Cooler Air == Running More Lean?
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TECH Resident
Joined: Jan 2002
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From: Phoenix, AZ
Cooler Air == Running More Lean? Just wondering . . . I was tuning a bit with the car yesterday to get the O2's above .900mv. The temps were around 70-75. This morning on the way to work I again logged a couple of WOT blasts, but now my sensors are reading ~.875. The only change was the air temps, this morning they were right around 50. Would this account for the difference?
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Re: Cooler Air == Running More Lean? [quote]Originally posted by MelloYellow:
<strong>.900 is still pretty lean.
I'd shoot for .930</strong><hr></blockquote>
You can't always assume the same A/F vs O2 for everybody. Sensors vary, location/temperature effects the numbers.
I run 885mv to 900mV, and that's wideband tuned for 12.2 to 11.8 A/F
Did your boost change at all w/ the lower temps?? I often see as much a 1 psi increase on a cold day. How much injector do you have? The denser air may be pushing them a little too hard <img src="gr_sad.gif" border="0">
[ February 13, 2002: Message edited by: y2khawk ]</p>
<strong>.900 is still pretty lean.
I'd shoot for .930</strong><hr></blockquote>
You can't always assume the same A/F vs O2 for everybody. Sensors vary, location/temperature effects the numbers.
I run 885mv to 900mV, and that's wideband tuned for 12.2 to 11.8 A/F
Did your boost change at all w/ the lower temps?? I often see as much a 1 psi increase on a cold day. How much injector do you have? The denser air may be pushing them a little too hard <img src="gr_sad.gif" border="0">
[ February 13, 2002: Message edited by: y2khawk ]</p>
Thread Starter
TECH Resident
Joined: Jan 2002
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From: Phoenix, AZ
Re: Cooler Air == Running More Lean? That's what I was thinking, Harlan. I emailed Dave about it. I'm pretty sure what's happening is that my *stock* injectors are already maxed out at 7psi. I get the extra fuel I need from the aux. injectors. Because of the denser air, if I had more injector the MAF would sense more air, and tell the PCM to dump in more fuel, but now it can't because they're maxed. I think I'm going to be stuck with this changing with weather ( at least above 5psi ) until I get bigger injectors. Do you know the max we can run without needing PCM programming? And can LS1-Edit correct for larger injectors?
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