So after some head scratching, digging and research I have determined that in 2004, 2005 GM skewed the NA vehicles with the following.
This only applies to Naturally Aspirated L26 equipped Grand Prixs.
I am searching for the reason behind this. My only guess is that they determined the volume of air to be different per cylinder and adjusted the fueling to match.
EDIT: Yes, Bio - good point, The rear manifold does infact flows better than front.
** would this mean more fuel required in the front to combat KR or less fuel since less flow ?
( i would guess more fuel)
Can we get a discussion going here?
I have never seen individual cylinder skewing from STOCK before.
I have confirmed with multiple 2004 and one 2005 GP stock bin files.
http://www.grandprixforums.net/lf-st...tml#post739989
When I got turbo, I will be definitely setting them all to 100% and then making adjustments based on plug readings and whatnot.
