Can engine run lean?
Thread Starter
Intermediate
Joined: Sep 2011
Posts: 43
Likes: 0
From: Williamsport Pa
Can engine run lean?
If you install headers, 102mm intake with throttle body is it possible for the motor to run too lean prior to getting it re tuned? The LS2 has already been tuned, I am just curious as to whether the on board fuel management system will absorb the difference of air coming in and going out and adjust for it. Are larger injectors recommended, say 50lb. for this setup, or not. An help or tips is much appreciated. Thank you.
Team Owner
Joined: Feb 2001
Posts: 27,254
Likes: 136
From: Short Hills, NJ
If you install headers, 102mm intake with throttle body is it possible for the motor to run too lean prior to getting it re tuned? The LS2 has already been tuned, I am just curious as to whether the on board fuel management system will absorb the difference of air coming in and going out and adjust for it. Are larger injectors recommended, say 50lb. for this setup, or not.
And no, you shouldn't need new injectors for just bolt on mods like that.
Drifting
Joined: Oct 2004
Posts: 1,790
Likes: 29
From: STL MO
St. Jude Donor '09-'10
^^Agreed^^
My tune was lean with just the addition of the 102 Fast, I already had long tubes and a tune when I installed it. Possibly worth noting, when I installed the 102 Fast intake i removed a ported LS2 intake.
My tune was lean with just the addition of the 102 Fast, I already had long tubes and a tune when I installed it. Possibly worth noting, when I installed the 102 Fast intake i removed a ported LS2 intake.
Le Mans Master
Joined: Jan 2009
Posts: 5,656
Likes: 112
From: ocean springs mississippi
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 26
From: Austin Texas
Since the computers control fuel and air it would be almost impossible to run lean enough to notice.
With more air the computer adds more fuel but the computer also controls the amount of air flow. Doesn't matter whether 90mm or 102mm TB, the computer controls how far the throttle opens and how much fuel flows.
With more air the computer adds more fuel but the computer also controls the amount of air flow. Doesn't matter whether 90mm or 102mm TB, the computer controls how far the throttle opens and how much fuel flows.
Burning Brakes
Joined: Nov 2008
Posts: 940
Likes: 1
From: Long Island NY
Since the computers control fuel and air it would be almost impossible to run lean enough to notice.
With more air the computer adds more fuel but the computer also controls the amount of air flow. Doesn't matter whether 90mm or 102mm TB, the computer controls how far the throttle opens and how much fuel flows.
With more air the computer adds more fuel but the computer also controls the amount of air flow. Doesn't matter whether 90mm or 102mm TB, the computer controls how far the throttle opens and how much fuel flows.
Safety Car
Joined: Nov 2007
Posts: 4,435
Likes: 874
From: Bay Area CA
Respectfully, not exactly. Sure the car is drive by wire but your right foot basically controls how much air enters the engine. You also have to consider open loop vs closed loop. Under part throttle in closed loop the O2 sensors will monitor the air fuel ratio and keep the mixture correct as long as the air coming in is within the parameters of the stock tuning. If you get to a point where more air is coming in than the tables are capable of handling, the car will run lean. At full throttle the car goes open loop where the O2 sensors are not used to monitor the air fuel ratio. It simply runs however it was calibrated by the engineers. If you add more airflow, and leave the stock tune alone, the mixture will be leaner at full throttle. If it goes too lean depends on how rich it was to begin with and how much air you have added.
Great explanation! In closed loop, once the engine runs too lean or too rich + or - 25% the ECM will throw codes. In open loop, there are no A/F ratio warnings!
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