petrol is 14.1 and apply "14.1/EQ Ratio". Is this equal to {14.1}/EQ Ratio? not sure what is the curly bracket means.
And my AFR looks way too lean.
#3
Registered User
Thread Starter
iTrader: (1)
Join Date: Nov 2006
Posts: 220
Likes: 0
Received 0 Likes
on
0 Posts
If I used divide the EQ Ratio by 14.7 stoich, it's even leaner...
Maybe the reading of OBDKey from stock O2S1 is Lambda instead of EQ Ratio. Then it makes sense.
The 1st graph in my previous post was calculated with {Stoich}/EQ Ratio, which is 14.1/EQ Ratio.
The 2nd graph here is assuming that the reading from OBDKey of O2S1 is Lambda and calculated with Lambda*14.7. This is assuming that the data is in Lambda, and the AFR looks correct.
Maybe the reading of OBDKey from stock O2S1 is Lambda instead of EQ Ratio. Then it makes sense.
The 1st graph in my previous post was calculated with {Stoich}/EQ Ratio, which is 14.1/EQ Ratio.
The 2nd graph here is assuming that the reading from OBDKey of O2S1 is Lambda and calculated with Lambda*14.7. This is assuming that the data is in Lambda, and the AFR looks correct.
#4
Administrator
iTrader: (7)
OEM programming or are you running a custom map?
Thread
Thread Starter
Forum
Replies
Last Post
JimmyBlack
Series I Major Horsepower Upgrades
273
02-10-2020 10:23 PM
JantzenRX-8
RX-8 Parts For Sale/Wanted
1
10-04-2015 11:30 PM
dbarber
Series I Trouble Shooting
14
07-25-2015 01:34 PM