Air Fuel
12-11-2008, 06:51 PM
#11
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
I had a bunch of people on here tell me that right around 12 was good on a naturally aspirated car. With my tuner saying 0% richer or leaner im at 12.8's but right now I have it at 2% leaner which puts me in around 12.2s at wot. So is that good. Ive noticed the exhaust isnt so strong or rich smelling with the 2% lean tune on. I know some of this info was from cliffyk and they all said that being on the rich side was better for more advanced timing. Just wanting to make sure my tune is right and im reading my air fuel gauge right thnx.
12.2:1 is richer than 12.8:1 --not leaner???
12-12-2008, 02:00 PM
#12
2nd Gear Member
Join Date: Jun 2007
Location: St. Louis Mo.
Posts: 235
Yeah I might of typed it in wrong cuz it was running a BIT rich and with it being leaned out its not. Il have to check it again but I think it was in the 11.8s stock. Now in the 12.2 being 2% lean. Where should it be at wot with the bolt ons listed??
12-12-2008, 03:29 PM
#13
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
Running n/a I prefer 12.0:1 to 12.5:1. Some will say 12.5:1 to 13.0:1, however I like to run a bit richer as it allows a bit more timing advance.
I have seen the stock tune run as rich as 11.0:1 to 11.5:1 as WOT, I suspect this was done deliberately to ensure there would be no detonation with the OEM 87 octane tune. On my 2003 the low and high fuel injector slopes were set as one would do for 19.5 #/h injectors, despita that the car has 21 #/h units.
Even derated for the 40 psi fuel pressure thay can stll move 20.25 #/h--in fact that's what I set the high slope to (with the low slope set 15% higher) and AFR at WOT went from 11.2:1 to 12.2:1.
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