Another_User

Why is there a difference in the Stoich AFR in 98s compared to other years? Mine has 14.62857, and every other year I have seen has 14.737. Does this make any kind of difference? Does anybody have an idea why GM did it? Would it hurt to set mine the same as the rest of them?

jimmyblue

iTrader: (11)

My 2002 stock tune has 14.62857.

NCal

FWIW, my '01 SS also has Stoich AFR set to 14.62857.

Nick

felton316

My '98 has 14.737 as the stoich value.

HumpinSS

iTrader: (1)

mine is 14.6 00 camaro

Another_User

Ok...so...why are they different? Any experts out there that can shed some light on this?

jimmyblue

iTrader: (11)

It's only a 0.7% difference; I reckon they just either
caught an "oops" or decided to shave on it for the
EPA. Who knows?

horist

my 00 was 14.737
my 02 now is: 14.62857

I'm guessing it has to do w/the region the car's sold in maybe? Like depending on if they use reformulated gas?

moehorsepower

iTrader: (3)

I have tuned well over 100 LT and LS-1 and the LS-1 values are very inconsistent. I have seen STOCK tunes that were very aggressive from the factory and others that were very mild, Why ?? Mass Producibility ?? Who Knows...

Another_User

Has anybody noticed if the O2 High and Low values are different on the ones with a different Stoich value?

deezel

My '03 truck PCM has 14.684 for stoich.

Edit does not have these... might not be much familiarity with them yet.

samz28

would someone here tell me how to make the car run a little CLOSED LOOP leaner by changing this table. I don't want to guess it (amount and direction).

say its setup for like 14.6:1 and i want it to run 14.8 (2% leaner).

Just an educated direction on how to tweak this parameter would be cool.