leaning out mixture
#1
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leaning out mixture
in my reading of this forum ive read that our car runs rich. i have a NA s4 that i drive every day, 50-75 miles a day depending on the day, so i pay a lot of money for gas. i was wondering if anyone knew of a way to lean out the mixture, to help mileage as well as give a little more power, and my car is bone stock. i did a little searching but found nothing. any help is appriciated
#2
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The only way to alter the mixture is with a fuel computer. Either a piggyback like an S-AFC or a stand-alone EMS (big $.) Both have to be tuned after installation to be effective.
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#4
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If you do a lot of low-load, highway cruise type of driving, you are not going to get much better gas mileage.
The closed-loop O2 sensor system allows the engine to run at it's most efficient under those conditions.
-Ted
The closed-loop O2 sensor system allows the engine to run at it's most efficient under those conditions.
-Ted
#6
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i keep reading that horsepower could be gained by leaning out the mixture a little. but apparently that can only be done with an extra fuel computer?
#7
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Originally Posted by jediknight7
i keep reading that horsepower could be gained by leaning out the mixture a little. but apparently that can only be done with an extra fuel computer?
Yes.
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#9
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Originally Posted by jediknight7
i keep reading that horsepower could be gained by leaning out the mixture a little. but apparently that can only be done with an extra fuel computer?
#10
you can lean out the mixture without a computer. there is this little screw on top of a s4 n/a's thorttle body called the variable resistor that controls the mixture of fuel, it may be on the turbo model or the s5 but i haven't checked. I thought the renesis rx8 rotary doesn't neccessarily need more fuel. Most 18 wheelers and tractor trailers made today have relatively clear exhaust and inject less fuel, they get better gas milage than the old ones spewing black exhaust (unburnt fuel).
#11
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Originally Posted by NOPR
running lean isnt good for your engine in the long run, but thats your call.
Strike 1.
-Ted
#12
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Originally Posted by therotaryrocket
you can lean out the mixture without a computer. there is this little screw on top of a s4 n/a's thorttle body called the variable resistor that controls the mixture of fuel, it may be on the turbo model or the s5 but i haven't checked.
Strike 2.
-Ted
#14
I'm a boost creep...
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Originally Posted by jediknight7
im looking for a cheap/DIY way to lean it out. i barely have money for exhaust mods...
Originally Posted by NOPR
running lean isnt good for your engine in the long run, but thats your call.
#15
ok well if the variable resistor only affects idle it helps my friends rx7 because while he is delivering for his job he usually leaves the car idling.
strike 3000000000 fool, thats so whack
strike 3000000000 fool, thats so whack
#16
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Actually, most people, and even the factory recomend never to mess with the variable resistor. Its pretty risky, but then again its your car.
P.S. Im from IRAN TOO! Chetori?!
P.S. Im from IRAN TOO! Chetori?!
#17
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Originally Posted by therotaryrocket
ok well if the variable resistor only affects idle it helps my friends rx7 because while he is delivering for his job he usually leaves the car idling.
strike 3000000000 fool, thats so whack
strike 3000000000 fool, thats so whack
Strike 3.
GTFOOH.
-Ted
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