AFRs and Turbos

[oztracktuning]

What AFRs pre-cats are people aiming for when tuning Turbos LS1s?
What is a recommended curve for rpm and map ??

[turboberserker]

11.5 AFR under boost is what most guys aim for. I don't know many turbo guys who still run cats, and definitely don't know anyone running the wbo2 in front of the cats -- the pressure up there would kill the sensor in a hurry I'd think.

[kbracing96]

I shoot for around 11.5-11.8 with about 17-18* of timing on my 4.8. I'm geting a meth kit next week, so I will see if I can run a little more timing and some more boost as well.

I run my wideband in the rear of my truck, right after the turbo. Worked fine when I had the cats on there, and read the same, when I took them off other then the ajusting I had to do for the increase in flow. But the cats didn't apear to make any diffreace in the reading of the WB.

[caver]

The std sensors live just after the turbo on factory cars and they last just fine.her than
I personally run turbo cars between 12.5 and 12:1 I find that running richer than that loses power. Running like that with a little less advance is the same or better power wise than richer with more timing.
The richer mixtures also leaves lots of unburnt fuel pumping out of the exhaust

[DJ's99SS]

Would this be the same for us SC guys? I realize the tuning would be slightly diff from a Turbo set up but are most FI set ups looking for that same general number...?

[caver]

I use the same afr for turbo and sc. in vacuum same as na.