Wot a/f ?
02-23-2010, 11:22 PM
#1
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Wot a/f ?
what are you guys running for wot a/f i got a wideband on today and went driving around and they seem a little low.
wot was around 11.0 to 11.5
wot spraying was 10.0 to 10.3
idle is 14.0 to 15.0
does this seem right or to lean?
also when i let out of the gas it goes past 20.0 .
wot was around 11.0 to 11.5
wot spraying was 10.0 to 10.3
idle is 14.0 to 15.0
does this seem right or to lean?
also when i let out of the gas it goes past 20.0 .
02-23-2010, 11:25 PM
#2
N/A should be around 12.8 or so at WOT from what I gather. As far as the N2O A/F goes, that is debatable. Some people say around 12.8-13.0, while others say richer (low 12s, high 11s).
Idle should be around 14.7 but will bounce around quite a bit, and going way lean for a second or two when you close the throttle after a run is normal.
Idle should be around 14.7 but will bounce around quite a bit, and going way lean for a second or two when you close the throttle after a run is normal.
Last edited by 00ChevyScott; 02-23-2010 at 11:51 PM.
02-23-2010, 11:33 PM
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ok so everything is off in my tune
so is it being so low hurting my performance or motor?
i guess i can up the fuel pill on the nitrous kit to get the 12.8 - 13.0 or so?
so is it being so low hurting my performance or motor?
i guess i can up the fuel pill on the nitrous kit to get the 12.8 - 13.0 or so?
02-23-2010, 11:37 PM
#4
I would see what is up with your tune and how consistent your numbers are with different weather conditions. What kind of wideband is it and where is it mounted?
Those numbers don't look to rich enough to hurt the motor, but it's definitely not burning efficiently and you're leaving some power on the table.
Those numbers don't look to rich enough to hurt the motor, but it's definitely not burning efficiently and you're leaving some power on the table.
02-23-2010, 11:45 PM
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id shoot for 15.0 for AFR at warm IDLE
WOT the truck will tell you want it likes best but 12.85 is good start
on the juice 12.6 id shoot for but plugs tell the true story here
WOT the truck will tell you want it likes best but 12.85 is good start
on the juice 12.6 id shoot for but plugs tell the true story here
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02-23-2010, 11:58 PM
#10
AFR = Air to Fuel Ratio, so 15 means a ratio of 15 parts air to 1 part fuel. Which also means 12.5 means 12.5 parts air to 1 part fuel, and since there is less air for the same amount of fuel, we call this richer. This works the other way so 17 AFR is leaner. Around 14.6 for gasoline is usually the point by which rich and lean are measured.
When it goes lean when you let off the throttle is because of DFCO (Dynamic fuel cutoff). The computer cuts fuel to the engine which saves gas and gives you an engine braking effect. There is no load on the engine so this doesnt hurt anything.
Richer is generally safer since more fuel cools the combustion chamber. All your numbers are fine.
When it goes lean when you let off the throttle is because of DFCO (Dynamic fuel cutoff). The computer cuts fuel to the engine which saves gas and gives you an engine braking effect. There is no load on the engine so this doesnt hurt anything.
Richer is generally safer since more fuel cools the combustion chamber. All your numbers are fine.