ChevyNo1

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?

- Dug

MelloYellow

.900 is still pretty lean.

I'd shoot for .930

ChevyNo1

That's interesting . . . when I got my car wideband dynoed, my sensors were reading about .890 at 13:1 A/F . . .

- Dug

y2khawk

iTrader: (5)

[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>

ChevyNo1

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?

- Dug