Correct fuel/air ratio?
Thread Starter
Intermediate
Joined: Feb 2005
Posts: 32
Likes: 0
Correct air/fuel ratio?
I got the results from a couple of dyno runs and the air/fuel ratio seems to be a lot richer than I would have guessed. It was measured between 10.5 and 11.8 rather than the 14.7 that I expected. I'm assuming that there would be some variation, but that seems a bit much. Is this normally what you would see on a dyno run at wide open throttle? This is a 1996 LT4 with minimal mods (shorty headers, B&B exhaust). Mucho Thanks!
Last edited by nearmiss; Feb 14, 2005 at 09:54 PM. Reason: inverted the ratio
Melting Slicks
Joined: Dec 2000
Posts: 2,719
Likes: 60
From: Fremont Oh
I would say normally aspirated you would want to be around 13.8 ish.. 14.7 is for cruise / idle.
Is your air filter clean? ~just checking~ at WOT it can somewhat effect it if its real dirty.
Hope thid helps
Mo
Is your air filter clean? ~just checking~ at WOT it can somewhat effect it if its real dirty.
Hope thid helps
Mo
Thread Starter
Intermediate
Joined: Feb 2005
Posts: 32
Likes: 0
Thanks, Mo. The air filter is a relatively new K&N. I was wondering if the oxygen sensors could be old/off. I've got around 80k miles on the car and I imagine that the sensors are that old, but I'm not sure since I'm probably the 3rd owner.
nearmiss
nearmiss
Melting Slicks
Joined: Dec 2000
Posts: 2,719
Likes: 60
From: Fremont Oh
I would say they are probably "ok" they shouldn't put you that rich... mine are originals too HEH
THe factory tends to program the cars pig rich to pass emissions. I would look to shoot for about 850 mv on the O2's.
do you have LT1 edit? ( It works with LT4's as well)
You could trim the fuel some...
Mo
THe factory tends to program the cars pig rich to pass emissions. I would look to shoot for about 850 mv on the O2's.
do you have LT1 edit? ( It works with LT4's as well)
You could trim the fuel some...
Mo
Burning Brakes
Joined: Apr 2002
Posts: 1,126
Likes: 0
From: Cleveland OH
Originally Posted by Mo_Bandy
I would say normally aspirated you would want to be around 13.8 ish.. 14.7 is for cruise / idle.
Ron
Safety Car
Joined: Sep 2000
Posts: 3,524
Likes: 4
From: Hinckley Ohio
Seems that 12.5 -12.75 is "safer" and you are still maximizing torque & power......you might get a little more at 13.1 but with a higher risk of troubles......this is for WOT
14.7 is for cruising looking for max economy & minimal pollution....in feedback loop using O2 sensors...
14.7 is for cruising looking for max economy & minimal pollution....in feedback loop using O2 sensors...
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