TURBHOE

iTrader: (4)

i went to the track last weekend and in my data log i logged about 940mv's at wot on my narrow bands. i have wide band on the way if the guy will ever ship it. but i'm going on a dyno day saturday and would like to fix this before then if its really rich and killing power. i know 890 is "ideal" for narrow bands but they are not accurate. on a shift from 1st to 2nd it only drops to 4000rpm but it feels like a dog until 5000rpm where it picks back up.

monkey11

i read on here once that you wanted the o2s to be at ~915mv with longtube headers but thats just something i read. i'll try to find it ?

TURBHOE

iTrader: (4)

i thought there was a math equation to tell what /f ration that would be. and its 890mv for 13:1 afr.

ZL1Killa

iTrader: (17)

higher mV reading is leaner; lower mV reading is richer.

.1mV is rich
.9mV is lean

not saying bad or good rich or lean thats just a basic readout for ya.

also they say that about a .9 is a 13:1AFR or about a .890..... 6 one way half a dozen another..

get a wideband and see where she is really at, then make changes to AFR

TURBHOE

iTrader: (4)

thats weird because my ve table is at 100.5% and the pe was at 1.200. there is no way my **** flows that well to be lean with that. oh well i'll wait til i get my wide band i guess this makes no since to me at all.

SmokingWS6

iTrader: (1)

Higher the voltage = richer. lower = leaner.

Every narrow band can read different, altering factors can be exhaust temp, how hot the o2's are, age, wire extensions ect. You can get in the ballpark with narrowband o2's but its always best to properly calibrate your pe fueling with a Wideband.

Michael55123

iTrader: (3)

this is incorrect. .9 is rich, .1 is learn.

TURBHOE

iTrader: (4)

got a few sites for you. one
two three
i think that will do. but wide bands work the other way where higher voltage is leaner like you say but narrow bands the higher the voltage the richer. 1v being the richest and .001 leanest. i just spent like 4 hours reading on freaking o2 sensors to answer my on questions. and according to most the graphs 940 is really rich like 10.5 -11.5 IF the sensor was accurate.

cantdrv65

iTrader: (3)

.940 is rich like 11.5 :1 area. The narrowbands can be off quite a bit though.....

TURBHOE

iTrader: (4)

yeah i figured it out finally. funny thing is, is that i think that as high as my sensors can go. i pulled a ton of fuel out of the pe and still hit 940 so i'm pretty sure this is why my truck has been runing like a dog. i'm going to adjust the ve table a little. i remimber back on why i adjusted my ve table so high. when i first put the motor in the truck it screamed but i checked the plugs and they had a green tint to them and i was told that i was runing lean. so i fattened it up because i was gong on a trip to arkansas from maine and i didn't nee to blow up my motor. well my truck started to sem to get slow and i thought it was because of the arkansas heat. well i guess it wasn't its just been way rich all this time and killing my power.


if a person needs to run lets say 12.8:1 for max and is running 11:1-11.5:1 how much power could this take away. i'm being told that my truck should be running about 10 more mph in th 1/4 than it is (91mph now) could this be the most part of my problem could being this rich kill that much power? (in theory)

WAHUSKER

iTrader: (4)

940 would be a good number for forced induction....probably a bit much for NA. Adjust your PE (power enrich) table for WOT