What does running lean mean? - Subaru WRX Forum
 
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post #1 of 6 Old 06-07-2004, 09:28 PM Thread Starter
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What does running lean mean?

What does runnin lean mean and how does one know if they have it?
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post #2 of 6 Old 06-07-2004, 11:10 PM
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Go to google and look it up. That's a term you are going to want to know as much as possible about. Especially when it comes to tuning.

Running lean basically means that your Air Fuel Ratio is off and there is more air than fuel, which creates a lean condition.

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post #3 of 6 Old 06-07-2004, 11:47 PM
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Quote:
Originally posted by BlueDemon
Go to google and look it up. That's a term you are going to want to know as much as possible about. Especially when it comes to tuning.

Running lean basically means that your Air Fuel Ratio is off and there is more air than fuel, which creates a lean condition.

Blue
Just to add to what Blue said more air vs fuel when compared to the "Stoichiometric" value (is that the correct word)

Basically too much air when compared to optimal air fuel mix

it's not a 50/50 mix
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post #4 of 6 Old 06-08-2004, 12:51 AM
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Stoich is 14.7 parts air to one part fuel, so yea... very far from a 50/50 mix.

FP Green'd 04 STi

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post #5 of 6 Old 06-08-2004, 01:27 AM
 
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Quote:
Originally posted by jwtarbaj
the "Stoichiometric" value
Hey Stoichiometry! I learned about this, this year in my sophmore Honors Chem class. Stoichiometry is used to find out how much of somethign will be produced when you have a certain amount of a reactant or vice versa. Sorry had to comment lol
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post #6 of 6 Old 06-08-2004, 05:46 AM
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Quote:
Originally posted by jwtarbaj


Just to add to what Blue said more air vs fuel when compared to the "Stoichiometric" value (is that the correct word)

Basically too much air when compared to optimal air fuel mix

it's not a 50/50 mix
yeah, what he said


Quote:
Originally posted by T WREX

Stoich is 14.7 parts air to one part fuel, so yea... very far from a 50/50 mix
What he said too!


Basically, what it all means in simple terms (what I like) is that when you have too much of one or the other (air or fuel) it's bad and bad things can happen. More so when it's running too lean. Know this though.... when one tunes a car, they are going for just the right amount of a "leaned" out fuel trim to give them the most amount of power with the least amount of risk of Detonation. However, when tuning on the safe side, one normally tunes to run ever so slightly rich. (more fuel "normally" means cooler EGTs).

Blue
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